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A kind of preparation method of macroporous weakly acidic cation exchange resin

A cation exchange and weak acid technology, which is used in the preparation of macroporous weak acid cation exchange resins, can solve the problems of incomplete removal of porogens, pollution of toxic substances, large pores, etc., so as to reduce the pollution of porogens and reduce resin Effects of degradation, thermal stability and adsorption capacity enhancement

Active Publication Date: 2015-12-09
ANHUI SANXIN RESIN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The toxicity of porogens and degradation products, because the resin has a network structure and large pores, so people often worry that the porogens are not completely removed before use. In long-term use, the resin will degrade and cause toxic substances. pollution

Method used

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  • A kind of preparation method of macroporous weakly acidic cation exchange resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Weigh 2.5g acrylic acid 75g styrene, 10.6g divinylbenzene, 4.4g triallyl isocyanurate; weigh 1.5g polyvinylpyrrolidone 1.3g and polyurethane 0.7g as a mixed porogen, and weigh 0.5g of benzoyl peroxide and 0.5g of azobisisobutyronitrile as initiators, mixed to obtain an oil phase;

[0034] Weigh 1g of cellulose, 360g of anhydrous calcium chloride, and dissolve it in 500g of water to obtain an aqueous phase;

[0035] Put the oil phase into the water phase, turn on the stirrer, rotate 40-120 rpm, when the oil droplet size is 0.4-1.2mm, start to slowly increase the temperature, the heating rate is 2 ℃ / min; the temperature is 80-90 ℃ For the reaction, keep holding and reacting at this temperature for 3 hours, then increase the temperature to 100°C-110°C at the same heating rate, and react at a constant temperature for 1 hour; then increase the temperature to 115-120°C at the same heating rate, and react at a constant temperature After 0.5 hours, the temperature is raised to 12...

Embodiment 2

[0038] 1g of styrene, 49g of acrylic acid, 11g of methyl acrylate, 10g of 80% divinylbenzene by weight, 5g of triallyl isocyanurate; weigh 15g of polyvinylpyrrolidone 1.8 and polyurethane 1.29 for mixing Pore ​​agent, weigh 2g of benzoyl peroxide and 2g of azobisisobutyronitrile as initiators, and mix to obtain the oil phase;

[0039] Weigh 1g of cellulose, 400g of anhydrous calcium chloride, and dissolve in 500ml of water to prepare the water phase;

[0040] Put the oil phase into the water phase, turn on the stirrer, rotate 40-120 rpm, when the oil droplet size is 0.4-1.2mm, start to slowly increase the temperature, the heating rate is 2 ℃ / min; the temperature is 80-90 ℃ For the reaction, keep holding and reacting at this temperature for 3 hours, then increase the temperature to 100℃-110℃ at the same heating rate, and then react at a constant temperature for 1 hour; then increase the temperature to 115-120℃ at the same heating rate, and react at a constant temperature After 0....

Embodiment 3

[0041] Weigh 3g of styrene, 51.8g of acrylic acid, 28.2g of methyl acrylate, 8.8g of 80% by weight of divinylbenzene, 16.2g of triallyl isocyanurate; Weigh 2.04g of polyvinylpyrrolidone and polyurethane 1.2g is a mixed porogen, weigh 0.5g of benzoyl peroxide and 0.5g of azobisisobutyronitrile as initiators, and mix to obtain an oil phase;

[0042] Weigh 1g of cellulose, 360g of anhydrous calcium chloride, and dissolve it in 500g of water to obtain an aqueous phase;

[0043] Put the oil phase into the water phase, turn on the stirrer until the oil droplet size is 0.4~1.2mm, start to slowly heat up, and react at a constant temperature at 70°C, and the temperature rise rate is 0.5°C / min; continue the heat preservation reaction at this temperature 5 After hours, increase the temperature to 80℃ at the same heating rate, and then react at a constant temperature for 2 hours; then increase the temperature to 90℃ at the same heating rate, react at a constant temperature for 2 hours, and fin...

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Abstract

The invention discloses a preparation method of macroporous weak-acidity cation exchange resin. The preparation method is as follows: partially substituting methyl acrylate and acrylonitrile by adopting acrylic acid; suspending and polymerizing in calcium chloride aqueous liquor by taking toluene and gasoline as pore-foaming agents; washing and washing off the pre-foaming agents by methanol after polymerization is completed; obtaining the macroporous weak-acidity cation exchange resin by hydrolysis through NaOH aqueous liquor. The macroporous weak-acidity cation exchange resin prepared by adopting the process not only has weak acid exchange capacity higher than 11 mmol / g, but also has pure white color in comparison with the traditional resin. The preparation method disclosed by the invention has the advantages of not removing alcohol group by hydrolysis, being lower in price of acrylic acid, simple in process, capable of recycling water-phase calcium chloride aqueous liquor, low in cost and small in environmental pollution, and the like.

Description

Technical field [0001] The invention relates to a preparation method of macroporous weakly acidic cation exchange resin. Used in the 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 mainly two production processes used by resin companies. One is to use polymethyl acrylate that is polymerized once or twice as white balls, which are obtained by hydrolysis Macroporous weak acid resin; another process is to use acrylonitrile as monomer to prepare macroporous white balls, and then hydrolyze to obtain macroporous weak acid resin. [0003] Macroporous weakly acidic cation exchange resin is mainly used in the water treatment industry. At present, there are two main production processes. One is to obtain macroporous weakly acidic cation exchange resin by hydrolysis of polymerized white balls prepared with polymethyl acrylate as the main material; The other...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/06C08F220/14C08F212/08C08F212/36C08F226/06C08F8/12C08J9/26B01J39/20
Inventor 崔峰陶成胡德凯周小玉
Owner ANHUI SANXIN RESIN TECH