Method for preparing dephenolization cottonseed protein and raffinose

Abstract

The invention relates to a method for deep processing cottonseeds, in particular to a method for preparing dephenolization cottonseed protein and raffinose. Gross cottonseeds are firstly delinted by a delinting machine to obtain naked seeds; after being husked by a husking machine, the naked seeds are subjected to kernel husk separation by an angle sieve to obtain cottonseed kernels and cottonseed husks; the cottonseed kernels are subjected to softening conditioning, compacting and drying; the dried blanks are sent to an extractor by a scraper blade and a closed auger and then are sprayed in stages by the No.6 solvent oil to obtain mixed oil; the mixed oil is subjected to sedimentation and centrifugal separation and purification, then is processed by a first evaporator and a second evaporator and is processed by a stripping tower to remove the solvent to obtain crude oil; the crude oil is refined to obtain edible oil; wet cotton dregs are put in a dephenolizing extractor and are subjected to liquid separation and filtration and purification to recover the solvent and also extract the crude product of the raffinose; and after being extruded, the wet cotton dregs are subjected to drying, desolventizing and conditioning and then are sent to a grinding packing department. The process technology has the advantages of high oil yielding rate, complete dephenolization, high content of active protein, simple process and low production cost.

Description

technical field [0001] The invention relates to a deep processing method of cottonseed, in particular to a method for preparing dephenolized cottonseed protein and raffinose. Background technique [0002] my country is a major cotton-producing country in the world. In 2006, the output of cottonseed was 11 million tons, and 4.4 million tons of cotton meal could be obtained after separation and processing. In 2007, the output of cotton seed was 13 million tons, and 5.2 million tons of cotton meal could be obtained after separation and processing. The nutritional value of protein contained in cottonseed meal is close to that of bean protein. It is a good protein feed resource, and the price of cottonseed meal is lower than that of soybean meal and fish meal. It can be used to replace feed protein sources such as soybean meal and fish meal, which can not only reduce The import volume of soybean meal and fish meal saves foreign exchange and can promote the development of aquacult...

AI Technical Summary

Problems solved by technology

[0003] However, ordinary cottonseed meal contains high gossypol. When used as feed, it will cause harm to the liver and male reproductive system of livestock and poultry. It will also affect the reproductive function of animals and cause sterility, so the use is relatively narrow.

The hot pressing and leaching process used in traditional cottonseed processing not only cannot effectively remove gossypol, but also after high-temperature steaming and frying, free gossypol and amino acids in cottonseed protein combine to form bound gossypol, which not only denatures the protein, but also reduces the concentration of amino acids. content, and the nutritional value of cottonseed protein is lost, which limits the application of cottonseed protein in the feed industry

[0004] At present, there are two methods of one-step method and two-step method that are more feasible. The publication number disclosed on May 24, 2006 is the invention patent of CN1775061A "Method for producing dephenolized cotton protein by one-step method". Although the investment is low, due to the two The mixing of the two solvents makes the residual oil content in the product higher, the protein denaturation is serious, and the content is reduced; the publication number published on January 29, 2003 is the invention patent "a kind of cottonseed processing method" of CN1100134C, which adopts soaking Type of dephenolization equipment, resulting in methanol solvent and protein contact time is too long, so that part of the free gossypol into bound gossypol, reducing the content of amino acids

Traditional cottonseed processing methods have disadvantages such as inability to remove gossypol, protein denaturation, complicated process, and high cost