CN113444571A - Physical deacidification and deodorization system for vegetable oil - Google Patents
Physical deacidification and deodorization system for vegetable oil Download PDFInfo
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- CN113444571A CN113444571A CN202110851235.1A CN202110851235A CN113444571A CN 113444571 A CN113444571 A CN 113444571A CN 202110851235 A CN202110851235 A CN 202110851235A CN 113444571 A CN113444571 A CN 113444571A
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- 238000004332 deodorization Methods 0.000 title claims abstract description 98
- 235000015112 vegetable and seed oil Nutrition 0.000 title claims abstract description 65
- 239000008158 vegetable oil Substances 0.000 title claims abstract description 65
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 42
- 230000018044 dehydration Effects 0.000 claims abstract description 41
- 238000011282 treatment Methods 0.000 claims abstract description 29
- 239000002253 acid Substances 0.000 claims abstract description 4
- 239000003921 oil Substances 0.000 claims description 108
- 235000019198 oils Nutrition 0.000 claims description 108
- 230000001877 deodorizing effect Effects 0.000 claims description 11
- 238000000034 method Methods 0.000 abstract description 13
- 230000008569 process Effects 0.000 abstract description 11
- 230000000694 effects Effects 0.000 abstract description 6
- 230000008901 benefit Effects 0.000 abstract description 5
- 239000000126 substance Substances 0.000 abstract description 3
- 208000005156 Dehydration Diseases 0.000 description 28
- -1 glycidyl ester Chemical class 0.000 description 10
- 239000004519 grease Substances 0.000 description 8
- 238000012360 testing method Methods 0.000 description 6
- 230000009471 action Effects 0.000 description 5
- 238000001514 detection method Methods 0.000 description 5
- 239000010773 plant oil Substances 0.000 description 5
- 239000004014 plasticizer Substances 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000006467 substitution reaction Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004061 bleaching Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 235000013305 food Nutrition 0.000 description 2
- 235000021588 free fatty acids Nutrition 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000000049 pigment Substances 0.000 description 2
- 230000000750 progressive effect Effects 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 238000012502 risk assessment Methods 0.000 description 2
- 231100000678 Mycotoxin Toxicity 0.000 description 1
- 150000001413 amino acids Chemical class 0.000 description 1
- 230000000711 cancerogenic effect Effects 0.000 description 1
- 231100000315 carcinogenic Toxicity 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 238000004042 decolorization Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000032050 esterification Effects 0.000 description 1
- 238000005886 esterification reaction Methods 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 239000003205 fragrance Substances 0.000 description 1
- 125000003055 glycidyl group Chemical group C(C1CO1)* 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000002636 mycotoxin Substances 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 231100000167 toxic agent Toxicity 0.000 description 1
- 239000003440 toxic substance Substances 0.000 description 1
- 235000021122 unsaturated fatty acids Nutrition 0.000 description 1
- 150000004670 unsaturated fatty acids Chemical class 0.000 description 1
- 239000010913 used oil Substances 0.000 description 1
Images
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
- 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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- Life Sciences & Earth Sciences (AREA)
- Microbiology (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Fats And Perfumes (AREA)
Abstract
The invention provides a physical vegetable oil deacidification and deodorization system, which comprises at least one group of treatment devices; the treatment device comprises a dehydration tower, an acid removal tower, a decoloration tower and a deodorization tower; the dehydration tower, the deacidification tower, the decoloration tower and the deodorization tower can be connected in series at will; the vacuum degree of the dehydration tower is 9-11mbar, the temperature is 150-; the vacuum degree of the deacidification tower is 1-2mbar, the temperature is 220-; the vacuum degree of the decoloring tower is 1-2mbar, the temperature is 230-; the vacuum degree of the deodorization tower is 0.5-1mbar, the temperature is 250-. The physical deacidification and deodorization system for the vegetable oil by using the deodorization system has the advantages of high process stability, stable treatment effect and standard substance content in the vegetable oil finished product.
Description
Technical Field
The invention relates to the technical field of vegetable oil refining, in particular to a physical deacidification and deodorization system for vegetable oil.
Background
The vegetable oil is rich in beneficial substances such as unsaturated fatty acid, amino acid and the like, and is the most widely used oil at present. With the increasing requirements of people on food health and food safety, the quality requirement of vegetable oil is gradually improved.
Due to the complex compounds in the vegetable oil, the vegetable oil inevitably changes along with the environmental change in the production and storage processes, such as the combination of the compounds, the decomposition of the compounds and the like, so that the fragrance of the vegetable oil is disturbed, and the quality of the vegetable oil is influenced.
Among the indexes of the refined product oil, the two indexes of glycidyl ester and mycotoxin are the most difficult to control. According to the current research progress, the glycidyl ester content of the vegetable oil is low, but the content of the vegetable oil is increased rapidly through a high-temperature deodorization process; the glycidyl ester is harmless to human bodies, is an esterification product of glycidyl oil and fatty acid, but the glycidyl ester which is metabolized in the human bodies and then is regenerated is a carcinogenic toxic substance, and European Union regulations draft case from 2017 and 9 months requires that the content of the glycidyl ester in the vegetable oil is less than or equal to 1000 mug/kg. At present, the content of glycidyl ester in vegetable oil is not required in China, but the risk analysis is carried out in 2017 by the State food and drug administration, and the risk analysis is listed as risk monitoring.
The plant oil deodorization process is an important process for refining the plant oil, in the process, the content of glycidyl ester needs to be prevented from rising, the content of fungicidin, the content of plasticizer and the like in the plant oil needs to be reduced, the existing deodorization treatment method applied to the plant oil is a direct steam stripping method, and in the process, because the technological parameters for controlling the content of the glycidyl ester are opposite to the technological parameters for controlling the content of the fungicidin and the content of the plasticizer, the two quality indexes are difficult to be ensured to be in a qualified range in the production practice by utilizing the existing technological equipment, so that the defects of unstable technological treatment effect and poor detection qualification rate of the content of the glycidyl ester, the content of the fungicidin and the content of the plasticizer in the plant oil are caused.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a physical vegetable oil deacidification and deodorization system, in particular to a deodorization system which is provided with at least one group of treatment devices, wherein each treatment device comprises four packed towers, and the deodorization system has the advantages of reasonable design, strong practicability and convenience in operation and use. The physical deacidification and deodorization system for the vegetable oil by using the deodorization system has the advantages of high process stability, stable treatment effect and standard substance content in the vegetable oil finished product.
The technical scheme of the invention is as follows:
a physical deacidification and deodorization system for vegetable oil comprises at least one group of treatment devices;
the treatment device comprises a dehydration tower, an acid removal tower, a decoloration tower and a deodorization tower;
the dehydration tower, the deacidification tower, the decoloration tower and the deodorization tower can be connected in series at will;
the vacuum degree of the dehydration tower is 9-11mbar, the temperature is 150-;
the vacuum degree of the deacidification tower is 1-2mbar, the temperature is 220-;
the vacuum degree of the decoloring tower is 1-2mbar, the temperature is 230-;
the vacuum degree of the deodorization tower is 0.5-1mbar, the temperature is 250-;
wherein, the dehydrating tower is mainly used for removing air and moisture in grease; the deacidification tower is mainly used for removing free fatty acid in the grease; the main action color of the decoloring tower is mainly used for removing pigments in the grease; the deodorizing tower is mainly used for removing odor components in the grease.
Preferably, an oil outlet of the dehydration tower is connected with an oil inlet of a deacidification tower, an oil outlet of the deacidification tower is connected with an oil inlet of a decoloration tower, and an oil outlet of the decoloration tower is connected with an oil inlet of a deodorization tower; the crude vegetable oil is treated in a temperature progressive mode, so that energy consumption caused by temperature fluctuation in the treatment process of the crude vegetable oil is avoided, and the design of the deodorization system is more reasonable.
Preferably, the oil outlet of the deodorization tower is divided into five paths, one path is connected with the oil inlet of the dehydration tower, the other path is connected with the oil inlet of the deacidification tower, the other path is connected with the oil inlet of the decoloration tower, the other path is connected with the oil inlet of the deodorization tower, and the other path is connected with the product oil storage tank; by the arrangement, the direction of the vegetable oil can be flexibly adjusted according to the vegetable oil detection result of the oil outlet of the deodorization tower; when the detection result of the vegetable oil does not meet the control requirement, the vegetable oil can be returned to any packed tower for circulation according to the requirement until the vegetable oil is qualified.
Preferably, a heat exchanger A and a pump A are arranged on a connecting pipeline between an oil outlet of the dehydration tower and an oil inlet of the deacidification tower; a heat exchanger B and a pump B are arranged on a connecting pipeline between an oil outlet of the deacidification tower and an oil inlet of the decoloration tower; a heat exchanger C and a pump C are arranged on a connecting pipeline of an oil outlet of the decoloring tower and an oil inlet of the deodorizing tower; a heat exchanger D and a pump D are arranged on a connecting pipeline between an oil outlet of the deodorization tower and an oil inlet of the dehydration tower, an oil inlet of the deacidification tower, an oil inlet of the decoloration tower and an oil inlet of the deodorization tower; the heat exchanger A, the heat exchanger B, the heat exchanger C and the heat exchanger D are arranged, so that the vegetable oil can be preheated or precooled conveniently, the temperature difference between the vegetable oil and the packed tower can be reduced, and the up-and-down fluctuation of the temperature of the vegetable oil can be reduced.
Preferably, a valve A is installed on a connecting pipeline between an oil outlet of the deodorization tower and an oil inlet of the dehydration tower, a valve B is installed on a connecting pipeline between an oil outlet of the deodorization tower and an oil inlet of the deacidification tower, a valve C is installed on a connecting pipeline between an oil outlet of the deodorization tower and an oil inlet of the decoloration tower, a valve D is installed on a connecting pipeline between an oil outlet of the deodorization tower and an oil inlet of the deodorization tower, and a valve E is installed on a connecting pipeline between an oil outlet of the deodorization tower and a finished oil storage tank; the vegetable oil of deodorization tower oil outlet department of being convenient for nimble goes to changing, improves the flexibility of operation.
Preferably, the vacuum degree of the dehydration tower is 10mbar, the temperature is 155 ℃, and the dehydration time is 3 min.
Preferably, the vacuum degree of the deacidification tower is 2mbar, the temperature is 225 ℃, and the deacidification time is 5 min.
Preferably, the vacuum degree of the decoloring tower is 1mbar, the temperature is 232 ℃, and the decoloring time is 10 min.
Preferably, the vacuum degree of the deodorization tower is 0.5mbar, the temperature is 250 ℃, and the deodorization time is 3 min.
Preferably, the dehydration tower, the deacidification tower, the decoloration tower and the deodorization tower are all packed towers.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, the plant crude oil is deodorized in a sectional treatment mode, and different removal treatments are completed in different packed towers by respectively controlling the vacuum degrees, the temperatures and the treatment time of the dehydration tower, the deacidification tower, the decoloration tower and the deodorization tower, so that the removal treatment accuracy is improved, the deodorization treatment process is more stable, and the deodorization effect is obvious.
2. In the deodorization system provided by the invention, the lowest temperature is 150 ℃ and the highest temperature is 270 ℃, so that the problem of the content increase of glycidyl ester caused by overhigh temperature is effectively avoided, the defect that fungicidin, plasticizer and the like cannot be removed at low temperature is overcome, the balance of removing various impurities can be achieved through one deodorization system, and the vegetable oil treated by the deodorization system meets the specification.
3. As can be seen from statistics of the detection results of the embodiments 1 to 6, the vegetable oil treated by the deodorization system of the present invention has various indexes meeting the regulations, which indicates that the deodorization system of the present invention has the advantages of high treatment efficiency and stable treatment effect; in addition, through the embodiments 1-6, after the dehydration tower, the deacidification tower, the decoloration tower and the deodorization tower are sequentially used for treatment, the finished vegetable oil products with various indexes meeting the regulations can be directly obtained, and further, the high reasonability and the strong practicability of the deodorization system are demonstrated.
Drawings
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an embodiment of example 1.
In the figure, 1-dehydration tower, 2-deacidification tower, 3-decolorization tower, 4-deodorization tower, 5-valve A, 6-valve B, 7-valve C, 8-valve D, 9-valve E, 10-finished oil storage tank, 11-heat exchanger A, 12-pump A, 13-heat exchanger B, 14-pump B, 15-heat exchanger C, 16-pump C, 17-heat exchanger D, 18-pump D.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present invention, 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, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A physical deacidification and deodorization system for vegetable oil comprises a group of treatment devices;
the treatment device comprises a dehydrating tower 1, an acid removal tower 2, a decoloring tower 3 and a deodorizing tower 4;
the dehydration tower 1, the deacidification tower 2, the decoloration tower 3 and the deodorization tower 4 are all packed towers;
an oil outlet of the dehydration tower 1 is connected with an oil inlet of the deacidification tower 2, an oil outlet of the deacidification tower 2 is connected with an oil inlet of the decoloration tower 3, and an oil outlet of the decoloration tower 3 is connected with an oil inlet of the deodorization tower 4; the crude vegetable oil is treated in a temperature progressive mode, so that energy consumption caused by temperature fluctuation in the treatment process of the crude vegetable oil is avoided, and the design of the deodorization system is more reasonable;
the oil outlet of the deodorization tower 4 is divided into five paths, one path is connected with the oil inlet of the dehydration tower 1, the other path is connected with the oil inlet of the deacidification tower 2, the other path is connected with the oil inlet of the decoloration tower 3, the other path is connected with the oil inlet of the deodorization tower 4, and the other path is connected with the product oil storage tank 10; by the arrangement, the direction of the vegetable oil can be flexibly adjusted according to the vegetable oil detection result of the oil outlet of the deodorization tower 4;
a valve A5 is installed on a connecting pipeline between an oil outlet of the deodorization tower 4 and an oil inlet of the dehydration tower 1, a valve B6 is installed on a connecting pipeline between an oil outlet of the deodorization tower 4 and an oil inlet of the deacidification tower 2, a valve C7 is installed on a connecting pipeline between an oil outlet of the deodorization tower 4 and an oil inlet of the decoloration tower 3, a valve D8 is installed on a connecting pipeline between an oil outlet of the deodorization tower 4 and an oil inlet of the deodorization tower 4, and a valve E9 is installed on a connecting pipeline between an oil outlet of the deodorization tower 4 and a finished oil storage tank 10; the vegetable oil at the oil outlet of the deodorization tower 4 can be conveniently and flexibly converted, and the operation flexibility is improved;
a heat exchanger A11 and a pump A12 are arranged on a connecting pipeline between an oil outlet of the dehydration tower 1 and an oil inlet of the deacidification tower 2; a heat exchanger B13 and a pump B14 are arranged on a connecting pipeline between an oil outlet of the deacidification tower 2 and an oil inlet of the decoloration tower 3; a heat exchanger C15 and a pump C16 are arranged on a connecting pipeline between an oil outlet of the decoloring tower 3 and an oil inlet of the deodorizing tower 4; a heat exchanger D17 and a pump D18 are arranged on a connecting pipeline between an oil outlet of the deodorization tower 4 and an oil inlet of the dehydration tower 1, an oil inlet of the deacidification tower 2, an oil inlet of the decoloration tower 3 and an oil inlet of the deodorization tower 4; the arrangement of the heat exchanger A11, the heat exchanger B13, the heat exchanger C15 and the heat exchanger D17 is convenient for preheating or precooling the vegetable oil, reduces the temperature difference between the vegetable oil and the packed tower, and reduces the up-and-down fluctuation of the temperature of the vegetable oil;
the vacuum degree of the dehydration tower 1 is 10mbar, the temperature is 155 ℃, and the dehydration time is 3 min;
the vacuum degree of the deacidification tower 2 is 2mbar, the temperature is 225 ℃, and the deacidification time is 5 min;
the vacuum degree of the decolorizing tower 3 is 1mbar, the temperature is 232 ℃, and the decolorizing time is 10 min;
the vacuum degree of the deodorizing tower 4 is 0.5mbar, the temperature is 250 ℃, and the deodorizing time is 3 min;
wherein, the dehydrating tower 1 is mainly used for removing air and moisture in grease; the deacidification tower 2 is mainly used for removing free fatty acid in the grease; the main action color of the decoloring tower 3 is mainly used for removing pigments in the grease; the deodorization tower 4 mainly removes odor components in the grease;
when the device is used, crude vegetable oil enters from the top of a dehydration tower 1, enters a heat exchanger A11 after being subjected to air and dehydration treatment, enters a deacidification tower 2 under the action of a pump A12, enters a heat exchanger B13 after being subjected to deacidification treatment, enters a decoloring tower 3 under the action of a pump B14, enters a heat exchanger C15 after being subjected to decoloring treatment, enters a deodorization tower 4 under the action of a pump C16, is detected at an oil outlet of the deodorization tower 4, and enters a finished oil storage tank 10 to be collected after meeting the standard requirement.
Example 2
The difference from the example 1 is that the vacuum degree of the dehydration tower 1 is 9mbar, the temperature is 160 ℃, and the dehydration time is 7 min;
the vacuum degree of the deacidification tower 2 is 1mbar, the temperature is 230 ℃, and the deacidification time is 3 min;
the vacuum degree of the decolorizing tower 3 is 1.5mbar, the temperature is 240 ℃, and the decolorizing time is 2 min;
the vacuum degree of the deodorizing tower 4 is 0.8mbar, the temperature is 260 deg.C, and the deodorizing time is 1min.
Example 3
The difference from the example 1 is that the vacuum degree of the dehydration tower 1 is 11mbar, the temperature is 150 ℃, and the dehydration time is 2 min;
the vacuum degree of the deacidification tower 2 is 1.5mbar, the temperature is 220 ℃, and the deacidification time is 10 min;
the vacuum degree of the decolorizing tower 3 is 1mbar, the temperature is 240 ℃, and the decolorizing time is 8 min;
the vacuum degree of the deodorizing tower 4 is 1mbar, the temperature is 270 ℃, and the deodorizing time is 5 min.
Example 4
The difference from example 1 is that the vacuum of the deodorisation column 4 is 0.9mbar, the temperature is 252 ℃ and the deodorisation time is 3 min.
Example 5
The difference from example 1 is that the vacuum of the deodorisation column 4 is 0.7mbar, the temperature is 250 ℃ and the deodorisation time is 3 min.
Example 6
The difference from example 1 is that the degree of vacuum of the bleaching column 3 is 1.3mbar, the temperature is 232 ℃ and the bleaching time is 3 min.
The vegetable oils of examples 1-6 were tested and the results are shown in tables 1-6.
Table 1 example 1 test results for finished vegetable oils
Table 2 example 2 test results for finished vegetable oils
Table 3 example 3 test results for finished vegetable oils
Table 4 example 4 test results for finished vegetable oils
Table 5 example 5 test results for finished vegetable oils
Table 6 example 6 test results for finished vegetable oils
It can be seen by combining tables 1 to 6 that the indexes of the finished vegetable oil are qualified when the same crude vegetable oil is treated by using the deodorization system of the invention, which further illustrates that the deodorization system has the advantage of high stability, and can illustrate that the deodorization system has good treatment effect on the crude vegetable oil and overcome the problem that the treatment temperature among impurities is difficult to balance.
Although the present invention has been described in detail by referring to the preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made on the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and these modifications or substitutions are within the scope of the present invention/any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A physical deacidification and deodorization system for vegetable oil is characterized by comprising at least one group of treatment devices;
the treatment device comprises a dehydration tower, an acid removal tower, a decoloration tower and a deodorization tower;
the dehydration tower, the deacidification tower, the decoloration tower and the deodorization tower can be connected in series at will;
the vacuum degree of the dehydration tower is 9-11mbar, the temperature is 150-;
the vacuum degree of the deacidification tower is 1-2mbar, the temperature is 220-;
the vacuum degree of the decoloring tower is 1-2mbar, the temperature is 230-;
the vacuum degree of the deodorization tower is 0.5-1mbar, the temperature is 250-.
2. The physical vegetable oil deacidification and deodorization system according to claim 1, wherein an oil outlet of the dehydration tower is connected with an oil inlet of a deacidification tower, an oil outlet of the deacidification tower is connected with an oil inlet of a decoloration tower, and an oil outlet of the decoloration tower is connected with an oil inlet of a deodorization tower.
3. The physical vegetable oil deacidification and deodorization system according to claim 2, wherein the oil outlet of the deodorization tower is divided into five paths, one path is connected with the oil inlet of the dehydration tower, the other path is connected with the oil inlet of the deacidification tower, the other path is connected with the oil inlet of the decoloration tower, the other path is connected with the oil inlet of the deodorization tower, and the other path is connected with the product oil storage tank.
4. A physical vegetable oil deacidification and deodorization system as claimed in claim 3, wherein a valve a is installed on a connection pipeline between an oil outlet of the deodorization tower and an oil inlet of the dehydration tower, a valve B is installed on a connection pipeline between an oil outlet of the deodorization tower and an oil inlet of the deacidification tower, a valve C is installed on a connection pipeline between an oil outlet of the deodorization tower and an oil inlet of the decoloration tower, a valve D is installed on a connection pipeline between an oil outlet of the deodorization tower and an oil inlet of the deodorization tower, and a valve E is installed on a connection pipeline between an oil outlet of the deodorization tower and a storage tank for a product oil.
5. The physical vegetable oil deacidification and deodorization system according to claim 3, wherein a heat exchanger A and a pump A are installed on a connecting pipeline between an oil outlet of the dehydration tower and an oil inlet of the deacidification tower; a heat exchanger B and a pump B are arranged on a connecting pipeline between an oil outlet of the deacidification tower and an oil inlet of the decoloration tower; a heat exchanger C and a pump C are arranged on a connecting pipeline of an oil outlet of the decoloring tower and an oil inlet of the deodorizing tower; and a heat exchanger D and a pump D are arranged on a connecting pipeline between the oil outlet of the deodorization tower and the oil inlet of the dehydration tower, the oil inlet of the deacidification tower, the oil inlet of the decoloration tower and the oil inlet of the deodorization tower.
6. The physical deacidification and deodorization system for vegetable oil according to claim 1, wherein the vacuum degree of said dehydration tower is 10mbar, the temperature is 155 ℃, and the dehydration time is 3 min.
7. The physical deacidification and deodorization system for vegetable oil according to claim 1, wherein the vacuum degree of the deacidification tower is 2mbar, the temperature is 225 ℃, and the deacidification time is 5 min.
8. The physical vegetable oil deacidification and deodorization system according to claim 1, wherein the vacuum degree of the decoloration tower is 1mbar, the temperature is 232 ℃, and the decoloration time is 10 min.
9. The physical vegetable oil deacidification and deodorization system according to claim 1, wherein the vacuum degree of the deodorization tower is 0.5mbar, the temperature is 250 ℃, and the deodorization time is 3 min.
10. The physical vegetable oil deacidification and deodorization system according to any one of claims 1 to 9, wherein the dehydration tower, the deacidification tower, the decoloration tower and the deodorization tower are all packed towers.
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