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Esterification method of pentaerythritol

A technology of pentaerythritol ester and pentaerythritol, which is applied in the field of organic synthesis, can solve the problems of low-temperature viscosity increase, high hydroxyl value, and aggravated corrosion of metal parts, and achieve the effects of low pollution, high product yield, low acid value and hydroxyl value

Active Publication Date: 2014-10-08
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the hydroxyl value of the pentaerythritol ester should not be too large. A larger hydroxyl value will cause the lubricating oil to have stronger water absorption and increase the viscosity at low temperature. At the same time, it will aggravate the corrosion of metal parts. It is not suitable for harsh requirements on water and low cleanliness. use under high conditions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] First, put 100g of pentaerythritol, 360g of n-valeric acid and 0.46g of catalyst stannous oxide into the reaction kettle. After mixing evenly, first turn on the heating system and heat it to a temperature of 150°C and a pressure of 3000Pa to carry out the esterification reaction. , after reacting for 4 hours, then continue to heat slowly at a constant speed for 3 hours, after heating to 198°C, cool down to 70°C and filter, then add lye with a mass concentration of 10% to the reaction system to neutralize the excess acid, stand to separate and remove the alkali Liquid, finally to the product after separation, carry out vacuum dehydration under the presence of the activated carbon of above-mentioned product quality 0.5%, obtain pentaerythritol ester after filtering.

[0041] After obtaining the above-mentioned pentaerythritol ester, the performance of the pentaerythritol ester was tested, and the results showed that the conversion rate of the esterification reaction was 99...

Embodiment 2

[0043] First, put 100g of pentaerythritol, 360g of n-valeric acid and 0.23g of catalyst QS-6 into the reaction kettle. After mixing evenly, first turn on the heating system and heat it to a temperature of 155°C and a pressure of 3000Pa to carry out the esterification reaction. , after reacting for 3 hours, continue to heat at a constant speed and slowly for 2 hours, after heating to 195°C, cool down to 80°C and filter, then add lye with a mass concentration of 10% to the reaction system to neutralize the excess acid, stand to separate and remove the alkali Liquid, finally to the product after separation, carry out vacuum dehydration under the presence of the activated carbon of above-mentioned product quality 0.5%, obtain pentaerythritol ester after filtering.

[0044] After obtaining the above-mentioned pentaerythritol ester, the performance of the pentaerythritol ester was tested, and the results showed that the conversion rate of the esterification reaction was 99.9%; the hy...

Embodiment 3

[0046] First, put 1mol pentaerythritol, 4.6mol (C5~C9) mixed fatty acid and 0.24g catalyst butyltin oxide into the reaction kettle, after mixing evenly, first turn on the heating system, and heat it to a temperature condition of 160°C and a pressure of 3000Pa. Under certain conditions, carry out esterification reaction, after reacting for 4 hours, continue to heat up slowly at a constant speed for 4 hours, after heating up to 190°C, cool down to 100°C and filter, then add lye with a mass concentration of 10% to the reaction system to neutralize excess acid, stand to separate and remove the lye, and finally carry out vacuum dehydration on the separated product in the presence of 0.5% activated carbon of the above-mentioned product quality, and obtain pentaerythritol ester after filtration.

[0047] After obtaining the above-mentioned pentaerythritol ester, the performance of the pentaerythritol ester was tested, and the results showed that the conversion rate of the esterificati...

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Abstract

The invention provides an esterification method of pentaerythritol, which comprises the following step: under the action of a tin catalyst, carrying out esterification reaction on pentaerythritol and saturated fatty acid to obtain pentaerythritol ester, wherein the saturated fatty acid is one or more of butyric acid, valeric acid, hexanoic acid, heptylic acid, octanoic acid, pelargonic acid and capric acid. The esterification method provided by the invention has the advantages of higher product yield, higher product quality, simple esterification after-treatment and low pollution. The experimental result indicates that the conversion rate of the esterification reaction is greater than 99.5%, and the hydroxyl value in the reaction product is lower than 1mg KOH / g.

Description

technical field [0001] The invention belongs to the technical field of organic synthesis, in particular to a pentaerythritol esterification method. Background technique [0002] Pentaerythritol is an important chemical raw material, which is mainly used in the paint industry, and can be used to make alkyd resin paints, which can improve the hardness, gloss and durability of paint films. It is also used as a raw material for rosin resin required for paints, varnishes and printing inks, and can be used to make drying oils, smoldering paints and aviation lubricants. The fatty acid esters of pentaerythritol, referred to as pentaerythritol esters, in the industrial field, pentaerythritol esters can not only be used as plasticizers, processing stabilizers for plastic materials, release agents, dispersants, but also an important neopentyl polyol ester. Pentaerythritol ester has many ester groups and there is no hydrogen atom on the β-position carbon, so it has the characteristics...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C67/08C07C69/33
CPCC07C67/08C07C69/33
Inventor 马楷刘月皞梅莉李玉平李霞曹毅
Owner CHINA PETROLEUM & CHEM CORP
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