Preparation method of strong-acidity polystyrene cationic exchange resin

A cation exchange, polystyrene technology, used in cation exchange materials, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problem of uneven copolymer cross-linked network structure, small resin exchange capacity, and proportion difference It can achieve the effect of simple and controllable synthesis process, improved stability and low ignition loss rate.

Inactive Publication Date: 2018-02-02
ANHUI WANDONG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the purity of industrialized divinylbenzene and the ratio of each isomer also vary greatly due to different manufacturers, which leads to the problem that the obtained microspheres have a dense structure or insufficient crosslinking, resulting in a crosslinked network structure of the copolymer Inhomogeneity
The crosslinking density and uniformity of the resin will have a great impact on the performance of the ion exchange resin, such as the exchange capacity of the resin is small, the strength is poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A preparation method for strongly acidic polystyrene cation exchange resin, comprising the steps of:

[0019] S1. Mix methylstyrene, methylene bisacrylamide, and toluene evenly, add pretreated rice husk, and gelatin aqueous solution, mix evenly, add tert-butyl peroxide-2-ethylhexanoate, heat up and stir, heat up, and keep warm , aged, and filtered to obtain polystyrene microspheres;

[0020] S2. Swell the polystyrene microspheres into n-heptane, add sulfuric acid solution dropwise under stirring, adjust the temperature after the dropwise addition is complete, stir, wash with ice water, and filter to obtain a strongly acidic polystyrene cation exchange resin.

Embodiment 2

[0022] A preparation method for strongly acidic polystyrene cation exchange resin, comprising the steps of:

[0023] S1. Mix 20 parts of methylstyrene, 8 parts of methylenebisacrylamide and 15 parts of toluene in parts by weight, add 10 parts of pretreated rice husks, and 100 parts of gelatin aqueous solution with a concentration of 0.04wt%, mix evenly, add 2 parts of tert-butyl peroxy-2-ethylhexanoate, heated to 55°C and stirred for 35 minutes, heated to 80°C and kept for 50 minutes, aged, and filtered to obtain polystyrene microspheres;

[0024] S2. Send 30 parts of polystyrene microspheres into 140 parts of n-heptane by weight to swell for 20 minutes, add 4 parts of sulfuric acid solution with a concentration of 96 wt% dropwise under stirring, adjust the temperature to 4°C after the addition is complete, and stir for 2 hours , washed with ice water, and filtered to obtain a strongly acidic polystyrene cation exchange resin.

Embodiment 3

[0026] A preparation method for strongly acidic polystyrene cation exchange resin, comprising the steps of:

[0027] S1. Mix 40 parts of methylstyrene, 2 parts of methylenebisacrylamide, and 35 parts of toluene in parts by weight, add 4 parts of pretreated rice husks, and 100 parts of gelatin aqueous solution with a concentration of 0.06wt%, mix evenly, add 1 part of tert-butyl peroxy-2-ethylhexanoate, heated to 65°C and stirred for 15 minutes, heated to 86°C and kept for 30 minutes, aged, and filtered to obtain polystyrene microspheres;

[0028] The pretreated rice husk is prepared by the following process: stir the rice husk and kaolin, send it into an oxygen-free muffle furnace to heat up and calcinate, cool, grind, add nitric acid solution to stir, wash until neutral, dry, add hyperbranched polysiloxane , acetone, ultrasonic treatment, microwave treatment, and spray drying to obtain pretreated rice husk;

[0029] S2. Send 50 parts of polystyrene microspheres into 100 part...

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PUM

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Abstract

The invention discloses a preparation method of strong-acidity polystyrene cationic exchange resin, comprising the steps of mixing well methyl styrene, methylene bisacrylamide, and methylbenzene, adding pre-processed rice hull and gelatin solution, mixing well, adding tert-butyl peroxy-2-ethylhexanoate, heating and stirring, heating, holding the temperature, aging, and filtering to obtain polystyrene microspheres; feeding the polystyrene microspheres into n-heptane for swelling, dropwise adding sulfuric acid solution while stirring, adjusting the temperature after dropwise adding, stirring, washing with ice water, and filtering to obtain the strong-acidity polystyrene cationic exchange resin. The pre-processed rice hull is prepared by: stirring rice hull and kaolin, feeding into an anaerobic muffle furnace, heating for calcining, cooling, grinding, adding nitric acid solution, stirring, washing until neutrality, drying, adding hyperbranched polysiloxane and acetone, ultrasonically treating, treating with microwave, and drying by spraying.

Description

technical field [0001] The invention relates to the technical field of cation exchange resins, in particular to a method for preparing strongly acidic polystyrene-based cation exchange resins. Background technique [0002] At present, the traditional production process of strongly acidic polystyrene cation exchange resin is mostly obtained by free radical suspension copolymerization of styrene monomer and divinylbenzene, and then sulfonation. Divinylbenzene is used as a crosslinking agent to make the polymer chain become an interlinked network structure. However, the purity of industrialized divinylbenzene and the ratio of each isomer also vary greatly due to different manufacturers, which leads to the problem that the obtained microspheres have a dense structure or insufficient crosslinking, resulting in a crosslinked network structure of the copolymer unevenness. The crosslinking density and uniformity of the resin will have a great impact on the performance of the ion e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F292/00C08F212/12C08F8/36B01J39/20B01J20/26B01J20/30C02F1/28
CPCB01J20/261B01J39/20C02F1/285C08F8/36C08F292/00C08F212/12
Inventor 魏士明梅德华樊致娟
Owner ANHUI WANDONG CHEM
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