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Continuous hydrolysis method for oil foots and soap foots

A technology of soapstock and oilstock, which is applied in the field of continuous hydrolysis of oilstock and soapstock to prepare high value-added products. It can solve the problems of increased material side reactions, environmental and water pollution, and low acid value of acidified oil to reduce emissions. The effect of less waste water and simple process

Inactive Publication Date: 2017-01-04
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, for the utilization of oil and soapstock, concentrated sulfuric acid acidification is commonly used to prepare acidified oil, that is, it is acidified with 5-10% concentrated sulfuric acid for a long time. Its application and promotion, and this method has serious disadvantages, causing serious environmental and water pollution, has been banned by environmental protection departments in many places.
In recent years, some new hydrolysis process technologies have also been reported. For example, the invention CN103666768B announced a high-temperature and high-pressure hydrolysis process. The reaction temperature is 210-260°C and the pressure is as high as 18-30MPa. The reaction conditions require high equipment and are intermittent Formula reaction; Invention CN102776074A discloses a kind of acidification of oil feet to prepare acidified oil, and the acidified oil is further hydrolyzed through a hydrolysis tower, the reaction steps are cumbersome, the time is long, and a large amount of waste water is produced; Invention CN1304545C has announced a kind of A method for the preparation of fatty acids by non-catalytic continuous hydrolysis of fats and oils. The reaction requires near-critical conditions at a temperature of 250-350°C and a reaction pressure of 5-20 MPa.
These technologies all have complicated process flow, a lot of waste water, and the increase of side reactions of materials under high temperature and high pressure reaction, which will damage the material components and affect product quality; the reaction conditions are harsh, and it is not conducive to industrialization and continuous production of industrialization

Method used

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  • Continuous hydrolysis method for oil foots and soap foots

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Add the oil foot and soap stock to the mixing kettle, and add 40% water of the oil foot and soap stock mass, dropwise add 80wt.% acetic acid until the pH value of the mixture is 6, stir until uniform; The final liquid material is sent to a preheater at 200-210 ° C; the preheated material is sent to a pipeline continuous reactor for reaction, the reaction temperature is 210 ° C, the pressure is 1.6 MPa, and the control material flows through the pipeline reaction The residence time of the reactor was 50 min; after the reaction, the material was separated to obtain crude fatty acid, solid residue and waste water. The acid value of the crude fatty acid was determined to be 185 mgKOH / g, and the yield was 55%. The pH value of the waste water was 6, and in the waste water Contains 15wt.% glycerin.

Embodiment 2

[0023] Add the oily bottoms and soapstocks to the mixing kettle, add 32% water of the oily bottoms and soapstocks, add dropwise a concentration of 35 wt.% formic acid until the pH of the mixture is 6, and stir until uniform; The homogenized liquid material is sent to a preheater at 170-180 °C; the preheated material is sent to a pipeline continuous reactor for reaction, the reaction temperature is 180 °C, the pressure is 0.6 MPa, and the material flows through the pipeline type continuous reactor. The residence time of the reactor was 20 min; after the reaction, the material was separated to obtain crude fatty acid, solid residue and waste water. The acid value of the crude fatty acid was measured to be 175 mgKOH / g, and the yield was 42%. The pH value of the waste water was 6, and the waste water Contains 8wt.% glycerin.

Embodiment 3

[0025] Add oil foot and soap stock to the mixing kettle, and add oil foot and soap stock quality 36% water, drop concentration is 70 wt.% acetic acid and concentration is 50 wt.% phosphoric acid to the pH value of mixed solution 6. Stir until uniform; send the mixed liquid material into a preheater at 190-200°C; send the preheated material into a pipeline continuous reactor for reaction at a reaction temperature of 200°C and a pressure of 1.0 MPa, the residence time of the control material flowing through the pipeline reactor is 40 min; after the reaction, the material is separated to obtain crude fatty acid, solid residue and waste water. The acid value of the crude fatty acid is 180 mgKOH / g, and the yield is 48%. The pH of the wastewater was 6, and the wastewater contained 12 wt.% glycerol.

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Abstract

A continuous hydrolysis method for oil foots and soap foots includes the steps that the oil foots and the soap foots are added into a mixing kettle, water is added, acid is dropwise added till the pH value of the mixed materials is 6, and the materials are stirred to be uniform, wherein the water added into the blending kettle accounts for 30%-40% of the mass of the oil foots and the soap foots; the uniform liquid materials are fed into a preheater to be preheated to 150-230 DEG C; the preheated materials enter a continuous reactor to react, the materials are separated after the reaction is finished, and crude fatty acid, solid residues and waste water are obtained. The technology is simple and continuous; acidification and hydrolysis of the oil foots and the soap foots are completed in one step, and the process is simple; besides, continuous production and operation can be carried out through the continuous reactor, and thus the production efficiency can be greatly improved.

Description

technical field [0001] The invention belongs to the technical field of development and utilization of oil refining waste, and in particular relates to a method for preparing high value-added products through continuous hydrolysis of oil and soap stock. Background technique [0002] With the rapid development of the oil industry and the continuous improvement of oil refining technology, the output of by-products such as oil feet and soap feet in the oil refining process is increasing day by day. Oil foot is produced by the hydration and degumming process of oil, mainly containing phospholipids, water, oil and gum, of which the total fatty acid content is 20-40%; soap foot is produced by alkali refining and deacidification process, and the content of soap (sodium fatty acid) in soap foot The content of neutral oil (glyceride) is 8-27%, and the rest are water, protein, pigment and other substances, of which the total fatty acid content is as high as 40-80%. [0003] my count...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C11B13/00C11B13/02C11C1/04C11C1/08
Inventor 蒋剑春刘朋徐俊明李静王奎夏海虹周铭昊叶俊
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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