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Method for separately leaching out low temperature pressed cotton seed kernel cake with No.6 solvent oil and ethynol

A technology of pressing cake and solvent oil, which is applied in the direction of fat oil/fat production, fat oil/fat refining, fat production, etc. It can solve the problem of increasing the loss of No. 6 solvent oil, difficulty in ensuring the residual oil rate of degreased cotton meal, and increasing heat energy consumption, etc. problems, achieving significant economic and social benefits, beneficial to solvent recovery, and short degreasing and leaching time

Inactive Publication Date: 2007-04-11
WUHAN POLYTECHNIC UNIVERSITY +1
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

But there is following deficiency in this method: 1, directly leaching grease with No. 6 solvent oil through softening, pressing, drying cotton kernel, because the oil content of cotton kernel is up to about 37%, not only makes process route complicated, equipment investment is big , the consumption of heating steam is large, and it is difficult to ensure that the residual oil rate of degreased cottonseed meal is below 1.5%; 2. The gossypol is directly extracted from degreased cottonseed meal without precipitation recovery, which increases the loss of No. 6 solvent oil; 3. , especially the use of methanol as the solvent for dephenolization, not only because of the high toxicity of methanol, will infringe the health of operators and affect the safety of cottonseed protein products, but also because of the high latent heat of vaporization of methanol, when recovering wet meal and ethanol When the solvent in the leaching solution increases the heat energy consumption
Moreover, since methanol is a non-renewable solvent chemically synthesized from coal, coke, crude oil and natural gas, it consumes a large amount of energy

Method used

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  • Method for separately leaching out low temperature pressed cotton seed kernel cake with No.6 solvent oil and ethynol

Examples

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Embodiment 1

[0014] Embodiment 1: The light cottonseed after develvet is shelled by the shelling unit and separated from the kernel and shell to obtain cotton kernel and cotton shell. The shell content rate in the kernel is 8%, and the kernel content rate in the shell is <1%. Use a low-temperature screw oil press (the low-temperature screw oil press shown in Chinese patent ZL02290849.8 can be used), and press the oil at a low temperature of 50°C to obtain a cotton kernel low-temperature pressed cake with a residual oil rate of 14%. and cotton kernel low-temperature pressed oil; the cotton kernel low-temperature pressed cake is extracted with No. 6 solvent oil in the first extractor, the extraction temperature is 50°C, the solvent ratio is 1:1, and the extraction time is 90 minutes. The mixed oil is evaporated, After stripping, cottonseed crude oil is obtained, and then refined to obtain edible cottonseed oil, which contains soluble wet cypress, and is passed through a low-temperature desolv...

Embodiment 2

[0015] Example 2: The shell rate in the kernel is 10%, and the oil is squeezed at a low temperature at a temperature of 35°C to obtain a cotton kernel low-temperature pressed cake with a residual oil rate of 16%, and the extraction temperature of oil is extracted with No. 6 solvent oil 55°C, the solvent ratio is 1.2:1, the leaching time is 120 minutes, and the residual oil rate of the degreased cottonwood obtained by low-temperature precipitation at a temperature lower than 80°C is 1.5%, the water content is 7.5%, and the concentration is 95%. % ethanol at 50°C with a solvent ratio of 1.3:1 for 110 minutes for leaching and dephenolization, and the dephenolized wet meal after draining is extruded by an extruder to extrude part of the ethanol leachate, and then dried at low temperature. When the temperature is 80°C, the protein content is 53%, the residual oil rate is 1.2%, the free gossypol is less than 0.045%, and the residual soluble cottonseed protein is less than 500ppm. Dis...

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Abstract

The present invention relates to cotton seed processing technology, and is especially the process of low temperature squeezing cotton seed kernel and leaching the cotton seed kernel cake with No. 6 solvent oil and ethanol. The process includes the following steps: squeezing separated cotton seed kernel at low temperature, leaching out oil from squeezed cotton seed kernel cake with No. 6 solvent oil, evaporating the mixed oil, steam stripping to obtain crude cotton seed oil, recovering solvent from the wet cake at low temperature to obtain defatted cotton seed cake, leaching out gossypol from the defatted cotton seed cake with ethanol, squeezing out ethanol from the wet the cotton seed cake, low temperature drying the cake to obtain cotton seed protein, distilling the ethanol leached liquid and recovering after rectification. The present invention has the advantages of short leaching time, small solvent ratio, and being favorable to recovering solvent.

Description

technical field [0001] The invention relates to a processing method of cottonseed, in particular to a method for extracting oil and removing phenols step by step from cottonseed low-temperature pressed cake by using No. 6 solvent oil and ethanol respectively. Background technique [0002] In order to make full use of cottonseed resources, people have carried out a lot of research on the dephenolization technology of cottonseed meal, mainly including: chemical method, microbial fermentation method and solvent extraction method. Among them, chemical method and microbial fermentation method can solve the problem of dephenolization, but due to It cannot solve the problems of completely removing the total gossypol, which leads to the reduction of the nutritional value of cottonseed protein, and is rarely used. The solvent extraction method can remove phenols from cottonseed meal at low temperature, so it can overcome the problem of protein denaturation, and can completely remove ...

Claims

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Application Information

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IPC IPC(8): C11B1/06C11B3/00
Inventor 刘晔方雪华刘大川余安甫徐小胜
Owner WUHAN POLYTECHNIC UNIVERSITY
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