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A kind of preparation method of chelating agent

A chelating agent and reactor technology, which is applied in the field of chelating agent preparation, can solve the problems of high temperature resistance, etc., and achieve the effects of strong chelating force, good flocculation and sedimentation effect, and good temperature stability

Active Publication Date: 2018-10-23
绍兴市柯桥区科创高新技术开发中心
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a preparation method of a chelating agent, which can prepare a chelating agent for pretreatment of printing and dyeing, and can overcome the defects of existing chelating agents that produce silicon scale and are not resistant to high temperatures

Method used

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Examples

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Effect test

Embodiment 1

[0020] A kind of preparation method of chelating agent, each raw material is measured in mass parts, comprises the following steps:

[0021] a. Dissolve 12 parts of maleimide in 35 parts of deionized water and 0.2 part of sodium persulfate in 25 parts of deionized water to form a solution for later use;

[0022] b. Put 24 parts of maleic anhydride and 126 parts of deionized water into the reactor, stir, dissolve, and heat up to 72°C;

[0023] c. Within 2 hours, drop maleimide, sodium persulfate aqueous solution, and 18 parts of acrylic acid into the reactor of step b, and then keep the reaction at 78° C. for 1 hour after the dropwise addition;

[0024] d. The temperature of the reactor is lowered to 30°C, firstly add 5 parts of sodium hydroxide, after dissolving, then add 10 parts of carbon disulfide, react for 3 hours, and filter to obtain the chelating agent. The degree of polymerization was 700.

Embodiment 2-4

[0026] Adopt the same preparation steps and process as in Example 1, only change the input amount of raw materials such as maleimide, maleic anhydride, acrylic acid, the proportioning ratio of each raw material is as follows in Table 1, the degree of polymerization of Examples 2-4 600, 800, 700 respectively.

[0027] Table 1 Ratio of each raw material

[0028]

[0029] Weigh an appropriate amount of lead nitrate and copper sulfate respectively, and configure 4000mL of solutions with a concentration of 100mg / L with purified water. For related products, stir at 200 rpm for 3 minutes, stir at 100 rpm for 5 minutes, let stand for 20 minutes, take the supernatant to detect the concentration of residual metal ions C 1 , then metal ion removal rate = (C 0 -C 1 ) / C 0 *100%, C 0 = 100 mg / L.

[0030] Table 2 Chelating agent sample removes the effect of metal ion

[0031]

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Abstract

The invention relates to a preparation method of a chelating agent. The preparation method comprises steps as follows: 12-21 parts of maleimide is dissolved with 35 parts of deionized water, 0.2 parts of sodium persulfate is dissolved with 25 parts of deionized water, and solutions are formed for standby application; 24-36 parts of maleic anhydride and 126-184 parts of deionized water are added to a reactor, stirred, dissolved and heated to 72 DEG C; the maleimide and sodium persulfate aqueous solutions and 18-27 parts of acrylic acid are dropwise added to the reactor within 2h, a mixed solution is subjected to a heat preservation reaction for 1h at the temperature of 78 DEG C after dropwise addition; the temperature of the reactor is reduced to 30 DEG C, 5 parts of sodium hydroxide and 10 parts of carbon disulfide are added firstly, a mixture reacts for 3 h and is filtered, and the chelating agent is obtained. The chelating agent contains stronger polar groups and has good removing performance on heavy metal ions.

Description

technical field [0001] The invention relates to a preparation method of a chelating agent, which belongs to the field of metal ion chelating agents. Background technique [0002] The chemical molecule not only has lone electron pairs available for coordination, but also can form a ring structure with the coordination metal ion. The metal ion replaces the hydrogen (or sodium) on the coordination atom and enters the chelation ring, making the metal ion passivation, forming a complex, this chemical molecule is called a chelating agent, and the formed complex is called a chelate. The chelating agents commonly used to chelate metal ions in the printing and dyeing industry include sodium silicate and condensed phosphate. However, sodium silicate is easy to cause silica scale, and condensed phosphate is not heat-resistant and unstable above 60°C. Contents of the invention [0003] The purpose of the present invention is to provide a preparation method of a chelating agent, which...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F222/06C08F222/40C08F220/06C08F8/44B01J20/26B01J20/30C02F1/28C02F1/62
CPCB01J20/265C02F1/28C02F2101/20C08F8/44C08F222/06C08F222/40C08F220/06
Inventor 张演章勇坚
Owner 绍兴市柯桥区科创高新技术开发中心
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