Method for preparing isomeric stearic acid by means of freezing crystallization and fractionation

A technology for isomeric stearic acid and freezing crystallization, which is applied in the field of preparing isomeric stearic acid, can solve the problems of incomplete cooling crystallization, environmental protection, potential safety hazards, weak control of cooling, etc., and achieves low labor cost and the number of equipment. Less time and cost saving effect

Inactive Publication Date: 2018-07-20
杨友红
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method still adopts a heating-based preparation method, and in the process of cooling and crystallization, the control of cooling is weak, which may easily cause incomplete cooling and crystallization.
[0004] Considering that the application of aliphatic isomeric acids is becoming more and more extensive, and the splitting precision of the existing fractionation method is low, and the capital investment and energy consumption are high in the fractionation process, there are subsequent environmental protection and safety hazards, the present invention Provide an environment-friendly, low-cost, and high-precision method for preparing isomeric stearic acid by freezing crystallization

Method used

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  • Method for preparing isomeric stearic acid by means of freezing crystallization and fractionation
  • Method for preparing isomeric stearic acid by means of freezing crystallization and fractionation

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preparation example Construction

[0023] A kind of preparation method of cryogenic crystallization fractionation isomeric stearic acid, comprises the steps:

[0024] S1 raw material pretreatment: Put the aliphatic carboxylic acid after the polymerization reaction into the dehydrator for dehydration and removal of impurities;

[0025] S2 cooling and crystallization: Put the pretreated material in S1 into a low-temperature freezer, first cool down the low-temperature freezer to 0°C, and maintain this temperature for 12 hours; then cool the low-temperature freezer to -5°C, and maintain The temperature was 12 hours; finally, the low-temperature refrigerator was cooled to -10°C and maintained at this temperature for 48 hours; crystallized polymeric aliphatic carboxylic acids were obtained;

[0026] S3 low-temperature pressing: the crystallized polymeric fatty carboxylic acid is placed in the press tray of the press for pressing, and the press includes multi-layer press trays from top to bottom, and the crystallized...

Embodiment 1

[0033] A kind of preparation method of cryogenic crystallization fractionation isomeric stearic acid, comprises the steps:

[0034] S1 Pretreatment of 10 tons of raw materials: put the aliphatic carboxylic acid after the polymerization reaction into a dehydrator for dehydration and removal of impurities, and control the temperature in the dehydrator at 100°C;

[0035] S2 cooling and crystallization: Put the pretreated material in S1 into a low-temperature freezer, first cool down the low-temperature freezer to 0°C, and maintain this temperature for 12 hours; then cool the low-temperature freezer to -5°C, and maintain This temperature is 10h; finally, the temperature of the low-temperature refrigerator is lowered to -10°C, and the temperature is maintained for 50h; crystallized polymeric aliphatic carboxylic acid is obtained;

[0036] S3 Low-temperature pressing: placing the crystallized polymeric aliphatic carboxylic acid in a pressing tray of an extruding machine for pressing...

Embodiment 2

[0043] A kind of preparation method of cryogenic crystallization fractionation isomeric stearic acid, comprises the steps:

[0044] S1 Pretreatment of 10 tons of raw materials: put the aliphatic carboxylic acid after the polymerization reaction into a dehydrator for dehydration and removal of impurities, and control the temperature in the dehydrator at 105°C;

[0045]S2 cooling crystallization: put the pretreated material in S1 into a low-temperature freezer, first cool down the low-temperature freezer to 0°C, and maintain this temperature for 14 hours; then cool down the low-temperature freezer to -5°C, and maintain The temperature was 12 hours; finally, the low-temperature refrigerator was cooled to -10°C and maintained at this temperature for 48 hours; crystallized polymeric aliphatic carboxylic acids were obtained;

[0046] S3 Low-temperature pressing: placing the crystallized polymeric aliphatic carboxylic acid in a pressing tray of an extruding machine for pressing, and ...

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Abstract

The invention belongs to the technical field of preparation of isomeric stearic acid, and in particular relates to a method for preparing isomeric stearic acid by means of freezing crystallization andfractionation. According to the low temperature performance of the isomeric stearic acid, aliphatic carboxylic acid subjected to a polymer reaction is put into a low-temperature cold storage, so thatcrystals of the isomeric stearic acid can be obtained; in separation and purification processes, heating steps are fewer, so that less hot steam is produced in the purification process; compared withthe existing separation and purification steps, the method is more environmentally friendly; furthermore, the method is less in number of used equipment and simple to operate, thus being both lower in economic cost and labor cost.

Description

technical field [0001] The invention belongs to the technical field of preparation of isomeric stearic acid, and in particular relates to a method for preparing isomeric stearic acid by freezing and crystallizing fractionation. Background technique [0002] Isostearic acid is a chemical substance with the molecular formula C 18 h 36 o 2 . Used in metal processing oil, it has excellent low-temperature performance and is liquid at room temperature. Especially suitable for active metal processing such as aluminum and magnesium. The purity of the product obtained in the existing production of isomeric stearic acid is relatively low, so the reaction product needs to be separated and purified. At present, the separation and purification of isomeric acids in Sinopec is mainly based on high-tower fractionation, but for aliphatic isomeric acids, there is a lack of a purification method for isostearic acid with a high extraction rate in the field. [0003] The preparation method...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/42C07C51/43C07C53/126C07C57/12
CPCC07C51/42C07C51/43C07C53/126C07C57/12
Inventor 杨友红马永运张永罗立夫夏雪
Owner 杨友红
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