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Method for separating sulfuric acid in hydrolyzate of ion exchange resin and collecting and recycling acid

A technology of ion exchange resin and hydrolyzate, applied in the direction of ion exchange, cation exchange, organic cation exchanger, etc., can solve the problems of large discharge of production waste, affecting production operation, troublesome waste water treatment, etc., saving environmental protection treatment costs, The effect of reducing the breaking rate and improving the quality

Inactive Publication Date: 2019-02-01
扬州金珠树脂有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A large amount of 60% sulfuric acid solution will be used during the hydrolysis reaction, and a certain amount of ammonium sulfate will be produced in the sulfuric acid solution after the hydrolysis reaction. If this mixed hydrolyzed sulfuric acid solution is discharged at one time, it will cause a large amount of production waste. Unfavorable factors such as high expenses and rising production costs
As a result, it not only causes a large waste of resources, but also makes wastewater treatment very troublesome, and even affects normal production and operation. How to make comprehensive utilization of waste acid and reduce waste is an important issue that must be properly solved in this process.

Method used

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  • Method for separating sulfuric acid in hydrolyzate of ion exchange resin and collecting and recycling acid
  • Method for separating sulfuric acid in hydrolyzate of ion exchange resin and collecting and recycling acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The macroporous weak acid acrylic ion exchange resin hydrolyzed material is placed in the dilution kettle, filtered through the filter screen into the hydrolyzed liquid collection storage tank, containing sulfuric acid and ammonium sulfate, it is a mixed hydrolyzed liquid, the concentration of sulfuric acid is generally 45~ 48.0%.

[0029] (1) The hydrolyzate in the storage tank was pumped into the reaction kettle with an acid pump, and the chilled brine was turned on for stirring and cooled through the jacket, so that the temperature in the reaction kettle was 5°C, the stirring was stopped, and the crystallization was concentrated for 4h;

[0030] (2) after the lower layer is completely crystallized, the upper layer sulfuric acid liquid is added to the special recovery sulfuric acid header tank with an acid pump, and the purified rear sulfuric acid liquid is for subsequent use;

[0031] (3) the reaction kettle is heated to 70 ℃ through the jacket, after the ammonium su...

Embodiment 2

[0039] The macroporous weak acid acrylic ion exchange resin hydrolyzed material is placed in the dilution kettle, filtered through the filter screen into the hydrolyzed liquid collection storage tank, containing sulfuric acid and ammonium sulfate, it is a mixed hydrolyzed liquid, the concentration of sulfuric acid is generally 45~ 48.0%.

[0040] (1) The hydrolyzate in the storage tank was pumped into the reaction kettle with an acid pump, and the chilled brine was turned on for stirring and cooled through the jacket, so that the temperature in the reaction kettle was 8°C, the stirring was stopped, and the crystallization was concentrated for 5h;

[0041] (2) after the lower layer is completely crystallized, the upper layer sulfuric acid liquid is added to the special recovery sulfuric acid header tank with an acid pump, and the purified rear sulfuric acid liquid is for subsequent use;

[0042] (3) the reaction kettle is heated to 75 ℃ through the jacket, after the ammonium su...

Embodiment 3

[0050] Put the hydrolyzed material of macroporous weakly acidic acrylic ion exchange resin into the dilution tank, and filter it through the filter screen into the hydrolyzate collection storage tank. It contains sulfuric acid and ammonium sulfate, which is a mixed hydrolyzate. The concentration of sulfuric acid is generally 45~ 48.0%.

[0051] (1) Pump the hydrolyzate in the storage tank into the reaction kettle with an acid pump, start stirring, and use frozen brine to cool through the jacket, so that the temperature in the reaction kettle is 10°C, stop stirring, and carry out crystallization and concentration for 6 hours;

[0052] (2) After the lower layer is completely crystallized, add the upper strata sulfuric acid solution into the special recovery sulfuric acid head tank with an acid pump, and obtain the purified sulfuric acid solution for subsequent use;

[0053] (3) The reaction kettle is heated to 80°C through the jacket, and after the ammonium sulfate crystals are ...

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Abstract

The invention relates to the technical field of ion exchange resin production and particularly relates to a method for separating sulfuric acid in a hydrolyzate of an ion exchange resin and collectingand recycling the acid. The method comprises: recovering a hydrolyzate used in the preparation process of the ion exchange resin, cooling the hydrolysate through chilled brine under stirring, carrying out crystallization concentration to obtain ammonium sulfate, after the liquid in the lower layer is completely crystallized, recovering a sulfuric acid solution in the upper layer, heating a reactor so that the ammonium sulfate crystals are fully dissolved and the ammonium sulfate solution is recovered, carrying out later performance tests through the separated and purified sulfuric acid solution, preparing a hydrolysate from the purified sulfuric acid solution, adding macroporous acrylic white balls into the hydrolysate for a hydrolysis reaction, then carrying out acid collection and dilution, and washing the acid until pH of 3-4 so that a resin product is obtained. The method reduces acid consumption and waste acid emission, realizes the requirements of clean production and resource recycling, and has broad application prospects.

Description

technical field [0001] The invention relates to the technical field of ion exchange resin production, in particular to a method for separating and reusing sulfuric acid in ion exchange resin hydrolyzate. Background technique [0002] In recent years, many academic groups at home and abroad have carried out research in the field of resins. These studies are mainly to synthesize acrylic polymer copolymers by changing the types and proportions of monomers, crosslinking agents and porogens. Liquid hydrolysis can obtain weakly acidic ion exchange resin containing carboxyl groups. This type of resin has the advantages of high exchange capacity and excellent performance. At present, it has a large output and a wide variety, also known as the second-generation weakly acidic acrylic resin, and its performance is superior. , instead of the weak acid resin produced by the first generation of methyl acrylate. [0003] The macroporous weakly acidic acrylic cation exchange resin is prepa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J39/07B01J39/16
CPCB01J39/16B01J39/07
Inventor 阮圣如陈必玉张雪峰吉霞卢浩李玉琴
Owner 扬州金珠树脂有限公司
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