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Method for preparing 12-hydroxy stearic acid through utilizing hydrogenerated castor oil as raw material

A technology of hydrogenated castor oil and hydroxystearic acid, applied in chemical instruments and methods, preparation of oxygen-containing compounds, preparation of organic compounds, etc., can solve the problems of yellowing in appearance color, yellowing in color of 12-hydroxystearic acid, etc. , to achieve the effect of color appearance improvement

Inactive Publication Date: 2013-09-11
SHANDONG TIANXING BIOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the traditional method of hydrogenating castor oil to prepare 12-hydroxystearic acid, there is no decolorization treatment, so the produced 12-hydroxystearic acid has a yellow appearance, and the yellow color of 12-hydroxystearic acid is because castor oil The pigments contained in these pigments have unsaturated bonds and more active groups, and it is these unsaturated bonds and more active groups that make the pigments produce colors

Method used

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  • Method for preparing 12-hydroxy stearic acid through utilizing hydrogenerated castor oil as raw material

Examples

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Effect test

Embodiment 1

[0027] Taking hydrogenated castor oil as the method for raw material preparation 12-hydroxystearic acid, specifically comprises the following steps:

[0028] Raw material selection: hydrogenated castor oil is used as raw material; the hydrogenated castor oil is obtained from castor beans through hot pressing, and then hydrogenated to obtain hydrogenated castor oil;

[0029] Saponification: add alkali to saponify hydrogenated castor oil, add alkali until the pH of the solution reaches 12, and obtain saponified product; the alkali added is sodium hydroxide; the alkali used in the following examples is sodium hydroxide;

[0030] Acidification: add acid to the saponified product, add dilute sulfuric acid until the pH reaches 2; the acid added is dilute sulfuric acid, and the dilute sulfuric acid is obtained by diluting 98% concentrated sulfuric acid with one volume of water; used in the following examples The added acid that arrives is dilute sulfuric acid, and described dilute su...

Embodiment 2

[0043] Taking hydrogenated castor oil as the method for raw material preparation 12-hydroxystearic acid, specifically comprises the following steps:

[0044] Raw material selection: hydrogenated castor oil is used as raw material; the hydrogenated castor oil is obtained from castor beans through hot pressing, and then hydrogenated to obtain hydrogenated castor oil;

[0045] Saponification: add alkali to hydrogenated castor oil for saponification, add alkali until the pH of the solution reaches 12, and obtain saponified products;

[0046] Acidification: add acid to the saponified product, add dilute sulfuric acid until the pH reaches 2;

[0047] Washing: add the same volume of water as hydrogenated castor oil, and wash with water until neutral to obtain 12-hydroxystearic acid;

[0048] Decolorization: add hydrogen peroxide for decolorization, the concentration of the hydrogen peroxide is 15%, its addition is 2% of the weight of hydrogenated castor oil, and the decolorization t...

Embodiment 3

[0052] Taking hydrogenated castor oil as the method for raw material preparation 12-hydroxystearic acid, specifically comprises the following steps:

[0053] Raw material selection: hydrogenated castor oil is used as raw material; the hydrogenated castor oil is obtained from castor beans through hot pressing, and then hydrogenated to obtain hydrogenated castor oil;

[0054] Saponification: add alkali to hydrogenated castor oil for saponification, add alkali until the pH of the solution reaches 12, and obtain saponified products;

[0055] Acidification: add acid to the saponified product, add dilute sulfuric acid until the pH reaches 2;

[0056] Washing: add the same volume of water as hydrogenated castor oil, and wash with water until neutral to obtain 12-hydroxystearic acid;

[0057] Decolorization: add hydrogen peroxide for decolorization, the concentration of the hydrogen peroxide is 30%, its addition is 2-8% of the weight of hydrogenated castor oil, and the decolorization...

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Abstract

The invention belongs to the field of stearic acid preparation, and in particular relates to a method for preparing 12-hydroxy stearic acid through utilizing hydrogenerated castor oil as a raw material. The method comprises steps of: utilizing the hydrogenerated castor oil as the raw material, saponifying, acidizing, washing, dehydrating and slicing to obtain a 12-hydroxy stearic acid product. The method is characterized by further comprising a decolorizing step after the washing step, wherein hydrogen peroxide is served as a decolorizing agent so as to complete a 12-hydroxy stearic acid decolorizing process. Compared with a conventional method, the method has an additional decolorizing step, the hydrogen peroxide is served as the decolorizing agent, other foreign ions are not introduced, and the generated product after final reaction is water which can be removed through dehydration, so that the product quality cannot be influenced; moreover, the decolorizing agent cannot damage the hydroxyl of the 12-hydroxy stearic acid.

Description

technical field [0001] The invention belongs to the field of stearic acid preparation, in particular to a method for preparing 12-hydroxystearic acid from hydrogenated castor oil. Background technique [0002] In the traditional method of hydrogenating castor oil to prepare 12-hydroxystearic acid, there is no decolorization treatment, so the produced 12-hydroxystearic acid has a yellow appearance, and the yellow color of 12-hydroxystearic acid is because castor oil These pigments have unsaturated bonds and more active groups, and it is these unsaturated bonds and more active groups that make the pigments produce colors. The conjugated system of the pigment and the more active groups are unstable, and the structure is prone to change, which not only affects the quality of 12-hydroxystearic acid itself, but also affects the quality of downstream products such as lithium-based grease, etc. Therefore, The research on the decolorization of 12-hydroxystearic acid is not only to i...

Claims

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Application Information

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IPC IPC(8): C07C59/01C07C51/487C07C27/02
Inventor 怀进步房涛赵元忠
Owner SHANDONG TIANXING BIOTECH
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