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Method capable of efficiently removing polyacrylate impurities

A polyacrylate and acrylic acid technology, which is applied in the separation/purification of carboxylate, the preparation of carboxylate, chemical instruments and methods, etc., can solve the problems of slow production efficiency, slow speed, affecting product quality, etc. efficiency, reducing impurity filtration, and shortening the effect of submersion time

Pending Publication Date: 2021-01-08
HUNAN CHUANGDA YUTU CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned filtration problems lead to the presence of impurities in the product, which affects the quality of the product
The second is that due to the weak hydrophilicity of multi-component acrylate, with the prolongation of the sinking time, the amount of a small amount of aqueous solution in the product will sink less and less, and the speed will become slower and slower. In order to sink the aqueous solution, the subsequent sinking time The longer it is, the slower the production efficiency, so a method that can efficiently remove the impurities of polyacrylic ester is proposed

Method used

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  • Method capable of efficiently removing polyacrylate impurities

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Effect test

Embodiment 1

[0022] Embodiment 1, with reference to figure 1 , a kind of method that can efficiently remove polyacrylic acid ester impurity, comprises the following steps: main material polyhydric alcohol and acrylic acid are added in the esterification reaction container, then add solid acid catalyst, add polymerization inhibitor, under certain temperature and vacuum degree condition Carry out esterification reaction under low temperature, then add water for washing operation, use the difference in specific gravity between multi-component acrylate and aqueous solution to remove most of the impurities of inorganic additives, heat up the product after washing, and use the product solvent and water to azeotrope for azeotropic dehydration , remove the water that is slightly soluble in the product solvent, reduce the penetration of impurities, then add filter aid, and further remove the impurities in the product by pressure filtration, that is, the polyol acrylic acid product is obtained.

Embodiment 2

[0023] Embodiment 2, with reference to figure 1 , a method for efficiently removing multi-component acrylate impurities, comprising the following steps:

[0024] S1: Put the main ingredients polyol and acrylic acid into an esterification reaction container, add a solid acid catalyst, add a polymerization inhibitor, stir and react, and obtain a polyol acrylic acid mixture A through esterification;

[0025] S2: Pour an appropriate amount of aqueous solution into the polyol acrylic acid mixture A, and wash with water to obtain the polyol acrylic acid mixture B;

[0026] S3: heating up the polyol acrylic acid mixture B, using the product solvent and water to azeotrope, and performing azeotropic dehydration to obtain a polyol acrylic acid mixture C;

[0027] S4: Add an appropriate amount of filter aid to the polyol acrylic acid mixture C, and further remove impurities in the product by pressure filtration to obtain a polyol acrylic acid product. The esterification reaction process...

Embodiment 3

[0028] Embodiment 3, with reference to figure 1 , a method for efficiently removing multi-component acrylate impurities, comprising the following steps:

[0029] S1: Put the main ingredients polyol and acrylic acid into an esterification reaction container, add a solid acid catalyst, add a polymerization inhibitor, stir and react, and obtain a polyol acrylic acid mixture A through esterification;

[0030] S2: Pour an appropriate amount of aqueous solution into the polyol acrylic acid mixture A, and wash with water to obtain the polyol acrylic acid mixture B;

[0031] S3: heating up the polyol acrylic acid mixture B, using the product solvent and water to azeotrope, and performing azeotropic dehydration to obtain a polyol acrylic acid mixture C;

[0032] S4: Add an appropriate amount of filter aid to the polyol acrylic acid mixture C, and further remove impurities in the product by pressure filtration to obtain a polyol acrylic acid product. The esterification reaction process...

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Abstract

The invention discloses a method capable of efficiently removing polyacrylate impurities. The method comprises the following steps: adding main materials polyol and acrylic acid into an esterificationreaction container, adding a solid acid catalyst and a polymerization inhibitor, carrying out esterification reaction at a certain temperature and vacuum degree; then, adding water to carry out waterwashing operation, removing most of inorganic auxiliary agent impurities by utilizing the specific gravity difference between polyacrylate and an aqueous solution; heating a washed product, carryingout azeotropic dehydration by utilizing azeotropy of the product solvent and water to remove water slightly dissolved in a product solvent so as to reduce penetration of impurities; and then, adding afilter aid, and further removing the impurities in the product by virtue of filter pressing, so that a polyhydric alcohol acrylic acid product is obtained. According to the invention, water slightlydissolved in the product can be removed, so that the penetration of impurities is reduced, and the effect of removing impurities by subsequent filter pressing is achieved.

Description

technical field [0001] The invention relates to the technical field of polyacrylate production, in particular to a method capable of efficiently removing impurities of polyacrylate. Background technique [0002] The existing post-treatment process has the problem that impurities penetrate the filter cake during press filtration, and cannot effectively achieve the purpose of removing impurities. And the washing process takes a long time to sink into water. The main reason is that polyacrylic acid ester has weak hydrophilicity. First, when the specific gravity difference is used to sink water, there will always be a small amount of aqueous solution that cannot sink. However, the existence of aqueous solution makes the adsorption of the filter cake in the filter press process poor, resulting in organic impurities and macromolecular polymer impurities not being adsorbed on the filter cake and passing through the filter. While the aqueous solution itself can pass through the fi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C67/08C07C67/48C07C67/58C07C67/54C07C67/62C07C69/54
CPCC07C67/08C07C67/48C07C67/58C07C67/54C07C67/62C07C69/54
Inventor 何东方
Owner HUNAN CHUANGDA YUTU CHEM CO LTD