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Recycling method of GMA rectification residual liquid

A raffinate and rectification technology, applied in the field of recycling of GMA rectification raffinate, can solve the problems of environmental damage, waste of resources, etc., and achieve the effects of resource saving, simple molding and good chemical corrosion resistance.

Inactive Publication Date: 2020-05-08
ANHUI XINYUAN CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a method for recycling GMA rectification raffinate, reduce the production cost of GMA, solve the waste of resources in the existing method of disposing rectification raffinate, and the large amount of carbon dioxide produced by incineration will cause damage to the environment The problem of reusing the GMA rectification raffinate

Method used

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  • Recycling method of GMA rectification residual liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Take the industrially produced GMA distillation residue and the measured hydroxyl value is 500mgKOH / g. Weigh 494g GMA distillation residue (containing 4.4 mol of hydroxyl group), 166g (1mol) of phthalic anhydride, and 116g of maleic anhydride ( 1mol) was added to the reactor, heated to 180℃, polycondensation reaction was carried out, the acid value of the kettle liquid was monitored, and the acid value was stabilized after it dropped to 40mgKOH / g to obtain unsaturated polyester, which was measured at 150℃ The viscosity of the lamina is 280cps, and 208g (2mol) of styrene is added to dilute to obtain an unsaturated polyester resin with commercial value.

Embodiment 2

[0018] Take the industrially produced GMA distillation residue and measure the hydroxyl value of 400mgKOH / g. Weigh 618g of the GMA distillation residue (containing 4.4 mol of hydroxyl group), 166g (1mol) of phthalic anhydride, and 116g of maleic anhydride ( 1 mol) was added to the reactor and heated to 220°C for polycondensation reaction, the acid value of the kettle liquid was monitored, and the acid value was stabilized after it dropped to 25 mgKOH / g to obtain unsaturated polyester. The lamina viscosity of the unsaturated polyester measured at a temperature of 150° C. is 330 cps. The product is diluted with 228 g (2.2 mol) of styrene to obtain an unsaturated polyester resin with commercial value.

Embodiment 3

[0020] Take the industrially produced GMA distillation residue and the measured hydroxyl value is 500mgKOH / g. Weigh 236g GMA distillation residue (containing 2.1 mol of hydroxyl), 78g (1.05mol) of 1,4-butanediol, and phthalic acid 166 g (1 mol) of acid anhydride and 116 g (1 mol) of maleic anhydride were added to the reaction kettle to raise the temperature to 200° C. to perform polycondensation reaction. The acid value of the kettle liquid was monitored. The lamina viscosity of the unsaturated polyester measured at a temperature of 150° C. is 250 cps, and the product is diluted with 166 g (1.6 mol) of styrene to obtain an unsaturated polyester resin with commercial value.

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Abstract

The invention discloses a recycling method of a GMA rectification residual liquid. The method comprises the following steps: determining the hydroxyl value of the GMA rectification residual liquid, adding polyhydric alcohol into the GMA rectification residual liquid to adjust the total hydroxyl value, then adding phthalic anhydride and maleic anhydride, and mixing, wherein the molar ratio of phthalic anhydride to maleic anhydride to total hydroxyl groups is 1:1:(4.2-4.4); heating the obtained mixed solution to 180-230 DEG C, carrying out a polycondensation reaction, monitoring the acid value change, and obtaining unsaturated polyester when the acid value is less than 40 mgKOH / g; and adding styrene into the unsaturated polyester to dilute to obtain unsaturated polyester resin, wherein the molar ratio of styrene to maleic anhydride is (1.5-3):1. The GMA rectification residual liquid is recycled, so the production cost of the GMA is reduced, and the problems that resources are wasted andthe environment is damaged by a large amount of carbon dioxide generated by incineration in an existing treatment method of the rectification residual liquid are solved.

Description

Technical field [0001] The invention relates to the technical field of organic chemical engineering, in particular to a method for recycling GMA distillation residue. Background technique [0002] At present, due to side reactions in the production process of glycidyl methacrylate (GMA), the crude product content is within 90%, and the product content after rectification is more than 99%. The residual liquid in the kettle needs to be treated as a waste liquid. The waste liquid is not only of no use value, but also increases the cost of waste liquid treatment. The existing method for disposing of rectification residual liquid is the incineration method. This method not only wastes resources, but also a large amount of carbon dioxide produced by incineration has certain damage to the environment. Therefore, it is necessary to recycle the GMA distillation residue. Summary of the invention [0003] The technical problem to be solved by the present invention is to provide a method fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/01C08F212/08
CPCC08F283/01C08F212/08
Inventor 李彦超程振朔孙亮帅维姚洪
Owner ANHUI XINYUAN CHEM