Device and method for removing hazardous substances in edible oil

Abstract

The invention belongs to the technical field of edible oil refining, and discloses a device and a method for removing hazardous substances in edible oil. The device comprises an oil drop alcohol bubble detoxification unit, a temporary storage tank, an oil pump and a centrifugal separation unit, the oil drop alcohol bubble detoxification unit comprises a low-molecular alcohol gas feeding pipe, a low-molecular alcohol gas pressurizing pipe, an edible oil pipe, an oil chamber, an oil drop liquid bubble regulator, an adhesion chamber, a cooling pipe, a stirring chamber and a solvent pipe. The device and the method are high in detoxification efficiency, low in energy consumption and small in solvent dosage.

Description

Technical Field

[0001] The invention belongs to the technical field of edible oil refining, and more specifically, relates to a device and method for removing harmful substances from edible oil. Background Art

[0002] Phthalatic Acid Esters (PAEs) are a class of substances composed of two adjacent plastic nonlinear fatty chains and a rigid planar aromatic ring. They are generally viscous liquids with low volatility, insoluble in water, and easily soluble in organic solvents such as methanol, ethanol, and ether. Phthalates can enhance the elasticity and plasticity of plastics and can be used as plasticizers in food packaging materials, toys, hoses, and other materials.

[0003] Phthalate plasticizers mainly include dibutyl phthalate (DBP), di(2-ethylhexyl) phthalate (DEHP), diisononyl phthalate (DINP), etc. When PAEs are used as plasticizers, they are usually connected between polymer macromolecules by van der Waals forces or hydrogen bonds, and are easy to migrate out of the polymer. Therefore, when using packaging materials with PAEs plasticizers, a certain amount of PAEs will migrate into food, and long-term use will cause potential harm to the human body.

[0004] Whether it is the planting and growth of oil raw materials or the production and processing of edible oil, plant oils and their products are inevitably contaminated by PAEs. In order to improve the safety of edible oils and reduce the risk of exposure to PAEs in the population, it is imperative to develop efficient methods for removing PAEs from oils and fats.

[0005] At present, the methods for removing PAEs from oils and fats include physical adsorption, deodorization, molecular distillation and solvent extraction. The same adsorbent has a good effect on the removal of dimethyl phthalate (DMP) and diethyl phthalate (DEP) with a relatively small molecular weight, and a general effect on the adsorption and removal of DEHP with a large molecular weight; long-term high-temperature deodorization can distill and remove plasticizers from oils and fats, but it is easy to cause the loss of vitamin E in oils and fats and produce trans fatty acids and plasticizers enriched in the deodorized distillate; although molecular distillation technology can distill and remove plasticizers from oils and fats, it has a small processing capacity, high energy consumption, and some nutrients are also taken away; solvent extraction uses a large amount of solvent and many extraction times, resulting in high detoxification costs.

[0006] Therefore, it is urgent to propose a device and method for removing harmful substances from edible oil. Summary of the invention

[0007] The purpose of the present invention is to address the deficiencies of the prior art and to provide a device and method for removing harmful substances from edible oil. The device and method of the present invention have high detoxification efficiency, low energy consumption, and small solvent usage.

[0008] In order to achieve the above-mentioned object, the present invention provides a device for removing harmful substances from edible oil, the device comprising an oil drop alcohol bubble detoxification unit, a temporary storage tank, an oil pump and a centrifugal separation unit;

[0009] The oil drop alcohol bubble detoxification unit comprises a low molecular alcohol gas feed pipe, a low molecular alcohol gas boost pipe, an edible oil pipe, an oil chamber, an oil drop bubble regulator, an attachment chamber, a cooling pipe, a stirring chamber and a solvent pipe;

[0010] The low molecular alcohol gas feed pipe is connected to the inlet of the low molecular alcohol gas boosting pipe, and a nozzle is provided at the outlet of the low molecular alcohol gas boosting pipe; the oil chamber is provided on the upper and lower sides of the low molecular alcohol gas boosting pipe; the outlet of the low molecular alcohol gas boosting pipe is connected to the inlet of the oil droplet bubble regulator through the nozzle, and the edible oil pipe is connected to the oil chamber through the oil chamber; the outlet of the oil droplet bubble regulator is connected to the inlet of the attachment chamber;

[0011] An oil droplet and bubble attachment net is arranged in the attachment chamber, and a collection chamber is arranged at the lower part of the attachment chamber, and the collection chamber is used to collect the oil droplet mixture sliding down from the oil droplet and bubble attachment net; the outlet of the attachment chamber is connected with the inlet of the stirring chamber through a cooling pipe, and a one-way valve is arranged on the cooling pipe, and the outlet of the collection chamber is connected with the inlet end of the one-way valve; a solvent inlet is arranged on the pipe wall of the cooling pipe between the outlet end of the one-way valve and the inlet of the stirring chamber, and the solvent inlet is connected with the solvent pipe;

[0012] The stirring chamber is provided with a stirring collecting pipe, and the stirring collecting pipe is used to deliver the stirred mixed solution in the stirring chamber into the temporary storage tank;

[0013] The outlet of the temporary storage tank is connected to the centrifugal separation unit through the oil pump;

[0014] The centrifugal separation unit is used to separate the edible oil and the low-molecular alcohol solution in the temporary storage tank and to heat and desolventize the separated edible oil.

[0015] According to the present invention, preferably, the nozzle is a porous structure, and the diameter of the holes is 0.2-1.0 mm.

[0016] According to the present invention, preferably, the outlet of the oil chamber is provided with a gear adjustment device, which is used to adjust the amount of edible oil entering the inlet of the oil droplet bubble regulator, and cooperate with the oil droplet bubble regulator to adjust the impact force of the mixed medium, thereby obtaining oil droplets with different diameters. In the present invention, as a preferred embodiment, the gear adjustment device is provided with three gears, such as Figure 1 As shown, there are the first gear position A1, the second gear position A2, and the third gear position A3, wherein:

[0017] The first gear position A1 controls zero to one third of the total flow;

[0018] The second gear A2 controls one third to two thirds of the total flow;

[0019] The third gear A3 controls two-thirds to all of the total flow.

[0020] According to the present invention, preferably, a manhole is provided on the side wall of the attachment chamber. In the present invention, the manhole is used to check the state of the oil droplet bubble on the oil droplet bubble attachment net in the attachment chamber.

[0021] According to the present invention, preferably, the attachment chamber is further provided with an attachment net regulator, and the attachment net regulator is used to adjust the opening and closing angle of the oil droplet and bubble attachment net.

[0022] In the present invention, the opening and closing angle of the oil droplet bubble attachment net is adjusted by the attachment net adjuster, so that more oil droplets and bubbles can be attached to the oil droplet bubble attachment net.

[0023] According to the present invention, preferably, the stirring chamber is also provided with a temperature control tube, a motor and a stirring device;

[0024] The stirring device is provided with a multi-stage stirring blade head.

[0025] According to the present invention, preferably, the centrifugal separation unit comprises a centrifuge, a heat exchanger, an evaporation tube array, a desolventizing tower, a low molecular alcohol gasification compressor and a low molecular alcohol gasification storage tank;

[0026] The outlet of the temporary storage tank is connected to the inlet of the centrifuge through the oil pump; the centrifuge is provided with an edible oil solution outlet and a low molecular alcohol solution outlet;

[0027] The edible oil solution outlet is connected to the inlet of the desolventizing tower through the cold source inlet and outlet of the heat exchanger; the desolventizing tower is provided with an edible oil product outlet and a solvent outlet;

[0028] The low molecular alcohol solution outlet is connected to the low molecular alcohol vaporization storage tank through the evaporation tube array and the low molecular alcohol vaporization compressor in sequence.

[0029] According to the present invention, preferably, the heat source inlet of the heat exchanger is connected to the water vapor conveying device; and the heat source outlet of the heat exchanger is connected to the steam condensate removal device.

[0030] According to the present invention, preferably, the solvent outlet is connected to the inlet of the low molecular alcohol vaporization compressor.

[0031] According to the present invention, preferably, the outlet of the low molecular alcohol gasification storage tank is connected to the inlet of the low molecular alcohol gas feed pipe.

[0032] Another aspect of the present invention provides a method for removing harmful substances from edible oil, the method using the above-mentioned device, comprising the following steps:

[0033] S1: sending the low molecular alcohol gas pressurized by the low molecular alcohol gas boosting pipe to the oil droplet bubble regulator through a nozzle together with the edible oil containing harmful substances in the oil chamber, obtaining the oil droplet bubble and sending it to the attachment chamber;

[0034] S2: In the attachment chamber, a portion of the oil droplet bubbles are attached to the oil droplet bubble attachment net (which is conducive to the enrichment of harmful substances) and slide down to the collection chamber; the oil droplet bubbles in the attachment chamber that are not attached to the oil droplet bubble attachment net are cooled and sent to the stirring chamber together with the oil droplet mixed liquid collected in the collection chamber and the low molecular alcohol solvent for mixing and stirring to obtain a stirred mixed solution;

[0035] S3: using a stirring collection pipe to sequentially send the stirred mixed solution into a centrifugal separation unit through a temporary storage tank and an oil pump; using the centrifugal separation unit to separate the edible oil and the low molecular alcohol solution in the stirred mixed solution, and heating and desolventizing the separated edible oil to obtain an edible oil product.

[0036] According to the present invention, preferably, in step S1:

[0037] The pressure of the low molecular alcohol gas after being pressurized by the low molecular alcohol gas booster pipe is 0.3-1.5 MPa; the low molecular alcohol gas is methanol and / or ethanol;

[0038] The hazardous substance in the hazardous edible oil is at least one of DBP, DEHP, DINP, aflatoxin and zearalenone;

[0039] The diameter of the oil droplet bubble is 10-30 μm;

[0040] In the present invention, the oil chambers are arranged on the upper and lower sides of the low-molecular alcohol gas booster pipe, and the high-pressure and high-speed low-molecular alcohol gas sprayed from the nozzle drives the edible oil to impact the oil droplet bubble regulator. The oil droplet bubble regulator is used to adjust the force of the medium near the nozzle impacting the regulator to form oil droplets with a diameter of 10-30μm. The inner and outer layers of the oil droplet bubbles are both wrapped by low-molecular alcohol and then enter the attachment chamber.

[0041] The method further comprises: when delivering the harmful edible oil in the oil chamber to the oil droplet bubble regulator, adjusting the amount of the harmful edible oil by means of a gear adjustment device, cooperating with the oil droplet bubble regulator to adjust the impact force of the mixed medium, thereby obtaining oil droplet bubbles of different diameters.

[0042] According to the present invention, preferably, in step S2:

[0043] The temperature of the oil droplet bubbles not attached to the oil droplet bubble attachment net in the cooling attachment chamber is 15-35°C;

[0044] The low molecular alcohol solvent comprises 0.01-0.05% of an additive based on the total weight of the low molecular alcohol solvent, wherein the additive is at least one of an organic acid, an inorganic base and an adsorbent; the amount of the low molecular alcohol solvent added is 0-20% of the mass of the edible oil fed into the stirring chamber;

[0045] The mixing and stirring is multi-stage stirring, the speed of the mixing and stirring is 5000-20000 r / min, and the temperature of the mixing and stirring is 30-55°C.

[0046] In the present invention, the oil droplets in the attachment chamber that are not attached to the oil droplet bubble attachment net are cooled by the cooling tube, attached to the cooling tube, and can enter the stirring chamber by being sucked in. The oil droplets gradually increase on the oil droplet bubble attachment net, slide down to the collection chamber, and also enter the stirring chamber by being sucked in.

[0047] According to the present invention, preferably, in step S3:

[0048] The stirred mixed solution is temporarily stored in the temporary storage tank for 10-20 minutes;

[0049] In the centrifugal separation unit: the edible oil and the low-molecular alcohol solution in the stirred mixed solution are separated by a centrifuge to obtain an edible oil solution (containing a trace amount of low-molecular alcohol) and a low-molecular alcohol solution; the edible oil solution is subjected to heat exchange with water vapor to increase the temperature and then sent to a desolventizing tower for a first desolventizing treatment to obtain a desolventized low-molecular alcohol solvent and the edible oil product; the low-molecular alcohol solution is separated from high-boiling point substances (such as the harmful substances in the harmful substance-containing edible oil) through a second desolventizing treatment and then subjected to a gasification and compression treatment together with the desolventized low-molecular alcohol solvent to obtain a low-molecular alcohol gas and sent to a low-molecular alcohol gasification storage tank for standby use.

[0050] According to the present invention, preferably, the temperature of the first desolventizing treatment is 100-120°C.

[0051] According to the present invention, preferably, the temperature of the second desolventizing treatment is 90-110°C.

[0052] According to the present invention, preferably, the pressure of the low molecular alcohol gas is 0.2-1.0 MPa.

[0053] The beneficial effects of the technical solution of the present invention are as follows:

[0054] The device and method of the present invention have high detoxification efficiency, low energy consumption and small solvent consumption. The present invention can not only remove plasticizers in oils and fats, but also remove aflatoxins and zearalenone in oils and fats. At the same time, the oil sample treated by the present invention enters the subsequent refining stage, which can significantly reduce the generation of trichloropropane esters and glycidyl esters in the edible oil in the deodorization stage, thereby improving the quality of the edible oil.

[0055] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, wherein like reference numerals generally represent like components throughout the exemplary embodiments of the present invention.

[0057] Figure 1 A schematic structural diagram of a device for removing harmful substances from edible oil provided in Example 1 of the present invention is shown.

[0058] Figure 2 A schematic structural diagram of an oil droplet and bubble attachment net of a device for removing harmful substances from edible oil provided in Example 1 of the present invention is shown.

[0059] Figure 3 A schematic structural diagram of a multi-stage stirring blade head of a stirring device of a device for removing harmful substances from edible oil provided in Example 1 of the present invention is shown.

[0060] The following are the descriptions of the reference numerals:

[0061] A0 edible oil pipe, A1 first gear, A2 second gear, A3 third gear, A4 low molecular alcohol gas booster pipe, A5 nozzle, A6 oil drop bubble regulator, A7 oil drop bubble attachment net, A8 manhole, A9 attachment net regulator, A10 cooling pipe, A11 collection chamber, A12 one-way valve, A13 solvent pipe, A14 temperature control pipe, A15 oil pipe, A16 stirring equipment, A16-1 multi-stage stirring blade of stirring equipment, A16-2 multi-stage stirring gear of stirring equipment, A17 stirring collection pipe, A18 motor, A19 low molecular alcohol gas feed pipe, A20 low molecular alcohol solvent;

[0062] C1 oil chamber, C2 attachment chamber, C3 stirring chamber;

[0063] B1 temporary storage tank, B2 oil pump, B3 centrifuge, B4 heat exchanger, B5 evaporation tube array, B6 desolventizing tower, B7 low molecular alcohol gasification compressor, B8 low molecular alcohol gasification storage tank, B9 edible oil product outlet, B10 solvent outlet;

[0064] D1 water vapor conveying device, D2 steam condensate removal device. DETAILED DESCRIPTION

[0065] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0066] Example 1

[0067] This embodiment provides a device for removing harmful substances from edible oil, such as Figure 1 As shown, the device comprises an oil drop alcohol bubble detoxification unit, a temporary storage tank B1, an oil pump B2 and a centrifugal separation unit;

[0068] The oil drop alcohol bubble detoxification unit comprises a low molecular alcohol gas feed pipe A19, a low molecular alcohol gas booster pipe A4, an edible oil pipe A0, an oil chamber C1, an oil drop bubble regulator A6, an attachment chamber C2, a cooling pipe A10, a stirring chamber C3 and a solvent pipe;

[0069] The low molecular alcohol gas feed pipe A19 is connected to the inlet of the low molecular alcohol gas boosting pipe A4, and the outlet of the low molecular alcohol gas boosting pipe A4 is provided with a nozzle A5, and the nozzle A5 is a porous structure, and the diameter of the hole is 0.3mm; the oil chamber C1 is provided on the upper and lower sides of the low molecular alcohol gas boosting pipe A4; the outlet of the low molecular alcohol gas boosting pipe A4 is connected to the inlet of the oil droplet bubble regulator A6 through the nozzle A5, and the edible oil pipe A0 is connected to the oil chamber C1 through the oil chamber C1; the outlet of the oil chamber C1 is provided with a gear adjustment device, and the gear adjustment device is used to adjust the amount of edible oil entering the inlet of the oil droplet bubble regulator A6, cooperate with the oil droplet bubble regulator, adjust the impact force of the mixed medium, and then obtain oil droplets of different diameters. In this embodiment, the gear adjustment device is provided with a first gear position A1, a second gear position A2, and a third gear position A3; the outlet of the oil droplet bubble regulator A6 is connected to the inlet of the attachment chamber C2;

[0070] A manhole A8 is provided on the side wall of the attachment chamber C2;

[0071] The attachment chamber C2 is provided with an oil droplet bubble attachment net A7 and an attachment net regulator A9, the lower part of the attachment chamber C2 is provided with a collection chamber A11, the collection chamber A11 is used to collect the oil droplets sliding down from the oil droplet bubble attachment net A7; the attachment net regulator A9 is used to adjust the opening and closing angle of the oil droplet bubble attachment net A7; the outlet of the attachment chamber C2 is connected to the inlet of the stirring chamber C3 through a cooling pipe A10, a one-way valve A12 is provided on the cooling pipe A10, the outlet of the collection chamber A11 is connected to the inlet end of the one-way valve A13; a solvent inlet is provided on the pipe wall of the cooling pipe A10 between the outlet end of the one-way valve A12 and the inlet of the stirring chamber C3, and the solvent inlet is connected to the solvent pipe A13;

[0072] The stirring chamber C3 is provided with a temperature control tube A14, a motor A18, a stirring device A16 and a stirring collection tube A17, and the stirring collection tube A17 is used to deliver the stirred mixed solution in the stirring chamber C3 into the temporary storage tank B1; the stirring device A16 is provided with a multi-stage stirring blade head, such as Figure 3 shown.

[0073] The centrifugal separation unit is used to separate the edible oil and the low molecular alcohol solution in the temporary storage tank B1 and to heat and desolventize the separated edible oil. The centrifugal separation unit includes a centrifuge B3, a heat exchanger B4, an evaporation tube array B5, a desolventizing tower B6, a low molecular alcohol gasification compressor B7 and a low molecular alcohol gasification storage tank B8;

[0074] The outlet of the temporary storage tank B1 is connected to the inlet of the centrifuge B3 through the oil pump B2; the centrifuge B3 is provided with an edible oil solution outlet and a low molecular alcohol solution outlet;

[0075] The edible oil solution outlet is connected to the inlet of the desolventizing tower B6 through the cold source inlet and outlet of the heat exchanger B4; the heat source inlet of the heat exchanger B4 is connected to the water vapor conveying device D1; the heat source outlet of the heat exchanger B6 is connected to the steam condensate removal device D2; the desolventizing tower B1 is provided with an edible oil product outlet B9 and a solvent outlet B10;

[0076] The low molecular alcohol solution outlet is connected to the low molecular alcohol vaporization storage tank B8 through the evaporation tube array B5 and the low molecular alcohol vaporization compressor B7 in sequence. The solvent outlet B10 is connected to the inlet of the low molecular alcohol vaporization compressor B7.

[0077] Example 2

[0078] This embodiment provides a method for removing harmful substances from edible oil. The method uses the device described in Example 1 and includes the following steps:

[0079] S1: The gasified and compressed ethanol gas (0.5MPa) is sent to the low-molecular alcohol gas booster pipe A4, and the low-molecular alcohol gas (0.6MPa) boosted by the low-molecular alcohol gas booster pipe A4 is sent to the oil droplet bubble regulator A6 through the nozzle A5 together with the edible oil containing harmful substances in the oil chamber C1 (the high-pressure and high-speed low-molecular alcohol gas sprayed from the nozzle drives the edible oil to collide with the oil droplet bubble regulator), and the oil droplet bubble (diameter 10μm) is obtained and sent to the attachment chamber C2;

[0080] The hazardous substances in edible oils are DBP 3.28mg / kg, DEHP 1.97mg / kg, and DINP 15.0mg / kg;

[0081] S2: Check the manhole A8, start the attachment net regulator A9 to adjust the opening and closing angle of the oil droplet bubble attachment net A7, and in the attachment chamber C2, a part of the oil droplet bubble is attached to the oil droplet bubble attachment net A7 and slides down to the collection chamber A11; the oil droplet bubble in the attachment chamber that is not attached to the oil droplet bubble attachment net A7 is sent into the stirring chamber C3 together with the oil droplet mixed liquid collected in the collection chamber A11 after cooling (cooling temperature 25°C), and the motor A8 is started to mix and stir to obtain a stirred mixed solution;

[0082] The mixing and stirring is multi-stage stirring, the speed of the mixing and stirring is 10000 r / min, and the temperature of the mixing and stirring is 45°C.

[0083] S3: using the stirring collection pipe A17 to sequentially send the stirred mixed solution through the temporary storage tank B1 and the oil pump B2 to the centrifugal separation unit; in the centrifugal separation unit: using the centrifuge B3 to separate the edible oil and ethanol solution in the stirred mixed solution to obtain an edible oil solution and an ethanol solution; after the edible oil solution is heated by heat exchange with water vapor, it is sent to the desolventizing tower B6 for the first desolventizing treatment to obtain a desolventized low-molecular ethanol solvent and the edible oil product; after the second desolventizing treatment, the ethanol solution is subjected to a gasification and compression treatment together with the desolventized low-molecular ethanol solvent to obtain a low-molecular ethanol gas and sent to the low-molecular alcohol gasification storage tank B8 for standby;

[0084] The stirred mixed solution is temporarily stored in the temporary storage tank B1 for 15 minutes;

[0085] The temperature of the first desolventizing treatment is 100°C;

[0086] The temperature of the second desolventizing treatment is 100°C;

[0087] The edible oil product was sampled for hazardous substance content detection, and the results showed that the edible oil product treated by this embodiment contained 0.18 mg / kg DBP, 0.47 mg / kg DEHP, and 5.0 mg / kg DINP.

[0088] Example 3

[0089] The difference between this embodiment and embodiment 2 is only that:

[0090] The hazardous substances in edible oils are aflatoxin B1 30ppb and zearalenone 1000ppb;

[0091] The edible oil product was sampled for hazardous substance content testing, and the results showed that the edible oil product treated by this example contained 8 ppb of aflatoxin B1 and 300 ppb of zearalenone.

[0092] In Examples 2 and 3:

[0093] After the oil sample treated by the device of Example 1 was subjected to subsequent refining and deodorization treatment (deodorization temperature 260°C, deodorization time 90 min), the contents of trichloropropane ester and glycidyl ester in the oil sample were 0.15 mg / kg and 0.08 mg / kg respectively.

[0094] The oil sample that was not treated by the device of Example 1 was directly refined and deodorized (deodorization temperature: 260° C., deodorization time: 90 min). The contents of trichloropropane ester and glycidyl ester in the oil sample were 2.17 mg / kg and 1.2 mg / kg, respectively.

[0095] Example 4

[0096] The only difference between this embodiment and embodiment 1 is that the nozzle is a porous structure, and the diameter of the hole is 0.4 mm.

[0097] Example 5

[0098] This embodiment provides a method for removing harmful substances from edible oil, the method using the device described in Example 4, comprising the following steps:

[0099] S1: The gasified and compressed methanol gas (0.3MPa) is sent to the low-molecular alcohol gas booster pipe A4, and the low-molecular alcohol gas (0.5MPa) boosted by the low-molecular alcohol gas booster pipe A4 is sent to the oil droplet bubble regulator A6 through the nozzle A5 together with the edible oil containing harmful substances in the oil chamber (the high-pressure and high-speed low-molecular alcohol gas sprayed from the nozzle drives the edible oil to collide with the oil droplet bubble regulator A6), and the oil droplet bubble (diameter 15μm) is obtained and sent to the attachment chamber C2;

[0100] The hazardous substances in edible oils are DBP 5.36mg / kg, DEHP 2.57mg / kg, and DINP 18.0mg / kg;

[0101] S2: Check the manhole, start the attachment net regulator A9 to adjust the opening and closing angle of the oil droplet bubble attachment net A7, and in the attachment chamber C2, a part of the oil droplet bubble is attached to the oil droplet bubble attachment net A7 and slides down to the collection chamber A11; the oil droplet bubble in the attachment chamber C2 that is not attached to the oil droplet bubble attachment net A7 is sent into the stirring chamber C3 together with the oil droplet mixed liquid and methanol solvent collected in the collection chamber A11 after cooling (cooling temperature 28°C), and the motor A18 is started to mix and stir to obtain a stirred mixed solution;

[0102] The methanol solvent includes 0.05% sodium hydroxide based on the total weight of the methanol solvent; the amount of the methanol solvent added is 15% of the mass of the edible oil fed into the stirring chamber;

[0103] The mixing and stirring is multi-stage stirring, the mixing and stirring speed is 12000r / min, and the mixing and stirring temperature is 40°C.

[0104] S3: using the stirring collection pipe A17 to sequentially send the stirred mixed solution through the temporary storage tank B1 and the oil pump B2 to the centrifugal separation unit; in the centrifugal separation unit: using the centrifuge B3 to separate the edible oil and the methanol solution in the stirred mixed solution to obtain an edible oil solution and a methanol solution; after the edible oil solution is heated by heat exchange with water vapor, it is sent to the desolventizing tower B6 for the first desolventizing treatment to obtain a desolventized low-molecular methanol solvent and the edible oil product; after the second desolventizing treatment, the methanol solution is subjected to gasification and compression treatment together with the desolventized low-molecular methanol solvent to obtain a low-molecular methanol gas and sent to the low-molecular alcohol gasification storage tank for standby;

[0105] The stirred mixed solution is temporarily stored in the temporary storage tank B1 for 20 minutes;

[0106] The temperature of the first desolventizing treatment is 105°C;

[0107] The temperature of the second desolventizing treatment is 95°C;

[0108] The edible oil product was sampled for hazardous substance content detection, and the results showed that the edible oil product treated by this embodiment contained 0.23 mg / kg DBP, 0.53 mg / kg DEHP, and 5.15 mg / kg DINP.

[0109] Example 6

[0110] The difference between this embodiment and embodiment 5 is only that:

[0111] The hazardous substances in edible oils are aflatoxin B1 30ppb and zearalenone 1000ppb;

[0112] The edible oil product was sampled for hazardous substance content testing, and the results showed that the edible oil product treated by this example contained 9 ppb of aflatoxin B1 and 350 ppb of zearalenone.

[0113] In Examples 5 and 6:

[0114] After the oil sample treated by the device of Example 4 was subjected to subsequent refining and deodorization treatment (deodorization temperature 260°C, deodorization time 90 min), the contents of trichloropropane ester and glycidyl ester in the oil sample were 0.14 mg / kg and 0.09 mg / kg respectively.

[0115] The oil sample that was not treated by the device of Example 4 was directly refined and deodorized (deodorization temperature: 260° C., deodorization time: 90 min). The contents of trichloropropane ester and glycidyl ester in the oil sample were 2.17 mg / kg and 1.2 mg / kg, respectively.

[0116] The oil samples in Examples 2, 3, 5 and 6 may be peanut oil, corn oil, rapeseed oil or the like.

[0117] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A device for removing harmful substances from edible oil, It is characterized in that The device comprises an oil drop alcohol bubble detoxification unit, a temporary storage tank, an oil pump and a centrifugal separation unit; The oil drop alcohol bubble detoxification unit comprises a low molecular alcohol gas feed pipe, a low molecular alcohol gas boost pipe, an edible oil pipe, an oil chamber, an oil drop bubble regulator, an attachment chamber, a cooling pipe, a stirring chamber and a solvent pipe; The low molecular alcohol gas feed pipe is connected to the inlet of the low molecular alcohol gas boosting pipe, and a nozzle is provided at the outlet of the low molecular alcohol gas boosting pipe; the oil chamber is provided on the upper and lower sides of the low molecular alcohol gas boosting pipe; the outlet of the low molecular alcohol gas boosting pipe is connected to the inlet of the oil droplet bubble regulator through the nozzle, and the edible oil pipe is connected to the oil chamber through the oil chamber; the outlet of the oil droplet bubble regulator is connected to the inlet of the attachment chamber; An oil droplet and bubble attachment net is arranged in the attachment chamber, and a collection chamber is arranged at the lower part of the attachment chamber, and the collection chamber is used to collect the oil droplet mixture sliding down from the oil droplet and bubble attachment net; the outlet of the attachment chamber is connected with the inlet of the stirring chamber through a cooling pipe, and a one-way valve is arranged on the cooling pipe, and the outlet of the collection chamber is connected with the inlet end of the one-way valve; a solvent inlet is arranged on the pipe wall of the cooling pipe between the outlet end of the one-way valve and the inlet of the stirring chamber, and the solvent inlet is connected with the solvent pipe; The stirring chamber is provided with a stirring collecting pipe, and the stirring collecting pipe is used to deliver the stirring mixed solution in the stirring chamber into the temporary storage tank; The outlet of the temporary storage tank is connected to the centrifugal separation unit through the oil pump; The centrifugal separation unit is used to separate the edible oil and the low-molecular alcohol solution in the temporary storage tank and to heat and desolventize the separated edible oil.

2. The device for removing harmful substances from edible oil according to claim 1, in, The nozzle has a porous structure, and the diameter of the hole is 0.2-1.0 mm; The outlet of the oil chamber is provided with a gear adjustment device, which is used to adjust the amount of edible oil entering the inlet of the oil droplet bubble regulator, and cooperate with the oil droplet bubble regulator to obtain oil droplets of different diameters.

3. The device for removing harmful substances from edible oil according to claim 1, in, A manhole is provided on the side wall of the attachment chamber; The attachment chamber is also provided with an attachment net regulator, and the attachment net regulator is used to adjust the opening and closing angle of the oil droplet and bubble attachment net.

4. The device for removing harmful substances from edible oil according to claim 1, in, The stirring chamber is also provided with a temperature control tube, a motor and a stirring device; The stirring device is provided with a multi-stage stirring blade head.

5. The device for removing harmful substances from edible oil according to claim 1, in, The centrifugal separation unit includes a centrifuge, a heat exchanger, an evaporation tube array, a desolventizing tower, a low molecular alcohol gasification compressor and a low molecular alcohol gasification storage tank; The outlet of the temporary storage tank is connected to the inlet of the centrifuge through the oil pump; the centrifuge is provided with an edible oil solution outlet and a low molecular alcohol solution outlet; The edible oil solution outlet is connected to the inlet of the desolventizing tower through the cold source inlet and outlet of the heat exchanger; the desolventizing tower is provided with an edible oil product outlet and a solvent outlet; The low molecular alcohol solution outlet is connected to the low molecular alcohol vaporization storage tank through the evaporation tube array and the low molecular alcohol vaporization compressor in sequence.

6. The device for removing harmful substances from edible oil according to claim 5, in, The heat source inlet of the heat exchanger is connected to the water vapor conveying device; the heat source outlet of the heat exchanger is connected to the steam condensate removal device; The solvent outlet is connected to the inlet of the low molecular alcohol gasification compressor; The outlet of the low molecular alcohol gasification storage tank is connected to the inlet of the low molecular alcohol gas feeding pipe.

7. A method for removing harmful substances from edible oil, It is characterized in that The method adopts the device according to any one of claims 1 to 6, comprising the following steps: S1: sending the low molecular alcohol gas pressurized by the low molecular alcohol gas boosting pipe to the oil droplet bubble regulator through a nozzle together with the edible oil containing harmful substances in the oil chamber, obtaining the oil droplet bubble and sending it to the attachment chamber; S2: In the attachment chamber, a portion of the oil droplet bubbles are attached to the oil droplet bubble attachment net and slide down to the collection chamber; the oil droplet bubbles in the attachment chamber that are not attached to the oil droplet bubble attachment net are cooled and sent to the stirring chamber together with the oil droplet mixed liquid and the low molecular alcohol solvent collected in the collection chamber for mixing and stirring to obtain a stirred mixed solution; S3: using a stirring collection pipe to sequentially send the stirred mixed solution into a centrifugal separation unit through a temporary storage tank and an oil pump; using the centrifugal separation unit to separate the edible oil and the low molecular alcohol solution in the stirred mixed solution, and heating and desolventizing the separated edible oil to obtain an edible oil product.

8. The method for removing harmful substances from edible oil according to claim 7, in, In step S1: The pressure of the low molecular alcohol gas after being pressurized by the low molecular alcohol gas booster pipe is 0.3-1.5 MPa; the low molecular alcohol gas is methanol and / or ethanol; The hazardous substance in the hazardous edible oil is at least one of DBP, DEHP, DINP, aflatoxin and zearalenone; The diameter of the oil droplet bubble is 10-30 μm; The method further comprises: when delivering the harmful edible oil in the oil chamber to the oil droplet bubble regulator, adjusting the amount of the harmful edible oil by means of a gear adjustment device, cooperating with the oil droplet bubble regulator to adjust the impact force of the mixed medium, thereby obtaining oil droplet bubbles of different diameters.

9. The method for removing harmful substances from edible oil according to claim 7, in, In step S2: The temperature of the oil droplet bubbles not attached to the oil droplet bubble attachment net in the cooling attachment chamber is 15-35°C; The low molecular alcohol solvent comprises 0.01-0.05% of an additive based on the total weight of the low molecular alcohol solvent, wherein the additive is at least one of an organic acid, an inorganic base and an adsorbent; the amount of the low molecular alcohol solvent added is 0-20% of the mass of the edible oil fed into the stirring chamber; The mixing and stirring is multi-stage stirring, the speed of the mixing and stirring is 5000-20000 r / min, and the temperature of the mixing and stirring is 30-55°C.

10. The method for removing harmful substances from edible oil according to claim 7, in, In step S3: The stirred mixed solution is temporarily stored in the temporary storage tank for 10-20 minutes; In the centrifugal separation unit: the edible oil and the low-molecular alcohol solution in the stirred mixed solution are separated by a centrifuge to obtain an edible oil solution and a low-molecular alcohol solution; the edible oil solution is heated by heat exchange with water vapor and then sent to a desolventizing tower for a first desolventizing treatment to obtain a desolventized low-molecular alcohol solvent and the edible oil product; the low-molecular alcohol solution is separated from the high-boiling point substance by a second desolventizing treatment and then subjected to a gasification and compression treatment together with the desolventized low-molecular alcohol solvent to obtain a low-molecular alcohol gas and sent to a low-molecular alcohol gasification storage tank for standby; Preferably, the temperature of the first desolventizing treatment is 100-120°C; Preferably, the temperature of the second desolventizing treatment is 90-110°C; Preferably, the pressure of the low molecular alcohol gas is 0.2-1.0 MPa.

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