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WO2020250137A1 - Procédé de préparation d'une composition d'engrais dispersible dans l'eau et compositions pulvérulentes fabriquées à partir de celle-ci - Google Patents

Procédé de préparation d'une composition d'engrais dispersible dans l'eau et compositions pulvérulentes fabriquées à partir de celle-ci Download PDF

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Publication number
WO2020250137A1
WO2020250137A1 PCT/IB2020/055435 IB2020055435W WO2020250137A1 WO 2020250137 A1 WO2020250137 A1 WO 2020250137A1 IB 2020055435 W IB2020055435 W IB 2020055435W WO 2020250137 A1 WO2020250137 A1 WO 2020250137A1
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Prior art keywords
composition
range
water dispersible
mixture
microns
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Ceased
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PCT/IB2020/055435
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English (en)
Inventor
OTHAYOTH Suresh PUTHIYAVEETIL
Nirmit Kantibhai SANCHAPARA
Ajay Bhanushankar JOSHI
Pujan Bhupendrabhai VAISHNAV
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Gujarat State Fertilizers And Chemicals Ltd
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Gujarat State Fertilizers And Chemicals Ltd
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Publication of WO2020250137A1 publication Critical patent/WO2020250137A1/fr
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
    • C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
    • C05G3/50—Surfactants; Emulsifiers
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05D—INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE
    • C05D9/00—Other inorganic fertilisers
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
    • C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
    • C05G3/70—Mixtures of one or more fertilisers with additives not having a specially fertilising activity for affecting wettability, e.g. drying agents
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
    • C05G5/00—Fertilisers characterised by their form
    • C05G5/10—Solid or semi-solid fertilisers, e.g. powders

Definitions

  • the present disclosure relates to a process for the preparation of a water dispersible fertilizer composition and compositions in powder form made there from.
  • Sulphur (S) is considered as an essential plant nutrient as it has a major influence on crop production in agriculture. Sulphur is absorbed by plants in the form of sulphates. Sulphates are released by volcanic eruption and fossil fuels, which are further deposited in the soil through rainwater. However, due to the efforts for clean air, fossil fuels are made free from sulphates, resulting in an overall reduction in the sulphate input to the soil and hence in the plants. Excessive cultivation also causes overconsumption of the Sulphur available in the soil. Sulphur deficiency causes serious defects in crop production volume and crop quality. The resulting deficiency of Sulphur in the plants necessitates its supplementation through addition of fertilizers to the soil.
  • sulphate Direct application of sulphate to the soil is less productive as it is highly soluble in water and gets leached away before being absorbed by the plants.
  • An alternative is to use elemental sulphur which is insoluble in water.
  • the insoluble elemental sulphur gets oxidized to form sulphates due to bacterial activity in the soil and is subsequently absorbed by the plants.
  • the sulphur particles should be in the size range of 15 to 40 microns. However, when the size of the particles is less than 25 microns, dispersion of the particles is not affected and is quick. Also, the uptake of the sulphur particles by the plants is not affected.
  • Micronizing elemental sulphur ensures large surface to volume ratio. However, if the particles are below 15 microns, the possibility of the particles getting washed away before oxidization is high, causing loss of the nutrient as well as contamination. Therefore, a balance has to be maintained between bacterial activity and loss of nutrient.
  • Indian Patent Number 282429 discloses an agricultural composition comprising sulphur ingredient.
  • the agricultural composition is in the form of water dispersible granules having a particle size in the range of 0.1 mm to 2.5 mm.
  • the granules further comprise sulphur particles having a size in the range of 2 microns to 12 microns.
  • the production method requires sulphur in a slurry form as a starting material.
  • An object of the present disclosure is to provide a process for the preparation of a water dispersible fertilizer composition containing micronized elemental sulphur.
  • Another object of the present disclosure is to provide a process for the preparation of a water dispersible fertilizer composition that is economical.
  • Still another object of the present disclosure is to provide a water dispersible fertilizer composition in the form of a powder.
  • Yet another object of the present disclosure is to provide a sulphur fertilizer composition that overcomes dissolution issues related to larger granular size when applied to soil directly.
  • the present disclosure relates to a process for preparation of a water dispersible fertilizer composition in the form of a powder.
  • the process comprises mixing sulphur prills with at least one filler material, at least one dispersing agent and at least one wetting agent, in a fluid medium, to obtain a first mixture.
  • the first mixture is aged, under continuous stirring, for a predetermined period of time.
  • a defoamer is added to the first mixture to obtain a second mixture.
  • the second mixture is then ground to obtain a wet ground mixture.
  • the wet ground mixture is dried at a predetermined temperature to obtain a final mixture.
  • the final mixture is sieved through at least one sieve to obtain the water dispersible fertilizer composition in the form of a powder, wherein the particle size of the water dispersible fertilizer composition is up to 90 microns.
  • the particle size of the composition is greater than 90 microns, there is a possibility of agglutination and non-dispersion.
  • the powder particles are greater than 90 microns, the dispersion of the particles in water is slower.
  • the particles remain undispersed there is a possibility of choking the nozzles of the drip irrigation. Therefore the mixture is sieved to ensure the particle size is up to 90 microns and the larger particles that remain in the sieve are returned to the first mixture.
  • the present disclosure further relates to a water dispersible fertilizer composition in the form of a powder prepared in accordance with the aforementioned process.
  • the water dispersible fertilizer composition in the form of a powder comprises micronized elemental Sulphur in an amount in the range of 90% to 93% of the total weight of the composition; at least one filler material in an amount in the range of 3% to 8% of the total weight of the composition; at least one dispersing agent in an amount in the range of 1% to 8% of the total weight of the composition; at least one wetting agent in an amount in the range of 0.1% to 2% of the total weight of the composition; and at least one defoamer in an amount in the range of 0.005% to 1% of the total weight of the composition, wherein the particle size of the water dispersible fertilizer composition in the form of a powder is below 90 microns; and wherein the particle size of the sulphur particles, when the water dispersible fertilizer composition is dispersed in water, is in the range of 15 micron
  • the suspensibility of the existing Sulphur particles is observed to be in the range of 40% to 45 %, however for the water dispersible fertilizer composition in the form of a powder in accordance with this disclosure it is in the range of 50% to 85%.
  • the moisture content of the water dispersible fertilizer composition in the form of a powder is in the range of 0.5% to 1% of the total weight of the composition.
  • Figure 1 illustrates the microscopic image of the Sulphur particles of the water dispersible fertilizer composition not containing defoamer
  • Figure 2 illustrates the microscopic image of the Sulphur particles of the water dispersible fertilizer composition in the form of powder prepared in accordance with the present disclosure
  • Figure 3a illustrates the photograph of groundnut crops after 60 days of field trials by using a commercially available fertilizer (NPK);
  • Figure 3b illustrates the photograph of groundnut crops after 60 days of field trials by using a mixture of commercially available fertilizer (NPK) and water dispersible fertili er composition in the form of powder in accordance with the present disclosure
  • Figure 3c illustrates the photograph of groundnut crops after 60 days of field trials by using a mixture of commercially available fertilizer (NPK) and water dispersible fertilizer in the form of granules.
  • NPK commercially available fertilizer
  • Figure 3c illustrates the photograph of groundnut crops after 60 days of field trials by using a mixture of commercially available fertilizer (NPK) and water dispersible fertilizer in the form of granules.
  • Embodiments are provided so as to thoroughly and fully convey the scope of the present disclosure to the person skilled in the art. Numerous details are set forth, relating to specific components, and methods, to provide a complete understanding of embodiments of the present disclosure. It will be apparent to the person skilled in the art that the details provided in the embodiments should not be construed to limit the scope of the present disclosure. In some embodiments, well-known processes, well-known apparatus structures, and well-known techniques are not described in detail.
  • first, second, third, etc. should not be construed to limit the scope of the present disclosure as the aforementioned ter s may be only used to distinguish one element, component, region, layer or section from another component, region, layer or section. Terms such as first, second, third etc., when used herein do not imply a specific sequence or order unless clearly suggested by the present disclosure.
  • a stable dispersion wherein the dispersed phase maintains a consistent particle size over time and remains in suspension, is another requirement for the oxidation to occur in the required time frame.
  • An advantage of the smaller particle size of the sulphur particles is the fast oxidation for plant absorption. However, the smaller the particle size is, the larger the chances of leaching loss and removal from the vicinity of the plants. Hence an optimum particle size of sulphur is essential for its effectiveness as a fertilizer when applied to soil.
  • Other conventional methods use a bead mill to grind powdered sulphur, which is mixed with various dispersing agents as well as wetting agents to get the sulphur in a dispersible form. However, the method is highly energy consuming and also requires high set up cost.
  • the present disclosure envisages a process for preparation of a water dispersible fertili er composition in the form of a powder and a water dispersible fertilizer composition in the form of a powder made there from.
  • a process for preparation of a water dispersible fertilizer composition in the form of a powder comprises the following steps:
  • particle size of the water dispersible fertilizer composition is up to 90 microns.
  • the particle size of the water dispersible fertilizer composition is maintained up to 90 microns to mitigate the possibility of agglutination and non-dispersion.
  • the powder particles are greater than 90 microns, the dispersion of the particles in water is slower.
  • the mixture is sieved to ensure the particle size is up to 90 microns and the larger particles that remain in the sieve are returned to the first mixture.
  • Mixing Means Any equipment suitable for mixing the material to obtain a uniform mixed mixture.
  • the mixing means referred herein may be a device for mixing of dry or wet or liquid mixture.
  • the material may be a mixture of two or more materials.
  • the grinding means referred herein may be a device for dry or wet grinding.
  • the material may be a mixture of two or more materials.
  • the mixing step and the aging step is carried out in a tank/hopper of a slotted rotor - slotted stator colloidal mill.
  • the mixing step is carried out at a first predetermined speed, preferably 300 rpm.
  • the first mixture is aged for a period of five hours.
  • the grinding step is carried out using the slotted rotor-slotted stator colloidal mill running at a speed of about 700 rpm.
  • a defoamer is slowly added until the bubbles disappear.
  • the defoamer cannot be added to the first mixture initially.
  • the defoamer only acts when the micro-bubble formation starts. This can happen during the mixing step when the mill is rotated at about 300 rpm but more so during the grinding step. Therefore, advantageously, the defoamer should be added immediately after commencement of the grinding step when the micro-bubbles are seen.
  • the grinding step is carried out for a duration in the range of 30 minutes to 120 minutes.
  • the grinding step is carried out at a second predetermined speed, preferably 700 rpm.
  • the ground mixture can be introduced to a spray dryer equipped with an atomizer and co current hot air flow.
  • Contact air temperature at the point of introduction of the ground mixture through the atomizer can be kept in the range of 110°C to 130°C.
  • Negative pressure can be maintained inside the spray dryer to ensure intimate contact of the hot air with the atomized sulphur particles to avoid melting.
  • the temperature in the spray dryer can be maintained in the range of 70 to 90 °C in order to ensure complete removal of the fluid medium as well as to prevent steam deposition on the final product.
  • the drying is carried out using conventionally known spray drying equipment.
  • the drying is carried out at a temperature in the range of 70°C to 130°C.
  • the drying is carried out at a temperature of 120°C.
  • the sieving step is carried out using a vibrating sieve.
  • the sulphur prills have a particle size in the range of 1 mm to 10 mm.
  • the sulphur prills are reduced to a particle size of 5 mm.
  • the filler material is used for the purpose of long term stabilization, bulking up the composition, reducing viscosity, increasing the solubility and improving the suspensibility of the water dispersible fertilizer composition.
  • the filler material is selected from the group consisting of bentonite clay, kaolinite and zeolite.
  • the filler material is bentonite clay.
  • the dispersing agent facilitates the separation of the particles of the composition and prevents settling and/or clumping of the composition.
  • the dispersing agent can be a single dispersing agent or a mixture of two or more dispersing agents in a predetermined ratio.
  • the dispersing agent is selected from the group consisting of a copolymer of benzylmethacrylate, a copolymer of acrylic acid, a copolymer of 2-acrylamido-2-methyl propane sulfonic acid, a water soluble nanofibrilated cellulose, a cellulose derivatives, a co-polymer of styrene and a methacrylate and a alkene naphthalene sulphonate.
  • the dispersing agent is a co-polymer of styrene and methacrylate.
  • the dispersing agent is a mixture of:
  • Sulphur as such is not wettable in water. In order to wet-grind sulphur, it needs to be made wet; hence addition of a wetting agent is necessary.
  • the wetting agent by using hydrophilic and hydrophobic parts of its chemical structure, promotes spreading of the water on the surface of the sulphur prills by reducing the surface tension between the water and the sulphur prills.
  • the wetting agent is selected from the group consisting of alpha olefin sulphonate, sodium salt of alkene (C12-C14) hydroxyl sulphonic acid, alkenesulphonic acid and derivatives of alkene sulphonic acid.
  • the wetting agent is alpha olefin sulphonate.
  • the aging step is important since the filler used, for e.g., bentonite clay, has a swelling property. It can absorb water and can swell up to 40 % of its initial volume. In the initial mix when bentonite is used as the filler material, the aging step is included so that the bentonite is completely swollen. This will increase grindability and homogeneity of the mixture. Since the aging process includes continuous stirring also, proper mixing of ingredients with swollen bentonite also occurs. The swollen bentonite can be fine ground better.
  • the filler used for e.g., bentonite clay
  • the aging step is included so that the bentonite is completely swollen. This will increase grindability and homogeneity of the mixture. Since the aging process includes continuous stirring also, proper mixing of ingredients with swollen bentonite also occurs. The swollen bentonite can be fine ground better.
  • Dry grinding of sulphur poses hazards of fire as well as creation of dust. Though the flash point of sulphur is 207°C, when dry ground, sulphur powder can catch fire at approximately 190°C. Development of static charges during dry grinding of sulphur also may lead to self ignition. Hence a suitable fluid medium is used while grinding sulphur.
  • the ratio of the sulphur prills to the fluid medium is in the range of 1 :0.1 to 1 :2.
  • the fluid medium is water.
  • a defoamer prevents the formation of foam/bubbles during the process of wet grinding.
  • the micro-bubbles if formed, create a fluffy material with very low density which results in a considerable increase in the volume of the material being ground, causing incomplete mixing and grinding.
  • the formation of fluffy material with very low density will also lead to the requirement of large volume mixing vessels and storage vessels, thereby reducing the throughput of the process.
  • Addition of the defoamer prevents the formation of bubbles during the grinding process. Hence, the volume and the density remain the same throughout the grinding process resulting in better mixing and grinding during the wet grinding process.
  • Addition of the defoamer is also advantageous during the end use of the water dispersible fertilizer composition in the form of a powder.
  • the presence of the defoamer prevents foam formation at the time of dispersion of the water dispersible fertilizer composition in water at the time of application. This will help for easy application and uniform distribution of the composition in the field.
  • the defoamer is selected from the group consisting of silicone based defoamer, silicone polymeric defoamer, dioxosilane, amorphous silica, hydrolyzed silica, poly(dimethylsiloxane), poly (ethylene oxide)block copolymer, poly[dimethylsiloxane-co-ethyl(3-hydroxypropyl)siloxane] - graft - poly (ethylene glycol) methyl ether, silicone glycol block copolymer and emulsified silicone oil.
  • the defoamer is a silicone polymeric defoamer.
  • the particle size of the water dispersible fertilizer composition in the form of a powder is kept below 90 microns.
  • the particle size of the water dispersible fertilizer composition in the form of a powder is 90 microns and below, with a majority of the particles having a particle size of 80 microns or less.
  • a water dispersible fertilizer composition in the form of a powder prepared in accordance with the aforementioned process, the composition comprising:
  • micronized elemental sulphur in an amount in the range of 90% to 93% of the total weight of the composition; 2. at least one filler material in an amount in the range of 3% to 8% of the total weight of the composition;
  • At least one defoamer in an amount in the range of 0.005% to 1% of the total weight of the composition
  • particle size of the water dispersible fertilizer composition in the form of a powder is up to 90 microns
  • particle size of the sulphur particles when the water dispersible fertilizer composition is dispersed in water, is in the range of 15 microns to 25 microns.
  • the suspensibility of the water dispersible fertilizer composition in the form of a powder is in the range of 50% to 85%.
  • the moisture content of the water dispersible fertilizer composition in the form of a powder is in the range of up to 0.5% to 1 % of the total weight of the composition.
  • the filler material is selected from the group consisting of bentonite clay, kaolinite and zeolite.
  • the filler material is bentonite clay.
  • the dispersing agents helps the sulphur particles to remain dispersed in water, even though the size of the sulphur particles is above 14 microns.
  • the dispersing agent may be a single dispersing agent or a combination of two or more dispersing agents in a predetermined ratio.
  • the dispersing agent is selected from the group consisting of copolymer of benzylmethacrylate, copolymer of acrylic acid, copolymer of 2-acryIamido-2-methyI propane sulfonic acid, water soluble nanofibrilated cellulose, cellulose derivatives, co-polymer of styrene and methacrylate and alkene naphthalene sulphonate.
  • the dispersing agent is a co-polymer of styrene and methacrylate. In accordance with a second exemplary embodiment of the present disclosure, the dispersing agent is a mixture of:
  • the wetting agent is selected from the group consisting of alpha olefin sulphonate, sodium salt of alkene (C 12 -C 14 ) hydroxyl sulphonic acid, alkenesulphonic acid and derivatives of alkene sulphonic acid.
  • the wetting agent is alpha olefin sulphonate.
  • the defoamer is selected from the group consisting of silicone based defoamer, silicone polymeric defoamer, dioxosilane, amorphous silica, hydrolyzed silica, poly(dimethylsiloxane), poly (ethylene oxide)block copolymer, poly[dimethylsiloxane-co-ethyl(3-hydroxypropyl)siloxane] - graft - poly (ethylene glycol) methyl ether, silicone glycol block copolymer and emulsified silicone oil.
  • the defoamer is a silicone polymeric defoamer.
  • the particle size of the water dispersible fertilizer composition in the form of a powder is up to 90 microns, with a majority of the particles having a particle size of 80 microns or less.
  • the suspensibility of the water dispersible fertilizer composition in the form of a powder is in the range of 50% to 85%.
  • the suspensibility of the water dispersible fertili er composition in the form of a powder is greater than 50% and up to 85%.
  • the moisture content of the water dispersible fertilizer composition in the form of a powder is in the range of 0.5% to 1% of the total weight of the composition.
  • the moisture content of the water dispersible fertilizer composition in the form of a powder is 1% of the total weight of the composition. 1 % is the maximum value and it can be any number below 1 %
  • the process of the present disclosure is simple, efficient, economical and less time consuming.
  • the higher moisture content helps overcome processing limitations associated with drying of powders such as dusting and material loss.
  • the water dispersible fertilizer composition in the form of a powder of the present disclosure contains micronized sulphur which oxidizes faster and has better dispersibility as compared to bulk sulphur powder or sulphur granules.
  • the water dispersible fertilizer composition in the form of a powder is dispersed in water at the time of application and applied to a plant, a locus of a plant or a part of a plant.
  • the water dispersible fertilizer composition in the form of a powder can also be applied directly to the soil, where it uses the water content of the soil to form a dispersion.
  • the wet ground mixture collected after grinding was then fed to a spray dryer at 120 °C drying chamber temperature at the contact point and 75 °C temperature at chamber exit to obtain the final mixture in the form of a powder.
  • the final mixture was sieved through a 90 micron sieve to obtain the water dispersible fertilizer composition in the form of a powder and the particles having a particle size above 90 microns were returned to the step of preparation of the first mixture.
  • the 7 L hopper was filled with bubbles, although milling was continued. Flow rate of the mixture being ground reduced as micro-bubbling increased. After 1 hour, the ground material was collected from the mill through the outlet into a container and then fed to a spray chamber where the flash - contact temperature was kept at 120°C. Dried material was collected and analyzed for moisture, elemental sulphur content and suspensibility. The dried product was made into a suspension in 1:500 solid to water proportion. The suspension prepared exhibited bubbles on the top, making it difficult to handle. The images of the sulphur particles were recorded on a microscope and it was seen that the particle size of the sulphur particles was above 25 microns ( Figure 1).
  • the absence of a defoamer (as in comparative example 2) has a detrimental effect on the particle size of the sulphur particles, when the water dispersible fertilizer composition was dispersed in water.
  • the particle size of the sulphur particles when the composition prepared in accordance with comparative example 2 was dispersed in water, is 26.52 microns.
  • the particle size of the sulphur particles when the composition was prepared in accordance with example 2 and is dispersed in water, is on an average between 17.76 microns and 20.84 microns.
  • Comparative Example 3 In a laboratory scale slotted rotor - slotted stator mill, 100 ml water was added followed by 182g sulphur prills of size 5 mm. 15 g of a mix of dispersing agents (Tersperse 2700 and Tersperse 2020) was then added to the mill followed by 3g wetting agent (Terwet 1004) to form a mixture. No filler was added to this mixture. This mixture was treated in accordance with the treatment given to the first mixture in Examples 1 & 2 in terms of blending, aging and grinding. O. lg of defoamer was added slowly to see that all the foam formed disappeared. The mixture was ground for 30 minutes to obtain a smooth free flowing composition, which was then transferred to a tray - dryer kept at 80°C overnight to obtain a water dispersible fertilizer composition in the form of a powder. The composition after drying was collected for analysis.
  • compositions prepared in accordance with Example 2, Comparative Example 2 and Comparative Example 3 were drawn and analyzed for the sulphur content, moisture content and suspensibility.
  • Suspensibility A procedure detailed in IS: 6940 - 1982 was followed to determine suspensibility of water dispersible fertilizer composition. A weighed sample aliquot was made into a suspension in standard hard water in a graduated measuring cylinder and kept steady for 30 minutes. After 30 minutes, 90 % of the total volume of suspension was removed without disturbing the portion below 90 % volume. The left out 10 % volume material was then dried and weighed. The ratio of the weight of the material that remained in the suspension to the weight of the material that settled down was expressed as suspensibility.
  • This characterization shows that the filler is essential to maintain the suspensibility greater than 80%.
  • the suspensibility parameter has an indirect correlation to dispersibility.
  • the water dispersible fertilizer composition in the form of a powder was applied on the summer groundnut plant of GG-2 variety in the plot size of 12 m .
  • the spacing of the plant was chosen to be 60 by 10 cm.
  • the experimental design chosen was randomized block design (RBD). Measurements were averaged over 3 replications (R-I, R-II, R-III).
  • Treatment 1 (Tl): Commercially available fertilizer (NPK)
  • Treatment 2 (T2): Commercially available fertilizer (NPK) and a water dispersible fertilizer composition in the form of a powder in accordance with the present disclosure.
  • Treatment 3 (T3): Commercially available fertilizer (NPK) and water dispersible sulphur granules.
  • Tables 2-5 show that the treatment with the mixture of commercially available fertilizer (NPK) and the water dispersible fertilizer composition in the form of a powder in accordance with the present disclosure indicates good response towards vegetative growth and yield attributing characters as compared to other treatments (commercially available fertilizer (NPK) alone and combination of commercially available fertilizer (NPK) with water dispersible sulphur granules)
  • Table 6 shows that the treatment with the mixture of commercially available fertilizer (NPK) and water dispersible fertilizer composition in the form of a powder in accordance with the present disclosure yields crops with better oil content as compared to other treatments(commercially available fertilizer (NPK) alone and combination of commercially available fertilizer (NPK) with water dispersible sulphur granules).
  • figures 3a, 3b and 3c show that treatment with a mixture of commercially available fertilizer (NPK) and water dispersible fertili er composition in accordance with the present disclosure shows better result as compared to other treatments(commercially available fertilizer (NPK) alone and combination of commercially available fertilizer (NPK) with water dispersible sulphur granules).
  • NPK commercially available fertilizer
  • NPK water dispersible fertili er
  • the water dispersible fertilizer composition in the form of a powder, in accordance with the present disclosure, was applied on the mustard plant.
  • the comparative study was carried out by using following 3 treatments to the above mentioned mustard plants:
  • Treatment 1 (Tl): Recommended Dose of Fertili er (RDF) comprising Urea & DAP + powder in accordance with the present disclosure
  • T2 Recommended Dose of Fertilizer (RDF) + Commercially Available Sulphur Granules
  • T3 Recommended Dose of Fertilizer (RDF)
  • Tl, T2 and T3 were applied to the mustard plant and the yield was recorded.
  • the products (Tl, T2 and T3) were applied to the leaves just before flowering through a spray using a handheld pressurized pump.
  • the products were made into suspensions in the tank of the pump along with water in a 1:10 ratio.
  • Tl no bubbling occurred during the preparation of the suspension.
  • no choking or settling of particles occurred until the completion of application of T1 as well.
  • bubbling, choking and settling occurred in the case of T2.
  • the yield of the mustard plant was recorded and is tabulated in table 7.
  • a water dispersible fertilizer composition in the form of a powder having faster and smooth dispersion in water for optimal absorption by plants, with higher yields and faster rate of growth of the plants.
  • a water dispersible fertilizer composition in the form of a powder, wherein the particle size of the sulphur particles, when the composition is dispersed in water, is in the range of 15 microns to 25 microns.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Pest Control & Pesticides (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Fertilizers (AREA)

Abstract

La présente invention concerne un procédé de préparation d'une composition d'engrais dispersible dans l'eau sous la forme d'une poudre. Le procédé de la présente invention est simple, efficace, économique, moins chronophage et son échelle est facile à augmenter. La présente invention concerne en outre une composition d'engrais dispersible dans l'eau sous la forme d'une poudre qui contient du soufre élémentaire micronisé. Le soufre élémentaire micronisé s'oxyde plus rapidement et présente une meilleure dispersibilité par rapport à la poudre de soufre en vrac. La taille des particules de la composition d'engrais dispersible dans l'eau sous la forme d'une poudre est inférieure à 90 microns. En outre, la taille de particule des particules de soufre, lorsque la composition d'engrais dispersible dans l'eau est dispersée dans l'eau, est comprise entre 15 microns et 25 microns. La composition d'engrais dispersible dans l'eau sous la forme d'une poudre fournit une dispersion stable.
PCT/IB2020/055435 2019-06-12 2020-06-10 Procédé de préparation d'une composition d'engrais dispersible dans l'eau et compositions pulvérulentes fabriquées à partir de celle-ci Ceased WO2020250137A1 (fr)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990003350A1 (fr) * 1988-09-30 1990-04-05 F.P.S. Italiana - Finances Products Services S.R.L. Amendement de sol chimique a base de soufre sous forme de pastilles, utilise dans l'agriculture
GB2292140A (en) * 1994-08-13 1996-02-14 Hays Chem Distr Ltd Application of sulphur or metals in agriculture
US5599373A (en) * 1988-09-30 1997-02-04 F.P.S.- Finances Products Services, S.R.L. Sulfur-based chemical soil-corrective in the form of pellets for agricultural use
WO2010118532A1 (fr) * 2009-04-16 2010-10-21 Sulphur Solutions Inc. Pastilles dispersibles d'engrais soufré
WO2019102359A1 (fr) * 2017-11-22 2019-05-31 Reliance Industries Limited Composition d'engrais à base de soufre dispersible dans l'eau et processus pour sa préparation

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990003350A1 (fr) * 1988-09-30 1990-04-05 F.P.S. Italiana - Finances Products Services S.R.L. Amendement de sol chimique a base de soufre sous forme de pastilles, utilise dans l'agriculture
US5599373A (en) * 1988-09-30 1997-02-04 F.P.S.- Finances Products Services, S.R.L. Sulfur-based chemical soil-corrective in the form of pellets for agricultural use
GB2292140A (en) * 1994-08-13 1996-02-14 Hays Chem Distr Ltd Application of sulphur or metals in agriculture
WO2010118532A1 (fr) * 2009-04-16 2010-10-21 Sulphur Solutions Inc. Pastilles dispersibles d'engrais soufré
WO2019102359A1 (fr) * 2017-11-22 2019-05-31 Reliance Industries Limited Composition d'engrais à base de soufre dispersible dans l'eau et processus pour sa préparation

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