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Neopentyl glycol ester preparation method

A technology of neopentyl glycol ester and neopentyl glycol, 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, small corrosion, Good product quality

Inactive Publication Date: 2018-09-25
XIAN GERUIDE NEW CHEM MATERIALS CO LTD
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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, 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 diglycol The crude alcohol ester was cooled to 80°C, neutralized, washed with water, rectified, collected fractions, decolorized with 0.20 g of diatomaceous earth and 0.39 kg 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 the temperature for 8 hours, then use the residual heat to remove benzoic acid, isooctanoic acid and xylene (vacuum degree ≥ 0.08MPa) under reduced pressure to obtain the crude product of neopentyl glycol ester. 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 product of neopentyl glycol ester with an esterification rate of 99.66% , the ester content was 99.2%, and the yield was 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 warm for 7 hours, 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 was 99.4%, and the yield was 99.1%.

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PUM

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Abstract

The invention discloses a neopentyl glycol ester preparation method, which comprises: 1, adding neopentyl glycol, benzoic acid, isooctanoic acid and a water-carrying agent into a reaction kettle, stirring, and heating; 2, adding a non-acid catalyst, continuously heating, carrying out thermal insulation, and carrying out an esterification reaction; 3, removing the benzoic acid, the isooctanoic acidand the water-carrying agent to obtain a neopentyl glycol ester crude product; and 4, cooling the neopentyl glycol ester crude product, neutralizing, carrying out water washing, rectifying, decolorizing, and carrying out pressure filtration to obtain the finished product. According to the present invention, the product neopentyl glycol ester is prepared by using neopentyl glycol, benzoic acid andisooctanoic acid as the raw materials, using the non-acid catalyst and using the solvent as the water-carrying agent through the esterification reaction, such that the method has advantages of simpleprocess steps, safe and stable operation, low corrosion on 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 method for preparing 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 mee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C67/08C07C69/78C08K5/103
CPCC07C67/08C08K5/103C07C69/78
Inventor 孙蓓林泽欣
Owner XIAN GERUIDE NEW CHEM MATERIALS CO LTD
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