Alkali refining process of cottonseed oil

Abstract

The invention belongs to the field of grain and oil processing and in particular relates to an alkali refining process of cottonseed oil. The process provided by the invention comprises the following steps of: (1) reducing temperature: rapidly cooling cottonseed crude oil to 20-40 DEG C; (2) removing impurities: filtering to remove impurities; (3) degumming: raising the temperature of the impurity-removed cottonseed crude oil to 60-65 DEG C; adding phosphoric acid, mixing and rapidly agitating for 0.5-1 hour; (4) carrying out alkali refining: adding alkaline liquid and uniformly mixing; then adding a sodium chloride solution, mixing, agitating and reacting for 40-60 minutes; (5) separating oil and soap: raising the temperature to 85 DEG C and then centrifuging and separating to remove nigre; (6) washing with water: adding soft water which has the temperature of 90 DEG C and is 10 wt% of the cottonseed crude oil into the oil; mixing, separating and removing wastewater to obtain the finished-product oil. The process provided by the invention has the advantages of simple process, convenience in operating and capability of increasing the refining rate of the cottonseed oil.

Description

technical field [0001] The invention belongs to the field of grain and oil processing, in particular to an alkali refining process of cottonseed oil. Background technique [0002] At present, cotton is one of the main economic crops in my country, and its output ranks first in the world. Cottonseed is the seed of cotton. The whole seed contains 10-15% oil, and the cotton kernel contains 20-30% oil. It is one of the nine major oil crops in the world. With the rapid development of China's oil consumption and feed industry, the demand for cottonseed oil, a product of cottonseed deep processing, also increases. Cottonseed oil is a high-quality edible vegetable oil. It contains a lot of essential fatty acids and has good shortening properties. It is known as a natural shortening without trans fatty acids. Cottonseed oil has become a natural substitute in many countries when the use of hydrogenated vegetable oil containing trans fatty acids is currently restricted by countries suc...

AI Technical Summary

Problems solved by technology

However, there are some shortcomings in the traditional alkali refining process. For example, after the oil temperature is raised to 80-85°C, appropriate lye is added for reaction. Since the reaction temperature is too high, if the reaction is carried out for a long time, a large amount of oil will be caused. Saponification of neutral oil; and short-term reaction, the generated soap does not have enough time to absorb gossypol, so that gossypol cannot be completely removed, making it difficult to remove the color of cottonseed oil