High-acid-value rice bran oil synchronous deacidification and dewaxing process

Abstract

The invention discloses a high-acid-value rice bran oil synchronous deacidification and dewaxing process, which comprises the following steps that 1, high-acid-value rice bran crude oil is pretreated to obtain high-acid-value rice bran oil; 2, synchronous deacidification and dewaxing is carried out to obtain deacidified and dewaxed rice bran oil; 3, the deacidified and dewaxed rice bran oil is sequentially subjected to solvent recovery and decoloring treatment to obtain the low-acid-value and low-wax-content rice bran oil. The high-acid-value rice bran oil synchronous deacidification and dewaxing process provided by the invention has the advantages that lecithin is adopted and is dissolved into a 95-percent ethanol solution to form micelle, so that free fatty acid and rice bran wax are separated out to reduce the content of the free fatty acid and the rice bran wax; therefore the acid value of the rice bran oil is lowered to be below 1mg KOH/g, the wax content is lowered to be below 0.1 percent, and the deacidification rate and the dewaxing rate respectively reach higher than 95 percent. The high-acid-value rice bran oil synchronous deacidification and dewaxing process has the advantages that safety and environment protection are realized, the process is simple, the operation is convenient and fast, the cost is low, the refinery rate is high, the nutrition ingredient remaining rate is high, and the process is suitable for the production of edible grease.

Description

technical field [0001] The invention relates to an oil processing method, in particular to a synchronous deacidification and dewaxing process for rice bran oil with high acid value. Background technique [0002] my country is a big country (about 800 million people) with rice as the staple food, and the annual consumption of rice and its products is about 140 million tons. It can be seen that rice is the largest and most stable food consumption variety in my country. Rice bran is the main by-product of rice production and processing. Studies have shown that not only the oil content of rice bran is between 18% and 20%, which is close to the oil content of soybeans in my country, but also the composition of fatty acids is reasonable. Among them, oleic acid accounts for 40% to 50%, linoleic acid accounts for 29% to 42%, linolenic acid accounts for 0% to 1%, and saturated fatty acid accounts for only 14% to 23%, which is suitable for human nutritional needs healthy edible veget...

AI Technical Summary

Problems solved by technology

The existence of rice bran wax not only affects the quality of the oil, but also increases the turbidity of the oil, reduces the transparency, and affects the edible value and nutritional value of rice bran oil

Bran wax will be frozen and precipitated at about 20°C, which will increase the turbidity of the oil, so it is not sold with edible oil

At present, most factories adopt winterization and crystal growth to freeze and precipitate the wax, but the viscosity of rice bran wax is high, and it is difficult to filter the precipitated wax, which not only increases the difficulty of operation, but also reduces the service life of the filter.

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