CN107619315A - A kind of high nitrogen water-soluble fertilizer of amino acid and preparation method thereof - Google Patents
A kind of high nitrogen water-soluble fertilizer of amino acid and preparation method thereof Download PDFInfo
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- CN107619315A CN107619315A CN201710194861.1A CN201710194861A CN107619315A CN 107619315 A CN107619315 A CN 107619315A CN 201710194861 A CN201710194861 A CN 201710194861A CN 107619315 A CN107619315 A CN 107619315A
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- amino acid
- acid
- metathesis reaction
- high nitrogen
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- 150000001413 amino acids Chemical class 0.000 title claims abstract description 51
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 28
- 239000003337 fertilizer Substances 0.000 title claims abstract description 20
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 14
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 239000007788 liquid Substances 0.000 claims abstract description 30
- 238000000034 method Methods 0.000 claims abstract description 21
- 238000005649 metathesis reaction Methods 0.000 claims abstract description 20
- 239000002699 waste material Substances 0.000 claims abstract description 16
- 230000004913 activation Effects 0.000 claims abstract description 4
- 238000006386 neutralization reaction Methods 0.000 claims abstract description 4
- 235000001014 amino acid Nutrition 0.000 claims description 47
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 15
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 15
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 12
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 10
- 239000004744 fabric Substances 0.000 claims description 10
- 238000001914 filtration Methods 0.000 claims description 10
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 9
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims description 8
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 7
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 claims description 6
- 229910000013 Ammonium bicarbonate Inorganic materials 0.000 claims description 6
- 235000012538 ammonium bicarbonate Nutrition 0.000 claims description 6
- 239000001099 ammonium carbonate Substances 0.000 claims description 6
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 claims description 6
- PAWQVTBBRAZDMG-UHFFFAOYSA-N 2-(3-bromo-2-fluorophenyl)acetic acid Chemical compound OC(=O)CC1=CC=CC(Br)=C1F PAWQVTBBRAZDMG-UHFFFAOYSA-N 0.000 claims description 5
- 238000001994 activation Methods 0.000 claims description 5
- 238000005119 centrifugation Methods 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 4
- 239000002253 acid Substances 0.000 claims description 4
- 235000019270 ammonium chloride Nutrition 0.000 claims description 4
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 4
- 239000004202 carbamide Substances 0.000 claims description 4
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 3
- 239000004480 active ingredient Substances 0.000 claims description 3
- 229910017604 nitric acid Inorganic materials 0.000 claims description 3
- CHKVPAROMQMJNQ-UHFFFAOYSA-M potassium bisulfate Chemical compound [K+].OS([O-])(=O)=O CHKVPAROMQMJNQ-UHFFFAOYSA-M 0.000 claims description 3
- 229910000343 potassium bisulfate Inorganic materials 0.000 claims description 3
- 239000004323 potassium nitrate Substances 0.000 claims description 3
- 235000010333 potassium nitrate Nutrition 0.000 claims description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims description 2
- 239000012295 chemical reaction liquid Substances 0.000 claims description 2
- YXVFQADLFFNVDS-UHFFFAOYSA-N diammonium citrate Chemical compound [NH4+].[NH4+].[O-]C(=O)CC(O)(C(=O)O)CC([O-])=O YXVFQADLFFNVDS-UHFFFAOYSA-N 0.000 claims description 2
- 238000009413 insulation Methods 0.000 claims description 2
- 230000000717 retained effect Effects 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims description 2
- 238000003756 stirring Methods 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 238000012805 post-processing Methods 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- WHUUTDBJXJRKMK-VKHMYHEASA-N L-glutamic acid Chemical compound OC(=O)[C@@H](N)CCC(O)=O WHUUTDBJXJRKMK-VKHMYHEASA-N 0.000 abstract description 4
- 229930195712 glutamate Natural products 0.000 abstract description 4
- 239000002689 soil Substances 0.000 abstract description 2
- 238000001514 detection method Methods 0.000 description 6
- 239000012530 fluid Substances 0.000 description 6
- 230000007935 neutral effect Effects 0.000 description 6
- 238000001556 precipitation Methods 0.000 description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 4
- 235000015165 citric acid Nutrition 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 239000000618 nitrogen fertilizer Substances 0.000 description 2
- 108010082495 Dietary Plant Proteins Proteins 0.000 description 1
- 102000011782 Keratins Human genes 0.000 description 1
- 108010076876 Keratins Proteins 0.000 description 1
- -1 MAP Chemical compound 0.000 description 1
- 235000010627 Phaseolus vulgaris Nutrition 0.000 description 1
- 244000046052 Phaseolus vulgaris Species 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000000205 computational method Methods 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- LPUQAYUQRXPFSQ-DFWYDOINSA-M monosodium L-glutamate Chemical compound [Na+].[O-]C(=O)[C@@H](N)CCC(O)=O LPUQAYUQRXPFSQ-DFWYDOINSA-M 0.000 description 1
- 235000013923 monosodium glutamate Nutrition 0.000 description 1
- 239000004223 monosodium glutamate Substances 0.000 description 1
- 235000018102 proteins Nutrition 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
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- Fertilizers (AREA)
Abstract
The invention discloses high nitrogen water-soluble fertilizer of a kind of amino acid and preparation method thereof, its technical matters includes:Pretreatment, activation, neutralization and the metathesis reaction of amino acid waste liquid.The high nitrogen water-soluble fertilizer of the present invention containing amino acid is made using the waste liquor of glutamate production, and product cost is low, and method is simple, has both efficiently solved the emission problem of waste liquor in glutamate production, has improved value-added content of product again.Crops nitrogen can be promoted to absorb after this technology products application, and improve soil physical chemistry architectural feature.
Description
Technical field
The present invention relates to high nitrogen water-soluble fertilizer of a kind of amino acid and preparation method thereof, belong to agricultural fertilizer field.
Background technology
Existing enterprise production amino acid fertilizer mostly be to prepare amino acid using acidolysis protein, as vegetable protein bean dregs,
Oil foot hair amino acid [application number caused by the concentrated sulfuric acid hydrolyzes:03111654.X] or hair in keratin through hydrochloric acid hydrolyze make
Take amino acid [application calls 01010183263.2] etc..Containing substantial amounts of in amino acid solution prepared by acidolysis utilized above
Acid, subsequently needs complex acid removal process, and financial cost is higher.
The present invention seeks to for producing monosodium glutamate waste liquor, pollute environment, the wasting of resources.It is of the invention then be using producing taste
The method that smart waste liquor prepares the high nitrogen water-soluble fertilizer of amino acid.The water solubility that a kind of method is simple, content is high, green is provided
Amino acid high nitrogen fertilizer material and preparation method thereof.
The content of the invention
A kind of high nitrogen water-soluble fertilizer of amino acid and preparation method thereof, its making step includes:
The pretreating process, the insoluble matter being separated off first using centrifugation or filter method in amino acid waste liquid, collect clear
Liquid.Separation method includes but is not limited to 3500~4000 rpm and centrifuged 8~10 minutes, 100~150 mesh filter-cloth filterings etc..
The activation method is:100~200 parts of amino acid clear liquid, addition phosphoric acid, MAP, nitric acid, ammonium nitrate, sulphur
One or more progress activation process in acid, potassium acid sulfate, acetic acid, citric acid, dibasic ammonium citrate, ammonium hydrogen carbonate are each effective
Composition addition is 5~30 parts, 25~30 DEG C of stir-activatings 1~3 hour.
The neutralization method is:One added into 100~200 parts of aminoacids solutions in potassium hydroxide, sodium hydroxide, ammoniacal liquor
Kind or several mixtures, total addition level are 20~50 parts, and the aminoacids solution pH after most activating at last is adjusted to 6.5~7.5.
Method according to claim 1, it is characterised in that its described metathesis reaction adds active ingredient with parts by weight
Meter, the mixture comprising one or more of:20~50 parts of potassium nitrate, 20~60 parts of ammonium nitrate, 30~80 parts of urea, phosphoric acid
30~65 parts of ammonium, 20~45 parts of ammonium chloride, 30~50 parts of ammonium hydrogen carbonate.Metathesis reaction treatment temperature is 20~90 DEG C, preferably
30~60 DEG C, stir to complete molten rear insulation 2~8 hours.
Method according to claim 1, it is characterised in that metathesis reaction liquid is cooled to 20~30 DEG C, with 100~
150 mesh filter-cloth filterings or 3000~4000 rpm centrifugations are post-processed, and are retained clear liquid, are obtained the high nitrogen Liquid Fertilizer of amino acid.
Product content computational methods, according to being titrated after the distillation of the measure of the determination of total nitrogen in compound fertilizer of GB/T8572~2010
Method detects.Acquired results are the product content.
Advantage of the invention is that using glutamate production waste liquor, it is prepared for that a kind of technique is simple, content is high, green
Water-soluble amino acids high nitrogen fertilizer material.Both the emission problem of waste liquor in glutamate production had been efficiently solved, has improved product again
Added value.Crops nitrogen can be promoted to absorb after this technology products application, and improve soil physical chemistry architectural feature.
Embodiment
Below by instantiation form, the present invention will be described in further detail, but the invention is not limited in this,
Every same as the present application or similar technical scheme belongs to present disclosure.
Embodiment 1
A kind of amino acid water-soluble fertilizer of the present invention and preparation method thereof comprises the following steps:
1)The parts by weight of amino acid waste liquid 100 are taken, 3000 rpm of pretreatment are centrifuged 5 minutes, obtain amino acid clear liquid;
2)The parts by weight of amino acid clear liquid 100, add 15 parts of phosphoric acid and carry out acidizing pretreatment;
3)Freamine Ⅲ is handled from the parts by weight of ammoniacal liquor 20 after acidifying, adjusts pH to 6.5~7.5;
4)The parts by weight of potassium nitrate 30 are added, the parts by weight of ammonium chloride 20, are added in above-mentioned neutral treatment fluid, carry out metathesis reaction;
5)Metathesis reaction temperature is 30 DEG C;
6)Stand, after being cooled to normal temperature, 100 mesh filter-cloth filterings, insoluble matter is less than 1 %.
Through content detection, products obtained therefrom content >=23g/L.
Embodiment 2
A kind of amino acid water-soluble fertilizer of the present invention and preparation method thereof comprises the following steps:
1)The parts by weight of amino acid waste liquid 100 are taken, 3000 rpm of pretreatment are centrifuged 5 minutes, obtain amino acid clear liquid;
2)The parts by weight of amino acid clear liquid 100, add 20 parts of phosphoric acid and carry out acidizing pretreatment;
3)Freamine Ⅲ is handled from the parts by weight of sodium hydroxide 20 after acidifying, adjusts pH to 6.5~7.5;
4)The parts by weight of ammonium hydrogen carbonate 45 are added, are added in above-mentioned neutral treatment fluid, carry out metathesis reaction;
5)Metathesis reaction temperature is 45 DEG C;
6)Stand, after being cooled to normal temperature, 100 mesh filter-cloth filterings, precipitation capacity is less than 1 %.
Through content detection, products obtained therefrom content >=24g/L.
Embodiment 3
A kind of amino acid water-soluble fertilizer of the present invention and preparation method thereof comprises the following steps:
1)The parts by weight of amino acid waste liquid 100 are taken, 3000 rpm of pretreatment are centrifuged 5 minutes, obtain amino acid clear liquid;
2)The parts by weight of amino acid clear liquid 100,10 parts of hydrochloric acid of addition, 20 parts of nitric acid carry out acidizing pretreatment;
3)Freamine Ⅲ is handled from the parts by weight of sodium hydroxide 20 after acidifying, adjusts pH to 6.5~7.5;
4)30 parts of urea, the parts by weight of ammonium nitrate 25 are added, are added in above-mentioned neutral treatment fluid, carry out metathesis reaction;
5)Metathesis reaction temperature is 50 DEG C;
6)Stand, after being cooled to normal temperature, 100 mesh filter-cloth filterings, precipitation capacity is less than 1 %.
Through content detection, products obtained therefrom content >=25g/L.
Embodiment 4
A kind of amino acid water-soluble fertilizer of the present invention and preparation method thereof comprises the following steps:
1)The parts by weight of amino acid waste liquid 100 are taken, 3000 rpm of pretreatment are centrifuged 5 minutes, obtain amino acid clear liquid;
2)The parts by weight of amino acid clear liquid 100, add 30 parts of acetic acid and carry out acidizing pretreatment;
3)Freamine Ⅲ is handled from the parts by weight of ammoniacal liquor 20 after acidifying, adjusts pH to 6.5~7.5;
4)30 parts of citric acid diamino is added, the parts by weight of ammonium chloride 25, is added in above-mentioned neutral treatment fluid, carries out metathesis reaction;
5)Metathesis reaction temperature is 50 DEG C;
6)Stand, after being cooled to normal temperature, 100 mesh filter-cloth filterings, precipitation capacity is less than 1 %.
Through content detection, products obtained therefrom content >=26g/L.
Embodiment 5
A kind of amino acid water-soluble fertilizer of the present invention and preparation method thereof comprises the following steps:
1)The parts by weight of amino acid waste liquid 100 are taken, 3000 rpm of pretreatment are centrifuged 5 minutes, obtain amino acid clear liquid;
2)The parts by weight of amino acid clear liquid 100,25 parts of phosphoric acid of addition, 5 parts of acetic acid carry out acidizing pretreatment;
3)Freamine Ⅲ is handled from the parts by weight of sodium hydroxide 50 after acidifying, adjusts pH to 6.5~7.5;
4)35 parts of ammonium hydrogencarbonate, the parts by weight of urea 30 are added, are added in above-mentioned neutral treatment fluid, carry out metathesis reaction;
5)Metathesis reaction temperature is 55 DEG C;
6)Stand, after being cooled to normal temperature, 100 mesh filter-cloth filterings, precipitation capacity is less than 1 %.
Through content detection, products obtained therefrom content >=22g/L.
Embodiment 6
A kind of amino acid water-soluble fertilizer of the present invention and preparation method thereof comprises the following steps:
1)The parts by weight of amino acid waste liquid 100 are taken, 3000 rpm of pretreatment are centrifuged 5 minutes, obtain amino acid clear liquid;
2)The parts by weight of amino acid clear liquid 100,10 parts of phosphoric acid of addition, 10 parts of citric acids carry out acidizing pretreatment;
3)Freamine Ⅲ is handled from the parts by weight of potassium hydroxide 30 after acidifying, adjusts pH to 6.5~7.5;
4)35 parts of MAP is added, the parts by weight of potassium acid sulfate 40, is added in above-mentioned neutral treatment fluid, carries out metathesis reaction;
5)Metathesis reaction temperature is 60 DEG C;
6)Stand, after being cooled to normal temperature, 100 mesh filter-cloth filterings, precipitation capacity is less than 1 %.
Through content detection, products obtained therefrom content >=28g/L.
Claims (6)
1. the present invention relates to high nitrogen water-soluble fertilizer of a kind of amino acid and preparation method thereof, it is characterised in that described high nitrogen Water soluble fertilizer
Preparation technology includes pretreatment, activation, neutralization and the metathesis reaction of amino acid waste liquid, and post processing.
2. method according to claim 1, it is characterised in that the pretreating process, first using centrifugation or filter method
The insoluble matter being separated off in amino acid waste liquid, collect clear liquid.Separation method includes but is not limited to 3500~4000 rpm centrifugations 8
~10 minutes, 100~150 mesh filter-cloth filterings etc..
3. method according to claim 1, it is characterised in that the activation method is:100~200 parts of amino acid clear liquid, adds
Phosphorate in acid, MAP, nitric acid, ammonium nitrate, sulfuric acid, potassium acid sulfate, acetic acid, citric acid, dibasic ammonium citrate, ammonium hydrogen carbonate
One or more carry out activation process, and each active ingredient addition is 5~30 parts, 25~30 DEG C of stir-activatings 1~3 hour.
4. method according to claim 1, being characterised by, the neutralization method is:Into 100~200 parts of aminoacids solutions
The one or more of mixtures added in potassium hydroxide, sodium hydroxide, ammoniacal liquor, total addition level are 20~50 parts, are most lived at last
Aminoacids solution pH after change is adjusted to 6.5~7.5.
5. method according to claim 1, it is characterised in that its described metathesis reaction adds active ingredient with parts by weight
Meter, the mixture comprising one or more of:20~50 parts of potassium nitrate, 20~60 parts of ammonium nitrate, 30~80 parts of urea, phosphoric acid
30~65 parts of ammonium, 20~45 parts of ammonium chloride, 30~50 parts of ammonium hydrogen carbonate.Metathesis reaction treatment temperature is 20~90 DEG C, preferably
30~60 DEG C, stir to complete molten rear insulation 2~8 hours.
6. method according to claim 1, it is characterised in that metathesis reaction liquid is cooled to 20~30 DEG C, with 100~150
Mesh filter-cloth filtering or 3000~4000 rpm centrifugations are post-processed, and are retained clear liquid, are obtained the high nitrogen Liquid Fertilizer of amino acid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710194861.1A CN107619315A (en) | 2017-03-29 | 2017-03-29 | A kind of high nitrogen water-soluble fertilizer of amino acid and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710194861.1A CN107619315A (en) | 2017-03-29 | 2017-03-29 | A kind of high nitrogen water-soluble fertilizer of amino acid and preparation method thereof |
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| Publication Number | Publication Date |
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| CN107619315A true CN107619315A (en) | 2018-01-23 |
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|---|---|---|---|
| CN201710194861.1A Pending CN107619315A (en) | 2017-03-29 | 2017-03-29 | A kind of high nitrogen water-soluble fertilizer of amino acid and preparation method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110172007A (en) * | 2019-07-12 | 2019-08-27 | 惠州护地农科有限公司 | A kind of water solubility refined organic fertilizer and its preparation process |
| CN110423148A (en) * | 2018-11-27 | 2019-11-08 | 湖北新洋丰肥业股份有限公司 | A method of amino acid Water soluble fertilizer is prepared using High-Mg phosphate tailings |
| CN111499444A (en) * | 2020-03-13 | 2020-08-07 | 广西壮族自治区农业科学院 | Preparation method and application of activated amino acid |
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| CN1121061A (en) * | 1994-10-16 | 1996-04-24 | 唐祯 | Proportioning and preparation process of liquid fertilizer containing amino acid |
| CN1136029A (en) * | 1994-05-17 | 1996-11-20 | 深圳宝安区科技开发公司 | Treatment of waste liquid of monosodium glutamate |
| EP1597199A1 (en) * | 2003-02-24 | 2005-11-23 | Washington University | THERAPEUTIC MALONIC ACID/ACETIC ACID C sb 60 /sb TRI-ADDUCTS OF BUCKMINSTERFULLERENE AND METHODS RELATED THERETO |
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| CN104987158A (en) * | 2015-07-19 | 2015-10-21 | 成都市朝森有机肥有限公司 | Ammonia-acid method composite fertilizer production technology |
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2017
- 2017-03-29 CN CN201710194861.1A patent/CN107619315A/en active Pending
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| CN1136029A (en) * | 1994-05-17 | 1996-11-20 | 深圳宝安区科技开发公司 | Treatment of waste liquid of monosodium glutamate |
| CN1121061A (en) * | 1994-10-16 | 1996-04-24 | 唐祯 | Proportioning and preparation process of liquid fertilizer containing amino acid |
| EP1597199A1 (en) * | 2003-02-24 | 2005-11-23 | Washington University | THERAPEUTIC MALONIC ACID/ACETIC ACID C sb 60 /sb TRI-ADDUCTS OF BUCKMINSTERFULLERENE AND METHODS RELATED THERETO |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110423148A (en) * | 2018-11-27 | 2019-11-08 | 湖北新洋丰肥业股份有限公司 | A method of amino acid Water soluble fertilizer is prepared using High-Mg phosphate tailings |
| CN110172007A (en) * | 2019-07-12 | 2019-08-27 | 惠州护地农科有限公司 | A kind of water solubility refined organic fertilizer and its preparation process |
| CN111499444A (en) * | 2020-03-13 | 2020-08-07 | 广西壮族自治区农业科学院 | Preparation method and application of activated amino acid |
| CN111499444B (en) * | 2020-03-13 | 2022-03-08 | 广西壮族自治区农业科学院 | Preparation method and application of activated amino acid |
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