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Macroporous weak-base anion-exchange resin and preparation method thereof

A weakly basic anion and exchange resin technology, applied in the chemical industry, can solve the problems of reducing the exchange capacity and adsorption selectivity of the ion exchange resin, poor heat resistance of the resin, and short service life, so as to improve the agglomeration phenomenon and prolong the service life , the effect of high adsorption selectivity

Inactive Publication Date: 2019-04-05
ANHUI SANXIN RESIN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For these harmful or refractory anions, the main removal methods are adsorption and ion exchange. The adsorption method mainly removes water pollutants through hydrophobic action, but its conventional adsorption resin has weak force on these anion pollutants and the adsorption capacity is relatively low. The ion exchange method is relatively strong for ionic compounds in water, but when harmful or refractory anions exist together with other ions in the aqueous solution, the exchange capacity and adsorption selectivity of the ion exchange resin will be reduced, and the resin’s resistance Poor thermal performance and short service life

Method used

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  • Macroporous weak-base anion-exchange resin and preparation method thereof
  • Macroporous weak-base anion-exchange resin and preparation method thereof
  • Macroporous weak-base anion-exchange resin and preparation method thereof

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Embodiment 1

[0031] In the present embodiment, a kind of preparation method of macroporous weakly basic anion exchange resin is provided, it comprises the following steps:

[0032] Step 1: Remove the polymerization inhibitor in 2-vinylpyridine: Add 2-vinylpyridine to anhydrous calcium carbide powder, place it for 24 hours, and distill under reduced pressure at a temperature of 60-70°C and a pressure of 3.8-4KPa to obtain 2-vinylpyridine containing a polymerization inhibitor;

[0033] Step 2: remove the polymerization inhibitor in 2-vinylpyridine: wash divinylbenzene with 8% sodium hydroxide solution and dry under anhydrous calcium chloride desiccant to obtain divinylbenzene without polymerization inhibitor ;

[0034] Step 3: Weigh 60g 2-vinylpyridine monomer, 25g divinylbenzene crosslinking agent, 20g polyurethane and 40g modified hydroxymethyl cellulose as mixed porogen, 0.225g benzoyl peroxide and 0.675g of azobisisobutyronitrile is a mixed initiator, mixed to obtain an oil phase;

[...

Embodiment 2

[0039] In the present embodiment, a kind of preparation method of macroporous weakly basic anion exchange resin is provided, it comprises the following steps:

[0040] Step 1: Remove the polymerization inhibitor in 2-vinylpyridine: Add 2-vinylpyridine to anhydrous calcium carbide powder, place it for 24 hours, and distill under reduced pressure at a temperature of 60-70°C and a pressure of 3.8-4KPa to obtain 2-vinylpyridine containing a polymerization inhibitor;

[0041] Step 2: remove the polymerization inhibitor in 2-vinylpyridine: wash divinylbenzene with 8% sodium hydroxide solution and dry under anhydrous calcium chloride desiccant to obtain divinylbenzene without polymerization inhibitor ;

[0042] Step 3: Weigh 70g of 2-vinylpyridine monomer, 30g of divinylbenzene crosslinking agent, 43.75g of polyurethane and 43.75g of modified hydroxymethyl cellulose as the mixed porogen, 0.7g of benzyl peroxide Acyl and 0.7g azobisisobutyronitrile are mixed initiators, mixed to obt...

Embodiment 3

[0047] In the present embodiment, a kind of preparation method of macroporous weakly basic anion exchange resin is provided, it comprises the following steps:

[0048] Step 1: Remove the polymerization inhibitor in 2-vinylpyridine: Add 2-vinylpyridine to anhydrous calcium carbide powder, place it for 24 hours, and distill under reduced pressure at a temperature of 60-70°C and a pressure of 3.8-4KPa to obtain 2-vinylpyridine containing a polymerization inhibitor;

[0049]Step 2: remove the polymerization inhibitor in 2-vinylpyridine: wash divinylbenzene with 8% sodium hydroxide solution and dry under anhydrous calcium chloride desiccant to obtain divinylbenzene without polymerization inhibitor ;

[0050] Step 3: Weigh 80g 2-vinylpyridine monomer, 35g divinylbenzene crosslinking agent, 40g polyurethane and 80g modified hydroxymethyl cellulose as mixed porogen, 1.8g benzoyl peroxide and 0.6g of azobisisobutyronitrile is a mixed initiator, mixed to obtain an oil phase;

[0051]...

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Abstract

The invention discloses macroporous weak-base anion-exchange resin and a preparation method thereof. The macroporous weak-base anion-exchange resin comprises the following components: an oil phase anda water phase, wherein the oil phase is 60-80 parts of a 2-vinylpyridine monomer, 25-35 parts of a divinylbenzene cross-linking agent, 100-150% of polyurethane and modified hydroxymethyl cellulose asa mixed pore-foaming agent by monomer weight, and 1.5-3% of benzoyl peroxide and azodiisobutyronitrile as a mixed initiator by monomer weight; and the water phase is 480-600 parts of deionized water,2-3 parts of a hydroxypropyl methyl cellulose dispersing agent, and 38-42 parts of a sodium nitrite salting-out agent. The preparation method thereof comprises the following steps: adding the oil phase to the water phase, stirring, varying a temperature, and performing a curing reaction. The prepared macroporous weak-base anion-exchange resin has higher adsorptive selectivity, larger adsorptioncapacity and good heat resistance, and is capable of efficiently removing harmful or degradation-resistant anions of an arsenate ion, an aromatic sulfonate ion, a fumaric acid radical ion and the like, and prolonging service life thereof.

Description

technical field [0001] The invention relates to a preparation method of a macroporous weakly basic anion exchange resin, which belongs to the field of chemical industry. Background technique [0002] With the continuous development of metallurgy and chemical industries, a large number of harmful or refractory pollutants are produced. These pollutants are the focus of environmental governance. Among them, arsenate ions, aromatic sulfonate ions, fumarate ions, etc. The removal of degradation anions is the top priority of environmental governance. For these harmful or refractory anions, the main removal methods are adsorption and ion exchange. The adsorption method mainly removes water pollutants through hydrophobic action, but its conventional adsorption resin has weak force on these anion pollutants and the adsorption capacity is relatively low. The ion exchange method is relatively strong for ionic compounds in water, but when harmful or refractory anions exist together wit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F226/06C08F212/36C08F2/44C08F4/04C08F4/34C08J9/26B01J41/14
CPCB01J41/14C08F2/44C08F4/04C08F4/34C08F226/06C08J9/26C08J2339/08C08F212/36
Inventor 陶成张守安胡德凯
Owner ANHUI SANXIN RESIN TECH
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