Dephenolizing and decoloring refining process and device for cottonseed oil

Abstract

The invention discloses a dephenolizing and decoloring refining process and device for cottonseed oil. The dephenolizing and decoloring refining process comprises the following steps of: efficiently mixing mixed cottonseed crude oil and phosphoric acid, reacting with alkali liquid in a reaction tank to finish degumming and alkali refining, precipitating and separating after finishing reaction, and pumping mixed oil into a mixed oil temporary storage tank for following refining. The dephenolizing and decoloring refining process disclosed by the invention has the advantages that: operation is simple, and a use problem of a centrifugal machine caused by unstable alkali liquid concentration and alkali addition amount in the continuous refining process is avoided; the viscosity of the mixed oil is small, and the specific gravity difference of the mixed oil with soap stock is large, so that the mixed oil and the soap stock are favorably separated, a washing process is not needed and washingwaste water is not generated; gossypol and thermosensitive substances are removed, so that the scaling of a high-temperature stage evaporator is avoided, evaporation efficiency is improved, and production energy consumption is reduced; and product indexes are better than indexes of a traditional process, a color R-value is reduced by 1.6-2.6, and in a following decoloring working section, the useamount of argil is small, the color and luster of finished-product oil are good, and the color reversion ofhe finished-product oil is not easy to generate.

Description

technical field [0001] The invention belongs to the technical field of oil refining, and in particular relates to a process and equipment for dephenolizing and decolorizing refining of cottonseed oil. Background technique [0002] my country is the main producer of cotton in the world, and cottonseed is the main by-product of cotton. In 2006 / 2007, the world's cottonseed output was 44.2 million tons, and my country's cottonseed output was 11.2 million tons. In recent years, my country's cottonseed output was 12 million to 13 million tons. Whole cottonseed contains 15% to 25% oil, and cottonseed contains 32% to 46% oil. Sufficient resource advantages provide a broad space for the development of cottonseed oil industry in my country. The traditional cottonseed oil refining process is to degumming and alkali refining the crude oil obtained after the mixed cottonseed crude oil from the extractor is steamed, steamed twice, stripped and desolventized. This traditional process mak...

AI Technical Summary

Problems solved by technology

This traditional process makes the 0.5%~2.5% gossypol which is sensitive to heat in cotton kernel easy to turn into dark denatured gossypol or combine with phospholipid at high temperature, so that the color is fixed and cannot be removed in the subsequent refining process. The color of the oil seriously affects the color and quality of the oil; in order to remove the color as much as possible, the addition of more excess alkali greatly increases the refining loss; the colloid and heat-sensitive substances in the crude oil can easily cause fouling of the evaporator in the high temperature stage, reducing evaporation Efficiency, increase the energy consumption of process production; direct contact between oil and lye, prone to saponification of neutral oil and oil emulsification, the viscosity of the alkali refining system is relatively high, and the soapstock is not easy to separate from the oil, resulting in a large amount of entrained oil and refining yield Reduced; washing waste water is easy to be generated during soapstock treatment, which is not conducive to environmental protection

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