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Synthesis method of neopentyl glycol ester

A technology of neopentyl glycol ester and synthesis method, which is applied in the field of synthesis of polyol mixed esters, can solve the problems of hygienic performance, non-toxicity and difficulty in meeting environmental protection requirements, and achieve low production cost, simple process steps, and low corrosion resistance. small effect

Inactive Publication Date: 2014-04-23
河南庆安化工高科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the main plasticizers produced by domestic enterprises are difficult to meet the requirements of environmental protection in terms of many properties, especially hygiene and non-toxicity.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] In a 2000ml reactor, first add 156g of neopentyl glycol, 194.4g of isooctanoic acid, 164.7g of benzoic acid, and 36g of toluene, then start stirring, and start to heat up after stirring fully. When the temperature rises to 180°C, add 1.03g of titanium Tetraisopropyl acid, continue to heat up to 230 ° C, keep warm for 7 hours, and then use waste heat to remove benzoic acid, isooctanoic acid and toluene under reduced pressure (vacuum degree ≥ 0.08MPa) to obtain crude neopentyl glycol ester. The crude alcohol ester was cooled to 80°C, neutralized, washed with water, rectified, collected fractions, decolorized with 0.20g of diatomaceous earth and 0.39kg of activated carbon, and finally press-filtered to obtain the finished neopentyl glycol ester with an esterification rate of 99.75%. The ester content is 99.5%, and the yield is 99%.

Embodiment 2

[0017] In a 2000ml reactor, first add 156g of neopentyl glycol, 172.8g of isooctanoic acid, 146.4g of benzoic acid, and 38g of xylene, then start stirring, and start to heat up after fully stirring. When the temperature rises to 170°C, add 1.15 g tetrabutyl titanate, continue to heat up to 240°C, keep it warm for 8 hours, and then remove benzoic acid, isooctanoic acid and xylene under reduced pressure using waste heat (vacuum degree ≥ 0.08MPa) to obtain crude neopentyl glycol ester, and the new The crude pentylene glycol ester was cooled to 75°C, neutralized, washed with water, rectified, collected fractions, decolorized with 0.19g of diatomaceous earth and 0.38g of activated carbon, and press-filtered to obtain the finished neopentyl glycol ester with an esterification rate of 99.66% , the ester content is 99.2%, and the yield is 98.9%.

Embodiment 3

[0019] In a 2000ml reaction kettle, first add 156g of neopentyl glycol, 195.7g of isooctanoic acid, 182.3g of benzoic acid, and 6g of toluene, then start stirring, and start to heat up after fully stirring. When the temperature rises to 180°C, add 0.29g Tetraisopropyl titanate, continue to heat up to 230°C, keep it warm for 7 hours, and then use waste heat to remove benzoic acid, isooctanoic acid and toluene under reduced pressure (vacuum degree ≥ 0.08MPa) to obtain crude neopentyl glycol ester, and neopentyl glycol The crude glycol ester was cooled to 80°C, neutralized, washed with water, rectified, collected fractions, decolorized with 0.20g of diatomaceous earth and 0.39kg of activated carbon, and finally press-filtered to obtain the finished neopentyl glycol ester with an esterification rate of 99.65%. , the ester content is 99.4%, and the yield is 99.1%.

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Abstract

The invention belongs to a synthesis method of neopentyl glycol ester, which comprises the following steps: (I) adding neopentyl glycol, benzoic acid, isocaprylic acid and a water carrying agent into a reaction kettle, and stirring and heating; (II) when the temperature in the kettle is increased to 170-180 DEG C, adding a non-acid catalyst, further heating to 200-300 DEG C, and preserving heat for an esterification reaction; (III) removing the benzoic acid, isocaprylic acid and water carrying agent to obtain a crude product of neopentyl glycol ester; and (IV) cooling the crude product of neopentyl glycol ester to 75-85 DEG C, and neutralizing, washing, rectifying, decolorizing and filter pressing to obtain the finished product. The method provided by the invention has the advantages of simple process steps, safe and stable operation, little corrosion of reaction equipment, high yield, good product quality and low production cost.

Description

technical field [0001] The invention relates to the synthesis of polyol mixed esters, in particular to a synthesis method of neopentyl glycol esters. Background technique [0002] Plasticizers are the most widely used additives in the plastics industry, and they play a decisive role in promoting the development of the plastics industry, especially the polyvinyl chloride industry. At present, various new plastics have penetrated into various fields such as industry and agriculture, transportation, transportation, medicine, food, clothing, construction, and national defense. With the improvement of environmental protection awareness in various countries around the world, plastic products such as medical packages, medical devices, food packaging, daily necessities, and toy processing have put forward higher functional, safety and environmental protection requirements for the main plasticizer. Research on the application of pharmaceutical products and plastic products that meet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C69/78C07C67/08C08K5/103
CPCC07C67/08C08K5/103
Inventor 宋广勋杨振夏涛郜丽红于淑萍李俊华
Owner 河南庆安化工高科技股份有限公司
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