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Method for preparing 12-hydroxystearic acid from hydrogenated castor oil

A technology for hydrogenating castor oil and hydroxystearic acid, which is applied in chemical instruments and methods, preparation of oxygen-containing compounds, preparation of organic compounds, etc., and can solve problems such as yellowing of appearance and yellowing of 12-hydroxystearic acid , to achieve the effect of improving the color appearance

Inactive Publication Date: 2015-09-09
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-hydroxystearic acid from hydrogenated castor oil

Examples

Experimental program
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Effect test

Embodiment 1

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

[0028] Raw material selection: take hydrogenated castor oil as raw material; this hydrogenated castor oil is obtained by hot pressing from castor bean, and then hydrogenated to obtain hydrogenated castor oil;

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

[0030] Acidification: add acid to the saponification, 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 acid added is dilute sulfuric acid, and described dilute sulfuric acid is that the v...

Embodiment 2

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

[0044] Raw material selection: take hydrogenated castor oil as raw material; this hydrogenated castor oil is obtained by hot pressing from castor bean, and then hydrogenated to obtain hydrogenated castor oil;

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

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

[0047] Washing with water: 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 to decolorize, the concentration of described hydrogen peroxide is 15%, and its add-on is 2% by weight of hydrogenated castor oil, and the decolorization time is 20min;...

Embodiment 3

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

[0053] Raw material selection: take hydrogenated castor oil as raw material; this hydrogenated castor oil is obtained by hot pressing from castor bean, and then hydrogenated to obtain hydrogenated castor oil;

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

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

[0056] Washing with water: 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 to decolorize, the concentration of described hydrogen peroxide is 30%, and its add-on is 2-8% by weight of hydrogenated castor oil, and the decolorization time is 30mi...

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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 preparation of stearic acid, and in particular relates to a method for preparing 12-hydroxystearic acid by using hydrogenated castor oil as a raw material. Background technique [0002] In the method for preparing 12-hydroxystearic acid from traditional hydrogenated castor oil, it has not undergone decolorization treatment, so the appearance color of the 12-hydroxystearic acid produced is yellow, and the color of 12-hydroxystearic acid is yellow because of castor oil. These pigments contain unsaturated bonds and more active groups, and it is these unsaturated bonds and more active groups that make the pigments produce color. The conjugated system and more active groups of the pigment 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. Therefore, The research on 12-hy...

Claims

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Application Information

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