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Preparation method for macroporous weak-acidic cation exchange resin

A cation exchange and weakly acidic technology, which is applied in the field of preparation of macroporous weakly acidic cation exchange resins, can solve the problems that the weak acid exchange capacity of weak acid resins cannot reach 11mmol/g, the resin cannot be pure white, and it is not easy for customers to accept, etc. Achieve low cost, improve utilization rate, and reduce environmental pollution

Inactive Publication Date: 2011-09-21
周家付
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] If adopting methyl acrylate as the production process of raw material, its shortcoming is exactly that the weak acid exchange capacity of the weak acid resin finally obtained can't reach 11mmol / g, can't satisfy customer's requirement; If adopt acrylonitrile as polymerization monomer, the weak acid exchange capacity of final product can be It meets the standard, but the appearance of the product is milky yellow or yellow beads, which cannot achieve the goal of pure white resin, and is not easy to be accepted by customers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Weigh 73.6g of acrylic acid, 9.1g of divinylbenzene 9.1g of 55% by weight, 3.1g of triallyl isocyanurate; weigh 17g of toluene, weigh 0.5g of benzoyl peroxide and 0.5g of azo Diisobutyronitrile is an initiator, mixed to obtain an oil phase;

[0022] Weigh 1g of cellulose, 360g of anhydrous calcium chloride, dissolve in 440g of water, and obtain the water phase;

[0023] Put the oil phase into the water phase, turn on the agitator, and when the particle size of the oil beads is 0.4-1.2mm, start to heat up slowly, and react at a constant temperature when it reaches 70°C, and the heating rate is 0.5°C / min; continue the heat preservation reaction at this temperature for 5 After that, raise the temperature to 80°C at the same heating rate, and then react at constant temperature for 2 hours; then raise the temperature to 90°C at the same heating rate, react at constant temperature for 2 hours, and finally rise to 97°C, keep the temperature at constant temperature for 8 hours,...

Embodiment 2

[0025] Weigh 49.1g of acrylic acid, 29.31g of methyl acrylate, 6.3g of 80% divinylbenzene by weight, 3.1g of triallyl isocyanurate; weigh 15g of toluene, and weigh 0.5g of benzoyl peroxide Acyl and 0.5g azobisisobutyronitrile are initiators, mixed to obtain an oil phase;

[0026] Weigh 1g of cellulose, 360g of anhydrous calcium chloride, dissolve in 440g of water, and obtain the water phase;

[0027] Put the oil phase into the water phase, turn on the agitator, and when the particle size of the oil beads is 0.4-1.2mm, start to heat up slowly, and react at a constant temperature when it reaches 70°C, and the heating rate is 0.5°C / min; continue the heat preservation reaction at this temperature for 5 After that, raise the temperature to 80°C at the same heating rate, and then react at constant temperature for 2 hours; then raise the temperature to 90°C at the same heating rate, react at constant temperature for 2 hours, and finally rise to 97°C, keep the temperature at constant ...

Embodiment 3

[0031] Take by weighing 47.3g of acrylic acid, 28.2g of methyl acrylate, 8.8g of divinylbenzene 80% by weight, 3.5g of triallyl isocyanurate; weigh 15g of toluene, weigh 0.5g of benzoyl peroxide Acyl and 0.5g azobisisobutyronitrile are initiators, mixed to obtain an oil phase;

[0032] Weigh 1g of cellulose, 360g of anhydrous calcium chloride, dissolve in 440g of water, and obtain the water phase;

[0033] Put the oil phase into the water phase, turn on the agitator, and when the particle size of the oil beads is 0.4-1.2mm, start to heat up slowly, and react at a constant temperature when it reaches 70°C, and the heating rate is 0.5°C / min; continue the heat preservation reaction at this temperature for 5 After that, raise the temperature to 80°C at the same heating rate, and then react at constant temperature for 2 hours; then raise the temperature to 90°C at the same heating rate, react at constant temperature for 2 hours, and finally rise to 97°C, keep the temperature at con...

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PUM

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Abstract

The invention discloses a preparation method for macroporous weak-acidic cation exchange resin, which comprises the following steps of: carrying out suspension polymerization in a calcium chloride aqueous solution by using acrylic acid to partially substitute for methyl acrylate and acrylonitrile and by using toluene and gasoline as pore forming agents, washing with water after polymerization, washing with methanol to remove the pore forming agents, and hydrolyzing in a NaOH aqueous solution to obtain the macroporous weak-acidic cation exchange resin. The macroporous weak-acidic cation exchange resin prepared by the preparation method provided by the invention has a weak acid exchange capability higher than 11 mmol / g and is pure white. The preparation method provided by the invention has the advantages of no need for hydrolysis to remove alcohol groups, low cost of acrylic acid, simple process, recyclable water phase calcium chloride aqueous solution, low cost, low environmental pollution, etc.

Description

technical field [0001] The invention relates to a preparation method of macroporous weakly acidic cation exchange resin. Used in chemical industry. Background technique [0002] Macroporous weakly acidic acrylic cationic resin is mainly used in water treatment and has a large market share. At present, there are two main production processes used by resin companies. One is to use primary or secondary polymerized polymethyl acrylate as white balls, which are obtained by hydrolysis Macroporous weak acid resin; another technique is to use acrylonitrile as a monomer to prepare macroporous white balls, and then hydrolyze to obtain macroporous weak acid resin. [0003] If adopting methyl acrylate as the production process of raw material, its shortcoming is exactly that the weak acid exchange capacity of the weak acid resin finally obtained can't reach 11mmol / g, can't satisfy customer's requirement; If adopt acrylonitrile as polymerization monomer, the weak acid exchange capacity ...

Claims

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Application Information

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IPC IPC(8): C08F220/06C08F220/14C08F2/20C08F8/12C08J9/14B01J39/20
Inventor 周家付
Owner 周家付
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