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Pentaerythritol monooleate preparation method

A quaternary tetraol and monooleate technology, applied in the field of chemical synthesis, can solve the problems of residual catalyst acid, unusable electronic industry, complicated post-processing, etc., to improve the reaction yield and appearance, and improve product quality and appearance. Effect

Inactive Publication Date: 2017-02-15
SINOPHARM CHEM REAGENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The disadvantages of the above-mentioned traditional preparation process are: a. complex after-treatment, high environmental protection pressure, and high cost; b. strong acidic substances such as sulfuric acid and p-toluenesulfonic acid exist in the catalyst, which are highly corrosive; Stirring, the efficiency is not high, resulting in a large difference in the degree of esterification, there are single, di and unesterified components; d. The product has residual catalyst acid, and the product is easy to change color when used at high temperature, so it cannot be used in the electronics industry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1: This embodiment specifically relates to a kind of preparation method of pentaerythritol monooleate, and this preparation method comprises the following steps:

[0017] (1) Add 1 mol of oleic acid and 1 mol of pentaerythritol into the reaction vessel, and then add the zinc oxide composite catalyst for anti-oxidation into the reaction vessel and perform ultrasonic mixing. Among them, the zinc oxide composite catalyst Composed of zinc oxide and zinc powder, the mass of zinc oxide is 0.5% of the mass of oleic acid, and the mass of zinc powder is 0.1% of the mass of oleic acid;

[0018] (2) Turn on the pump to evacuate the reaction vessel to a negative pressure of 50 mmHg, heat it to 70°C under ultrasonic waves, and carry out the esterification reaction;

[0019] (3) Central control, when the acid value reaches 0.05, stop the reaction;

[0020] (4) Filtrate while hot to obtain a light yellow pentaerythritol monooleate liquid product with a yield of 96% and a p...

Embodiment 2

[0021] Embodiment 2: This embodiment specifically relates to a kind of preparation method of pentaerythritol monooleate, and this preparation method comprises the following steps:

[0022] (1) Add 1 mol of oleic acid and 1 mol of pentaerythritol into the reaction vessel, and then add the zinc oxide composite catalyst for anti-oxidation into the reaction vessel and perform ultrasonic mixing. Among them, the zinc oxide composite catalyst Composed of zinc oxide and zinc powder, the mass of zinc oxide is 0.7% of the mass of oleic acid, and the mass of zinc powder is 0.2% of the mass of oleic acid;

[0023] (2) Turn on the pump to evacuate the reaction vessel to a negative pressure of 70 mmHg, heat it to 80°C under ultrasonic waves, and carry out the esterification reaction;

[0024] (3) Central control, when the acid value reaches 0.05, stop the reaction;

[0025] (4) Filtrate in time while hot to obtain a light yellow pentaerythritol monooleate liquid product with a yield of 95....

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Abstract

The invention discloses a pentaerythritol monooleate preparation method, which comprises: placing oleic acid and pentaerythritol in a reaction container according to a molar ratio of 1:1, adding a zinc oxide composite catalyst, and carrying out ultrasonic uniform mixing; opening a pump and vacuumizing, carrying out ultrasonic heating to a temperature of 70-90 DEG C, and carrying out an esterification reaction; carrying out middle control, and stopping the reaction after the acid value is less than or equal to 0.05; and filtering to obtain the pentaerythritol monooleate. According to the present invention, the pentaerythritol monooleate preparation method has advantages of low reaction temperature, good product color, high yield, high product purity, and low cost.

Description

technical field [0001] The invention belongs to the technical field of chemical synthesis, and in particular relates to a preparation method of pentaerythritol monooleate. Background technique [0002] Pentaerythritol monooleate is the main component of biodegradable green lubricating oil, and it is also an anti-oxidation nonionic surfactant, which is widely used in green lubricating oil industry, electronic circuit board and other industries. [0003] The traditional preparation technology of pentaerythritol monooleate mainly contains following several kinds: [0004] 1) Under the reaction temperature of 140°C and the action of a catalyst, oleic acid and pentaerythritol are directly synthesized to pentaerythritol monooleate; [0005] 2) Under the action of a catalyst, use xylene as a water-carrying agent to synthesize pentaerythritol monooleate from oleic acid and pentaerythritol under high-temperature reflux; [0006] The disadvantages of the above-mentioned traditional ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C67/08C07C69/58
CPCC07C67/08C07C69/58
Inventor 顾小焱郭建国曹丽丽顾金凤
Owner SINOPHARM CHEM REAGENT
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