CA2009731A1 - Process for the production of an absorption mass for carbon dioxide - Google Patents
Process for the production of an absorption mass for carbon dioxideInfo
- Publication number
- CA2009731A1 CA2009731A1 CA 2009731 CA2009731A CA2009731A1 CA 2009731 A1 CA2009731 A1 CA 2009731A1 CA 2009731 CA2009731 CA 2009731 CA 2009731 A CA2009731 A CA 2009731A CA 2009731 A1 CA2009731 A1 CA 2009731A1
- Authority
- CA
- Canada
- Prior art keywords
- hydroxide
- calcium
- solution
- alkali hydroxide
- carbon dioxide
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 238000000034 method Methods 0.000 title claims abstract description 27
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 20
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 12
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 8
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 6
- 238000010521 absorption reaction Methods 0.000 title description 4
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims abstract description 25
- 239000000920 calcium hydroxide Substances 0.000 claims abstract description 24
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims abstract description 24
- 229910001854 alkali hydroxide Inorganic materials 0.000 claims abstract description 17
- 150000008044 alkali metal hydroxides Chemical class 0.000 claims abstract description 17
- 159000000007 calcium salts Chemical class 0.000 claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 7
- 239000007864 aqueous solution Substances 0.000 claims abstract description 6
- 239000011358 absorbing material Substances 0.000 claims abstract description 5
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical group [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 13
- 238000001556 precipitation Methods 0.000 claims description 12
- 239000000243 solution Substances 0.000 claims description 12
- ZCCIPPOKBCJFDN-UHFFFAOYSA-N calcium nitrate Chemical group [Ca+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ZCCIPPOKBCJFDN-UHFFFAOYSA-N 0.000 claims description 6
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical group [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 3
- 239000001110 calcium chloride Substances 0.000 claims description 3
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 150000003839 salts Chemical class 0.000 claims description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical group [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims 3
- 238000000926 separation method Methods 0.000 claims 1
- 230000029058 respiratory gaseous exchange Effects 0.000 abstract description 9
- 230000027455 binding Effects 0.000 abstract description 3
- 238000009739 binding Methods 0.000 abstract description 3
- 230000001376 precipitating effect Effects 0.000 abstract 1
- 235000011116 calcium hydroxide Nutrition 0.000 description 19
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 12
- 235000011941 Tilia x europaea Nutrition 0.000 description 12
- 238000006243 chemical reaction Methods 0.000 description 12
- 239000004571 lime Substances 0.000 description 12
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 10
- 239000000292 calcium oxide Substances 0.000 description 8
- 235000012255 calcium oxide Nutrition 0.000 description 8
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 6
- 238000010791 quenching Methods 0.000 description 6
- 230000000171 quenching effect Effects 0.000 description 6
- 239000012266 salt solution Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000001354 calcination Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 235000011118 potassium hydroxide Nutrition 0.000 description 3
- 229940093932 potassium hydroxide Drugs 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000002585 base Substances 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- 230000003444 anaesthetic effect Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 238000001311 chemical methods and process Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 239000012065 filter cake Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 231100000683 possible toxicity Toxicity 0.000 description 1
- 239000001103 potassium chloride Substances 0.000 description 1
- 235000011164 potassium chloride Nutrition 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/04—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of alkali metals, alkaline earth metals or magnesium
- B01J20/041—Oxides or hydroxides
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Analytical Chemistry (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
- Treating Waste Gases (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
ABSTRACT
A process for the production of a carbon dioxide absorbing material based on calcium hydroxide is disclosed. The process comprises precipitating calcium hydroxide from an aqueous solution of a calcium salt with an alkali hydroxide. The pre-cipitated product is filtered off, washed with water, dried and granulated. The material produced in this process has a very high and reproducible ability of binding carbon dioxide and can be advantageously used in breathing apparatuses.
A process for the production of a carbon dioxide absorbing material based on calcium hydroxide is disclosed. The process comprises precipitating calcium hydroxide from an aqueous solution of a calcium salt with an alkali hydroxide. The pre-cipitated product is filtered off, washed with water, dried and granulated. The material produced in this process has a very high and reproducible ability of binding carbon dioxide and can be advantageously used in breathing apparatuses.
Description
~F,~ 3~
This application relates to carbon dioxide absorbing materials. More particularly, the application relates to carbon dioxide absorbing materials based on calcium hydroxide.
In oxygen rebreathing apparatuses for gas masks and breathing apparatuses and in anaesthetic machines that are used in medicine, exhaled carbon dioxide is removed from the respira-tion cycle by absorption materials based on calcium hydroxide. As a rule, these absorption materials are produced by a process in which calcium oxide (quick lime) is slaked with water, the result-ing calcium hydroxide is stirred in excess water to form a highly viscous slurry, and then granulated in a suitable apparatus. The ii -granulated, slaked lime is then brought to a water content of approximately 16% by drying. In this form, it is used in breathing apparatuses (German Patent 893 752).
The process described heretofore it not sufficiently reproducible for those applications in which the respiration lime must have a very high reactivity to bind CO2, combined with good mechanical strength of the grains of lime. The reason for this is the very complex chemical process that takes place during the reaction of calcium oxide with water. The structure of the quick lime depends on the calcining temperature. Limestone that is calcined at temperatures between 900C and 1000C produces a loose, very reactive calcium oxide. At higher calcining temperatures t 1100C to 1300C, the resulting products are extremely hard and far less reactive, up to the point of "dead" lime that, for all practicaI purposes, can no longer be slaked. The qualities or ''',,''' ' ' ': ` '''' 2~n~73l grades of calcium oxide that are currently on the market are classified roughly into soft calcined lime ~calcining temperatures 900-1000C) and hard calcined lime (1100-1200C). In fact, all available grades of lime are mixtures of soft and hard calcined lime in varying proportions. This means that very frequently the quenching behavioux of the lime also changes, in that the quenching time is different and the temperatures of the quenched masses are elevated to various extents by the liberated reaction heat. However, the structure of the calcium hydroxide that is formed is greatly dependent on the parameters of the quenching reaction, in that a reaction that takes place quickly and at a high temperature forms particle sizes and structures that differ from those that are formed during slow reaction that takes place at lower temperatures. Finally, the ability of the particular absorption material to bind CO2 is determined by the conditions of the quenching reaction, so that it is hardly possible to produce by this method materials having a very high and reproducible bind-ing ability~
It is an object of the present invention to avoid the uncertainty of the quenching reaction and to produce highly reac-tive calcium hydroxide by a process having better reproducibility.
This qbject may be achieved by a process in which cal-caium salts are converted with alkali hydroxides in an aqueous solution and the calcium hydroxide that is precipitated is filtered off, dried, and granulated.
Thus,the present invention provides a process for the ~, .
.
2 ~ ~4~ ~
production of a carbon dioxide absorbing material based on calcium hydroxide, which process comprises treating a water soluble calcium salt in aqueous solution with an alkali hydroxide, separat-ing the precipitated calcium hydroxide, drying the separated material and granulating the dry product. ;-The advantages of the production process according to the present invention are such that, before precipitation, the calcium is present in the aqueous solution as an ion, so that a constantly reproducible and even distribution is ensured at a con-stant concentration. No noteworthy amounts of reaction heat are generated during the precipitation reaction. Thus, the tempera- -~
ture of the precipitation bath can be kept constant very easily.
Further precipitation parameters such as stirring speed, introduc-tion of the calcium salt solution into the alkali hydroxide solution, or vice versa, excessive salt solution or alkali hydroxide solution, can also be kept constant. This means that one can produce a calcium hydroxide with reproducible chemical and mechanical properties by way of precipitation from an aqueous solution.
The conventional quenching procedure is preferably carried out at temperatures from 70C to 80C; in contrast to this, the new process is carried out at room temperature. This results in a further advantage of considerable energy savings.
Calcium hydroxide produced by the conventional slaking method has an uneven grain distribution with grain sizes of up to 0.1 mm. There are frequent inclusions of calcium oxide in the : . .. , . . . , .: , : .
2~ 3731.
grains.
In contrast to this, the calcium hydroxide that is produced by the precipitation process according to the present invention is characterized by an even grain distribution, with grain sizes that are considerably less than 1 ~m. There are no inclusions of calcium oxide. During microscopic examination of a sample of calcium hydroxide, the structural differences set out heretofore can be plainly seen.
In principle, the precipitation reaction can be car-ried out using any water soluble calcium salt and any strong base.
When considered from the viewpoints of low raw mater-ial prices, high reaction speeds, high reaction yields, and the lowest possible toxicity of the chemicals involved, only calcium chloride and calcium nitrate as water soluble calcium salts and sodium, hydroxide and potassium hydroxide as strong bases can be considered for economic use. Calcium nitrate and potassium hydro-xide are preferred.
The ratio of the concentrations of calcium salt and alkali hydroxide in the solution and the temperature of the solu-tion have a decisive efect on the crystal structure and the crystal size of the calcium hydroxide that is precipitated. This once again affects the adsorption and strength properties of the finished respiration lime granulate.
It is also possible to deliberately modify the proper-ties of the respiration lime, either by the temperature of the solution during the precipitation of the calcium hydroxide or by 2~'73~
variation of the concentrations of the starting substances. Thus, the precipitation can be effected at a precise stoichiometric ratio, with an excess of alkali hydroxide, or with an excess of calcium salt. Furthermore, either the calcium salt solution can be added to the alkali hydroxide solution or, vice versa, the alkali hydroxide solution can be added to the calcium salt solution.
These different process variants lead to different local concen-tration conditions during the precipitation reaction and thereby affect the properties of the calcium hydroxide that is formed.
In order to free the precipitated calcium hydroxide from residues of the starting substances, it is filtered and washed until the content of an alkali hydroxide and/or salts falls below 6~. The residues content above 6~ affects negatively the adsorp-tion capacity of the respiration lime.
The calcium hydroxide that is washed out is then dried to the point that it can be granulated in the known manner in a paste granulator. The granulated calcium hydroxide is then brought to a water content of 15-20%, and can be used in this form as respiration lime.
The production process is explained in greater detail in the following example:
500 g,of calcium chloride and 600 g of potassium hydroxide are each dissolved in 4 1 of water and the temperature of the solutions is brought to 20C. The calcium hydroxide solution is added slowly to the potassium hydroxide solution under moderate stirring. The precipitate that forms is drawn off with 5 _ ,"' ' ;' :, ',, ".,; , , :' . ' ', ~ ` ' : ' '. .
. . : .. ~ . ~ . . . .
2~'3731.
a filter press and gently washed until the wash water contains only very small quantities of potassium chloride. The filter cake is granulated in a paste granulator to obtain a grain size of 4-5 mm and is then dried to a water content of 16%. The product that is obtained displays extremely good binding ability for C02 and can also be used to absorb C02 in oxygen rebreathing apparatuses under extreme conditions.
~ ~ .: ' ' :' ' ' ,
This application relates to carbon dioxide absorbing materials. More particularly, the application relates to carbon dioxide absorbing materials based on calcium hydroxide.
In oxygen rebreathing apparatuses for gas masks and breathing apparatuses and in anaesthetic machines that are used in medicine, exhaled carbon dioxide is removed from the respira-tion cycle by absorption materials based on calcium hydroxide. As a rule, these absorption materials are produced by a process in which calcium oxide (quick lime) is slaked with water, the result-ing calcium hydroxide is stirred in excess water to form a highly viscous slurry, and then granulated in a suitable apparatus. The ii -granulated, slaked lime is then brought to a water content of approximately 16% by drying. In this form, it is used in breathing apparatuses (German Patent 893 752).
The process described heretofore it not sufficiently reproducible for those applications in which the respiration lime must have a very high reactivity to bind CO2, combined with good mechanical strength of the grains of lime. The reason for this is the very complex chemical process that takes place during the reaction of calcium oxide with water. The structure of the quick lime depends on the calcining temperature. Limestone that is calcined at temperatures between 900C and 1000C produces a loose, very reactive calcium oxide. At higher calcining temperatures t 1100C to 1300C, the resulting products are extremely hard and far less reactive, up to the point of "dead" lime that, for all practicaI purposes, can no longer be slaked. The qualities or ''',,''' ' ' ': ` '''' 2~n~73l grades of calcium oxide that are currently on the market are classified roughly into soft calcined lime ~calcining temperatures 900-1000C) and hard calcined lime (1100-1200C). In fact, all available grades of lime are mixtures of soft and hard calcined lime in varying proportions. This means that very frequently the quenching behavioux of the lime also changes, in that the quenching time is different and the temperatures of the quenched masses are elevated to various extents by the liberated reaction heat. However, the structure of the calcium hydroxide that is formed is greatly dependent on the parameters of the quenching reaction, in that a reaction that takes place quickly and at a high temperature forms particle sizes and structures that differ from those that are formed during slow reaction that takes place at lower temperatures. Finally, the ability of the particular absorption material to bind CO2 is determined by the conditions of the quenching reaction, so that it is hardly possible to produce by this method materials having a very high and reproducible bind-ing ability~
It is an object of the present invention to avoid the uncertainty of the quenching reaction and to produce highly reac-tive calcium hydroxide by a process having better reproducibility.
This qbject may be achieved by a process in which cal-caium salts are converted with alkali hydroxides in an aqueous solution and the calcium hydroxide that is precipitated is filtered off, dried, and granulated.
Thus,the present invention provides a process for the ~, .
.
2 ~ ~4~ ~
production of a carbon dioxide absorbing material based on calcium hydroxide, which process comprises treating a water soluble calcium salt in aqueous solution with an alkali hydroxide, separat-ing the precipitated calcium hydroxide, drying the separated material and granulating the dry product. ;-The advantages of the production process according to the present invention are such that, before precipitation, the calcium is present in the aqueous solution as an ion, so that a constantly reproducible and even distribution is ensured at a con-stant concentration. No noteworthy amounts of reaction heat are generated during the precipitation reaction. Thus, the tempera- -~
ture of the precipitation bath can be kept constant very easily.
Further precipitation parameters such as stirring speed, introduc-tion of the calcium salt solution into the alkali hydroxide solution, or vice versa, excessive salt solution or alkali hydroxide solution, can also be kept constant. This means that one can produce a calcium hydroxide with reproducible chemical and mechanical properties by way of precipitation from an aqueous solution.
The conventional quenching procedure is preferably carried out at temperatures from 70C to 80C; in contrast to this, the new process is carried out at room temperature. This results in a further advantage of considerable energy savings.
Calcium hydroxide produced by the conventional slaking method has an uneven grain distribution with grain sizes of up to 0.1 mm. There are frequent inclusions of calcium oxide in the : . .. , . . . , .: , : .
2~ 3731.
grains.
In contrast to this, the calcium hydroxide that is produced by the precipitation process according to the present invention is characterized by an even grain distribution, with grain sizes that are considerably less than 1 ~m. There are no inclusions of calcium oxide. During microscopic examination of a sample of calcium hydroxide, the structural differences set out heretofore can be plainly seen.
In principle, the precipitation reaction can be car-ried out using any water soluble calcium salt and any strong base.
When considered from the viewpoints of low raw mater-ial prices, high reaction speeds, high reaction yields, and the lowest possible toxicity of the chemicals involved, only calcium chloride and calcium nitrate as water soluble calcium salts and sodium, hydroxide and potassium hydroxide as strong bases can be considered for economic use. Calcium nitrate and potassium hydro-xide are preferred.
The ratio of the concentrations of calcium salt and alkali hydroxide in the solution and the temperature of the solu-tion have a decisive efect on the crystal structure and the crystal size of the calcium hydroxide that is precipitated. This once again affects the adsorption and strength properties of the finished respiration lime granulate.
It is also possible to deliberately modify the proper-ties of the respiration lime, either by the temperature of the solution during the precipitation of the calcium hydroxide or by 2~'73~
variation of the concentrations of the starting substances. Thus, the precipitation can be effected at a precise stoichiometric ratio, with an excess of alkali hydroxide, or with an excess of calcium salt. Furthermore, either the calcium salt solution can be added to the alkali hydroxide solution or, vice versa, the alkali hydroxide solution can be added to the calcium salt solution.
These different process variants lead to different local concen-tration conditions during the precipitation reaction and thereby affect the properties of the calcium hydroxide that is formed.
In order to free the precipitated calcium hydroxide from residues of the starting substances, it is filtered and washed until the content of an alkali hydroxide and/or salts falls below 6~. The residues content above 6~ affects negatively the adsorp-tion capacity of the respiration lime.
The calcium hydroxide that is washed out is then dried to the point that it can be granulated in the known manner in a paste granulator. The granulated calcium hydroxide is then brought to a water content of 15-20%, and can be used in this form as respiration lime.
The production process is explained in greater detail in the following example:
500 g,of calcium chloride and 600 g of potassium hydroxide are each dissolved in 4 1 of water and the temperature of the solutions is brought to 20C. The calcium hydroxide solution is added slowly to the potassium hydroxide solution under moderate stirring. The precipitate that forms is drawn off with 5 _ ,"' ' ;' :, ',, ".,; , , :' . ' ', ~ ` ' : ' '. .
. . : .. ~ . ~ . . . .
2~'3731.
a filter press and gently washed until the wash water contains only very small quantities of potassium chloride. The filter cake is granulated in a paste granulator to obtain a grain size of 4-5 mm and is then dried to a water content of 16%. The product that is obtained displays extremely good binding ability for C02 and can also be used to absorb C02 in oxygen rebreathing apparatuses under extreme conditions.
~ ~ .: ' ' :' ' ' ,
Claims (10)
1. A process for the production of a carbon dioxide absorbing material based on calcium hydroxide, which process com-prises treating a water soluble calcium salt in aqueous solution with an alkali hydroxide, separating the precipitated calcium hydroxide, drying the separated material and granulating the dry product.
2. A process as defined in claim 1, wherein the water soluble calcium salt is calcium chloride.
3. A process as defined in claim 1, wherein the water soluble calcium salt is calcium nitrate.
4. A process as defined in claim 1, wherein the alkali hydroxide is sodium hydroxide.
5. A process as defined in claim 1, wherein the alkali hydroxide is potassium hydroxide.
6. A process as defined in claim 1, 2, 3, 4 or 5, wherein the precipitated calcium hydroxide is washed after separation to an alkali hydroxide and/or salt content of less than 6%.
7. A process as defined in claim 1, 2, 3, 4 or 5, wherein the precipitation takes place in an excess of alkali hydroxide.
8. A process as defined in claim 1, 2, 3, 4 or 5, wherein the precipitation is carried out in an excess of calcium salt.
9. A process as defined in claim 1, 2, 3, 4 or 5, wherein the solution of the calcium salt is added to the solution of the alkali hydroxide.
10. A process as defined in claim 1, 2, 3, 4 or 5, wherein the solution of the alkali hydroxide is added to the solution of the calcium salt.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP3904110.7 | 1989-02-11 | ||
| DE19893904110 DE3904110A1 (en) | 1989-02-11 | 1989-02-11 | METHOD FOR PRODUCING A CARBON DIOXIDE ABSORBENT |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2009731A1 true CA2009731A1 (en) | 1990-08-11 |
Family
ID=6373876
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2009731 Abandoned CA2009731A1 (en) | 1989-02-11 | 1990-02-09 | Process for the production of an absorption mass for carbon dioxide |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0383105A1 (en) |
| BR (1) | BR9000533A (en) |
| CA (1) | CA2009731A1 (en) |
| DE (1) | DE3904110A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6867165B2 (en) | 2002-09-09 | 2005-03-15 | W. R. Grace & Co. -Conn. | Calcium hydroxide absorbent with rheology modifier and process involving same |
| CN104069793A (en) * | 2014-06-21 | 2014-10-01 | 总装备部工程设计研究总院 | Preparation method of calcium hydroxide nano particles with high adsorption activity |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2152251C2 (en) * | 1998-03-12 | 2000-07-10 | Тамбовский научно-исследовательский химический институт | Method of synthesis of carbon dioxide adsorbent |
| RU2210416C1 (en) * | 2002-07-02 | 2003-08-20 | Федеральное государственное унитарное предприятие "Тамбовский научно-исследовательский химический институт" | Regenerative product and a method for preparation thereof |
| MXPA04011308A (en) | 2003-11-17 | 2005-09-08 | Daewoo Electronics Corp | Case for carrying and mounting an image system in a car. |
| CN103058243B (en) * | 2012-12-31 | 2015-05-27 | 杭州师范大学 | Nanometer calcium oxide and application thereof |
| WO2024197364A1 (en) | 2023-03-30 | 2024-10-03 | Nicodemos Da Silva Sidney | Matrices and process for mitigating carbon dioxide (co2) and other greenhouse gases using calcium phosphates compositions and apatites via physisorption and photocatalysis |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DD42685A (en) * | ||||
| US1333524A (en) * | 1918-11-15 | 1920-03-09 | Robert E Wilson | Absorbent |
| DE893752C (en) * | 1941-12-06 | 1953-10-19 | Draegerwerk Ag | Process for producing an acidic gas, in particular carbonic acid, absorbing mass |
| GB661080A (en) * | 1949-08-05 | 1951-11-14 | Nat Res Dev | Improvements in or relating to the manufacture of alkali lime |
-
1989
- 1989-02-11 DE DE19893904110 patent/DE3904110A1/en not_active Withdrawn
-
1990
- 1990-02-01 EP EP90101980A patent/EP0383105A1/en not_active Withdrawn
- 1990-02-07 BR BR9000533A patent/BR9000533A/en unknown
- 1990-02-09 CA CA 2009731 patent/CA2009731A1/en not_active Abandoned
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6867165B2 (en) | 2002-09-09 | 2005-03-15 | W. R. Grace & Co. -Conn. | Calcium hydroxide absorbent with rheology modifier and process involving same |
| CN104069793A (en) * | 2014-06-21 | 2014-10-01 | 总装备部工程设计研究总院 | Preparation method of calcium hydroxide nano particles with high adsorption activity |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3904110A1 (en) | 1990-08-23 |
| EP0383105A1 (en) | 1990-08-22 |
| BR9000533A (en) | 1991-01-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US2085129A (en) | Production of colloidal metal hydroxides | |
| US4656156A (en) | Adsorbent and substrate products and method of producing same | |
| US3557025A (en) | Method of producing alkalized alumina and products produced thereby | |
| JP2001070726A (en) | Carbon dioxide absorption method and carbon dioxide adsorbent and production of the same | |
| JPH0582324B2 (en) | ||
| KR20060036459A (en) | Reducing Agent for Soluble Chromate Content in Cement and Methods for Making the Same | |
| CA2009731A1 (en) | Process for the production of an absorption mass for carbon dioxide | |
| CN117000198A (en) | Method for preparing lithium adsorbent and extracting lithium from Bayer process to prepare lithium carbonate | |
| CN107848828B (en) | High solid PCC with depolymerized carboxylated cellulose | |
| CN103601156B (en) | A kind of insoluble sulfur and preparation method thereof | |
| KR0135365B1 (en) | Process for removal of sulphate ions present in saline | |
| JPS6236021A (en) | Production of calcium carbonate having low strontium content | |
| CN111137910A (en) | Method for preparing high-purity superfine magnesium hydroxide flame retardant by chemical method | |
| BG61108B1 (en) | METHOD FOR PREPARING CARBONATES OF ALKALINE METALS | |
| US1540445A (en) | Gellike absorbent and process of making same | |
| US2210892A (en) | Process for recovering magnesium oxide | |
| JP2001270713A (en) | Method for producing calcium carbonate having aragonite crystal system | |
| JPS6335571B2 (en) | ||
| JPH0230614A (en) | Production of fine particular cubic calcium carbonate | |
| CN117263533A (en) | Porous spherical calcium oxide powder with micro-nano structure and preparation method and application thereof | |
| CN115353139A (en) | Preparation method of high-purity calcium carbonate | |
| JP2007126333A (en) | Vaterite disk-like calcium carbonate and method for producing the same | |
| CN106830042A (en) | The method that a kind of utilization Weihe north Ordovician limestone prepares the ultra-fine carbonic acid fine particle calcium carbonate of rhombohedron shape | |
| US3067023A (en) | Process for the upgrading of rock phosphate | |
| US2805140A (en) | Briquette of synthetic chromium ore |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Dead |