Aspartic acid-citric acid copolymer and preparation method thereof

A technology of aspartic acid and citric acid, used in chemical instruments and methods, water/sludge/sewage treatment, descaling and water softening, etc., can solve the problems of poor scale inhibition performance and unstable performance, and achieve product The effect of stable performance, fast response speed and simple production process

Inactive Publication Date: 2015-03-11
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It overcomes the existing PASP to CaCO to a certain extent 3 Defect

Method used

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  • Aspartic acid-citric acid copolymer and preparation method thereof
  • Aspartic acid-citric acid copolymer and preparation method thereof
  • Aspartic acid-citric acid copolymer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0008] Specific embodiment 1: The structural formula of the aspartic acid-citric acid copolymer of this embodiment is: The range of y / (y+x) is 0.01-1.00, and the range of x+y is 4-150. The optimal range of y / (y+x) in this embodiment is 0.06-0.50, and the optimal range of x+y is 6-75.

Example Embodiment

[0009] Specific embodiment 2: This embodiment prepares aspartic acid-citric acid copolymer according to the following steps: citric acid and aspartic acid are used as raw materials, and the stoichiometric ratio is 0.01 to 1.00; catalyst is added to the reactants And solvent; using microwave technology, under the conditions of microwave frequency of 2450±50MHz and microwave power of 400~10000W, the intermediate can be obtained by radiation reaction for 1~30min. At this time, the solvent is recovered in gaseous state and the intermediate can be hydrolyzed. The aspartic acid-citric acid copolymer is obtained, wherein the stoichiometric ratio of the catalyst to the reactant is 0.01 to 1.00, and the stoichiometric ratio of the solvent to the reactant is 0.10 to 5.00.

[0010] In the preparation process, the reaction time will be shortened with the increase of power. Too short reaction time is not conducive to uniform reaction, so the reaction time is not less than 3min. Too high power ...

Example Embodiment

[0011] Embodiment 3: Take a total of 0.2 mol of the reaction raw materials, including 23.958g of aspartic acid, 4.2028g of citric acid, 15mL of solvent, and a stoichiometric ratio of catalyst / raw material of 0.1. The reaction phenomena under different reaction conditions are included in FIG. 1.

[0012] Table 1 Experimental phenomena under different reaction systems

[0013]

[0014] It can be seen from Table 1: Aspartic acid and citric acid do not react under the conditions of solvent and catalyst; the two are in an organic solvent without catalyst, the reaction is incomplete, and the yield is low; under catalyst conditions , And in organic solvents, can we get satisfactory yield and good performance products.

[0015] Specific embodiment four: according to the stoichiometric ratio of citric acid and aspartic acid in Table 2 to take the reaction raw materials, the total raw materials are 0.2 mol; add a three-necked flat-bottomed flask to NaH 2 PO 4 ·2H 2 O is the catalyst, the stoi...

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Abstract

The invention relates to an aspartic acid-citric acid copolymer and a preparation method thereof, and relates to a polyaspartic acid modified product capable of serving as a water treatment agent and a synthetic method of the polyaspartic acid modified product. The aspartic acid-citric acid copolymer aims to solve the defects that an existing polyaspartic acid modified product is complex in synthetic process, slow in reaction speed, unstable in product performance, low in CaCO3 scale inhibiting ratio and the like. The structural formula of the aspartic acid-citric acid copolymer is as shown in the description. The synthetic process comprises the following steps: using aspartic acid and citric acid as raw materials, under the microwave conditions of 865-965 MHz or 2400-2500 MHz and 400-10000 W, adding a small amount of catalyst and an appropriate amount of an organic solvent, radiating for 1-30 min, and synthetizing an intermediate, wherein the organic solvent is completely recycled in a gas form, and the aspartic acid-citric acid copolymer is obtained from the intermediate through basic hydrolysis. The aspartic acid-citric acid copolymer has the advantages of simple technology, high reaction speed, high yield, energy saving, little pollution, stable product performance and the like, and the scale inhibition effect of the product is obviously improved.

Description

Technical field: [0001] The invention relates to a polyaspartic acid derivative and a preparation method thereof, in particular to an aspartic acid-citric acid copolymer which can be used as a green water treatment agent and a preparation method thereof. Background technique: [0002] As a new environment-friendly water treatment agent, polyaspartic acid (PASP) has good scale and corrosion inhibition properties and biodegradability, and is widely used in industry and has broad development prospects. Since the 1990s, PASP has become the focus of attention in the field of water treatment chemicals. However, the application results of industrial circulating cooling water systems have proved that the inhibition of CaCO 3 and Ca 3 (PO 4 ) 2 When scaling, there is still a certain gap in the scale inhibition performance of PASP compared with some phosphorus-containing scale inhibitors, which largely limits its popularization and application. In order to further enhance the sca...

Claims

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Application Information

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IPC IPC(8): C08G69/08C02F5/12
Inventor 张玉玲王姣龙杨越尹连庆李伟赵彩霞
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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