Method for catalytic synthesis of polyaspartic acid by using imidazole type ionic liquid

A technology of polyaspartic acid and ionic liquids, applied in chemical instruments and methods, descaling and water softening, bulk chemical production, etc., can solve problems such as difficult product separation process, high reaction temperature, and low yield. To achieve the effect of facilitating mass transfer and heat transfer, simple processing process, and enhanced thermal stability

Inactive Publication Date: 2011-11-23
HEILONGJIANG UNIV
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Problems solved by technology

[0003] The present invention aims to solve the technical problems of low yield, high reaction temperature and difficult product separation process in the existing method for synthesizing polyaspartic acid using chloroaluminate-type ionic liquid as a reaction solvent, and provides a method using imidazole ions Liquid-catalyzed method for synthesizing polyaspartic acid

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  • Method for catalytic synthesis of polyaspartic acid by using imidazole type ionic liquid
  • Method for catalytic synthesis of polyaspartic acid by using imidazole type ionic liquid
  • Method for catalytic synthesis of polyaspartic acid by using imidazole type ionic liquid

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specific Embodiment approach 1

[0008] Specific embodiment one: a kind of method of utilizing imidazoles ionic liquid to catalyze the synthesis of polyaspartic acid of the present embodiment is carried out in the following steps: one, the mass ratio by imidazoles ionic liquid and L-aspartic acid is 1: Weigh the imidazole ionic liquid and L-aspartic acid at a ratio of 0.25 to 1.5, add them into a container with a stirring device, and raise the temperature to 145°C to 158°C under stirring conditions and keep it for 0.5h to 6h to obtain polysuccinyl A mixed liquid of imine and ionic liquid; 2. Cool the mixed liquid of polysuccinimide and ionic liquid obtained in step 1 to 15°C to 30°C, add deionized water under stirring, and solids are precipitated, pumped The solid is separated by filtration, and then washed with deionized water to obtain polysuccinimide; 3. The polysuccinimide obtained in step 4 is completely dissolved with an aqueous sodium hydroxide solution with a mass concentration of 10% to 50%, and then ...

specific Embodiment approach 2

[0011] Embodiment 2: This embodiment differs from Embodiment 1 in that: in step 1, the mass ratio of imidazole-based ionic liquid to L-aspartic acid is 1:0.30-1.2. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0012] Embodiment 3: The difference between this embodiment and Embodiment 1 is that the mass ratio of imidazole-based ionic liquid to L-aspartic acid in step 1 is 1:0.8. Others are the same as in the first embodiment.

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Abstract

The invention discloses a method for catalytic synthesis of polyaspartic acid by using imidazole type ionic liquid, relates to a method for synthesizing the polyaspartic acid, and solves the technical problems of low yield, difficult product separation process and high reaction temperature existing in the conventional method for synthesizing the polyaspartic acid by using chloroaluminate type ionic liquid as a reaction solvent. The method comprises the following steps of: adding the imidazole type ionic liquid and L-aspartic acid into a container; heating to 145-158 DEG C and preserving the heat for 0.5-6 hours to obtain mixed liquid of polysuccinimide and the ionic liquid; cooling the mixed liquid and then adding deionized water to separate the polysuccinimide out; washing the polysuccinimide and then dissolving the polysuccinimide by using a sodium hydroxide aqueous solution; adjusting pH value to be 3.0-3.5 by using hydrochloric acid; precipitating with ethanol to obtain polyaspartic acid precipitate; and filtering and drying to obtain the polyaspartic acid. The yield of the polyaspartic acid is 50-70 percent. The method can be used for synthesizing the polyaspartic acid serving as a water treatment scale inhibitor.

Description

technical field [0001] The present invention relates to a method for synthesizing polyaspartic acid. Background technique [0002] Polyaspartic acid is an updated product of scale inhibitor and dispersant. The synthesis of polyaspartic acid by liquid phase polymerization has the advantages of uniform reaction, low synthesis temperature, short reaction time, and high molecular weight of the product. However, the organic solvents used in traditional liquid phase polymerization have the disadvantages of poor solubility to L-aspartic acid, no catalytic performance, easy volatilization, and poor thermal stability. The existing synthesis of polyaspartic acid using chloroaluminate-type ionic liquid as a reaction solvent improves the solubility of the reaction monomer and the catalytic performance of the polymerization reaction, but the yield of the synthetic product is low, only 30%. ~40%. At the same time, because the ionic liquid reacts with water, the reaction process needs to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G73/10C02F5/12
CPCY02P20/54
Inventor 杨士林高倩
Owner HEILONGJIANG UNIV
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