Method for separating and extracting isostearic acid from monomer acid

A technology of isostearic acid and isostearic acid ester, which is applied in the field of separation and extraction of isostearic acid, can solve the problems of low antioxidant performance, high iodine value, and easy to darken product color, so as to avoid corrosion and improve the Efficiency and service life effects

Active Publication Date: 2014-03-05
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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Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0023] (1) Monomer esterification

[0024] The monomer 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 monomer acid and methanol is maintained at a pressure of 2.0 MPa and a reaction temperature of 160-240°C. The speed is 50L / h, and the reaction is 19 hours. When the acid value of the reactant drops below 2mgKOH / g, the methyl esterification reaction is completed, vacuum is applied, and water and methanol are distilled off at 0.07MPa and temperature 35-65°C to obtain Monomer acid methyl ester. The methanol can be reused after dehydration.

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

[0026] Add the monomeric acid methyl ester obtained in (1) into the hydrogenation reaction kettle, put in the Raney nickel catalyst with 0.3% of the monomer acid weight, seal the reaction kettle,...

Embodiment 2

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

[0035] (1) Monomer esterification

[0036] The monomer acid and anhydrous ethanol are pumped into the pipeline reactor with a pressure pump at a volume ratio of 1:1.1, and the monomer acid and ethanol are maintained at a pressure of 2.5 MPa and a reaction temperature of 170-250°C. The speed is 45L / h, and the reaction is 20 hours. When the acid value of the reactant drops below 2mgKOH / g, the esterification reaction is completed, vacuum is applied, and the ethanol is distilled off at 0.06MPa and temperature 50-70℃ to obtain monomer acid Ethyl ester. The recovered ethanol can be reused after dehydration.

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

[0038] Add the product obtained in (1) into the hydrogenation reactor, put in the Raney nickel catalyst of 0.3% by weight of monomer acid, seal the reactor, and evacuate. When the pressure in the reactor r...

Embodiment 3

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

[0047] (1) Monomer esterification

[0048] The monomer acid and anhydrous isopropanol are pumped into the pipeline reactor with a pressure pump at a volume ratio of 1:1.1, and the monomer acid and isopropanol are maintained at a pressure of 3.0MPa and a reaction temperature of 160-240℃. The feed rate of the alcohol is 40L / h, and the reaction is 21 hours. When the acid value of the reactant drops below 2mgKOH / g, the esterification reaction is completed, vacuum is applied, and isopropyl is distilled off at 0.07MPa and temperature 50-70°C. Alcohol to obtain monomeric acid isopropyl ester.

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

[0050] Put the isopropyl monomer acid obtained in (1) into the hydrogenation reactor, put in the Raney nickel catalyst of 0.3% by weight of isopropyl monomer acid, seal the reactor and evacuate. When the pressure in the kettle ...

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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, and more specifically to a new method for separating and extracting isostearic acid from monomer acids. Background technique [0002] Isostearic acid is C 16 -C 20 The branched mixed fatty acids can be synthesized with fatty alcohols, and can also be separated and extracted from the by-product monomeric acid when using vegetable oleic acid as the raw material to synthesize dimer acid by the clay catalyst method. [0003] When three molecules of oleic acid are catalyzed by clay to synthesize dimer acid, one molecule of dimer acid is generated, and one molecule of isostearic acid is simultaneously generated. Monomer acids are composed of saturated fatty acids that are not involved in the reaction in the raw materials, isostearic acid generated by the migration of hydrogen ions during the polymerization process, and unreacted unsaturated fatty acids. The production of dimer acid ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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