Method for Synthesizing Polyol Fatty Acid Ester Using Falling Film Evaporator

A falling film evaporator and fatty acid ester technology, which is applied in the field of synthesis of ester compounds in organic chemistry, can solve the problems of slow rightward shift of reaction balance, low heat transfer efficiency, limited contact area between liquid and heating surface, etc. The effect of fast and high esterification efficiency

Active Publication Date: 2018-08-10
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the traditional reactor, the contact area between the liquid and the heating surface is limited, the heat transfer efficiency is low, and the water generated in the reaction system has to overcome the barriers of layers of molecules to escape the liquid surface, and the reaction balance shifts to the right slowly.
[0006] To sum up, various types of catalysts are used in the prior art, thus facing the problems of cost and waste discharge, the tank reactor usually used in the prior art has poor heat transfer effect, and the water generated during the reaction process is not easy to escape from the system

Method used

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  • Method for Synthesizing Polyol Fatty Acid Ester Using Falling Film Evaporator
  • Method for Synthesizing Polyol Fatty Acid Ester Using Falling Film Evaporator

Examples

Experimental program
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Effect test

Embodiment a

[0055] Present embodiment provides a kind of method that adopts falling film evaporator to synthesize polyol fatty acid ester, comprises the steps:

[0056] 1) Mix polyhydric alcohol and fatty acid according to the molar ratio of hydroxyl and carboxyl groups of 1:1, heat and stir to make them miscible, and obtain a reaction mixture; the polyhydric alcohol is trimethylolpropane; the fatty acid is simultaneously satisfied Saturated or double bond-containing, linear or branched, monobasic acids with 6-18 carbon atoms or mixed acids prepared from two or more monobasic acids (the preparation ratio is not limited);

[0057] 2) Set the temperature of the falling film evaporator to 180°C, the pressure to 5KPa, and the temperature of the external condenser to -20°C;

[0058] 3) Make the reaction mixture obtained in step 1) flow into the falling film evaporator, carry out the esterification reaction in the form of a continuous flowing liquid film, synthesize polyol fatty acid ester, and...

Embodiment b

[0060] Present embodiment provides a kind of method that adopts falling film evaporator to synthesize polyol fatty acid ester, comprises the steps:

[0061] 1) Mix polyhydric alcohol and fatty acid according to the molar ratio of hydroxyl and carboxyl groups of 1.6, heat and stir to make them miscible, and obtain a reaction mixture; the polyhydric alcohol is pentaerythritol; the fatty acid is saturated or contains double bonds at the same time , linear or branched monobasic acid with three conditions of 6-18 carbon atoms or a mixed acid prepared from two or more monobasic acids (the preparation ratio is not limited);

[0062] 2) Set the temperature of the falling film evaporator to 250°C, the pressure to 60KPa, and the temperature of the external condenser to 30°C;

[0063] 3) Make the reaction mixture obtained in step 1) flow into the falling film evaporator, carry out the esterification reaction in the form of a continuous flowing liquid film, synthesize polyol fatty acid es...

Embodiment c

[0065] Present embodiment provides a kind of method that adopts falling film evaporator to synthesize polyol fatty acid ester, comprises the steps:

[0066] 1) Mix polyhydric alcohol and fatty acid according to the molar ratio of hydroxyl and carboxyl groups of 1:1.1, heat and stir to make them miscible, and obtain a reaction mixture; the polyhydric alcohol is trimethylolpropane; the fatty acid is simultaneously satisfied Saturated or double bond-containing, linear or branched, monobasic acids with 6-18 carbon atoms or mixed acids prepared from two or more monobasic acids (the preparation ratio is not limited);

[0067] 2) Set the temperature of the falling film evaporator to 200°C, the pressure to 20KPa, and the temperature of the external condenser to 0°C;

[0068] 3) Make the reaction mixture obtained in step 1) flow into the falling film evaporator, carry out the esterification reaction in the form of a continuous flowing liquid film, synthesize polyol fatty acid ester, an...

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Abstract

The invention discloses a method for synthesizing polyol fatty acid ester by adopting a falling-film evaporator. The method comprises the following steps: mixing polyol and fatty acid in accordance with that the mole ratio of hydroxyl to carboxyl is 1: (1 to 1.6), carrying out heating and stirring so as to mutually dissolve the polyol and the fatty acid and obtain a reaction mixture solution; setting the temperature of the falling-film evaporator to 180 DEG C to 250 DEG C, setting the pressure to 5KPa to 60KPa, and setting the external condenser temperature to -20 DEG C to 30 DEG C; and enabling the reaction mixture solution to flow into the falling-film evaporator so as to form a continuous flowing liquid film, carrying out heating, and then, carrying out an esterification reaction so as to synthesize the polyol fatty acid ester. According to the method disclosed by the invention, the technical effects of high efficiency, environment-friendliness and environmental protection can be achieved.

Description

technical field [0001] The invention relates to a method for synthesizing ester compounds in organic chemistry, in particular to a method for synthesizing polyol fatty acid esters. Background technique [0002] Fatty acid polyol esters have excellent thermal stability, oxidation resistance, good low-temperature viscosity and high viscosity index, and are widely used in the lubrication of various machinery, especially as aviation lubricants, hydraulic fluids, compressor oils, etc. , by adjusting the carbon chain length and structure of fatty acids, products that can be used under different working conditions can be obtained. Because of its natural biodegradability, fatty acid polyol ester is also a green lubricant. In addition, fatty acid polyol ester can also be used as a plasticizer with excellent insulation and temperature resistance, and is widely used in the production of high temperature resistant lubricants. Cable materials and the production of artificial leather, pl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C67/08C07C69/30C07C69/33C07C69/58C07C69/587
Inventor 孔令杰张东恒李洪伟
Owner PETROCHINA CO LTD
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