CN114890905A - Method for synthesizing diethanolisopropanolamine - Google Patents
Method for synthesizing diethanolisopropanolamine Download PDFInfo
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- CN114890905A CN114890905A CN202210550179.2A CN202210550179A CN114890905A CN 114890905 A CN114890905 A CN 114890905A CN 202210550179 A CN202210550179 A CN 202210550179A CN 114890905 A CN114890905 A CN 114890905A
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C213/00—Preparation of compounds containing amino and hydroxy, amino and etherified hydroxy or amino and esterified hydroxy groups bound to the same carbon skeleton
- C07C213/04—Preparation of compounds containing amino and hydroxy, amino and etherified hydroxy or amino and esterified hydroxy groups bound to the same carbon skeleton by reaction of ammonia or amines with olefin oxides or halohydrins
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C213/00—Preparation of compounds containing amino and hydroxy, amino and etherified hydroxy or amino and esterified hydroxy groups bound to the same carbon skeleton
- C07C213/10—Separation; Purification; Stabilisation; Use of additives
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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Abstract
The application relates to the field of cement additives, in particular to a method for synthesizing diethanol monoisopropanolamine, which comprises the following preparation steps: s1: adding isopropanolamine into the reaction kettle, starting a stirring device, introducing inert gas to maintain the pressure in the reaction kettle at 0.3-0.6Mpa, and introducing ethylene oxide into the reaction kettle; s2: and adding the auxiliary agent into a reaction kettle, raising the temperature of the reaction kettle to 35-70 ℃, preserving the temperature, reacting for 1-4h, and filtering to obtain the diethanol monoisopropanolamine product. Sulfate ions in the adjuvant weaken the steric hindrance of the intermediate product N-hydroxyethyl monoisopropanolamine, reduce the generation of byproducts, and improve the purity of diethanol monoisopropanolamine.
Description
Technical Field
The application relates to the field of cement additives, in particular to a method for synthesizing diethanol monoisopropanolamine.
Background
In the grinding process of cement clinker, a small amount of cement grinding aid is added, so that the cement grinding aid can obviously improve the grinding efficiency or reduce the energy consumption, and the performance of cement cannot be damaged.
In the field of cement grinding aids, most of the formula of the cement grinding aid is a product with single or composite chemical raw materials such as alcohols, alcamines, acetates and the like, and compared with other similar cement additives, the diethanol monoisopropanolamine has greater advantages in the aspects of improving grinding efficiency, saving energy, reducing consumption and improving cement strength compared with other alcamines products.
In the prior art, monoisopropanolamine and ethylene oxide are adopted to generate diethanolisopropanolamine through two-step reaction, however, the intermediate product N-hydroxyethyl monoisopropanolamine generated in the reaction process has larger steric hindrance, can generate more high-boiling-point products, and reduces the purity of the diethanolisopropanolamine.
Disclosure of Invention
In order to reduce the steric hindrance of an intermediate product N-hydroxyethyl monoisopropanolamine, facilitate the occurrence of a series of reactions, reduce the generation of high-boiling-point products and further improve the purity of diethanol monoisopropanolamine, the invention provides a synthesis method of diethanol monoisopropanolamine.
In a first aspect, the present application provides a method for synthesizing diethanolisopropanolamine, which adopts the following technical scheme: a method for synthesizing diethanol monoisopropanolamine comprises the following preparation steps:
s1: the reaction kettle is in an inert gas environment, isopropanolamine is added into the reaction kettle, a stirring device is started, then inert gas is introduced to maintain the pressure in the reaction kettle to be 0.3-0.6Mpa, and ethylene oxide is introduced into the reaction kettle;
s2: adding the auxiliary agent into a reaction kettle, raising the temperature of the reaction kettle to 35-70 ℃, preserving the temperature, reacting for 1-4h, and filtering to obtain a diethanol monoisopropanolamine product;
the auxiliary agent comprises the following raw materials in parts by weight:
15-30 parts of sodium sulfate, 91.5-183 parts of activated carbon powder and 30.7-61.5 parts of water.
By adopting the technical scheme, the isopropanolamine reacts with the ethylene oxide to generate the N-hydroxyethyl-isopropanolamine, and the N-hydroxyethyl-isopropanolamine continuously reacts with the ethylene oxide to generate the diethanolisopropanolamine. In the reaction process, the activated carbon powder releases sodium sulfate along with the rise of the temperature, sulfate ions in the sodium sulfate shrink the chain of the intermediate product N-hydroxyethyl-isopropanolamine, the steric hindrance of the N-hydroxyethyl-isopropanolamine is weakened, the reaction of the N-hydroxyethyl-isopropanolamine and ethylene oxide is facilitated, the series reaction is improved, the generation of high-boiling-point byproducts is reduced, and the purity of the generated diethanol-monoisopropanolamine is improved.
The activated carbon powder in the auxiliary agent adsorbs sodium sulfate dissolved in water, the auxiliary agent is placed in the reaction kettle, the activated carbon powder increases the buoyancy of the sodium sulfate, the auxiliary agent is conveniently mixed with the isopropanolamine and the ethylene oxide uniformly, sulfate ions are facilitated to act on an intermediate product, and the purity of the diethanol monoisopropanolamine is further improved. The active carbon powder reduces the speed of releasing sodium sulfate in the reaction process, increases the aging time of the action of the sodium sulfate, removes the sodium sulfate and the active carbon powder in the product by filtration after the reaction, and increases the purity of the diethanol monoisopropanolamine.
In conclusion, the activated carbon powder adsorbs the sodium sulfate dissolved in water, so that the buoyancy of the sodium sulfate is improved, the sodium sulfate is convenient to contact with the isopropanolamine and the ethylene oxide, the steric hindrance of the intermediate product is reduced by sulfate ions, the reaction of the intermediate product and the ethylene oxide is facilitated, the generation of high-boiling-point byproducts is reduced, and the activated carbon powder and the sodium sulfate in the product are removed by filtration, so that the purity of the generated diethanol monoisopropanolamine is improved.
Preferably, the diethanol monoisopropanolamine comprises the following raw materials in parts by weight: 75-140 parts of isopropanolamine, 88-164.2 parts of ethylene oxide and 1.6-3 parts of an auxiliary agent.
By adopting the technical scheme, the ratio of the monoisopropanolamine to the ethylene oxide is smaller, which is beneficial to reducing the occurrence of side reaction, and the dosage of the auxiliary agent is beneficial to obtaining better weakening effect on the steric hindrance of the intermediate product N-hydroxyethyl monoisopropanolamine.
Preferably, the adjuvant comprises the following preparation steps:
t1: dissolving sodium sulfate in water, stirring, adding activated carbon powder, and stirring for 0.6-1.5 hr to obtain adjuvant.
By adopting the technical scheme, after the sodium sulfate is dissolved in water, the activated carbon powder can be conveniently adsorbed. In the process of adsorbing the activated carbon powder, the time for uniformly stirring is short, so that the activated carbon powder is not easy to be uniformly mixed and adsorbed, and the stirring time is too long, so that energy is consumed, and resources are wasted.
Preferably, the stirring speed of the reaction kettle in the step S3 is 300-500 r/min.
By adopting the technical scheme, the stirring speed of the reaction kettle is low, the auxiliary agent, the isopropanolamine and the ethylene oxide are not easy to be uniformly stirred, the stirring speed is high, and the energy loss is large, so that the scheme that the stirring speed of the reaction kettle is 300-one-500 r/min is preferred.
Preferably, the diethanol monoisopropanolamine comprises the following raw materials in parts by weight: 90-120 parts of isopropanolamine, 105.6-140.8 parts of ethylene oxide and 1.96-2.61 parts of auxiliary agent.
By adopting the technical scheme, the dosage of the diethanol monoisopropanolamine adopting the technical scheme is better.
Preferably, the auxiliary agent comprises the following raw materials in parts by weight: 20-27 parts of sodium sulfate, 122-164.7 parts of activated carbon powder and 41-55 parts of water.
By adopting the technical scheme, the auxiliary agent has better dosage by adopting the technical scheme.
Preferably, the particle size of the activated carbon powder is 600-840 meshes.
By adopting the technical scheme, the granularity of the activated carbon powder is small, and the filtering time is long during filtering separation; the particle size of the activated carbon powder is larger, the contact area of the activated carbon powder and the intermediate product is smaller in the reaction process, and sulfate ions are not easy to play a role in the intermediate product, so the scheme of adopting the particle size of the activated carbon powder of 600-840 is better.
Preferably, the inert gas is nitrogen.
By adopting the scheme, the scheme that the inert gas is nitrogen is better, and the nitrogen is easier to obtain than other inert gases.
In summary, the present application has the following beneficial effects:
1. as the auxiliary agent is adopted, the intermediate product N-hydroxyethyl-isopropanolamine is generated in the reaction process, and sulfate ions in the auxiliary agent weaken the steric hindrance of the N-hydroxyethyl-isopropanolamine, reduce the generation of high-boiling-point byproducts and further improve the purity of the generated diethanol-monoisopropanolamine.
2. In the application, activated carbon powder is preferably adopted to adsorb sodium sulfate dissolved in water, after the activated carbon powder is added into a reaction kettle, the activated carbon powder improves the buoyancy of the sodium sulfate, so that the sodium sulfate, the isopropanolamine and the ethylene oxide can be uniformly mixed conveniently, the release speed of the sodium sulfate is reduced, and the aging effect of the sodium sulfate is improved.
3. The granularity of the activated carbon powder is selected, the contact area of the activated carbon powder with the isopropanolamine and the ethylene oxide is increased in the reaction process, the reaction efficiency is increased, and the activated carbon powder and the sodium sulfate in the product can be conveniently removed after the reaction is finished.
Detailed Description
The present application will be described in further detail with reference to examples.
Raw materials
Ethylene oxide: from billion chemical ltd, calix, CAS number: 75-21-8;
monoisopropanolamine: from chemical Limited, Hengjing, Hubei, CAS number: 78-96-6.
Preparation example
Preparation examples 1 to 5
The preparation of an adjuvant according to preparation 1 to 5, with the starting materials and the amounts of the starting materials indicated in Table 1, was carried out as follows:
t1: dissolving sodium sulfate in water, stirring, adding activated carbon powder, and stirring for 0.6 hr to obtain adjuvant.
Wherein the particle size of the activated carbon powder is 600 meshes.
TABLE 1 preparation of adjuvants of examples 1-3 and amounts (kg) of the respective materials
| Preparation example 1 | Preparation example 2 | Preparation example 3 | Preparation example 4 | Preparation example 5 | |
| Sodium sulfate | 15 | 20 | 24 | 27 | 30 |
| Activated carbon powder | 91.5 | 122 | 146.4 | 164.7 | 183 |
| Water (W) | 30.7 | 41 | 49.2 | 55 | 61.5 |
Preparation example 6
An adjuvant which was different from preparation example 3 in that it was stirred uniformly for 1 hour, and the rest of the procedure was the same as in preparation example 3.
Preparation example 7
An adjuvant which was different from preparation example 3 in that it was stirred uniformly for 1.5 hours, and the rest of the procedure was the same as in preparation example 3.
Preparation example 8
An adjuvant was different from preparation example 3 in that the particle size of the added activated carbon powder was 710 mesh, and the rest of the procedure was the same as in preparation example 3.
Preparation example 9
An adjuvant was different from preparation example 3 in that the particle size of the added activated carbon powder was 840 mesh, and the rest of the procedure was the same as in preparation example 3.
Examples
Examples 1 to 5
The preparation of diethanol monoisopropanolamine of examples 1-5, using the starting materials and amounts thereof as shown in Table 2, is as follows:
s1: adding isopropanolamine into the reaction kettle with inert gas in the reaction kettle, starting a stirring device, introducing nitrogen to maintain the pressure in the reaction kettle at 0.3Mpa, and introducing ethylene oxide into the reaction kettle;
s3: and adding the auxiliary agent into the reaction kettle, raising the temperature of the reaction kettle to 35 ℃, uniformly stirring at the stirring speed of 300r/min, then carrying out heat preservation reaction for 1h, and then filtering to obtain the diethanol monoisopropanolamine product.
Wherein the adjuvant is from preparation 1.
TABLE 2 raw materials and amounts (kg) of raw materials of examples 1 to 5
| Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | |
| Ethylene oxide | 88 | 105.6 | 131.4 | 140.8 | 164.2 |
| Monoisopropanolamine | 75 | 90 | 112 | 120 | 140 |
| Auxiliary agent | 1.6 | 1.6 | 1.6 | 1.6 | 1.6 |
Example 6
Diethanolisopropanolamine is different from example 3 in that the adjuvant added is from preparation 2, and the rest of the procedure is the same as example 3.
Example 7
Diethanol monoisopropanolamine differs from example 3 in that the adjuvant added is from preparation 3 and the rest of the procedure is the same as in example 3.
Example 8
Diethanol monoisopropanolamine differs from example 3 in that the adjuvant added is from preparation 4 and the rest of the procedure is the same as in example 3.
Example 9
Diethanol monoisopropanolamine differs from example 3 in that the adjuvant added comes from preparation 5 and the rest of the procedure is the same as in example 3.
Example 10
Diethanol monoisopropanolamine differs from example 7 in that the adjuvant added is from preparation 6 and the rest of the procedure is the same as in example 7.
Example 11
Diethanol monoisopropanolamine differs from example 7 in that the adjuvant added is from preparation 7 and the rest of the procedure is the same as in example 7.
Example 12
Diethanol monoisopropanolamine differs from example 10 in that the adjuvant added is from preparation 8 and the rest of the procedure is the same as in example 10.
Example 13
Diethanol monoisopropanolamine differs from example 10 in that the adjuvant added is from preparation 9 and the rest of the procedure is the same as in example 10.
Example 14
Diethanolisopropanolamine is different from example 12 in that the amount of the adjuvant added is 1.96kg, and the rest of the procedure is the same as example 12.
Example 15
Diethanol monoisopropanolamine, which differs from example 12 in that the amount of adjuvant added is 2.43kg, the rest of the procedure being identical to example 12.
Example 16
Diethanolisopropanolamine is different from example 12 in that the amount of the adjuvant added is 2.61kg, and the rest of the procedure is the same as example 12.
Example 17
Diethanolisopropanolamine is different from example 12 in that the amount of the adjuvant added is 3kg, and the rest of the procedure is the same as in example 12.
Example 18
A diethanol monoisopropanolamine differing from example 15 in that the pressure in the reaction vessel in step S2 was 0.4MPa, and the same procedure as in example 15 was repeated.
Example 19
A diethanol monoisopropanolamine differing from example 15 in that the pressure in the reaction vessel in step S2 was 0.6MPa, and the same procedure as in example 15 was repeated.
Example 20
Diethanolisopropanolamine is the same as in example 15 except that the temperature in the reaction vessel in step S3 is 55 ℃.
Example 21
Diethanolisopropanolamine is the same as in example 15 except that the temperature in the reaction vessel in step S3 is 70 ℃.
Example 22
A diethanol monoisopropanolamine, which is different from example 20 in that the reaction time under the condition of heat preservation in step S3 is 1.5h, and the rest steps are the same as those in example 20.
Example 23
A diethanol monoisopropanolamine differing from example 20 in that the reaction time in step S3 was kept at 4 hours, and the rest of the procedure was the same as in example 20.
Example 24
A diethanol monoisopropanolamine differing from example 23 in that the stirring speed of the reaction vessel in step S3 was 420r/min, and the rest of the procedure was the same as in example 23.
Example 25
A diethanol monoisopropanolamine differing from example 23 in that the stirring speed of the reaction vessel in step S3 was 500r/min, and the rest of the procedure was the same as in example 23.
Example 26
A diethanol monoisopropanolamine which differs from example 24 in that the inert gas introduced is argon and the rest of the procedure is the same as in example 24.
Comparative example
Comparative example 1
Diethanolisopropanolamine is different from example 3 in that the amount of the adjuvant added is 0, and the rest of the procedure is the same as example 3.
Comparative example 2
Diethanolisopropanolamine is different from example 3 in that the amount of sodium sulfate added as an auxiliary agent is 0, and the rest of the procedure is the same as in example 3.
Comparative example 3
A diethanol monoisopropanolamine, which is different from example 3 in that the amount of activated carbon powder in the added adjuvant is 0, and the rest of the procedure is the same as example 3.
Performance test
Detection method
The following performance tests were performed on one of the diethanol monoisopropanolamines of examples 1 to 26 of the present application and comparative examples 1 to 3.
The results of analyzing the diethanol monoisopropanolamine obtained in the above examples 1 to 26 and comparative examples 1 to 3 by gas chromatography are shown in Table 3.
TABLE 3 chromatographic analysis results of diethanolisopropanolamine
| Content of diethanol monoisopropanolamine/%) | Content of by-products/%) | |
| Example 1 | 84.5 | 4.9 |
| Example 2 | 85.2 | 4.5 |
| Example 3 | 87 | 4.1 |
| Example 4 | 85.8 | 4.3 |
| Example 5 | 84.8 | 4.7 |
| Example 6 | 88.1 | 3.8 |
| Example 7 | 88.6 | 3.6 |
| Example 8 | 87.7 | 3.9 |
| Example 9 | 87.3 | 4 |
| Example 10 | 89.2 | 3.4 |
| Practice ofExample 11 | 88.9 | 3.5 |
| Example 12 | 92 | 1.9 |
| Example 13 | 89.8 | 3 |
| Example 14 | 90.3 | 2.6 |
| Example 15 | 90.7 | 2.2 |
| Example 16 | 90.1 | 2.8 |
| Example 17 | 90.5 | 2.4 |
| Example 18 | 91.7 | 2 |
| Example 19 | 91.2 | 2.1 |
| Example 20 | 93 | 1.5 |
| Example 21 | 92.3 | 1.7 |
| Example 22 | 93.2 | 1.3 |
| Example 23 | 93.7 | 1.2 |
| Example 24 | 94.9 | 0.7 |
| Example 25 | 93.9 | 1 |
| Example 26 | 94.1 | 0.9 |
| Comparative example 1 | 58.3 | 10.4 |
| Comparative example 2 | 59 | 10.1 |
| Comparative example 3 | 68.2 | 8.5 |
The present application is described in detail below with reference to the data provided in table 3.
Examples 1 to 5 and comparative example 1 examined the effect of the adjuvant, and as a result, it was found that the results of examples 1 to 5 were superior to those of comparative example 1. The application prepares diethanol monoisopropanolamine by mixing monoisopropanol with ethylene oxide and then adding an auxiliary agent. In the reaction process, ethylene oxide reacts with monoisopropanolamine to generate N-hydroxyethyl monoisopropanolamine, the N-hydroxyethyl monoisopropanolamine reacts with ethylene oxide to generate diethanolisopropanolamine, sodium sulfate is released from activated carbon powder in the auxiliary agent in the reaction process, and the sulfate ions weaken the steric hindrance of the intermediate product N-hydroxyethyl monoisopropanolamine, reduce the generation of high-boiling-point by-products and further improve the diethanolisopropanolamine. The activated carbon powder increases the buoyancy of the sodium sulfate, so that the sodium sulfate is uniformly mixed in the stirring process, and after the activated carbon powder releases the sodium sulfate, sulfate ions are increased to contact with an intermediate product, so that the action of the sulfate ions is improved, and further, the purity of the diethanol monoisopropanolamine is improved.
Examples 1 to 5 and comparative example 2 examined the effect of sodium sulfate, and as a result, the results of examples 1 to 5 were found to be superior. In examples 1 to 5, the sulfate ion in sodium sulfate reduced the steric hindrance of the intermediate product, and the generation of high-boiling by-products was reduced, thereby increasing the purity of the produced diethanolisopropanolamine.
Examples 1 to 5 and comparative example 3 examined the effect of the activated carbon powder, and as a result, the results of examples 1 to 5 were found to be superior. In examples 1 to 5, the activated carbon powder increased the buoyancy of sodium sulfate, which facilitated uniform mixing of sodium sulfate, ethylene oxide and monoisopropanolamine, thereby increasing the contact of sulfate ions with the intermediate product, contributing to the reduction of steric hindrance of the intermediate product, and further increasing the purity of the produced diethanolisopropanolamine.
In addition to examples 1-5, there were other experimental groups during the development of this application, of which example 3 was the relatively superior group of all experimental groups and was therefore taken out separately.
Example 3 and examples 6-9 examined the effect of different amounts of adjuvant materials and found that the results of example 7 were superior.
Example 7 examined the effect of different re-stirring times in step T1 as compared to examples 10-11, and the protocol of example 10 was found to be superior.
Example 10 and examples 12-13 examined the effect of different activated carbon powder particle sizes and found that the scheme of example 12 is superior.
Example 12 and examples 14-17 examined the effect of different adjuvant dosages and found that the protocol of example 15 was superior.
In example 15, the influence of the pressure in the different reaction vessels in step S2 was examined together with examples 18 to 19, and it was found that the results of example 15 were excellent.
In example 15, the influence of different temperatures in the reaction vessel in step S3 was examined in comparison with examples 20 to 21, and as a result, the results of example 20 were found to be excellent.
Example 20 and examples 22 to 23 examined the effect of different incubation reaction times in the reaction vessel in step S3, and as a result, the results of example 22 were found to be superior.
In example 22 and examples 24 to 25, the influence of the stirring speeds of the different reaction vessels in step S3 was examined, and as a result, the results of example 24 were found to be excellent.
The effect of different inert gases was examined for example 24 and example 26, and as a result, the results of example 24 were found to be superior.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (8)
1. A method for synthesizing diethanol monoisopropanolamine is characterized by comprising the following steps: the preparation method comprises the following preparation steps:
s1: the reaction kettle is in an inert gas environment, isopropanolamine is added into the reaction kettle, a stirring device is started, then inert gas is introduced to maintain the pressure in the reaction kettle to be 0.3-0.6Mpa, and ethylene oxide is introduced into the reaction kettle;
s2: adding the auxiliary agent into a reaction kettle, raising the temperature of the reaction kettle to 35-70 ℃, preserving the temperature, reacting for 1-4h, and filtering to obtain a diethanol monoisopropanolamine product;
the auxiliary agent comprises the following raw materials in parts by weight:
15-30 parts of sodium sulfate, 91.5-183 parts of activated carbon powder and 30.7-61.5 parts of water.
2. The method for synthesizing diethanolisopropanolamine according to claim 1, characterized in that: the diethanol monoisopropanolamine comprises the following raw materials in parts by weight: 75-140 parts of isopropanolamine, 88-164.2 parts of ethylene oxide and 1.6-3 parts of auxiliary agent.
3. The method for synthesizing diethanolisopropanolamine according to claim 2, characterized in that: the adjuvant comprises the following preparation steps:
t1: dissolving sodium sulfate in water, stirring, adding activated carbon powder, and stirring for 0.6-1.5 hr to obtain adjuvant.
4. The method of claim 3, wherein the synthesis of diethanol monoisopropanolamine comprises the following steps: the stirring speed of the reaction kettle in the step S3 is 300-500 r/min.
5. The method of claim 3, wherein the synthesis of diethanol monoisopropanolamine comprises the following steps: the diethanol monoisopropanolamine comprises the following raw materials in parts by weight: 90-120 parts of isopropanolamine, 105.6-140.8 parts of ethylene oxide and 1.96-2.61 parts of auxiliary agent.
6. The method of claim 3, wherein the synthesis of diethanol monoisopropanolamine comprises the following steps: the auxiliary agent comprises the following raw materials in parts by weight: 20-27 parts of sodium sulfate, 122-164.7 parts of activated carbon powder and 41-55 parts of water.
7. The method as claimed in claim 3, wherein the particle size of the activated carbon powder is 600-840 mesh.
8. The method of claim 1, wherein the inert gas is nitrogen.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB825475A (en) * | 1958-05-30 | 1959-12-16 | Petrochemicals Ltd | Process for the production of alkanolamines |
| US20040068143A1 (en) * | 2002-10-07 | 2004-04-08 | Diwakar Garg | Process for producing alkanolamines |
| CN101314533A (en) * | 2008-07-03 | 2008-12-03 | 南京红宝丽股份有限公司 | Method for continuously producing high-efficiency concrete grinding aid |
| CN103936602A (en) * | 2014-04-02 | 2014-07-23 | 四川鑫统领建材科技有限公司 | Method for joint production of isopropanolamine |
| CN104230724A (en) * | 2014-09-02 | 2014-12-24 | 南京红宝丽醇胺化学有限公司 | Preparation method of diethylene monoisopropanolamine |
-
2022
- 2022-05-20 CN CN202210550179.2A patent/CN114890905A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB825475A (en) * | 1958-05-30 | 1959-12-16 | Petrochemicals Ltd | Process for the production of alkanolamines |
| US20040068143A1 (en) * | 2002-10-07 | 2004-04-08 | Diwakar Garg | Process for producing alkanolamines |
| CN101314533A (en) * | 2008-07-03 | 2008-12-03 | 南京红宝丽股份有限公司 | Method for continuously producing high-efficiency concrete grinding aid |
| CN103936602A (en) * | 2014-04-02 | 2014-07-23 | 四川鑫统领建材科技有限公司 | Method for joint production of isopropanolamine |
| CN104230724A (en) * | 2014-09-02 | 2014-12-24 | 南京红宝丽醇胺化学有限公司 | Preparation method of diethylene monoisopropanolamine |
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