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Preparation method for natural isostearic acid

A technology of isostearic acid and stearic acid, applied in the field of preparation of natural isostearic acid, can solve the problems of increasing side reactions, affecting product quality and yield, and complicated processes, reducing pollution and achieving high utilization rate of raw materials. , good color effect

Inactive Publication Date: 2013-10-23
陈春林
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although the monoacid is esterified and hydrogenated, and then the isostearate is separated by solvent method or urea envelopment; the isostearate is hydrolyzed or saponified-acidification method to obtain isostearic acid, the process is cumbersome and multi-channel processing Increased side reactions, affecting product quality and yield

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] In this example, the raw material monoacid is first subjected to pressurized catalytic hydrogenation to obtain hydrogenated monoacid, and then the hydrogenated monoacid is separated in a solvent by urea envelope to obtain crude isostearic acid and stearic acid, and the isostearic acid The crude product was distilled under reduced pressure to obtain isostearic acid product.

[0027] The raw material monoacid is a by-product monoacid produced during the production of dimer acid by thermal polymerization of oleic acid.

[0028] The step of pressurized catalytic hydrogenation of the single acid is that the single acid is under the action of the nickel-containing composite catalyst R1, the pressure is controlled at 0.05MPa, the temperature is controlled at 100°C, and hydrogen gas is introduced to react for 3 hours. After the reaction is completed, it is cooled and filtered out. Catalyst, the obtained filtrate is hydrogenated monoacid.

[0029] Described hydrogenated monoaci...

Embodiment 2

[0039] In this example, the raw material monoacid is first subjected to pressurized catalytic hydrogenation to obtain hydrogenated monoacid, and then the hydrogenated monoacid is separated in a solvent by urea envelope to obtain crude isostearic acid and stearic acid, and the isostearic acid The crude product was distilled under reduced pressure to obtain isostearic acid product.

[0040] The raw material monoacid is a by-product monoacid produced during the production of dimer acid by linoleic acid clay catalysis.

[0041] The step of pressurized catalytic hydrogenation of the single acid is that the single acid is under the action of the nickel-containing composite catalyst R1, the pressure is controlled at 1.0 MPa, the temperature is controlled at 180°C, and the hydrogen gas is introduced to react for 4 hours. After the reaction is completed, it is cooled and filtered out. Catalyst, the obtained filtrate is hydrogenated monoacid.

[0042] Described hydrogenated monoacid ur...

Embodiment 3

[0053] In this example, the raw material monoacid is first subjected to pressurized catalytic hydrogenation to obtain hydrogenated monoacid, and then the hydrogenated monoacid is separated in a solvent by urea envelope to obtain crude isostearic acid and stearic acid, and the isostearic acid The crude product was distilled under reduced pressure to obtain isostearic acid product.

[0054] The raw material monoacid is a by-product monoacid produced during the production of dimer acid by thermal polymerization of linoleic acid.

[0055] The octadecyl unsaturated fatty acid may be oleic acid, linoleic acid and the like.

[0056] The step of pressurized catalytic hydrogenation of the single acid is that the single acid is under the action of the nickel-containing composite catalyst R2, the pressure is controlled at 1.4 MPa, the temperature is controlled at 200 ° C, and the hydrogen gas is passed into the reaction for 5 hours. After the reaction is completed, it is cooled and filte...

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Abstract

The invention relates to a manufacturing method for a natural chemical, specifically to a preparation method for natural isostearic acid. The preparation method comprises the following steps: subjecting the raw material monomer acid to pressurized catalysis and hydrogenation so as to obtain hydrogenated monomer acid; then subjecting hydrogenated monomer acid to urea inclusion and separation in a solvent so as to obtain a crude isostearic acid product and stearic acid; and finally subjecting the crude isostearic acid product to reduced pressure distillation so as to obtain an isostearic acid product. The method has the advantages of short flow, simple operation, omission of procedures like esterification, hydrolysis, saponification and acidification, conservation of time and energy, usage of the cheap and easily available raw material and the easily available solvent, a high utilization rate of the raw material, small toxicity, few by-products, reduction of environmental pollution, suitability for large-scale application and good economic and social benefits.

Description

technical field [0001] The invention relates to a method for producing natural chemicals, in particular to a method for preparing natural isostearic acid. [0002] Background technique [0003] Isostearic acid is a mixture of methyl branched chain fatty acids, which has the characteristics of both oleic acid and stearic acid. As an important industrial raw material with unique properties, isostearic acid has been widely used in various fields. In the textile industry, isostearic acid is used as a fiber softener such as spadex softener for polyurethane elastic fibers, and its alkali metal and its ammonium salts are effective softeners and wetting agents; in the lubrication industry, isostearic acid and its derivatives Used to prepare engine and gear lubricating oils and greases, such as jet and turbine engine lubricants, automatic transmission and braking device lubricating oils and greases; in the cosmetics industry, there are more than a dozen commercially available isoste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C53/126C07C51/36C07C51/42
Inventor 陈春林
Owner 陈春林
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