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Method for preparing poly aspartic acid

A technology of polyaspartic acid and aspartic acid, which is applied in the field of preparation of polyaspartic acid, and can solve problems such as difficult control of the reaction process

Inactive Publication Date: 2005-03-30
SINOPEC SHANGHAI PETROCHEMICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The invention provides a method for preparing polyaspartic acid from aspartic acid. The technical problem to be solved is that when aspartic acid undergoes polycondensation reaction in the presence of a catalyst, the reaction material adheres to the polyaspartic acid due to the sharp increase in molecular weight Accumulated on the inner wall of the reactor and the stirring paddle, causing the problem that the reaction process is difficult to control

Method used

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  • Method for preparing poly aspartic acid
  • Method for preparing poly aspartic acid

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Embodiment 1～10

[0022] Mix the aspartic acid and the catalyst evenly and then add water to prepare a slurry. The catalysts used in each embodiment and the proportion of the slurry are listed in Table 1.

[0023] Put the above slurry on an enamel flat plate and spread it into a thin layer, the layer thickness is controlled at 0.5-4mm, put it in an oven, control the required temperature to carry out the pre-condensation reaction, after 0.5-3 hours of reaction, the pre-condensation stage is over, and the material It is dry and solid.

[0024] Take out the dry solid reactants obtained by precondensation, crush and grind them into fine particles, and then put them into a rotary evaporator or a stirred tank reactor and heat them in an oil bath for solid phase polycondensation reaction. After 1 to 4 hours of reaction, intermediate The product polysuccinimide. The specific precondensation reaction temperature, polycondensation reaction temperature and conversion rate of aspartic acid of each embodim...

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Abstract

A process for preparing the polyaspartic acid from aspartic acid includes proportionally mixing aspartic acid with the catalyst chosen from phosphoric acid, phosphorus acid, sulfuric acid, sodium hydrogen sulfate, etc, adding water, preparing slurry, spreading to become a thin layer, prepolycondensating reaction at 170-270 deg.C for 0.5-3 hr, pulverizing the solid resultant, stirring for solid-phase polycondensating reaction at 170-270 deg.C for 1-4 hr to obtain polysuccinimide, and alkaline hydrolyzing at 25-90 deg.C.

Description

technical field [0001] The invention relates to a preparation method of polyaspartic acid. Background technique [0002] Polyaspartic acid is an environmentally friendly, non-toxic, and biodegradable amino acid polymer. It has a strong chelating ability for alkaline earth metal ions such as calcium and magnesium, and can be used as a scale inhibitor for cooling water treatment. , boiler water treatment, reverse osmosis membrane and oil field recovery water treatment. In addition, polyaspartic acid can also be used as a dispersant in detergents, pigments, and coatings, and can also be directly applied to the soil as a fertilizer, or used together with other fertilizers as a nutrient accelerator. Both agricultural and civil fields have wide application value. [0003] In the prior art, the preparation of polyaspartic acid generally has two process routes using aspartic acid or maleic anhydride as raw materials. In the process of using aspartic acid as the starting material,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G69/14
Inventor 薛丹青鲍其鼐张洪宇徐江峰
Owner SINOPEC SHANGHAI PETROCHEMICAL CO LTD