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Method for synthesizing polyaspartic acid derivatives by modifying multicomponent coprecipitation

A technology of polyaspartic acid and aspartic acid, applied in chemical instruments and methods, water/sludge/sewage treatment, descaling and water softening, etc., can solve high reaction temperature, uneven reaction, scale inhibition Poor performance and other problems, to achieve the effect of uniform reaction, excellent scale inhibition performance, and reduce crystallinity

Inactive Publication Date: 2010-11-10
HEILONGJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of high reaction temperature, high energy consumption, uneven reaction and poor scale inhibition performance in the existing method for synthesizing polyaspartic acid by solid-phase thermal shrinkage polymerization, and provides a multi-component co-precipitation Method for modifying and synthesizing polyaspartic acid derivatives

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  • Method for synthesizing polyaspartic acid derivatives by modifying multicomponent coprecipitation

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specific Embodiment approach 1

[0008] Specific embodiment one: the method for synthesizing polyaspartic acid derivatives by multi-component co-precipitation modification of the present embodiment is realized according to the following steps: one, by stoichiometric number ratio 0.5~0.99: 0.01~0.5 aspartic acid and Mix glutamic acid, then add hydrochloric acid with a volume concentration of 50% to adjust the pH value until the solid precipitates, and after suction filtration, place it at 120°C and dry to constant weight to obtain a co-precipitation product; 2. Take 5.0g of the co-precipitation product and add 100ml In a three-neck flask, place the reaction at a temperature of 180-230°C and a stirring speed of 80-120r / min for 1-10 hours to obtain a polysuccinimide derivative; 3. Cool the polysuccinimide derivative to room temperature, add a sodium hydroxide solution with a concentration of 0.5mol / L to the pH value of 10-12, then add hydrochloric acid with a volume concentration of 50% to adjust the pH value to ...

specific Embodiment approach 2

[0012] Embodiment 2: The difference between this embodiment and Embodiment 1 is that aspartic acid and glutamic acid are mixed according to the stoichiometric ratio of 0.5:0.5 in Step 1. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0013] Embodiment 3: The difference between this embodiment and Embodiment 1 is that aspartic acid and glutamic acid are mixed according to the stoichiometric ratio of 0.99:0.01 in Step 1. Other steps and parameters are the same as those in Embodiment 1.

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Abstract

The invention provides a method for synthesizing polyaspartic acid derivatives by modifying multicomponent coprecipitation, which relates to a method for synthesizing polyaspartic acid derivatives. The invention solves the problems that traditional method for synthesizing polyaspartic acid derivatives by solid phase pyrocondensation polymerization has high reaction temperature, large energy consumption, uneven reaction and poor scale inhibition property. The method comprises the following steps of: first, mixing aspartic acid with glutamic acid, adding hydrochloric acid to adjust the pH value and separate the solid out, filtering and drying to constant weight to obtain coprecipitation product; second, reacting the coprecipitation product to obtain polysuccinimide derivatives; and third, cooling the polysuccinimide derivatives to room temperature, adjusting the pH, then extracting with absolute ethyl alcohol, and finally drying to constant weight. By using the invention, the reaction temperature of traditional solid phase pyrocondensation polymerization is reduced by 10-80 DEG C, the energy consumption is reduced and the reaction is even. The scale inhibition ratio of the obtained polyaspartic acid derivatives is 96%-96.7% and increased by 7.8%-8.6%, compared with the traditional solid phase polymerization method under the same condition.

Description

technical field [0001] The present invention relates to a method for synthesizing polyaspartic acid derivatives. Background technique [0002] Polyaspartic acid (polyaspartic acid) is a water-soluble amino acid polymer with carboxylic acid side chains, referred to as PASP, and is an environmentally friendly water treatment agent with good scale inhibition performance. The method for synthesizing polyaspartic acid by using L-aspartic acid as a raw material by solid-state heat shrinkage polymerization has the advantages of non-toxic reactants, no pollution in the reaction process, high yield, simple process and the like. However, L-aspartic acid has a crystal structure, and the large particles and dense structure of the reactants lead to high solid-phase reaction temperature (240°C-260°C), high energy consumption, and uneven reaction, which ultimately affect polyaspartic acid. Antiscalant properties of acid. Contents of the invention [0003] The purpose of the present inv...

Claims

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Application Information

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IPC IPC(8): C08G73/10C02F5/12
Inventor 杨士林王海棠
Owner HEILONGJIANG UNIV