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Extraction method of flaxseed oil

A technology of linseed oil and extraction method, which is applied in the direction of fat oil/fat production and fat generation, can solve the problems of high equipment investment and operating conditions, unsuitable for industrial application, and long time consumption, and achieve high added value Processing, beneficial to comprehensive utilization, simple and fast operation

Active Publication Date: 2017-05-10
INST OF BAST FIBER CROPS CHINESE ACADEMY OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the processing of linseed is mainly based on the extraction of oil, and most of them use the traditional vegetable oil extraction process of pressing and leaching. The heat process involved is extremely unfavorable to the stability of linseed oil rich in linolenic acid, while linseed oil extraction The final cake is used as feed, without further processing, and the utilization rate is not high
[0004] The extraction and purification research of flax lignans is constantly being carried out. The traditional organic solvent extraction is the main method. The solvents used are mainly methanol, ethanol, acetone, etc. The techniques used include microwave-assisted extraction, ultrasonic-assisted extraction, supercritical extraction, Accelerated solvent extraction, etc., but consumes a lot of solvent, takes a long time, and the extraction efficiency is also low
There is an attempt to extract lignans from defatted linseed powder with subcritical water. This accelerated solvent extraction method avoids the use of organic solvents, and the yield is satisfactory, but the method requires high equipment investment and operating conditions. Not yet suitable for industrial applications (Journal of FoodEngineering, 2006, 77: 1087-1095)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Flaxseeds for oil extraction, after impurity removal, drying, and crushing, pass through a 60-mesh sieve (the temperature of the flaxseeds should be kept ≤ 60°C during the process), put them into the extraction tank, and after vacuuming to below 0.01MPa, add raw materials weighing 4 times the mixed solvent (the volume ratio of alkaline ethanol and subcritical propane is 3:20, and the alkaline ethanol is a solution dissolved with 10% by mass of sodium hydroxide). The operating temperature is 50°C (the operating pressure is the corresponding vapor pressure, 0.3 ~0.8Mpa), after 30 minutes each time, a total of 5 times of extraction, the oil and solvent mixture was obtained; the oil and solvent mixture was gasified under reduced pressure, and the gauge pressure reached 0MPa and then vacuumed for precipitation, when the gauge pressure was -0.09MPa , The temperature is 40~50 ℃, and the desolvation linseed oil can be obtained after maintaining for 30 minutes. The extraction rat...

Embodiment 2

[0034] Flaxseeds for oil extraction, after impurity removal, drying and crushing, pass through a 60-mesh sieve (the temperature of the flaxseeds should be kept ≤ 60°C during the process), put them into the extraction tank, and after vacuuming to below 0.01MPa, add raw materials weighing 3 times the mixed solvent (the volume ratio of alkaline ethanol and subcritical propane is 5:20, and the alkaline ethanol is a solution dissolved with 5% by mass of sodium hydroxide). The operating temperature is 60°C (the operating pressure is the corresponding vapor pressure, 0.3 ~0.8Mpa), after 60 minutes each time, a total of 3 extractions, the mixture of oil and solvent was obtained; the mixture of oil and solvent was gasified under reduced pressure, and the gauge pressure reached 0MPa, and then vacuumized for precipitation, when the gauge pressure was -0.09MPa , The temperature is 40~50℃, and the desolvation linseed oil can be obtained after maintaining for 30 minutes. The extraction rate ...

Embodiment 3

[0037]Flaxseeds for oil extraction, after removing impurities, drying, and crushing, pass through a 60-mesh sieve (the temperature of the flaxseeds should be kept ≤ 60°C during the process), put them into the extraction tank, and after vacuuming to below 0.01MPa, add raw materials weighing 6 times the mixed solvent (the volume ratio of alkaline ethanol and subcritical propane is 1~20, and alkaline ethanol is a solution dissolved with 8% by mass of sodium hydroxide). The operating temperature is 40°C (the operating pressure is the corresponding vapor pressure, 0.3 ~0.8Mpa), after 40 minutes each time, a total of 4 extractions, the mixture of oil and solvent was obtained; the mixture of oil and solvent was gasified under reduced pressure, and the gauge pressure reached 0MPa, and then vacuumized for precipitation, when the gauge pressure was -0.09MPa , The temperature is 40~50°C, keep for 30 minutes to obtain presolvated linseed oil, which contains residual solvent ≤ 30mg / kg, impu...

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Abstract

The invention relates to an extraction method of flaxseed oil. The extraction method comprises the following steps: adopting a mixed solvent of alkaline ethanol and sub-critical propane as an extraction medium; carrying out extracting under the conditions that the temperature is 35 to 60 DEG C and the pressure is 0.3 to 0.8Mpa; after extraction, separating the raw materials from an extracting solution; removing the solvent by using the extracting solution to obtain the flaxseed oil. The temperature of the whole operation process is smaller than or equal to 60 DEG C, and better facilitates the stabilization of functional components such as the flaxseed oil and lignan; in addition, degreased flaxseed meal has no change in color or property, and secondary depth development of flaxseed gum extraction and the like can be realized; according to a method for extracting the flaxseed oil by adopting the mixed solvent of the ethanol and the sub-critical propane as the extraction medium, functional flaxseed oil with high contents of the lignan and linolenic acid is obtained at one step and is higher in added value; the extraction method is simple and quick in operation process, low in energy consumption and high in extraction efficiency, and facilitates comprehensive utilization and high added value processing of the raw materials.

Description

technical field [0001] The invention relates to a method for preparing vegetable oil, in particular to a method for extracting linseed oil. Background technique [0002] Flax (Linum usitatissimum L), also known as flax, is one of the oldest crops. There are three varieties for oil, fiber, and dual-purpose oil and fiber. The seeds can be used for oil extraction. Linseed has become the seventh largest oil crop in the world and the fourth largest oil crop in my country. In recent decades, the bioactive components in flaxseed have been gradually discovered and recognized by researchers. The first is flaxseed oil, which contains 14-18% linoleic acid and as high as 45-52% linolenic acid. Prevention of disease is of great help. As a great source of omega-3 polyunsaturated fatty acids, flaxseed oil has become an important alternative to fish oil. The rich soluble dietary fiber in flaxseed—flaxseed gum has also attracted the attention of researchers. It is mainly composed of polys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C11B1/04C11B1/10
CPCC11B1/04C11B1/10
Inventor 陈安国杨继国李德芳李建军唐慧娟黄思齐李辉赵立宁
Owner INST OF BAST FIBER CROPS CHINESE ACADEMY OF AGRI SCI
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