Method for synthetizing polyaspartic acid by microwaves in ionic liquid

A technology of polyaspartic acid and ionic liquid, which is applied in the field of synthesis of polyaspartic acid, can solve the problems of poor scale inhibition effect, uneven temperature and long reaction time of synthetic products, and achieves improved scale inhibition effect and uniform heating. , the effect of fast heating

Inactive Publication Date: 2012-08-22
HEILONGJIANG UNIV
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Problems solved by technology

[0003] The present invention aims to solve the problems of long reaction time, uneven temperature, low reaction rate, large energy consumption and poor scale inhibition effect of the synthetic product when the conventional heating method is used to synthesize polyaspartic acid in the existing ionic liquid, and provides ionic liquid Method for Synthesizing Polyaspartic Acid by Medium Microwave

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  • Method for synthetizing polyaspartic acid by microwaves in ionic liquid
  • Method for synthetizing polyaspartic acid by microwaves in ionic liquid
  • Method for synthetizing polyaspartic acid by microwaves in ionic liquid

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specific Embodiment approach 1

[0019] Specific embodiment one: the method for microwave synthesis of polyaspartic acid in the ionic liquid in the present embodiment is realized through the following steps:

[0020] 1. Weigh N-methylimidazole and sulfuric acid solution respectively according to the ratio of mass volume ratio of 1g: (1.6~2) mL, then add N-methylimidazole into a three-necked flask with a mechanical stirring device and put it in ice Cool in a water bath to 0~5°C, then drop the sulfuric acid solution dropwise into the three-necked flask at a stirring speed of 2000~3000rpm. 2.2h, obtain mixture;

[0021] 2. Distill the mixture obtained in step 1 to remove moisture, the temperature of the vacuum distillation is 70~80°C, and the pressure of the vacuum distillation is 0.1~0.15atm to obtain the ionic liquid [Hmim]HSO 4 ;

[0022] 3. According to the mass ratio (1.0~1.8): 1, weigh L-Asp and [Hmim]HSO obtained in step 2 4 Put it into a beaker and stir evenly, then put the beaker into a microwave ove...

specific Embodiment approach 2

[0032] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that in step 1, N-methylimidazole and sulfuric acid solution are weighed according to the ratio of mass volume ratio of 1 g: (1.7~1.9) mL. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0033] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that in step one, the above-mentioned three-necked bottle is placed in an ice-water bath and cooled to 1~4°C, and the sulfuric acid solution is Drop by drop into the three-neck bottle. Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention discloses a method for synthetizing polyaspartic acid by microwaves in ionic liquid and relates to a method for synthetizing the polyaspartic acid. The invention aims to solve the problems that the scale inhibition effect of a synthetic product is not good in the synthesis method of the polyaspartic acid in traditional ionic liquid. The method for synthetizing the polyaspartic acid by the microwaves in the ionic liquid comprises the following steps of: I-, preparing the ionic liquid; II-, polymerizing; III-, performing hydrolysis reaction; and IV-, performing precipitation drying. The invention provides a novel method for synthetizing the polyaspartic acid, which is high in reaction rate and short in reaction time. The scale inhibition efficiency on CaCO3 reaches 96.77 percent. Compared with a traditional liquid polymerization process, the scale inhibition efficiency is increased by 8 percent. The method for synthetizing the polyaspartic acid by the microwaves in the ionic liquid can be used for the field of cooling by using circulating water and boiler heating.

Description

technical field [0001] The invention relates to a method for synthesizing polyaspartic acid in an ionic liquid. Background technique [0002] Polyaspartic acid (PASP) is an environmentally friendly antiscalant. Its synthesis methods mainly include solid-phase thermal condensation polymerization and liquid-phase polymerization. The solvents are mostly organic solvents and ionic liquids. The monomer aspartic acid ( The liquid phase polymerization of L-Asp) in ionic liquid is a relatively new and advanced polymerization method. At present, the synthesis of polyaspartic acid in ionic liquids adopts a common heating method, and heat energy is transferred from the outside of the container to the inside of the ionic liquid through heat conduction. This method has a long heating time and uneven temperature, resulting in low reaction rate, high energy consumption, and poor scale inhibition effect of synthetic products. Contents of the invention [0003] The present invention aims...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G73/10C02F5/12
Inventor 杨士林孙哲曹瑞雪
Owner HEILONGJIANG UNIV
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