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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 Defects such as poor scale inhibition performance and unstable performance

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

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Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

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

specific Embodiment approach 2

[0009] Specific embodiment 2: In this embodiment, the aspartic acid-citric acid copolymer is prepared 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; a catalyst is added to the reactant and solvent; using microwave technology, under the conditions of microwave frequency 2450±50MHz and microwave power 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 is hydrolyzed. The aspartic acid-citric acid copolymer is obtained, wherein the ratio of the stoichiometric number of the catalyst to the reactant is 0.01-1.00, and the ratio of the stoichiometric number of the solvent to the reactant is 0.10-5.00.

[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...

specific Embodiment approach 3

[0011] Specific implementation mode three: take 0.2mol of reaction raw materials in total, wherein aspartic acid 23.958g, citric acid 4.2028g, solvent is 15mL, the ratio of the stoichiometric number of catalyst / raw material is 0.1, and the reaction phenomena under different reaction conditions are included in in FIG. 1.

[0012] Table 1 Experimental phenomena under different reaction systems

[0013]

[0014] As can be seen from Table 1: aspartic acid and citric acid do not react under solvent-free and catalyst conditions; the two are in organic solvents without catalyst, the reaction is incomplete, and the productive rate is low; , and in an organic solvent, a satisfactory yield and a product with good performance can be obtained.

[0015] Specific embodiment four: get reaction raw material by the ratio of the stoichiometric number of citric acid in table 2 and aspartic acid, raw material adds up to 0.2mol; Add three-necked flat-bottomed flask, with NaH 2 PO 4 2H 2 O i...

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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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