Continuous hydrolysis method for oil foots and soap foots

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...

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

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