CN113831961A - Walnut oil extraction method - Google Patents
Walnut oil extraction method Download PDFInfo
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- CN113831961A CN113831961A CN202111106360.6A CN202111106360A CN113831961A CN 113831961 A CN113831961 A CN 113831961A CN 202111106360 A CN202111106360 A CN 202111106360A CN 113831961 A CN113831961 A CN 113831961A
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- walnut
- pressure
- pieces
- oil
- kernels
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- 235000019498 Walnut oil Nutrition 0.000 title claims abstract description 36
- 239000008170 walnut oil Substances 0.000 title claims abstract description 36
- 238000000605 extraction Methods 0.000 title claims abstract description 33
- 235000020234 walnut Nutrition 0.000 claims abstract description 63
- 241000758789 Juglans Species 0.000 claims abstract description 61
- 235000009496 Juglans regia Nutrition 0.000 claims abstract description 61
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 28
- 238000000034 method Methods 0.000 claims abstract description 28
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 14
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 14
- 238000007670 refining Methods 0.000 claims abstract description 8
- 239000002245 particle Substances 0.000 claims description 10
- 239000004677 Nylon Substances 0.000 claims description 8
- 239000004698 Polyethylene Substances 0.000 claims description 8
- 239000010779 crude oil Substances 0.000 claims description 8
- 229920001778 nylon Polymers 0.000 claims description 8
- -1 polyethylene Polymers 0.000 claims description 8
- 229920000573 polyethylene Polymers 0.000 claims description 8
- 238000003825 pressing Methods 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 5
- 239000003921 oil Substances 0.000 description 10
- 235000019198 oils Nutrition 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 4
- 239000004519 grease Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 241000238631 Hexapoda Species 0.000 description 2
- 241000758791 Juglandaceae Species 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 235000013399 edible fruits Nutrition 0.000 description 2
- 239000000706 filtrate Substances 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 238000009874 alkali refining Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 235000015112 vegetable and seed oil Nutrition 0.000 description 1
- 239000008158 vegetable oil Substances 0.000 description 1
Classifications
-
- 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
-
- 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
-
- 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
- C11B3/02—Refining fats or fatty oils by chemical reaction
- C11B3/06—Refining fats or fatty oils by chemical reaction with bases
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Microbiology (AREA)
- Fats And Perfumes (AREA)
- Seeds, Soups, And Other Foods (AREA)
Abstract
The invention provides a walnut oil extraction method, which comprises the following steps: breaking the skin of the walnut, and collecting the walnut kernels; crushing the walnut kernels to obtain crushed walnut kernels; placing the walnut pieces in a closed container, filling carbon dioxide into the closed container, and performing pressurization treatment to obtain a pressurized product; and (4) releasing the pressure, and squeezing and refining the pressurized product to obtain the walnut oil. The extraction rate of the walnut oil extraction method is up to more than 75%, the time is short, the cost is low, and the method is suitable for industrial application.
Description
Technical Field
The invention relates to the field of food. In particular, the invention relates to a walnut oil extraction method.
Background
The walnut oil is vegetable oil which is prepared by squeezing walnut kernels serving as a raw material. The grease content of the walnut reaches 65-70 percent, and the walnut oil belongs to all woody oil and is reputed as oil depots on trees. How to improve the extraction rate of the walnut oil and reduce the production cost is the core technical bottleneck of research of researchers, and overcoming the problems is beneficial to better popularization and application of the walnut oil.
Disclosure of Invention
The present invention aims to solve at least one of the problems of the prior art to at least some extent. Therefore, the invention provides the walnut oil extraction method, the extraction rate of the walnut oil is up to more than 75%, the time consumption is short, the cost is low, and the method is suitable for industrial application.
The invention provides a walnut oil extraction method. According to an embodiment of the invention, the method comprises: breaking the skin of the walnut, and collecting the walnut kernels; crushing the walnut kernels to obtain crushed walnut kernels; placing the walnut pieces in a closed container, filling carbon dioxide into the closed container, and carrying out pressurization and pressure relief treatment; and squeezing and refining the product obtained in the previous step to obtain the walnut oil.
According to the extraction method provided by the embodiment of the invention, the compressed gas obtained by compressing carbon dioxide permeates into walnut kernel cells, the cells can be broken along with the pressure relief operation, oil can be better squeezed out in the subsequent squeezing treatment process, the extraction efficiency is improved, the integral walnut oil extraction rate is up to over 75%, the time is short, the cost is low, and the extraction method is suitable for industrial application.
According to an embodiment of the present invention, the walnut oil extraction method may further have the following additional technical features:
according to the embodiment of the invention, the particle size of the walnut pieces is 10-60 meshes. Therefore, the crushed walnut particles are moderate, and the subsequent compressed gas can enter the crushed walnut particles to crush cells. If the particle size of the walnut pieces is too large, compressed gas is not favorably introduced and the walnut pieces are crushed; if the particle size of the walnut pieces is too small, the oil yield cannot be further improved, and the process difficulty is increased for realizing smaller-sized particles. Preferably, the particle size of the walnut pieces is 10-30 meshes.
According to an embodiment of the invention, the ratio of the volume of the carbonated material to the volume of the walnut pieces is 1: (1-9). Therefore, the compressed gas can fully act on the walnut kernel cells, and the extraction efficiency of the walnut oil is improved. If the volume of the carbon dioxide is too large, the closed container (such as a sealing bag) is easy to damage in the pressure relief process; if the volume is too small, the desired extraction effect is not achieved. Preferably, the ratio of the volume of the carbon dioxide gas to the volume of the walnut pieces is 1: (1-3).
According to the embodiment of the invention, the pressure treatment is carried out at the temperature of 5-30 ℃ for 5-20 minutes and at the pressure of 50-300 MPa. Therefore, the walnut oil extraction efficiency can be improved. Preferably, the pressure treatment is carried out at the temperature of 20-30 ℃ for 5-15 minutes and under the pressure of 50-150 MPa.
According to the embodiment of the invention, the pressure relief rate is 100-200 MPa/s. Therefore, the cells can be fully crushed, and the subsequent squeezing extraction is facilitated.
According to an embodiment of the present invention, the closed container is a sealable nylon polyethylene bag. Therefore, the material can bear high-pressure environment, is not easy to crack and has compressibility.
According to the embodiment of the invention, the pressing is carried out by adopting a screw press, and the screw rotating speed is 5-20 r/min. Thereby, the grease can be pressed out.
The method for refining the crude oil obtained by the pressing treatment in the present invention is not limited strictly, and may include at least one of the following operations, such as dehydration, degumming, alkali refining, adsorption, filtration, etc., and may be selected flexibly according to the actual situation.
According to an embodiment of the present invention, the walnut oil extraction method comprises: breaking the skin of the walnut, and collecting the walnut kernels; crushing the walnut kernels to 10-30 meshes to obtain crushed walnut kernels; placing the walnut pieces into a nylon polyethylene bag, and filling carbon dioxide into the nylon polyethylene bag, wherein the volume ratio of the filled carbon dioxide to the volume of the walnut pieces is 1: (1-3), sealing, treating at the temperature of 20-30 ℃ and under the pressure of 50-150 MPa for 5-15 minutes, and then releasing pressure at the speed of 100-200 MPa/s; squeezing the product obtained in the previous step by using a screw squeezer, wherein the screw rotating speed is 5-20 r/min, and obtaining crude oil; and refining the crude oil to obtain the walnut oil. Therefore, the extraction rate of the walnut oil by adopting the method is up to more than 75%, the time consumption is short, the cost is low, and the method is suitable for industrial application.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Detailed Description
The scheme of the invention will be explained with reference to the examples. It will be appreciated by those skilled in the art that the following examples are illustrative of the invention only and should not be taken as limiting the scope of the invention. The examples, where specific techniques or conditions are not indicated, are to be construed according to the techniques or conditions described in the literature in the art or according to the product specifications. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products commercially available.
Example 1
In this example, walnut oil was extracted as follows:
(1) selecting and peeling walnut kernels: selecting fresh walnut kernels, and physically peeling the walnut kernels without insect damage, mildew and plump fruits;
(2) crushing: crushing walnut kernels to 20 meshes;
(3) preliminary pressing: filling crushed walnuts into a nylon polyethylene bag according to the volume ratio of 2:1 of the crushed walnuts to gas, filling carbon dioxide, sealing, putting into pressure treatment equipment, setting the treatment pressure at 100MPa, the treatment temperature at 25 ℃, the treatment time at 10min, and releasing pressure to normal pressure at the rate of 100 MPa/s;
(4) carrying out spiral squeezing: and after preliminary pressing, squeezing by adopting a screw press to obtain crude oil, wherein the screw rotating speed is 10 r/min.
(5) Refining: stirring the crude oil at 50 deg.C for 20min, precipitating for 24h, centrifuging, filtering, removing colloid, and collecting filtrate;
and (3) decoloring: adding 9% of activated clay into the filtrate, stirring at 110 deg.C and 300r/min for 40min, and centrifuging to obtain oleum Juglandis. The extraction rate of the walnut oil is 83 percent.
Percent of extraction rate (weight of extracted oil/oil content of fresh walnut)%
Note that: the fat content of fresh walnut is 29.9%.
Example 2
In this example, walnut oil was extracted as follows:
(1) selecting and peeling walnut kernels: selecting fresh walnut kernels, and physically peeling the walnut kernels without insect damage, mildew and plump fruits;
(2) crushing: crushing walnut kernels to 20 meshes;
(3) preliminary pressing: filling crushed walnut into a nylon polyethylene bag according to the volume ratio of the crushed walnut to gas of 1:1, filling carbon dioxide, sealing, putting into pressure treatment equipment, setting the treatment pressure at 150MPa, the treatment temperature at 25 ℃, the treatment time at 5min, and releasing pressure to normal pressure at the rate of 150 MPa/s;
(4) carrying out spiral squeezing: and after preliminary pressing, squeezing by adopting a screw press to obtain crude oil, wherein the screw rotating speed is 10 r/min.
(5) Refining: the same as in example 1. The extraction rate of the walnut oil is 87 percent.
Percent of extraction rate (weight of extracted oil/oil content of fresh walnut)%
Note that: the fat content of fresh walnut is 29.9%.
Comparative example 1
Walnut oil was extracted according to the method of example 1 except that step (3) was not included.
The extraction rate of the walnut oil obtained by the method is only 45 percent, thereby showing that the gas compression and pressure relief operation are obviously beneficial to oil production and improving the extraction rate.
Comparative example 2
Walnut oil was extracted according to the method of example 1 except that in the step (2), the particle size of the walnut pieces was 5 mesh.
The extraction rate of the walnut oil obtained by the method is 65 percent.
The result shows that the grain size of the walnut pieces is larger, so that the permeation of compressed gas is not facilitated, and the extraction of grease is reduced.
Comparative example 3
Walnut oil was extracted according to the method of example 1, except that in step (3), the volume ratio of walnut pieces to gas was 10: 1.
The extraction rate of the walnut oil obtained by the method is 50%.
The result shows that the use amount of the gas is not favorable for extracting the grease.
Comparative example 4
Walnut oil was extracted according to the method of example 1 except that, in the step (3), the pressure treatment time was 1 minute.
The extraction rate of the walnut oil obtained by the method is 58%.
The result shows that the oil extraction rate can be increased only by meeting a certain pressure maintaining time.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. The walnut oil extraction method is characterized by comprising the following steps:
breaking the skin of the walnut, and collecting the walnut kernels;
crushing the walnut kernels to obtain crushed walnut kernels;
placing the walnut pieces in a closed container, filling carbon dioxide into the closed container, and carrying out pressurization and pressure relief treatment;
and squeezing and refining the product obtained in the previous step to obtain the walnut oil.
2. The method according to claim 1, wherein the particle size of the walnut pieces is 10-60 mesh.
3. The method according to claim 1, wherein the particle size of the walnut pieces is 10-30 mesh.
4. The method of claim 1, wherein the ratio of the volume of the carbon dioxide insufflation to the volume of the walnut pieces is 1: (1-9).
5. The method of claim 1, wherein the ratio of the volume of the carbon dioxide insufflation to the volume of the walnut pieces is 1: (1-3).
6. The method according to claim 1, wherein the pressure treatment is carried out at a temperature of 5 to 30 ℃ for 5 to 20 minutes under a pressure of 50 to 300 MPa.
7. The method according to claim 1, wherein the pressure treatment is carried out at a temperature of 20 to 30 ℃ for 5 to 15 minutes under a pressure of 50 to 150 MPa.
8. The method according to claim 1, wherein the rate of pressure relief is a rate of 100 to 200 MPa/s;
the closed container is a nylon polyethylene bag which can be sealed.
9. The method according to claim 1, wherein the pressing is performed by a screw press, and the screw rotation speed is 5-20 r/min.
10. The method of claim 1, comprising:
breaking the skin of the walnut, and collecting the walnut kernels;
crushing the walnut kernels to 10-30 meshes to obtain crushed walnut kernels;
placing the walnut pieces into a nylon polyethylene bag, and filling carbon dioxide into the nylon polyethylene bag, wherein the volume ratio of the filled carbon dioxide to the volume of the walnut pieces is 1: (1-3), sealing, treating at the temperature of 20-30 ℃ and under the pressure of 50-150 MPa for 5-15 minutes, and then releasing pressure at the speed of 100-200 MPa/s;
squeezing the product obtained in the previous step by using a screw squeezer, wherein the screw rotating speed is 5-20 r/min, and obtaining crude oil;
and refining the crude oil to obtain the walnut oil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111106360.6A CN113831961A (en) | 2021-09-22 | 2021-09-22 | Walnut oil extraction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111106360.6A CN113831961A (en) | 2021-09-22 | 2021-09-22 | Walnut oil extraction method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113831961A true CN113831961A (en) | 2021-12-24 |
Family
ID=78960307
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111106360.6A Pending CN113831961A (en) | 2021-09-22 | 2021-09-22 | Walnut oil extraction method |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102154054A (en) * | 2011-03-21 | 2011-08-17 | 中国科学院过程工程研究所 | Novel process for preparing vegetable oil with steam explosion-aqueous solvent method |
| WO2016127827A1 (en) * | 2015-02-12 | 2016-08-18 | 江南大学 | Method for extracting maize germ oil assisted by steam explosion and ethanol |
| CN106753759A (en) * | 2016-12-12 | 2017-05-31 | 中国农业科学院农产品加工研究所 | The method of high efficiency extraction capsicum seed oil |
| CN108003219A (en) * | 2017-12-12 | 2018-05-08 | 安徽省寿县丰茂农产品开发有限公司 | A kind of can improve cracks rice protein extracting ratio and carries out the method for glycosylation modification to it |
| CN108310018A (en) * | 2018-03-22 | 2018-07-24 | 郝之奎 | A method of extracting natural plant active constituent using cold quick-fried technology |
| CN108659951A (en) * | 2018-05-31 | 2018-10-16 | 陕西海源生态农业有限公司 | A kind of production technology of squeezing walnut oil |
| CN111548853A (en) * | 2020-05-21 | 2020-08-18 | 崔艳兰 | Preparation method of edible oil capable of effectively reducing aflatoxin content |
-
2021
- 2021-09-22 CN CN202111106360.6A patent/CN113831961A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102154054A (en) * | 2011-03-21 | 2011-08-17 | 中国科学院过程工程研究所 | Novel process for preparing vegetable oil with steam explosion-aqueous solvent method |
| WO2016127827A1 (en) * | 2015-02-12 | 2016-08-18 | 江南大学 | Method for extracting maize germ oil assisted by steam explosion and ethanol |
| CN106753759A (en) * | 2016-12-12 | 2017-05-31 | 中国农业科学院农产品加工研究所 | The method of high efficiency extraction capsicum seed oil |
| CN108003219A (en) * | 2017-12-12 | 2018-05-08 | 安徽省寿县丰茂农产品开发有限公司 | A kind of can improve cracks rice protein extracting ratio and carries out the method for glycosylation modification to it |
| CN108310018A (en) * | 2018-03-22 | 2018-07-24 | 郝之奎 | A method of extracting natural plant active constituent using cold quick-fried technology |
| CN108659951A (en) * | 2018-05-31 | 2018-10-16 | 陕西海源生态农业有限公司 | A kind of production technology of squeezing walnut oil |
| CN111548853A (en) * | 2020-05-21 | 2020-08-18 | 崔艳兰 | Preparation method of edible oil capable of effectively reducing aflatoxin content |
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