Method for preparing hydroxy fatty acids by utilizing swill-cooked dirty oil

A technology of hydroxy fatty acid and waste oil, which is applied in the chemical field, can solve the problem of secondary utilization of waste oil, etc., and achieve the effect of simple process and stable product

Inactive Publication Date: 2014-04-02
BEIJING UNIV OF AGRI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to provide a method for preparing hydroxy fatty acid from waste oil, so as to solve the problem of secondary utilization of waste oil, and provide a new way for the production of hydroxy fatty acid at the same time

Method used

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  • Method for preparing hydroxy fatty acids by utilizing swill-cooked dirty oil

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specific Embodiment 1

[0055] Waste oil pretreatment: Now stir and heat the recovered 10kg waste oil to 85°C, keep it warm for 20 minutes, cool down to settle, and centrifuge to separate out impurities; Activated clay was added to the waste oil from which impurities were separated, and the quality of the added activated clay was 0.3 kg; heated to 95° C., kept for 1 hour, filtered to remove the activated clay, and 9.4 kg of refined waste oil was obtained.

[0056] Preparation of waste oil fatty acid: add 9.4 kg of refined waste oil to the reaction kettle according to the ratio, then add 3.66 kg of sodium hydroxide solution with a mass concentration of 35%, heat up to 75 ° C, and react for 3 hours to obtain waste oil fatty acid sodium salt Cool down to 60°C, then add 3.25kg of concentrated hydrochloric acid with a mass concentration of 37% to the system, raise the temperature to 65°C, and react for 2 hours to obtain a mixture of waste oil fatty acids, leave it to separate and separate, and the upper la...

specific Embodiment 2

[0061] Waste oil pretreatment: Stir and heat 10kg of recovered waste oil to 90°C, keep it warm for 25 minutes, cool down to settle, and centrifuge to separate impurities; further decolorize and remove impurities from the waste oil that has been initially removed, and activate clay Add to the sewer oil centrifuged to separate impurities, the quality of the added activated clay is 0.4kg, heat to 100 ℃, keep warm for 1.5 hours, filter and remove the activated clay to obtain 9.25kg of refined waste oil.

[0062] Preparation of waste oil fatty acid: Add 9.25 kg of refined waste oil into the reaction kettle according to the proportion, then add 3.79 kg of sodium hydroxide solution with a mass concentration of 35%, raise the temperature to 80°C, and react for 3.5 hours to obtain waste oil fatty acid salt. Lower the temperature to 60°C, add 3.41 kg of concentrated hydrochloric acid with a mass concentration of 37% to the system, raise the temperature to 70°C, and react for 2 hours to o...

specific Embodiment 3

[0067] Waste oil pretreatment: Stir and heat recovered 10kg waste oil to 100°C, keep it warm for 25 minutes, cool down for sedimentation, and centrifuge to separate out impurities; further decolorize and remove impurities from the waste oil that has been initially removed. White clay is added in the waste oil of preliminary impurity removal, the quality of the added activated clay is 0.45kg, is heated to 110 ℃, is incubated for 1.5 hours, and the activated clay is removed by filtration to obtain 9.13kg of refined waste oil.

[0068] Preparation of waste oil fatty acid: Add 9.13 kg of refined waste oil into the reaction kettle according to the proportion, then add 3.92 kg of sodium hydroxide solution with a mass concentration of 35%, raise the temperature to 85°C, and react for 4 hours to obtain waste oil fatty acid sodium salt. Lower the temperature to 60°C, add 3.73 kg of concentrated hydrochloric acid with a mass concentration of 37% to the system, raise the temperature to 75...

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Abstract

The invention relates to the field of chemistry and in particular relates to a method for preparing hydroxy fatty acids by utilizing swill-cooked dirty oil. The method comprises the following steps: pretreating the swill-cooked dirty oil to obtain refined swill-cooked dirty oil; putting the obtained refined swill-cooked dirty oil into a reaction kettle, and performing saponification to obtain sodium aliphatate, adding concentrated hydrochloric acid into the sodium aliphatate to prepare swill-cooked dirty oil fatty acids; adding a mixed solution prepared by mixing formic acid and a hydrogen peroxide solution into the swill-cooked dirty oil fatty acids, and reacting to obtain swill-cooked dirty oil epoxidized fatty acids; and hydrolyzing the swill-cooked dirty oil epoxidized fatty acids, and reacting to obtain the crude hydroxy fatty acids. The high-quality hydroxy fatty acids are obtained through preparation, and a technical route is provided for preparing the swill-cooked dirty oil into an intermediate with high additional value, so that the swill-cooked dirty oil is subjected to reasonable secondary utilization. Moreover, the process is simple, the product is stable, the hydroxyl value is in a range from 243 to 271 mg / KOH / g, the iodine value is less than 2.75mgI2 / 100g, and the conversion rate is 89-93 percent.

Description

technical field [0001] The invention relates to the field of chemistry, in particular to a method for preparing hydroxy fatty acid from waste oil. Background technique [0002] Hydroxy fatty acid is an important chemical intermediate. The hydroxyl on the fatty acid side chain is chemically active and can undergo reactions such as esterification, cracking, epoxidation, amidation and dehydration. Hydroxy fatty acids are widely used in mechanical and metal industries, surfactants, lubricating oils, cosmetics, polymer compounds, etc. [1]. Castor oil is the only vegetable oil containing hydroxy fatty acids in nature. Industrially, hydroxy fatty acids are produced by hydrolyzing castor oil. [0003] The progress of biotechnology has provided a new way for the preparation of hydroxy fatty acids, and the research on the use of microbial cells and enzymes to produce hydroxy fatty acids has made great progress in recent years. The scientific research team of Qingdao Institute of Bio...

Claims

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Application Information

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IPC IPC(8): C11C1/02C11C1/04
Inventor 刘灿荣龙马兰青杨明峰赵晓萌王燕李钧涛黄体冉
Owner BEIJING UNIV OF AGRI
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