CN112868818A - High linoleic acid cottonseed oil and preparation method thereof - Google Patents

High linoleic acid cottonseed oil and preparation method thereof Download PDF

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Publication number
CN112868818A
CN112868818A CN202110264095.8A CN202110264095A CN112868818A CN 112868818 A CN112868818 A CN 112868818A CN 202110264095 A CN202110264095 A CN 202110264095A CN 112868818 A CN112868818 A CN 112868818A
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acid
oil
cottonseed
cottonseed oil
linoleic
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Inventor
夏运贞
夏慧慧
郭联兵
李普选
孟晓鹏
董建锋
赵光辉
杨啸宇
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Zhengzhou Yuanyang Edible Oils Engineering & Technology Co ltd
Kuitun Yunzheng Oil Co ltd
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Zhengzhou Yuanyang Edible Oils Engineering & Technology Co ltd
Kuitun Yunzheng Oil Co ltd
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    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23D—EDIBLE OILS OR FATS, e.g. MARGARINES, SHORTENINGS, COOKING OILS
    • A23D9/00—Other edible oils or fats, e.g. shortenings, cooking oils
    • A23D9/007—Other edible oils or fats, e.g. shortenings, cooking oils characterised by ingredients other than fatty acid triglycerides
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11B—PRODUCING, e.g. BY PRESSING RAW MATERIALS OR BY EXTRACTION FROM WASTE MATERIALS, REFINING OR PRESERVING FATS, FATTY SUBSTANCES, e.g. LANOLIN, FATTY OILS OR WAXES; ESSENTIAL OILS; PERFUMES
    • C11B1/00—Production of fats or fatty oils from raw materials
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11B—PRODUCING, e.g. BY PRESSING RAW MATERIALS OR BY EXTRACTION FROM WASTE MATERIALS, REFINING OR PRESERVING FATS, FATTY SUBSTANCES, e.g. LANOLIN, FATTY OILS OR WAXES; ESSENTIAL OILS; PERFUMES
    • C11B1/00—Production of fats or fatty oils from raw materials
    • C11B1/02—Pretreatment
    • C11B1/04—Pretreatment of vegetable raw material
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11B—PRODUCING, e.g. BY PRESSING RAW MATERIALS OR BY EXTRACTION FROM WASTE MATERIALS, REFINING OR PRESERVING FATS, FATTY SUBSTANCES, e.g. LANOLIN, FATTY OILS OR WAXES; ESSENTIAL OILS; PERFUMES
    • C11B1/00—Production of fats or fatty oils from raw materials
    • C11B1/06—Production of fats or fatty oils from raw materials by pressing
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11B—PRODUCING, e.g. BY PRESSING RAW MATERIALS OR BY EXTRACTION FROM WASTE MATERIALS, REFINING OR PRESERVING FATS, FATTY SUBSTANCES, e.g. LANOLIN, FATTY OILS OR WAXES; ESSENTIAL OILS; PERFUMES
    • C11B3/00—Refining fats or fatty oils
    • C11B3/001—Refining fats or fatty oils by a combination of two or more of the means hereafter
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11B—PRODUCING, e.g. BY PRESSING RAW MATERIALS OR BY EXTRACTION FROM WASTE MATERIALS, REFINING OR PRESERVING FATS, FATTY SUBSTANCES, e.g. LANOLIN, FATTY OILS OR WAXES; ESSENTIAL OILS; PERFUMES
    • C11B3/00—Refining fats or fatty oils
    • C11B3/006—Refining fats or fatty oils by extraction
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11B—PRODUCING, e.g. BY PRESSING RAW MATERIALS OR BY EXTRACTION FROM WASTE MATERIALS, REFINING OR PRESERVING FATS, FATTY SUBSTANCES, e.g. LANOLIN, FATTY OILS OR WAXES; ESSENTIAL OILS; PERFUMES
    • C11B3/00—Refining fats or fatty oils
    • C11B3/008—Refining fats or fatty oils by filtration, e.g. including ultra filtration, dialysis

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Microbiology (AREA)
  • Food Science & Technology (AREA)
  • Polymers & Plastics (AREA)
  • Fats And Perfumes (AREA)
  • Edible Oils And Fats (AREA)

Abstract

The invention belongs to the technical field of cottonseed oil deep processing, and particularly discloses high-linoleic-acid cottonseed oil and a preparation method thereof, wherein unsaturated fatty acid in the cottonseed oil is more than 81%, linoleic acid is more than 60%, linoleic acid content in cottonseed oil stearin is more than 50%, unsaturated fatty acid content is more than 30%, and the cottonseed oil has a healthier effect than common edible oil and can inhibit cholesterol increase in blood.

Description

High linoleic acid cottonseed oil and preparation method thereof
Technical Field
The invention belongs to the technical field of fine and deep processing of cottonseed oil, and particularly relates to high-linoleic-acid cottonseed oil and a preparation method thereof.
Background
China is the biggest cotton producing country in the world, accounts for 40% of the global cotton yield, and has high cotton seed yield and high quality. The cottonseed oil is one of four traditional edible vegetable oils in China, is superior to corn oil, contains a large amount of fatty acids necessary for a human body, has good shortening, is known as natural shortening without trans-fatty acids, but is harmful to misunderstanding of the cottonseed oil, the cottonseed oil is not well utilized, the fatty acids necessary for the human body are necessary products for providing energy for organisms, are generally synthesized by the cottonseed oil or obtained by external real objects, the refined cottonseed oil contains a plurality of fatty acids necessary for the human body, particularly the content of linoleic acid in the refined cottonseed oil is high, the refined cottonseed oil can effectively inhibit the increase of cholesterol in blood and maintain the health of the human body, the conventional refined cottonseed oil is generally orange yellow or brown, the fatty acid composition contains 23.9% of palmitic acid, 2.09% of stearic acid, 14.87% of oleic acid, 55.24% of linoleic acid and the content of the rest fatty acids is lower than 1%, and the refined cotton clean oil eliminates toxic substances such as gossypol, the refined cottonseed oil can be eaten by people, but the conventional refined cottonseed oil contains certain high-melting-point fat, so that the refined cottonseed oil is not easy to absorb and utilize by the human body.
Disclosure of Invention
The invention aims to provide the cottonseed oil with high linoleic acid content, the content of linoleic acid in the cottonseed oil is up to 63 percent, the cottonseed oil has a healthier effect than common edible oil, and the increase of cholesterol in blood is inhibited.
In order to achieve the purpose, the invention adopts the technical scheme that:
the cottonseed oil with high linoleic acid content has unsaturated fatty acid content higher than 81%, linoleic acid content higher than 60%, linoleic acid content higher than 50% and unsaturated fatty acid content higher than 30%.
Further, the fatty acids in the cottonseed oil consist of: myristic acid (C14: 0) -0.38%, palmitic acid (C16: 0) -16.32%, palmitoleic acid (C16: 1) -0.23%, ginkgolic acid (C17: 1) -0.20%, stearic acid (C18: 0) -1.74%, oleic acid (C18: 1) -18.78%, linoleic acid (C18: 2) -61.40%, linolenic acid (C18: 3) -0.14%, arachidic acid (C20: 0) -0.19%, eicosenoic acid (C20: 1) -0.21%, behenic acid (C22: 0) -0.21%, tetracosanic acid (C24: 0) -0.13%.
Further, myristic acid (C14: 0) -0.38%, palmitic acid (C16: 0) -16.32%, palmitoleic acid (C16: 1) -0.23%, ginkgolic acid (C17: 1) -0.20%, stearic acid (C18: 0) -1.74%, oleic acid (C18: 1) -17.67%, linoleic acid (C18: 2) -62.51%, linolenic acid (C18: 3) -0.14%, arachidic acid (C20: 0) -0.19%, eicosenoic acid (C20: 1) -0.21%, behenic acid (C22: 0) -0.21%, tetracosanic acid (C24: 0) -0.13%.
Further, myristic acid (C14: 0) -0.38%, palmitic acid (C16: 0) -16.32%, palmitoleic acid (C16: 1) -0.23%, ginkgolic acid (C17: 1) -0.20%, stearic acid (C18: 0) -1.74%, oleic acid (C18: 1) -18.17%, linoleic acid (C18: 2) -63.01%, linolenic acid (C18: 3) -0.14%, arachidic acid (C20: 0) -0.19%, eicosenoic acid (C20: 1) -0.21%, behenic acid (C22: 0) -0.21%, tetracosanic acid (C24: 0) -0.13%.
A preparation method of high linoleic acid cottonseed oil comprises the following steps:
(1) cleaning and impurity removal: removing stone, dust, scrap iron and other substances mixed in the cottonseed, wherein the aperture of the screen mesh is 8 mm;
(2) shelling and crushing: the cottonseed after cleaning and impurity removal is sent to a husking machine to remove cottonseed hulls, cottonseed kernels are crushed into 4-6 sections by a crusher, then the cottonseed kernels are sent to a softening steaming and frying pan to soften the steamed and fried cottonseed kernels, the softening steaming and frying time is 30-40 min, and the steaming and frying temperature is 105-110 ℃;
(3) cold pressing at low temperature: conveying the steamed and fried cottonseed kernels into an oil press for squeezing, separating by an oil residue separation scraper, wherein the temperature of the oil press is not higher than 80 ℃, and conveying the cottonseed kernels after separation into a horizontal screw separator for further centrifugal separation to obtain squeezed crude oil;
(4) refining and fractionation of crude oil: conveying the squeezed crude oil to a refined oil device to remove colloid in the crude oil, reducing color in the oil through a decoloring process, deodorizing through a deodorization system, and then performing fractionation to obtain cottonseed oil, wherein the fractionation specifically comprises the steps of gradually cooling the oil by using a glycol water solution until the temperature reaches 5 ℃, filtering, and subjecting the filtered liquid oil to fractionation at 0 ℃ to obtain finished oil;
(5) deep purification: and (3) further deeply purifying the cottonseed oil obtained in the step (4) to obtain clear and transparent finished oil and cottonseed oil stearin at the temperature of below-10 ℃, wherein the deep purification is to uniformly cool the oil temperature from 20 ℃ to below-5 ℃ by using an ethylene glycol aqueous solution, and reduce the relatively high-melting-point long-carbon-chain saturated fatty acid in the oil.
Further, the pressure of the deodorization system in the step (4) is more than 240pa, and the temperature is more than 240 ℃.
Further, the ratio of the volume of the purification tank to the heat exchange area in the deep purification in the step (5) is more than 1:4, and the filtering temperature is-8 ℃.
The invention has the advantages that: according to the method, after refined cottonseed oil is deeply purified, the linoleic acid content is larger than or equal to 61%, any other auxiliary material is not added on the basis of common refined cottonseed oil, the linoleic acid content of the cottonseed oil is larger than or equal to 60%, the unsaturated fatty acid content is larger than or equal to 80%, the unsaturated fatty acid content is also increased by 8-10% on the original basis, the cottonseed oil stearin is more beneficial to absorption by a human body, the S2U content of the obtained cottonseed oil stearin is increased by 8-10% compared with that of the traditional cottonseed oil stearin, and the shortening property of the cottonseed oil is obviously improved; compared with the traditional cottonseed oil palmitic acid, the content of the palmitic acid is reduced by 14-18%, the content of saturated fatty acid is reduced, the absorption by a human body is facilitated, and the health is facilitated.
Drawings
FIG. 1 is a chromatogram of the composition of cottonseed oil fatty acids in the present invention.
Fig. 2 is a chromatogram of cottonseed oil stearin in of the present invention.
Detailed Description
Example 1
As shown in the figure, the fatty acid composition of the high linoleic cottonseed oil comprises the following components: myristic acid (C14: 0) -0.38%, palmitic acid (C16: 0) -16.32%, palmitoleic acid (C16: 1) -0.23%, ginkgolic acid (C17: 1) -0.20%, stearic acid (C18: 0) -1.74%, oleic acid (C18: 1) -18.78%, linoleic acid (C18: 2) -61.40%, linolenic acid (C18: 3) -0.14%, arachidic acid (C20: 0) -0.19%, eicosenoic acid (C20: 1) -0.21%, behenic acid (C22: 0) -0.21%, tetracosanic acid (C24: 0) -0.13%.
The cottonseed oil is prepared by the following method steps:
(1) cleaning and impurity removal: removing impurities except the cottonseed by a series of steps of metering, dedusting, screening, deironing and stoning, mainly removing stones, dust, scrap iron and other substances mixed in the cottonseed, wherein the aperture of a screen mesh is 8 mm;
(2) shelling and crushing: and (3) feeding the cleaned cotton seeds into a husking machine, removing the cotton seed husks through air transportation, crushing the remaining cotton seed kernels by a crusher to obtain 4-6 petals, feeding the crushed cotton seed kernels into a softening steaming and frying pan to soften the steamed and fried cotton seeds, wherein the softening steaming and frying time is 30-40 min, and the steaming and frying temperature is 105-110 ℃.
(3) Cold pressing at low temperature: conveying the raw materials to a low-temperature oil press for pressing, wherein the temperature of the oil press is less than or equal to 80 ℃, obtaining filter residues and crude oil, conveying the filter residues and the crude oil to a horizontal spiral separator after passing through an oil residue separation scraper plate, and obtaining pressed crude oil;
(4) refining and fractionation of crude oil: conveying the obtained crude oil to a refined oil device, removing colloid in the crude oil, decoloring and reducing color in the oil, removing peculiar smell in the oil by a deodorization system, carrying out fractionation on the refined oil to obtain clear and transparent cottonseed oil at 0 ℃ for 5.5h, wherein the fractionation specifically comprises the steps of cooling the oil by stages by using a glycol water solution until the temperature reaches 5 ℃, filtering, and obtaining the fractionated product oil at 0 ℃ from the filtered liquid oil;
(5) deep purification: the cottonseed oil is cooled to-5 ℃ in steps and filtered, deep purification is to use ethylene glycol aqueous solution to uniformly cool the oil temperature from 20 ℃ to below-5 ℃, deep purification is carried out to obtain a clear and transparent finished product and cottonseed oil stearin at the temperature of less than or equal to-7 ℃, deep purification is carried out to a purification tank, and the cottonseed oil must be prepared under the condition that the volume and the heat exchange area of the purification tank are more than or equal to 1: 4.
Example 2
A high linoleic cottonseed oil, the cottonseed oil having a fatty acid composition comprising the following components: myristic acid (C14: 0) -0.38%, palmitic acid (C16: 0) -16.32%, palmitoleic acid (C16: 1) -0.23%, ginkgolic acid (C17: 1) -0.20%, stearic acid (C18: 0) -1.74%, oleic acid (C18: 1) -17.67%, linoleic acid (C18: 2) -62.51%, linolenic acid (C18: 3) -0.14%, arachidic acid (C20: 0) -0.19%, eicosenoic acid (C20: 1) -0.21%, behenic acid (C22: 0) -0.21%, tetracosanic acid (C24: 0) -0.13%.
The cottonseed oil is prepared by the following method steps:
(1) cleaning and impurity removal: removing impurities except the cottonseed by a series of steps of metering, dedusting, screening, deironing and stoning, mainly removing stones, dust, scrap iron and other substances mixed in the cottonseed, wherein the aperture of a screen mesh is 8 mm;
(2) shelling and crushing: and (3) feeding the cleaned cotton seeds into a husking machine, removing the cotton seed husks through air transportation, crushing the remaining cotton seed kernels by a crusher to obtain 4-6 petals, feeding the crushed cotton seed kernels into a softening steaming and frying pan to soften the steamed and fried cotton seeds, wherein the softening steaming and frying time is 30-40 min, and the steaming and frying temperature is 105-110 ℃.
(3) Cold pressing at low temperature: conveying the raw materials to a low-temperature oil press for pressing, wherein the temperature of the oil press is less than or equal to 80 ℃, obtaining filter residues and crude oil, conveying the filter residues and the crude oil to a horizontal spiral separator after passing through an oil residue separation scraper plate, and obtaining pressed crude oil;
(4) refining and fractionation of crude oil: conveying the obtained crude oil to a refined oil device, removing colloid in the crude oil, decoloring and reducing color in the oil, removing peculiar smell in the oil by a deodorization system, carrying out fractionation on the refined oil to obtain clear and transparent cottonseed oil at 0 ℃ for 5.5h, wherein the fractionation specifically comprises the steps of cooling the oil by stages by using a glycol water solution until the temperature reaches 5 ℃, filtering, and obtaining the fractionated product oil at 0 ℃ from the filtered liquid oil;
(5) deep purification: the cottonseed oil is cooled to minus 7 ℃ in steps and filtered, wherein in the deep purification, the oil temperature is uniformly cooled to below minus 5 ℃ from 20 ℃ by using an ethylene glycol aqueous solution, a clear and transparent finished product and the cottonseed oil stearin are obtained by deep purification at the temperature of less than or equal to minus 9 ℃, and the cottonseed oil stearin is used for a purification tank and must be prepared under the condition that the volume and the heat exchange area of the purification tank are more than or equal to 1: 4.
Example 3
A high linoleic cottonseed oil, the cottonseed oil having a fatty acid composition comprising the following components: myristic acid (C14: 0) -0.38%, palmitic acid (C16: 0) -16.32%, palmitoleic acid (C16: 1) -0.23%, ginkgolic acid (C17: 1) -0.20%, stearic acid (C18: 0) -1.74%, oleic acid (C18: 1) -18.17%, linoleic acid (C18: 2) -63.01%, linolenic acid (C18: 3) -0.14%, arachidic acid (C20: 0) -0.19%, eicosenoic acid (C20: 1) -0.21%, behenic acid (C22: 0) -0.21%, tetracosanic acid (C24: 0) -0.13%.
The cottonseed oil is prepared by the following method steps:
(1) cleaning and impurity removal: removing impurities except the cottonseed by a series of steps of metering, dedusting, screening, deironing and stoning, mainly removing stones, dust, scrap iron and other substances mixed in the cottonseed, wherein the aperture of a screen mesh is 8 mm;
(2) shelling and crushing: and (3) feeding the cleaned cotton seeds into a husking machine, removing the cotton seed husks through air transportation, crushing the remaining cotton seed kernels by a crusher to obtain 4-6 petals, feeding the crushed cotton seed kernels into a softening steaming and frying pan to soften the steamed and fried cotton seeds, wherein the softening steaming and frying time is 30-40 min, and the steaming and frying temperature is 105-110 ℃.
(3) Cold pressing at low temperature: conveying the raw materials to a low-temperature oil press for pressing, wherein the temperature of the oil press is less than or equal to 80 ℃, obtaining filter residues and crude oil, conveying the filter residues and the crude oil to a horizontal spiral separator after passing through an oil residue separation scraper plate, and obtaining pressed crude oil;
(4) refining and fractionation of crude oil: conveying the obtained crude oil to a refined oil device, removing colloid in the crude oil, decoloring and reducing color in the oil, removing peculiar smell in the oil by a deodorization system, carrying out fractionation on the refined oil to obtain cottonseed oil which is still clear and transparent after standing for 5.5h at 0 ℃, wherein the deodorization system needs to remove smell at high temperature and high vacuum, the pressure is more than 240pa, the temperature is less than 240 ℃, the fractionation is specifically that the oil is cooled step by step to 5 ℃ by using a glycol aqueous solution and then filtered, and the liquid oil after filtration is 0 ℃ fractionated to obtain the finished oil;
(5) deep purification: the cottonseed oil is cooled to minus 9 ℃ in steps and filtered, wherein in the deep purification, the oil temperature is uniformly cooled to below minus 5 ℃ from 20 ℃ by using an ethylene glycol aqueous solution, a clear and transparent finished product and the cottonseed oil stearin are obtained by deep purification at the temperature of less than or equal to minus 11 ℃, and the cottonseed oil stearin is used for a purification tank and must be prepared under the condition that the volume and the heat exchange area of the purification tank are more than or equal to 1: 4.

Claims (7)

1. High linoleic acid cottonseed oil, characterized in that: the content of unsaturated fatty acid in the cottonseed oil is more than 81%, the content of linoleic acid in the cottonseed oil stearin is more than 50%, and the content of unsaturated fatty acid in the cottonseed oil stearin is more than 30%.
2. The high linoleic cottonseed oil according to claim 1 wherein: the fatty acid in the cottonseed oil consists of the following substances: myristic acid (C14: 0) -0.38%, palmitic acid (C16: 0) -16.32%, palmitoleic acid (C16: 1) -0.23%, ginkgolic acid (C17: 1) -0.20%, stearic acid (C18: 0) -1.74%, oleic acid (C18: 1) -18.78%, linoleic acid (C18: 2) -61.40%, linolenic acid (C18: 3) -0.14%, arachidic acid (C20: 0) -0.19%, eicosenoic acid (C20: 1) -0.21%, behenic acid (C22: 0) -0.21%, tetracosanic acid (C24: 0) -0.13%.
3. The high linoleic cottonseed oil according to claim 1 wherein: the fatty acid in the cottonseed oil consists of the following substances: myristic acid (C14: 0) -0.38%, palmitic acid (C16: 0) -16.32%, palmitoleic acid (C16: 1) -0.23%, ginkgolic acid (C17: 1) -0.20%, stearic acid (C18: 0) -1.74%, oleic acid (C18: 1) -17.67%, linoleic acid (C18: 2) -62.51%, linolenic acid (C18: 3) -0.14%, arachidic acid (C20: 0) -0.19%, eicosenoic acid (C20: 1) -0.21%, behenic acid (C22: 0) -0.21%, tetracosanic acid (C24: 0) -0.13%.
4. The high linoleic cottonseed oil according to claim 1 wherein: the fatty acid in the cottonseed oil consists of the following substances: myristic acid (C14: 0) -0.38%, palmitic acid (C16: 0) -16.32%, palmitoleic acid (C16: 1) -0.23%, ginkgolic acid (C17: 1) -0.20%, stearic acid (C18: 0) -1.74%, oleic acid (C18: 1) -18.17%, linoleic acid (C18: 2) -63.01%, linolenic acid (C18: 3) -0.14%, arachidic acid (C20: 0) -0.19%, eicosenoic acid (C20: 1) -0.21%, behenic acid (C22: 0) -0.21%, tetracosanic acid (C24: 0) -0.13%.
5. The method of preparing high linoleic cottonseed oil according to any one of claims 1 to 4 comprising the steps of:
(1) cleaning and impurity removal: removing stone, dust, scrap iron and other substances mixed in the cottonseed, wherein the aperture of the screen mesh is 8 mm;
(2) shelling and crushing: the cottonseed after cleaning and impurity removal is sent to a husking machine to remove cottonseed hulls, cottonseed kernels are crushed into 4-6 sections by a crusher, then the cottonseed kernels are sent to a softening steaming and frying pan to soften the steamed and fried cottonseed kernels, the softening steaming and frying time is 30-40 min, and the steaming and frying temperature is 105-110 ℃;
(3) cold pressing at low temperature: conveying the steamed and fried cottonseed kernels into an oil press for squeezing, separating by an oil residue separation scraper, wherein the temperature of the oil press is not higher than 80 ℃, and conveying the cottonseed kernels after separation into a horizontal screw separator for further centrifugal separation to obtain squeezed crude oil;
(4) refining and fractionation of crude oil: conveying the squeezed crude oil to a refined oil device to remove colloid in the crude oil, reducing color in the oil through a decoloring process, deodorizing through a deodorization system, and then performing fractionation to obtain cottonseed oil, wherein the fractionation specifically comprises the steps of gradually cooling the oil by using a glycol water solution until the temperature reaches 5 ℃, filtering, and subjecting the filtered liquid oil to fractionation at 0 ℃ to obtain finished oil;
(5) deep purification: and (3) further deeply purifying the cottonseed oil obtained in the step (4) to obtain clear and transparent finished oil and cottonseed oil stearin at the temperature of below-10 ℃, wherein the deep purification is to uniformly cool the oil temperature from 20 ℃ to below-5 ℃ by using an ethylene glycol aqueous solution.
6. The method of preparing high linoleic cottonseed oil according to claim 5 wherein: the pressure of the deodorization system in the step (4) is more than 240pa, and the temperature is more than 240 ℃.
7. The method of preparing high linoleic cottonseed oil according to claim 5 wherein: in the step (5), the ratio of the volume of the purification tank to the heat exchange area in the deep purification is more than 1:4, and the filtering temperature is-8 ℃.
CN202110264095.8A 2021-03-11 2021-03-11 High linoleic acid cottonseed oil and preparation method thereof Pending CN112868818A (en)

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Application publication date: 20210601