Method for preparing isostearic acid

A technology of isostearic acid and fatty acid, which is applied in the field of preparation of isostearic acid, can solve the problems of unsatisfactory enveloping separation effect of urea, large capital investment, low anti-oxidation performance, etc., to achieve safe operation and economic benefits Significant effect with less investment in equipment

Inactive Publication Date: 2012-01-25
GUANGRAO HUAYU CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The shortcoming of this method is: the first, because there is unsaturated fatty acid in monomeric acid again, and there is no step of hydrogenation in the technology, so the iodine value of the product obtained is high, and the antioxidant performance of product is low, and product The color of urea tends to become darker. Second, the difference in iodine value between isostearic acid and stearic acid is very small, and the effect of urea envelope separation is not ideal.
Because the research on the reaction mechanism of the esterification of higher fatty acids and the hydrogenation and hydrolysis of higher fatty acid esters is relatively in-depth, and the technology is relatively mature. Through t...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The preparation method of isostearic acid comprises the following steps:

[0023] (1) Vegetable oleic acid uses acid clay as a catalyst, polymerizes at 220°C, reacts at normal pressure for 4 hours, then adds phosphoric acid to remove the metal complex, removes clay by pressure filtration, distills the filtrate under reduced pressure, and dissolves the liquid in a vacuum of 10Pa. When the phase temperature is 240°C, collect fractions of monomeric acid;

[0024] (2) Use p-toluenesulfonic acid as a catalyst, control the temperature at 90°C, carry out esterification of monomeric acid and methanol under normal pressure, react for 10 hours, and the iodine value is 4.8 g / 100g, and the monomeric acid ester is formed; after esterification Wash with water, static and layered to remove acid impurities;

[0025] (3) Under the action of N120 type catalyst, the pressure of the monomer ester is controlled at 1.5~2.2MPa MPa, the temperature is controlled at 190°C, and after 8 hours of...

Embodiment 2

[0031] The preparation method of isostearic acid comprises the following steps:

[0032] (1) Vegetable oleic acid uses acid clay as a catalyst, polymerizes at 224°C, adds phosphoric acid to remove the metal complex after polymerization at normal pressure for 4 hours, removes clay by pressure filtration, distills the filtrate under reduced pressure, and collects it in vacuum 10Pa and When the liquidus temperature is 240°C, collect the fraction of monomeric acid;

[0033] (2) Use p-toluenesulfonic acid as a catalyst, control the temperature at 98°C, carry out esterification of monomeric acid and methanol under normal pressure, react for 3 hours, and the iodine value is 4.5 g / 100g, and the monomeric acid ester is formed; after esterification Washing, precipitation to remove acid impurities;

[0034] (3) Under the action of N120 type catalyst, the pressure of monomeric acid ester is controlled at 1.5~2.2MPa MPa, the temperature is controlled at 220°C, hydrogen gas is passed throu...

Embodiment 3

[0040] The preparation method of isostearic acid comprises the following steps:

[0041] (1) Vegetable oleic acid uses acid clay as a catalyst, polymerizes at ℃, reacts at normal pressure for 4 hours, adds phosphoric acid to remove the metal complex, removes clay by pressure filtration, and the filtrate is vacuumed at 10Pa and When the liquidus temperature is 240°C, collect the fraction of monomeric acid;

[0042] (2) Use p-toluenesulfonic acid as a catalyst, control the temperature at 90°C, carry out esterification of monomeric acid and methanol under normal pressure, react for 10 hours, and the iodine value is 4.3 g / 100g, and the monomeric acid ester is formed; after esterification Wash with water, static and layered to remove acid impurities;

[0043] (3) Under the action of N120 type catalyst, the pressure is controlled at 1.5~2.2MPa MPa, the temperature is controlled at 190°C, after 6 hours of reaction with hydrogen, the temperature is lowered to 90°C, and the catalyst i...

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Abstract

The invention relates to a method for preparing isostearic acid. The technical scheme is that the method comprises the following steps of: (1) producing dimer acid by using vegetable oil acid by a carclazyte catalysis method to obtain a byproduct, namely monomer acid; (2) controlling the temperature to be 90 to 98 DEG C and performing atmospheric esterification on the monomer acid and lower alcohol to obtain monomer acid ester by taking toluenesulfonic acid as a catalyst; (3) performing catalytic hydrogenation on the monomer acid ester to obtain aliphatic ester with a low iodine value; (4) sequentially saponifying and acidifying the aliphatic ester to obtain a mixture of stearic acid and isostearic acid; and (5) dissolving the mixture of the stearic acid and the isostearic acid by using No.6 solvent oil, reducing the temperature to -2 to 2 DEG C and performing cold separation, filtering, distilling filtrate under reduced pressure, and collecting fractions of the isostearic acid to obtain a finished product. Compared with the prior art, the method has the advantages that: the process is simple, equipment investment is low, and the safe operation is also ensured; an obtained product has high purity; and an acid value of the finished product is 180 to 188 mgKOH/g, and an iodine value is less than 8g/100g.

Description

technical field [0001] The invention relates to a method for manufacturing chemical products, in particular 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. [0003] In addition, there is another manufacturing method in the industry, that is, using vegetable oleic acid as raw material, using clay catalysis to synthesize dimer acid by-product monomer acid to separate and extract isostearic acid, and the step of clay catalysis to produce dimer acid The by-product monomeric acid obtained from acid has been widely disclosed and used, and the process is relatively mature. Therefore, there are literatures disclosing the method of directly extracting stearic acid in monomeri...

Claims

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Application Information

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IPC IPC(8): C07C53/126C07C27/02C07C51/493C07C51/43C07C51/44
Inventor 张寿贵朱新民
Owner GUANGRAO HUAYU CHEM
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