Preparation process of neopentyl polyacohol octocapric acid ester

A technology of neopentyl polyol and alcohol octadecanoate, applied in the preparation of carboxylate, the preparation of organic compounds, organic chemistry and other directions, can solve the problems of high production cost, lower acid value and darker color, etc. The effect of lower production costs, lower operating pressures and temperatures, and lower overall costs

Inactive Publication Date: 2011-04-27
ZHEJIANG HUANGMA TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the contradiction between reducing the acid value and darkening the color and luster in the prior art, and the shortcoming that the production cost is too high, to provide a kind of synthetic method for preparing near colorless, low acid value neopentyl polyol octadecanoic acid ester method

Method used

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Examples

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preparation example Construction

[0012] The preparation technology of neopentyl polyalcohol octadecanoic acid ester of the present invention, utilizes molecular distillation technology to refine the method for neopentyl polyalcohol octadecanoic acid ester to comprise the steps: (1) take neopentyl polyalcohol and octadecanoic acid as The raw materials are fed according to a certain ratio, and the crude product is obtained by esterification reaction under the condition of p-toluenesulfonic acid as a catalyst; (2) the crude product is subjected to molecular distillation to obtain a nearly colorless, low acid value, high-quality Neopentyl polyol capryl decanoate.

[0013] In the esterification reaction in the step (1), the raw material neopentyl polyol can be pentaerythritol, trimethylolpropane and neopentyl glycol; the alkyd molar ratio can be pentaerythritol and caprylic acid ester 1: 4.1~4.4, Trimethylol propane and octadecanoic acid ester 1: 3.1~3.3, neopentyl glycol and octadecanoic acid ester 1: 2.1~2.2; th...

Embodiment 1

[0017] Add 136g of pentaerythritol, 687.3g of octadecanoic acid, and 8.2g of p-toluenesulfonic acid (alkyd molar ratio: 1:4.35) in sequence in a 1000mL esterification reaction kettle equipped with a water separator, blow nitrogen gas, and start stirring Slowly raise the temperature to 180-185°C, and react at this temperature, distill off the water generated by the reaction, after 4.0 hours of reaction, no water has been distilled out, and after cooling down to 60°C, the crude product of pentaerythritol caprylic decanoate is obtained; then the crude product is packed into the constant temperature storage tank, and then into the first-level wiped-film molecular still to separate and remove water, low molecular weight components and free p-toluenesulfonic acid. The evaporation temperature is 130°C and the vacuum is 500Pa; About 55g of unreacted octadecanoic acid was separated by a molecular still, the evaporation temperature was 160°C, and the vacuum degree was 10Pa. The obtained ...

Embodiment 2

[0019] Add 136g of pentaerythritol, 647.8g of octadecanoic acid, and 6.3g of p-toluenesulfonic acid (the molar ratio of alkyd to acid: 1:4.1) in sequence in a 1000mL esterification reaction kettle equipped with a water separator. Slowly raise the temperature to 175-180°C, and react at this temperature, distill off the water generated by the reaction, and after 5.0 hours of reaction, no water has been distilled out, and after cooling down to 60°C, the crude product of pentaerythritol caprylic decanoate is obtained; then the crude product is packed into the constant temperature storage tank, and then into the first-stage wiped-film molecular still to separate and remove water, low molecular weight components and free p-toluenesulfonic acid. The evaporation temperature is 120°C and the vacuum degree is 100Pa; About 15g of unreacted octadecanoic acid was separated by the molecular still, the evaporation temperature was 150°C, and the vacuum degree was 1Pa. The obtained nearly color...

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Abstract

The invention discloses a preparation process of neopentyl polyacohol octocapric acid ester. The preparation process comprises the following steps: carrying out esterification on neopentyl polyacohol and octocapric acid as raw materials and p-toluenesulphonic acid as catalyst at the temperature of 130-190 DEG C for 3-5 hours, draining the produced water by bubbling so as to obtain crude neopentyl polyacohol octocapric acid ester; and carrying out molecular distillation on the crude neopentyl polyacohol octocapric acid ester, so as to obtain the neopentyl polyacohol octocapric acid ester finished product. The molecular distillation comprises two stages: removing moisture, low molecular weight component and free p-toluenesulfonic acid under the conditions that processing temperature of a primary stage is 100-130 DEG C and vacuum degree is 100-2000Pa; and removing octocapric acid under the conditions that processing temperature of a secondary stage is 130-160 DEG C and vacuum degree is 1-100Pa. The preparation process has low production cost and is environment-friendly, and the obtained product has the advantages of light lustre, low acid value and high quality.

Description

technical field [0001] The invention relates to a preparation process of neopentyl polyol capryl decanoate, which belongs to the technical field of organic chemistry. Background technique [0002] Neopentyl polyol capryl decanoate includes pentaerythritol capryl decanoate, trimethylolpropane capryl decanoate and neopentyl glycol capryl decanoate. Compared with other octadecanoic acid esters, due to the special structure of quaternary carbon atoms in neopentyl polyol esters—there is no hydrogen atom at the β position in the molecule, it can form a six-atom resonance structure ring with hydroxyl oxygen. Its ester structure can be destroyed only under the condition of environment, so it has excellent anti-oxidation and anti-elimination reaction stability. The above structural features also make neopentyl polyol caprylic decanoate have good viscosity-temperature characteristics, excellent low-temperature and high-temperature performance, and outstanding oxidation stability. At...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C67/08C07C67/54C07C69/33C07C69/30C07C69/28
Inventor 王伟松金一丰张伟钢王胜利耿丽
Owner ZHEJIANG HUANGMA TECH
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