CN112920889A - Method for extracting linseed oil containing unsaturated fatty acid - Google Patents
Method for extracting linseed oil containing unsaturated fatty acid Download PDFInfo
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- CN112920889A CN112920889A CN202110190383.3A CN202110190383A CN112920889A CN 112920889 A CN112920889 A CN 112920889A CN 202110190383 A CN202110190383 A CN 202110190383A CN 112920889 A CN112920889 A CN 112920889A
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- 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
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- 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
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- 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
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- 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
- C11B3/10—Refining fats or fatty oils by adsorption
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- Chemical Kinetics & Catalysis (AREA)
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Abstract
The invention relates to the technical field of linseed oil extraction, in particular to a method for extracting linseed oil containing unsaturated fatty acid, which comprises the following steps: s1, preparing a linseed raw material; s2, cleaning the flaxseeds; s3, screening flax seeds; s4, squeezing the flaxseeds at low temperature; s5, hydrating and degumming, and vacuum debitterizing; s6, winterization: intermittent winterization and continuous winterization crystallization crystal growing; s7, filtering and storing, wherein the linolenic acid content of cold-pressed linseed oil is 3% -4% higher than that of hot-pressed linseed oil, part of linolenic acid is damaged at high temperature, alpha-linolenic acid content is more than or equal to 45% and lower than that of the cold-pressed linseed oil after the linseed oil is refined, linseed water content is controlled within 8%, and the linseed oil acid value (KOH) is controlled to be less than or equal to 0.6mg/g through cold pressing, adsorption hydration, winterization and packaging, so that degreasing is needed in the winterization process, no precipitate is generated, and the extraction efficiency of the linseed oil is improved.
Description
Technical Field
The invention relates to the technical field of linseed oil extraction, and particularly relates to a method for extracting linseed oil containing unsaturated fatty acid.
Background
The linseed oil is prepared from flaxseed, which is the seed of flax, belongs to the flaxseed family, is called flax in other words, because the flaxseed is native to east India areas, the flaxseed belongs to traditional oil crops in China, the flaxseed is divided into oil flax, oil-fiber flax and fiber flax, and the oil flax seed is mainly produced in China from Changbai mountain Song plain and black dragon river zone, inner Mongolia, Ningxia Liupan mountain area and Zhangjiakou dam to Zhang north; the distribution of inner Mongolia grassland is the most, and the flax is planted in a small amount in the northeast, and the flax has barren resistance, but as the flax for oil, three conditions of 'cold climate, rich soil and sufficient illumination' are indispensable.
At present, the extraction time is longer in a mode with high oil yield, the oil yield is low in a mode with high extraction speed, and meanwhile, the existing extraction mode easily causes deformation of nutrient components in the linseed oil, so that a lot of nutrient components are lost, and therefore, the linseed oil extraction method containing unsaturated fatty acid is provided.
Disclosure of Invention
The present invention aims to provide a method for extracting linseed oil containing unsaturated fatty acids, so as to solve the problems in the background art.
In order to achieve the purpose, the invention provides the following technical scheme:
a method for extracting linseed oil containing unsaturated fatty acid comprises the following steps:
s1, preparing a linseed raw material;
s2, cleaning the flaxseeds;
s3, screening flax seeds;
s4, squeezing the flaxseeds at low temperature;
s5, hydrating and degumming, and vacuum debitterizing;
s6, winterization: intermittent winterization and continuous winterization crystallization crystal growing;
and S7, filtering and storing.
Preferably, the S1 flaxseed feedstock is prepared by: selecting semen Lini with proper maturity, full grain and good quality, water content less than 9%, oil content greater than or equal to 32%, impurity less than or equal to 2%, acid value (KOH) less than or equal to 1.0mg/g, and peroxide value less than or equal to 5 mmol/kg.
Preferably, the S2 flaxseed conditioning: the method comprises the steps of selecting a stone-removing combined sieve, wherein the aperture of a large impurity-removing sieve plate is 1.2mm multiplied by 20mm, the shape of the sieve plate hole is square, the number of the sieve holes per inch is 20-24, the aperture of a small impurity-removing sieve plate is circular, the aperture is 1.8-2.2 mm, and the shape of the sieve hole is square, and the number of the sieve holes per inch is 14.
Preferably, the S3 flaxseed screen: magnetic separation equipment is selected to remove metal impurities in flaxseeds.
Preferably, the S4 linseed is pressed at low temperature: cold pressing is carried out at room temperature, the temperature is less than or equal to 40 ℃, a YZYX20-2 double-screw oil press is selected, the cake residual oil is controlled by adjusting the thickness of the cake after pressing when the pressed water is less than or equal to 8 percent, and the cake thickness is about 4mm and the dry cake residual oil is controlled at 7 to 8 percent for the single-screw oil press; and (3) adjusting the thickness of the cake to be 5-6 mm and the residual oil of the cake to be 10% -12% for the twin-screw oil press. The oil temperature is less than or equal to 55 ℃.
Preferably, the S5 is degummed by hydration: the pressed oil directly enters a degumming reaction tank (batch type), is not heated, is added with 5kg/t of diatomite at room temperature, is stirred for about 30min at 60r/min (variable frequency), and enters a box type filter to produce the degummed oil.
Preferably, said S5 vacuum debittering: adding activated carbon with the mass of 0.1-0.5% of that of the oil at the oil temperature of 60-65 ℃ and the vacuum degree of 90-100 kPa, reacting for 20-40 min at the speed of 60-80 r/min, and filtering at normal temperature after reaction.
Preferably, the S6 batch winterization: the method comprises the steps of adopting 1 crystallizing tank and 2 crystal growing tanks, selecting a screw pump as a crystallizing pump, using a box type filter, directly feeding degummed filter oil into the crystallizing tank, stirring at 35r/min (variable frequency) and at a crystallization temperature of-6 ℃ for 24 hours, and feeding the degummed filter oil into the crystal growing tanks by the screw pump at a stirring speed of 35r/min (variable frequency) and at a crystal growing temperature of 2 ℃ for 24 hours.
Preferably, the S6 continuous winterization crystallization crystal growing: the oil temperature is reduced to 15 ℃ through a heat exchanger and a cooler, 5kg/t of crystallizing agent is added, 2 crystallizing tanks are used, the oil temperature in a 1# crystallizing tank is 15 ℃, the oil temperature in a 2# crystallizing tank is 10 ℃, the oil temperature in a crystal growing tank is 5 ℃, the stirring speed of the crystallizing tank is 22r/min (frequency conversion is 60-70%), crystallization is 12h, 2 crystal growing tanks are used, the stirring speed is 22r/min (frequency conversion is 50-60%), crystal growing is 18h, and the temperature is increased to 10-12 ℃ after crystal growing and then the crystal is fed into a filter.
Preferably, the S7 filter contains: two filters are used alternately, one filter and one wax cake discharge are cleaned for standby, pre-coating is carried out on a leaf filter, mixed oil consisting of 3-4 kg/t of diatomite and clean oil (dewaxing oil) is pre-coated, the mixed oil is circulated to the leaves of the leaf filter by a pump for about 6min, the thickness of a pre-coating layer is 0.32-0.64 mm, the normal filtering pressure is 0.20-0.37 MPa, the temperature of the filtering oil is 10-12 ℃, and after the filtering pressure is more than 0.37MPa, the filter is changed to another filter for filtration, compressed air is used for blowing, most of oil is discharged into a finished oil tank, a small amount of oil (turbid) with filter aid is discharged into a filter aid tank, filter cakes are dried by compressed air, the residual oil blown out in the cake blowing process is discharged into a pre-coating filter aid/oil mixing tank and a dirty oil tank, blowing and filtering the oil, then blowing the oil for 20-40 min by using 0.3MPa saturated steam, and opening a filter to discharge a filter cake.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the linolenic acid content of cold-pressed linseed oil is 3% -4% higher than that of hot-pressed linseed oil, part of linolenic acid is destroyed at high temperature, alpha-linolenic acid content is more than or equal to 45% after linseed oil is refined and is lower than that of the cold-pressed linseed oil, linseed water content is controlled within 8%, the acid value (KOH) of the linseed oil is controlled to be less than or equal to 0.6mg/g through cold pressing, adsorption hydration, winterization and packaging, degreasing is required in the winterization process, no precipitate is generated, and the extraction efficiency of the linseed oil is improved.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without any creative work based on the embodiments of the present invention belong to the protection scope of the present invention.
The invention provides a technical scheme that:
a method for extracting linseed oil containing unsaturated fatty acid comprises the following steps:
s1, preparing a linseed raw material;
s2, cleaning the flaxseeds;
s3, screening flax seeds;
s4, squeezing the flaxseeds at low temperature;
s5, hydrating and degumming, and vacuum debitterizing;
s6, winterization: intermittent winterization and continuous winterization crystallization crystal growing;
and S7, filtering and storing.
The S1 flaxseed feedstock preparation: selecting semen Lini with proper maturity, full grain and good quality, water content less than 9%, oil content greater than or equal to 32%, impurity less than or equal to 2%, acid value (KOH) less than or equal to 1.0mg/g, and peroxide value less than or equal to 5 mmol/kg.
The S2 flaxseed cleaning: the method comprises the steps of selecting a stone-removing combined sieve, wherein the aperture of a large impurity-removing sieve plate is 1.2mm multiplied by 20mm, the shape of the sieve plate hole is square, the number of the sieve holes per inch is 20-24, the aperture of a small impurity-removing sieve plate is circular, the aperture is 1.8-2.2 mm, and the shape of the sieve hole is square, and the number of the sieve holes per inch is 14.
The S3 flaxseed screening: magnetic separation equipment is selected to remove metal impurities in flaxseeds.
The S4 linseed is pressed at low temperature: cold pressing is carried out at room temperature, the temperature is less than or equal to 40 ℃, a YZYX20-2 double-screw oil press is selected, the cake residual oil is controlled by adjusting the thickness of the cake after pressing when the pressed water is less than or equal to 8 percent, and the cake thickness is about 4mm and the dry cake residual oil is controlled at 7 to 8 percent for the single-screw oil press; and (3) adjusting the thickness of the cake to be 5-6 mm and the residual oil of the cake to be 10% -12% for the twin-screw oil press. The oil temperature is less than or equal to 55 ℃.
And (3) hydration degumming of the S5: the pressed oil directly enters a degumming reaction tank (batch type), is not heated, is added with 5kg/t of diatomite at room temperature, is stirred for about 30min at 60r/min (variable frequency), and enters a box type filter to produce the degummed oil.
The S5 vacuum debittering: adding activated carbon with the mass of 0.1-0.5% of that of the oil at the oil temperature of 60-65 ℃ and the vacuum degree of 90-100 kPa, reacting for 20-40 min at the speed of 60-80 r/min, and filtering at normal temperature after reaction.
The S6 intermittent winterization: the method comprises the steps of adopting 1 crystallizing tank and 2 crystal growing tanks, selecting a screw pump as a crystallizing pump, using a box type filter, directly feeding degummed filter oil into the crystallizing tank, stirring at 35r/min (variable frequency) and at a crystallization temperature of-6 ℃ for 24 hours, and feeding the degummed filter oil into the crystal growing tanks by the screw pump at a stirring speed of 35r/min (variable frequency) and at a crystal growing temperature of 2 ℃ for 24 hours.
And the S6 continuous winterization crystallization crystal growing: the oil temperature is reduced to 15 ℃ through a heat exchanger and a cooler, 5kg/t of crystallizing agent is added, 2 crystallizing tanks are used, the oil temperature in a 1# crystallizing tank is 15 ℃, the oil temperature in a 2# crystallizing tank is 10 ℃, the oil temperature in a crystal growing tank is 5 ℃, the stirring speed of the crystallizing tank is 22r/min (frequency conversion is 60-70%), crystallization is 12h, 2 crystal growing tanks are used, the stirring speed is 22r/min (frequency conversion is 50-60%), crystal growing is 18h, and the temperature is increased to 10-12 ℃ after crystal growing and then the crystal is fed into a filter.
The S7 filtration storage: two filters are used alternately, one filter and one wax cake discharge are cleaned for standby, pre-coating is carried out on a leaf filter, mixed oil consisting of 3-4 kg/t of diatomite and clean oil (dewaxing oil) is pre-coated, the mixed oil is circulated to the leaves of the leaf filter by a pump for about 6min, the thickness of a pre-coating layer is 0.32-0.64 mm, the normal filtering pressure is 0.20-0.37 MPa, the temperature of the filtering oil is 10-12 ℃, and after the filtering pressure is more than 0.37MPa, the filter is changed to another filter for filtration, compressed air is used for blowing, most of oil is discharged into a finished oil tank, a small amount of oil (turbid) with filter aid is discharged into a filter aid tank, filter cakes are dried by compressed air, the residual oil blown out in the cake blowing process is discharged into a pre-coating filter aid/oil mixing tank and a dirty oil tank, blowing and filtering the oil, then blowing the oil for 20-40 min by using 0.3MPa saturated steam, and opening a filter to discharge a filter cake.
Example (b): preparing a flaxseed raw material: selecting flax seeds with proper maturity, full grains and good quality, wherein the water content is lower than 9%, the oil content is greater than or equal to 32%, the impurity content is less than or equal to 2%, the acid value (KOH) is less than or equal to 1.0mg/g, and the peroxide value is less than or equal to 5 mmol/kg; cleaning flaxseeds: selecting a stone-removing combined sieve, wherein the aperture of a large impurity-removing sieve plate is 1.2mm multiplied by 20mm, the shape of the sieve mesh is square, the number of holes per inch is 20-24, the aperture of a small impurity-removing sieve plate is circular, the aperture is 1.8-2.2 mm, and the shape of the sieve mesh is square, and the number of the sieve mesh is 14 per inch; screening flaxseeds: removing metal impurities in the flaxseeds by using magnetic separation equipment; low-temperature pressing of flaxseeds: cold pressing is carried out at room temperature, the temperature is less than or equal to 40 ℃, a YZYX20-2 double-screw oil press is selected, the cake residual oil is controlled by adjusting the thickness of the cake after pressing when the pressed water is less than or equal to 8 percent, and the cake thickness is about 4mm and the dry cake residual oil is controlled at 7 to 8 percent for the single-screw oil press; and (3) adjusting the thickness of the cake to be 5-6 mm and the residual oil of the cake to be 10% -12% for the twin-screw oil press. The oil temperature is less than or equal to 55 ℃; hydration degumming: directly feeding the squeezed oil into a degumming reaction tank (batch type), adding 5kg/t of diatomite at room temperature without heating, stirring at 60r/min (variable frequency) for about 30min, and feeding into a box type filter to produce degummed oil; vacuum debitterizing: adding activated carbon with the mass of 0.1-0.5% of that of the oil at the oil temperature of 60-65 ℃ and the vacuum degree of 90-100 kPa, reacting for 20-40 min at the speed of 60-80 r/min, and filtering at normal temperature after reaction; intermittent winterization: 1 crystallizing tank and 2 crystal growing tanks are adopted, a screw pump is selected as a crystallizing pump, a box type filter is adopted, degummed filter oil directly enters the crystallizing tank, the stirring speed is 35r/min (variable frequency), the crystallizing temperature is-6 ℃, the crystallizing time is 24 hours, the degummed filter oil enters the crystal growing tanks through the screw pump, the stirring speed is 35r/min (variable frequency), the crystal growing temperature is 2 ℃, and the crystal growing time is 24 hours; continuous winterization crystallization and crystal growth: cooling the oil to 15 ℃ through a heat exchanger and a cooler, adding 5kg/t of crystallizing agent, adding 2 crystallizing tanks, feeding the oil into a 1# crystallizing tank for 15 ℃, feeding the oil into a 2# crystallizing tank for 10 ℃, feeding the oil into a crystal growing tank for 5 ℃, stirring the oil in the crystallizing tank at a speed of 22r/min (frequency conversion of 60-70%), crystallizing for 12h, feeding the oil into 2# crystallizing tanks at a speed of 22r/min (frequency conversion of 50-60%), growing the crystal for 18h, and heating to 10-12 ℃ after crystal growing, and feeding the crystal into a filter; filtering and accommodating: two filters are used alternately, one filter and one wax cake discharge are cleaned for standby, pre-coating is carried out on a leaf filter, mixed oil consisting of 3-4 kg/t of diatomite and clean oil (dewaxed oil) is used for pre-coating, the mixed oil is circulated onto the leaves of the leaf filter by a pump for about 6min, the thickness of a pre-coating layer is 0.32-0.64 mm, the normal filtering pressure is 0.20-0.37 MPa, the temperature of filtered oil is 10-12 ℃, when the filtering pressure is more than 0.37MPa, the other filter is switched for filtering, compressed air is used for blowing, most of oil is discharged into a finished oil tank, a small amount of oil (turbid) with filter aids is discharged into a tank, filter cakes are dried by compressed air, residual oil blown out in the process of blowing the filter cakes is discharged into a pre-coating filter aid/oil mixing tank and a dirty oil tank, saturated steam of 0.3MPa is used for blowing for 20-40 min after drying and filtering, the filter cakes are discharged, the linolenic acid content of cold-pressed linseed oil is 3% -4% higher than that of hot-pressed linseed oil, part of linolenic acid is destroyed at high temperature, alpha-linolenic acid content is more than or equal to 45% after the linseed oil is refined and is lower than that of the cold-pressed linseed oil, linseed water content is controlled within 8%, and the acid value (KOH) of the linseed oil is controlled to be less than or equal to 0.6mg/g through cold pressing, adsorption hydration, winterization and packaging, so that degreasing is needed in the winterization process, precipitates are not generated, and the extraction efficiency of the linseed oil is improved.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
1. A method for extracting linseed oil containing unsaturated fatty acid is characterized by comprising the following steps:
s1, preparing a linseed raw material;
s2, cleaning the flaxseeds;
s3, screening flax seeds;
s4, squeezing the flaxseeds at low temperature;
s5, hydrating and degumming, and vacuum debitterizing;
s6, winterization: intermittent winterization and continuous winterization crystallization crystal growing;
and S7, filtering and storing.
2. The method of claim 1, wherein the S1 flaxseed material is prepared by: selecting semen Lini with proper maturity, full grain and good quality, water content less than 9%, oil content greater than or equal to 32%, impurity less than or equal to 2%, acid value (KOH) less than or equal to 1.0mg/g, and peroxide value less than or equal to 5 mmol/kg.
3. The method of claim 1, wherein the S2 cleaning of flaxseed comprises: the method comprises the steps of selecting a stone-removing combined sieve, wherein the aperture of a large impurity-removing sieve plate is 1.2mm multiplied by 20mm, the shape of the sieve plate hole is square, the number of the sieve holes per inch is 20-24, the aperture of a small impurity-removing sieve plate is circular, the aperture is 1.8-2.2 mm, and the shape of the sieve hole is square, and the number of the sieve holes per inch is 14.
4. The method of claim 1, wherein the S3 screening of linseed oil comprises: magnetic separation equipment is selected to remove metal impurities in flaxseeds.
5. The method of claim 1, wherein the S4 linseed oil is low-temperature pressed according to claim 1, wherein the weight ratio of the S4 linseed oil is as follows: cold pressing is carried out at room temperature, the temperature is less than or equal to 40 ℃, a YZYX20-2 double-screw oil press is selected, the cake residual oil is controlled by adjusting the thickness of the cake after pressing when the pressed water is less than or equal to 8 percent, and the cake thickness is about 4mm and the dry cake residual oil is controlled at 7 to 8 percent for the single-screw oil press; and (3) adjusting the thickness of the cake to be 5-6 mm and the residual oil of the cake to be 10% -12% for the twin-screw oil press. The oil temperature is less than or equal to 55 ℃.
6. The method of claim 1, wherein the S5 is degummed by hydration: the pressed oil directly enters a degumming reaction tank (batch type), is not heated, is added with 5kg/t of diatomite at room temperature, is stirred for about 30min at 60r/min (variable frequency), and enters a box type filter to produce the degummed oil.
7. The method of claim 1, wherein the S5 vacuum debitterizing comprises: adding activated carbon with the mass of 0.1-0.5% of that of the oil at the oil temperature of 60-65 ℃ and the vacuum degree of 90-100 kPa, reacting for 20-40 min at the speed of 60-80 r/min, and filtering at normal temperature after reaction.
8. The method of claim 1, wherein the S6 batch winterization: the method comprises the steps of adopting 1 crystallizing tank and 2 crystal growing tanks, selecting a screw pump as a crystallizing pump, using a box type filter, directly feeding degummed filter oil into the crystallizing tank, stirring at 35r/min (variable frequency) and at a crystallization temperature of-6 ℃ for 24 hours, and feeding the degummed filter oil into the crystal growing tanks by the screw pump at a stirring speed of 35r/min (variable frequency) and at a crystal growing temperature of 2 ℃ for 24 hours.
9. The method of claim 1, wherein the S6 continuous winterization crystallization seeding: the oil temperature is reduced to 15 ℃ through a heat exchanger and a cooler, 5kg/t of crystallizing agent is added, 2 crystallizing tanks are used, the oil temperature in a 1# crystallizing tank is 15 ℃, the oil temperature in a 2# crystallizing tank is 10 ℃, the oil temperature in a crystal growing tank is 5 ℃, the stirring speed of the crystallizing tank is 22r/min (frequency conversion is 60-70%), crystallization is 12h, 2 crystal growing tanks are used, the stirring speed is 22r/min (frequency conversion is 50-60%), crystal growing is 18h, and the temperature is increased to 10-12 ℃ after crystal growing and then the crystal is fed into a filter.
10. The method of claim 1, wherein the S7 filtration contains: two filters are used alternately, one filter and one wax cake discharge are cleaned for standby, pre-coating is carried out on a leaf filter, mixed oil consisting of 3-4 kg/t of diatomite and clean oil (dewaxing oil) is pre-coated, the mixed oil is circulated to the leaves of the leaf filter by a pump for about 6min, the thickness of a pre-coating layer is 0.32-0.64 mm, the normal filtering pressure is 0.20-0.37 MPa, the temperature of the filtering oil is 10-12 ℃, and after the filtering pressure is more than 0.37MPa, the filter is changed to another filter for filtration, compressed air is used for blowing, most of oil is discharged into a finished oil tank, a small amount of oil (turbid) with filter aid is discharged into a filter aid tank, filter cakes are dried by compressed air, the residual oil blown out in the cake blowing process is discharged into a pre-coating filter aid/oil mixing tank and a dirty oil tank, blowing and filtering the oil, then blowing the oil for 20-40 min by using 0.3MPa saturated steam, and opening a filter to discharge a filter cake.
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| CN202110190383.3A CN112920889A (en) | 2021-02-18 | 2021-02-18 | Method for extracting linseed oil containing unsaturated fatty acid |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114032138A (en) * | 2021-10-25 | 2022-02-11 | 西北农林科技大学 | Preparation method of germinated flaxseed and edible oil |
| CN116103080A (en) * | 2021-11-10 | 2023-05-12 | 李石平 | Linseed oil not easy to generate bitter taste and preparation method thereof |
-
2021
- 2021-02-18 CN CN202110190383.3A patent/CN112920889A/en active Pending
Non-Patent Citations (1)
| Title |
|---|
| 左青，等: "亚麻籽油及其关键生产技术", 中国油脂, vol. 42, no. 8, pages 157 - 196 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114032138A (en) * | 2021-10-25 | 2022-02-11 | 西北农林科技大学 | Preparation method of germinated flaxseed and edible oil |
| CN114032138B (en) * | 2021-10-25 | 2023-10-31 | 西北农林科技大学 | Preparation method of germinated flaxseeds and edible oil |
| CN116103080A (en) * | 2021-11-10 | 2023-05-12 | 李石平 | Linseed oil not easy to generate bitter taste and preparation method thereof |
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