Isostearic acid preparation method

A technology of isostearic acid and monomeric acid, applied in the field of preparing isostearic acid, can solve the problems such as the purity not reaching the quality of natural isostearic acid, the length of the isostearic acid side chain, etc., and is conducive to safe operation. , High yield of finished products, the effect of improving the process steps

Inactive Publication Date: 2014-06-25
QINGDAO SHUAIWANG OIL CHEM
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, fatty alcohol is mostly used to synthesize isostearic acid products, but the side chain of isostearic acid produced by this synthesis method is long, which is very different from natural fatty acids, and its purity cannot reach the purity of natural isostearic acid. quality

Method used

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Embodiment 1

[0013] A method for preparing isostearic acid, comprising the following steps:

[0014] (1) producing dimer acid from vegetable oleic acid to obtain by-product monomeric acid;

[0015] (2) Use p-toluenesulfonic acid and zinc oxide as catalysts, control the temperature at 95 degrees Celsius, and carry out atmospheric pressure esterification of monomeric acids and lower alcohols to generate monomeric acid esters;

[0016] (3) Catalyzed hydrogenation of monomeric acid esters to obtain fatty acid esters with low iodine value;

[0017] (4) Fatty acid esters with low iodine value are successively subjected to saponification and acidification to obtain low iodine value fatty acid mild products;

[0018] (5) After dissolving the fatty acid mixture with low iodine value in solvent oil, cool down to crystallize, filter and evaporate the filtrate under reduced pressure to collect the isostearic acid fraction to obtain the finished product.

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Abstract

The invention discloses an isostearic acid preparation method. The method comprises the following steps: 1, using vegetable oil acid to produce dimeric acid and obtain a byproduct monomer acid; 2, carrying out normal pressure esterification on the monomer acid and lower alcohol at 95DEG C with paratoluenesulfonic acid and zinc oxide as a catalyst to generate monomer acid ester; 3, carrying out catalytic hydrogenation on the monomer acid ester to obtain fatty acid ester with a low iodine number; 4, saponifying the fatty acid ester with a low iodine number, and acidifying to obtain a fatty acid mixture with a low iodine number; and 5, dissolving the fatty acid mixture with a low iodine number in solvent oil, cooling for crystallization, filtering, carrying out reduced pressure distillation of the obtained filtrate, and collecting an isostearic acid fraction to obtain a finished product. The method has the advantages of simple process, realization of less equipment investment and safe operation by selecting a proper catalyst and adopting normal pressure esterification, and realization of the high yield and the high purity of the finished product after improving the process steps.

Description

technical field [0001] The invention relates to a method for preparing isostearic acid. Background technique [0002] At present, fatty alcohol is mostly used to synthesize isostearic acid products, but the side chain of isostearic acid produced by this synthesis method is long, which is very different from natural fatty acids, and its purity cannot reach the purity of natural isostearic acid. quality. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a method for preparing isostearic acid. [0004] In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is: [0005] A method for preparing isostearic acid, comprising the following steps: [0006] (1) producing dimer acid from vegetable oleic acid to obtain by-product monomeric acid; [0007] (2) Use p-toluenesulfonic acid and zinc oxide as catalysts, control the temperature at 95 degrees Celsiu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C11C3/02C11C3/12C11C3/00
Inventor 王明夫
Owner QINGDAO SHUAIWANG OIL CHEM
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