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Method for preparing organic zinc by means of calcium analysis reactive crystallization

An organic zinc and crystallization technology, which is applied in organic chemistry, carboxylate preparation, etc., can solve the problems of coarse product particles, wastewater cannot be discharged directly, and unsatisfactory use, and achieve the effect of saving consumption

Inactive Publication Date: 2012-08-15
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The organozinc prepared by this method requires additional chemical reagents to carry out the required conversion, and produces a large amount of waste water containing inorganic salts such as sodium sulfate, sodium chloride, ammonium sulfate, etc., and the waste water cannot be discharged directly
[0006] U.S. Patent 2,492,314 utilizes amine, carbon disulfide and zinc oxide to produce organozinc containing dithiocarbamate under anhydrous conditions, but the obtained product particles are relatively coarse and large, which is not ideal for use

Method used

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  • Method for preparing organic zinc by means of calcium analysis reactive crystallization
  • Method for preparing organic zinc by means of calcium analysis reactive crystallization

Examples

Experimental program
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Effect test

Embodiment 1

[0021] In the reaction kettle, add 80 parts of terephthalic acid, add 160 parts of water, add 60 parts of sodium hydroxide, and stir. After the terephthalic acid is completely dissolved, add 60 parts of the saturated lime milk suspension, stir while adding the saturated lime milk suspension, the stirring speed is 60 rpm, and the addition is completed in 20 minutes. Let stand and settle for 60 minutes, add 60 parts of saturated sodium zincate solution, and stir while adding, the stirring rate is 30 rpm, and the addition is completed in 60 minutes. Allow to settle for 60 minutes. After centrifugal separation, the filtrate is sodium hydroxide solution, which is used to configure the next batch of sodium terephthalate solution. The product obtained by centrifugation, after washing and drying, is an organic zinc product.

Embodiment 2

[0023] In the reaction kettle, add 80 parts of terephthalic acid, add 120 parts of filtrate, add 10 parts of sodium hydroxide, and stir. After the terephthalic acid is completely dissolved, add 60 parts of the saturated lime milk suspension, stir while adding the saturated lime milk suspension, the stirring speed is 60 rpm, and the addition is completed in 20 minutes. Let stand and settle for 60 minutes, add 60 parts of saturated sodium zincate solution, and stir while adding, the stirring rate is 60 rpm, and the addition is completed in 30 minutes. Let it settle for 30 minutes. After centrifugal separation, the filtrate is sodium hydroxide solution, which is used to configure the next batch of sodium terephthalate solution. The product obtained by centrifugation, after washing and drying, is an organic zinc product.

Embodiment 3

[0025] In the reaction kettle, add 80 parts of terephthalic acid, add 120 parts of filtrate, add 80 parts of sodium hydroxide, and stir. After the terephthalic acid is completely dissolved, add 80 parts of the saturated milk of lime suspension, and stir while adding the saturated milk of lime suspension. The stirring speed is 60 rpm, and the addition is completed in 60 minutes. Let stand and settle for 60 minutes, add 80 parts of saturated sodium zincate solution, and stir while adding, the stirring rate is 60 rpm, and the addition is completed in 60 minutes. Allow to settle for 60 minutes. After centrifugal separation, the filtrate is sodium hydroxide solution, which is used to configure the next batch of sodium terephthalate solution. The product obtained by centrifugation, after washing and drying, is an organic zinc product.

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Abstract

The invention discloses a method for preparing organic zinc by means of calcium analysis reactive crystallization, which includes: adding terephthalic acid and water and / or filtrate in a reactor, and then adding sodium hydroxide to lead the terephthalic acid to dissolve into terephthalic acid sodium solution, wherein the filtrate is mother solution after centrifugal separation of organic zinc; adding saturated lime milk suspension to enable separation by crystallization of terephthalic acid calcium; adding saturated sodium zincate solution to enable separation by crystallization of terephthalic acid zinc on a terephthalic acid calcium carrier; and centrifuging, wherein filtrate which is sodium hydroxide solution is used for allocation of terephthalic acid sodium solution in next batch, so that an organic zinc product is obtained by rinsing and drying a centrifuged product. By the aid of the method, discharge of waste water containing inorganic salt such as sodium chloride and / or sodium sulfate and the like is avoided, the sodium hydroxide contained in centrifuged mother solution can be used for allocation of the terephthalic acid sodium solution in next batch, and consumption of the sodium hydroxide is reduced.

Description

【Technical field】 [0001] The invention relates to the technical field of rubber vulcanization activators, in particular to a method for preparing organic zinc by calcium precipitation reaction crystallization. 【Background technique】 [0002] The rubber vulcanization system mainly includes sulfur, accelerator, activator and stearic acid, among which the vulcanization activator is an indispensable auxiliary agent, which has an important effect on the vulcanization rate, cross-linking bond type, cross-linking density and mechanical properties of the rubber compound. A commonly used vulcanization activator is zinc oxide. However, the content of zinc and heavy metals in zinc oxide is high, and it is used in a large amount in rubber and tires. Zinc is released from rubber into the environment, for example, it is released through tire wear during use, and the release of zinc will cause environmental damage. It is very polluting and has adverse effects on human health, especially o...

Claims

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Application Information

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IPC IPC(8): C07C51/41C07C63/28
Inventor 刘够生王林林
Owner EAST CHINA UNIV OF SCI & TECH
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