Mixed fatty acid and its prepn process and application

Abstract

The present invention relates to a kind of mixed fatty acid and its preparation process and application. The preparation process includes the following steps: 1. heating oil leftover with steam, stirring, acidifying and hot water washing to obtain neutral acidified oil; 2. separating waste water from oil leftover and repeating the step 1; 3. separating the exhausted neutral mixture waste liquid and separating suspension acting as isolating agent; 4. mixing the separated neutral acidified oil with water and hydrolysis at 120 deg.c and 1 MPa; 5. precipitating the hydrolyte to obtain black fatty acid; 6. steam dewatering black fatty acid; and 7. negative pressure distilling black fatty acid to obtain transparent liquid mixed fatty acid. The prepared mixed fatty acid has high activity, good flexibility, high flowability and low cost, and may be used as main material for producing washing powder, and in producing oleic acid, stearic acid and other products.

Description

technical field

[0001] The invention relates to a fatty acid and its preparation method and application, in particular to a mixed fatty acid prepared from vegetable oil residues and its preparation method and application. Background technique

[0002] Vegetable oil foot is the waste discharged after refining in the process of producing vegetable edible oil. Because of its high alkali content, it is difficult to directly use it. Oil foot discharge will damage the soil and cause environmental pollution. At present, although it is possible to prepare acidified oil to produce fatty acids by cooking oil feet, this method is not only extremely backward, but also requires the addition of catalysts for saponification and acidolysis, which is a non-industrial soil method. The discharged acid water and waste residue can cause new pollution and damage to lakes and soil. Therefore, it is meaningful to study a new method of preparing mixed fatty acids from vegetable oil. Contents of ...