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Method for separating and extracting isostearic acid from monomer acid

A technology of isostearic acid and isostearate, which is applied in the field of separation and extraction of isostearic acid, can solve problems such as low antioxidant performance, high iodine value, and easy darkening of product color

Active Publication Date: 2009-09-30
YIHAI TIANCHENG LIANYUNGANG CHEM INDSCO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the obtained product has a high iodine value, the product has low oxidation resistance, and the color of the product is easy to darken.

Method used

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  • Method for separating and extracting isostearic acid from monomer acid

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Comparison scheme
Effect test

Embodiment 1

[0022] A method for separating and extracting isostearic acid from monomeric acids, comprising the following steps:

[0023] (1) Esterification of monomers

[0024] The monomeric acid and anhydrous methanol are pumped into the pipeline reactor with a pressure pump at a volume ratio of 1:1, and the feed of the monomeric acid and methanol is maintained at a pressure of 2.0MPa and a reaction temperature of 160-240°C The speed is 50L / h, react for 19 hours, when the acid value of the reactant drops below 2mgKOH / g, the methyl esterification reaction is completed, vacuumize, and distill off water and methanol at 0.07MPa and a temperature of 35-65°C to obtain monomeric acid methyl ester. Methanol can be reused after dehydration.

[0025] (2) Catalytic hydrogenation of monomeric acid ester

[0026] Add the monomeric acid methyl ester obtained in (1) into the hydrogenation reactor, drop into the Raney nickel catalyst of 0.3% of the monomeric acid weight, seal the reactor, vacuumize, ...

Embodiment 2

[0034] A method for separating and extracting isostearic acid from monomeric acids, comprising the following steps:

[0035] (1) Esterification of monomers

[0036] Pump the monomeric acid and absolute ethanol into the pipeline reactor with a pressure pump at a ratio of 1:1.1 by volume, and keep the feed of monomeric acid and ethanol under the conditions of 2.5MPa pressure and reaction temperature of 170-250°C The speed is 45L / h, react for 20 hours, when the acid value of the reactant drops below 2mgKOH / g, the esterification reaction is completed, vacuumize, and distill off ethanol under the conditions of 0.06MPa and temperature 50-70℃ to obtain monomeric acid ethyl ester. Recycled ethanol can be reused after dehydration.

[0037] (2) Catalytic hydrogenation of monomeric acid ethyl ester

[0038] Put the product obtained in (1) into the hydrogenation reaction kettle, put into the Raney nickel catalyst of 0.3% by weight of the monomeric acid, seal the reaction kettle, vacuum...

Embodiment 3

[0046] A method for separating and extracting isostearic acid from monomeric acids, comprising the following steps:

[0047] (1) Esterification of monomers

[0048] Put the monomeric acid and anhydrous isopropanol into the pipeline reactor with a pressure pump at a ratio of 1:1.1 by volume, and keep the monomeric acid and isopropyl alcohol under the conditions of 3.0MPa pressure and reaction temperature of 160-240°C The feed rate of alcohol is 40L / h, react for 21 hours, when the acid value of the reactant drops below 2mgKOH / g, the esterification reaction is completed, vacuumize, and distill and remove isopropyl under the conditions of 0.07MPa and temperature 50-70℃ alcohol to obtain isopropyl monomeric acid.

[0049] (2) Catalytic hydrogenation of monomeric acid ester

[0050] Add the monomeric acid isopropyl ester obtained in (1) into the hydrogenation reactor, drop into the Raney nickel catalyst of 0.3% by weight of the monomeric acid isopropylate, seal the reactor, and va...

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Abstract

The present invention discloses a method for separating and extracting isostearic acid from monomer acid. The present invention relates to a method for separating and extracting isostearic acid, in particular to a novel method for separating and extracting isostearic acid from monomer acid. The present invention provides a method for separating and extracting isostearic acid from monomer acid, which is suitable for use in commercial production. The method is characterized in: esterify the byproduct (monomer acid) obtain in production of dimer acid through bleaching earth catalytication process under medium pressure without catalyst to obtain monomer acid ester, treat by catalytic hydrogenation under medium pressure, and filter to obtain hydrogenised monomer acid ester; envelope with carbamide, filter, separate, and wash with water to obtain crude product of isostearic acid ester; perform molecular distillation to obtain refined isostearic acid ester, and then perform hydrolysis to obtain isostearic acid. Compared to the separation and extraction technique in the prior art, the present invention has the following advantages: the acidity and viscosity are low during hydrogenisation, and therefore the service life of catalyst is long, no nickel soap will be formed, and the corrosion to equipment is reduced; the product can be enveloped and separated by carbamide more easily; the distillation can be performed at a lower temperature; the iodine value of final product is low, the color is light, and the purity is high.

Description

technical field [0001] The invention relates to a method for separating and extracting isostearic acid, in particular to a novel method for separating and extracting isostearic acid from monomeric acids. Background technique [0002] Isostearic acid is C 16 -C 20 The mixed fatty acid with branched chain can be synthesized with fatty alcohol, and can also be separated and extracted from the by-product monomer acid when using vegetable oleic acid as raw material to synthesize dimer acid by clay catalysis. [0003] When three molecules of oleic acid are catalyzed by clay to synthesize dimer acid, a molecule of dimer acid is generated, and a molecule of isostearic acid is simultaneously generated. The monomeric acid is composed of unreacted saturated fatty acid in raw materials, isostearic acid generated by hydrogen ion migration during polymerization, and unreacted unsaturated fatty acid. In the production of dimer acid, the mass fraction of dimer acid and 35% monomeric acid...

Claims

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Application Information

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IPC IPC(8): C07C53/126C07C51/493C07C51/50C07C51/09A61K8/36
Inventor 肖洪波黄荣来陈耀然刘春辉黄荣模吴国亮刘小弟黄宽黄清华
Owner YIHAI TIANCHENG LIANYUNGANG CHEM INDSCO
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