Method for Synthesizing Polyaspartic Acid Using Maleic Anhydride and Ammonia

A technology of polyaspartic acid and maleic anhydride, which is applied in the field of preparation of high molecular polymers, can solve the problems of high viscosity of intermediates, low utilization rate of ammonia, etc., and achieves low production cost, increased reaction temperature, and prolonged reaction time. Effect

Active Publication Date: 2017-09-29
HEBEI THINK DO ENVIRONMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem that the present invention needs to solve is to provide a kind of method that adopts maleic anhydride and ammonia to synthesize polyaspartic acid, to solve the intermediate viscosity that exists in the traditional maleic anhydride method to prepare polyaspartic acid big, the problem of ammonia problems such as low utilization rate, while making the molecular weight of the prepared polyaspartic acid controllable

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1) Put 97kg of maleic anhydride into the closed reactor connected with the tail gas absorption device, close the tail gas absorption device, start stirring, heat up to make it melt, and after the maleic anhydride is completely melted, slowly feed it into the reactor 17kg of ammonia gas, control the pressure in the reactor to 0.15Mpa~0.2Mpa, control the reaction temperature at 100°C to carry out the substitution reaction, stop the substitution reaction when the pressure in the reactor no longer drops, and open the tail gas absorption device to absorb the remaining gas; Adding 15kg mass fraction is 30% sodium hydroxide solution for neutralization reaction, controlling the reaction temperature to be 100°C, and after reacting for 0.5 hours, a mixture of sodium maleamate and ammonium maleamate is obtained;

[0031] 2) The temperature of the product in step 1) was directly raised to 200°C, and the polycondensation reaction was carried out under stirring. The polycondensation r...

Embodiment 2

[0035] 1) Put 97kg of maleic anhydride into the closed reactor connected with the tail gas absorption device, close the tail gas absorption device, start stirring, heat up to make it melt, and after the maleic anhydride is completely melted, slowly feed it into the reactor 17kg of ammonia gas, control the pressure in the reactor to 0.15Mpa~0.2Mpa, control the reaction temperature at 100°C to carry out the substitution reaction, stop the substitution reaction when the pressure in the reactor no longer drops, and open the tail gas absorption device to absorb the remaining gas; Adding 33kg mass fraction is 30% sodium hydroxide solution to carry out neutralization reaction, control reaction temperature is 100 ℃, after reacting for 1 hour, obtain the mixture of sodium maleamate and ammonium maleamate;

[0036]2) The temperature of the product in step 1) is directly raised to 220°C, and the polycondensation reaction is carried out under stirring. The polycondensation reaction time is...

Embodiment 3

[0040] 1) Put 97kg of maleic anhydride into the closed reactor connected with the tail gas absorption device, close the tail gas absorption device, start stirring, heat up to make it melt, and after the maleic anhydride is completely melted, slowly feed it into the reactor 17kg of ammonia gas, control the pressure in the reactor to 0.15Mpa~0.2Mpa, control the reaction temperature at 100°C to carry out the substitution reaction, stop the substitution reaction when the pressure in the reactor no longer drops, and open the tail gas absorption device to absorb the remaining gas; Adding 48kg mass fraction is 30% sodium hydroxide solution to carry out neutralization reaction, control reaction temperature is 100 ℃, after reacting for 1 hour, obtain the mixture of sodium maleamate and ammonium maleamate;

[0041] 2) The temperature of the product in step 1) was directly raised to 240°C, and the polycondensation reaction was carried out under stirring. The polycondensation reaction time...

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Abstract

The invention relates to a method for synthesizing polyaspartic acid by using maleic anhydride and ammonia gas. The molten maleic anhydride and ammonia gas are subjected to a substitution reaction in a closed reactor. After the substitution reaction is completed, the remaining gas is absorbed; Sodium solution, carry out neutralization reaction to obtain a mixture of sodium maleamate and ammonium maleamate; directly heat up the product in a closed reactor, and carry out polycondensation reaction under stirring. After the polycondensation reaction is completed, evaporate the water to obtain polysuccinate imide solid; add water to another reaction kettle, start stirring, add polysuccinimide solid, slowly add sodium hydroxide solution, heat up for hydrolysis reaction, and obtain polyaspartic acid solution; the present invention simplifies production The weight average molecular weight of the obtained polyaspartic acid is 2000-15000, and the molecular weight distribution index is 1.5-1.65, which can meet the molecular weight requirements of different application fields, and the production process is environmentally friendly.

Description

technical field [0001] The invention belongs to the field of high molecular polymer preparation, in particular to a method for synthesizing polyaspartic acid with different molecular weights by using maleic anhydride and ammonia. Background technique [0002] Polyaspartic acid (PASP) is a kind of amino acid with a linear polyamide structure and molecular chains of α and β types. Because the molecular chain contains peptide bonds, it is easily degraded into CO by microorganisms and bacteria. 2 and H 2 O, so it has good biocompatibility, and has properties such as scale inhibition, corrosion inhibition, chelation, adsorption, dispersion and moisture retention. The molecular chain structure of PASP is as follows: [0003] . [0004] The process of synthesizing PASP is mainly to prepare the intermediate polysuccinimide (PSI), then hydrolyze the PSI to generate the crude product PASP, and finally obtain PASP through separation and purification. According to the raw materials...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G73/10
Inventor 唐量
Owner HEBEI THINK DO ENVIRONMENT CO LTD
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