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Method for preparing 40% sodium polyaspartate aqueous solution

A technology of polyaspartic acid sodium and saline solution, which is applied in the field of polyaspartic acid preparation, and can solve the problems of less application and complicated process

Inactive Publication Date: 2014-02-05
YANTAI HENGYUAN BIOENGINEERING CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The first method is complicated in process and uses highly toxic gas phosgene, so it is rarely used in practice

Method used

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  • Method for preparing 40% sodium polyaspartate aqueous solution
  • Method for preparing 40% sodium polyaspartate aqueous solution
  • Method for preparing 40% sodium polyaspartate aqueous solution

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Embodiment Construction

[0016] For further illustrating the present invention, specifically illustrate in conjunction with following examples:

[0017] 1 Formation reaction of polysuccinimide

[0018] 1) Catalyst

[0019] Polyaspartic acid (salt) can also be prepared under non-catalytic conditions, but in actual production, catalysts are usually added to speed up the reaction speed and shorten the reaction time, and at the same time inhibit the occurrence of side reactions to reduce the generation of by-products. Reduce product color. In addition, studies have shown that the use of catalyst polymerization may also improve the biodegradability of the product. The catalysts used in different raw material routes are similar, and a wide range of catalysts can be selected. Phosphoric acid is the catalyst used earlier, but when it was used in the early stage, the amount of phosphoric acid was large, and even the raw materials were dissolved in a large amount of phosphoric acid for reaction, which not on...

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Abstract

The invention relates to a method for preparing a 40% sodium polyaspartate aqueous solution. The method comprises the following steps: adding 10kg of H3PO4 into each ton of L-aspartic acid, reacting for 1.5 hours at the temperature of 200-220 DEG C, washing a catalyst after the reaction product is cooled, and centrifuging to obtain polysuccinimide; adding a sodium hydroxide solution, and hydrolyzing for a hour at the temperature of 50-60 DEG C, thereby obtaining the 40% sodium polyaspartate aqueous solution. According to research in multiple aspects such as influence of multiple catalysts and amounts, reaction temperatures and reaction time on synthesis of the polysuccinimide, influence of NaOH amount, reaction temperature and reaction time on hydrolysis of the polysuccinimide and extraction conditions of the polyaspartic acid, an optimal polyaspartic acid synthesis condition is determined.

Description

technical field [0001] The invention relates to a preparation method of polyaspartic acid. Background technique [0002] In the early 1990s, the "green" chemical polyaspartic acid (PASP) received a lot of attention. Polyaspartic acid is a degradable biopolymer substance with a polypeptide structure. It occurs in nature in the shells of molluscs and is used to regulate calcium balance in organisms. In recent years, people have successfully synthesized this biopolymer material inspired by the metabolism of such animals. In addition to the properties of general water-soluble carboxylic acids, polyaspartic acid also has excellent characteristics that many other polymers cannot match. The biggest feature of polyaspartic acid is that it is biodegradable, non-toxic, does not damage the ecological environment, and can be completely degraded into end products that are harmless to the environment. Experiments have confirmed that the degradation rate of polyaspartic acid can reach ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G73/10C02F5/12
Inventor 马玉岳姜国政姜增妍
Owner YANTAI HENGYUAN BIOENGINEERING CO LTD
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