Method and device for extracting oil products in edible oil spent bleaching clay and recycling spent bleaching clay

Abstract

The invention relates to the technical field of solid waste treatment, and discloses a method and device for extracting oil products in edible oil spent bleaching clay and recycling spent bleaching clay, and the method comprises the following steps: step 1, adding oil-containing spent bleaching clay and an extracting agent into a reaction kettle, and extracting solid-liquid layering; step 2, adding the solid-liquid mixture obtained in the step 1 into solid-liquid separation equipment, carrying out primary solid-liquid separation, and leaving the solid-phase carclazyte in the solid-liquid separation equipment; 3, sulfuric acid is added into the solid-liquid separation equipment, the carclazyte is activated, and then solid-liquid separation is conducted again; and step 4, drying the carclazyte by a dryer to obtain the activated carclazyte. According to the scheme, extraction is performed at normal temperature or near normal temperature, energy consumption is low, production efficiency is high, and cost is low; the damage to oil in the raw materials is reduced, so that the structures of the raw materials, namely the spent bleaching clay and the edible oil, can be better maintained; the process is simplified, solid waste carclazyte activation is synchronously carried out, and the solid waste carclazyte recycling process flow is shortened.

Description

Technical Field

[0001] The invention relates to the technical field of solid waste treatment, and in particular to a method and a device for extracting oil from edible oil waste clay and recycling the waste clay. Background Art

[0002] Activated clay is widely used in the refining process of lubricating oil, grease and other products due to its high specific surface area and strong adsorption capacity. For example, clay is often used for decolorization in the processing of grease, but as the adsorption amount increases, the activated clay gradually reaches the saturated adsorption amount and becomes ineffective. On the one hand, the oil content in edible oil waste clay can be as high as 25% to 30%. If it can be recycled and reused, it can bring certain economic benefits to the enterprise. On the other hand, due to the increasingly stringent environmental protection regulations, the resource utilization of clay itself can also improve the utilization efficiency of solid waste resources and reduce the pollution of waste clay to the environment, achieving the effect of killing two birds with one stone.

[0003] The traditional methods of disposing of oil-containing waste clay mainly include direct landfill and incineration followed by landfill. Since the above methods cause serious pollution to the ecological environment, they will be gradually restricted and eliminated. The application number is CN202120361699.X. The document discloses an oil-containing clay treatment and recovery device, which includes a feeding device, a thermal desorption device, a discharging device, a condensing device, a gas treatment device, and a sedimentation separation device. The raw material enters the thermal desorption device through the feeding device for thermal desorption, and the product does not contain oil. The clay enters the discharging device and is stored. The oil and gas enter the condensing equipment, the gas treatment equipment, and the sedimentation separation equipment in turn to be converted into oil and stored. It has the advantages of protecting the environment, recycling materials, and high efficiency. However, the rotary kiln equipment not only occupies a large area, but also consumes a lot of energy. It will also undergo condensation, multi-stage sedimentation and other processes in the future. The operation steps are relatively cumbersome, and the maintenance cost is also high once a problem occurs. Summary of the invention

[0004] The present invention aims to provide a method and device for extracting oil from edible oil waste clay and recycling the waste clay, so as to solve the problems of complicated operation steps and high energy consumption in the current treatment of oil-containing clay.

[0005] To achieve the above object, the present invention provides a method for extracting oil from edible oil waste clay and recycling the waste clay, comprising:

[0006] Step 1: Add the oily waste clay and the extractant in the solvent storage tank into the reactor. After the preset reaction time, the reactor is layered, with the upper layer being the liquid phase and the lower layer being the solid clay phase;

[0007] Step 2: Add the solid-liquid mixture of step 1 to a solid-liquid separation device for preliminary solid-liquid separation, wherein the solid phase clay remains in the solid-liquid separation device and the liquid enters a liquid storage tank;

[0008] Step 3: Add sulfuric acid to the solid-liquid separation equipment to activate the clay, and then perform solid-liquid separation again, the sulfuric acid enters the sulfuric acid storage tank, and the solid-phase clay enters the dryer;

[0009] Step 4: The dryer dries the clay to obtain activated clay.

[0010] Preferably, in step 3, the sulfuric acid is first heated before being added to the solid-liquid separation device. Hot sulfuric acid has a better activation effect on the white clay and a faster activation speed.

[0011] Preferably, in step 2, the liquid separated from the solid and liquid is first filtered and purified before being added to the liquid storage tank. Impurities in the liquid phase are filtered to facilitate subsequent treatment of the liquid and reduce solid impurities in the liquid.

[0012] Preferably, the method further comprises introducing the volatilized gas in step 4 into an incinerator to incinerate the volatile substances carried in the solid phase clay to avoid direct discharge and pollution of the environment.

[0013] Preferably, the method further comprises distilling and separating the liquid separated in step 2 to extract the extractant, condensing the separated extractant and storing it in a solvent recovery tank, and discharging the remaining liquid after distillation into a liquid product tank. The extractant can be reused after separation, which can significantly reduce costs.

[0014] Preferably, the process further includes separating the condensed extractant into gas and liquid, and storing the separated liquid in a solvent recovery tank. The non-condensable gas carried in the recovered solvent is separated to further improve the purity of the recovered solvent, which is convenient for subsequent reuse.

[0015] Preferably, the method further comprises introducing the gas after gas-liquid separation of the condensed extractant into an incinerator, and discharging the non-condensable gas generated in the production process into the incinerator for incineration, so as to avoid direct discharge and environmental pollution.

[0016] Preferably, in step 1, the extractant in the solvent recovery tank is first added to the reactor, and then the extractant in the solvent storage tank is supplemented to the reactor. Reusing the separated extractant can significantly reduce costs, and the solvent storage tank can be used to supplement the extractant lost or damaged during the extraction process.

[0017] Preferably, step 1 further comprises: discharging the supernatant in the reactor into a liquid storage tank. Directly discharging the supernatant in the reactor into the liquid storage tank reduces the amount of material processed by the solid-liquid separation equipment and also speeds up the processing speed and efficiency of the entire device.

[0018] Preferably, the method further includes storing the activated clay in a solid product tank in step 4. The activated clay is collected and stored in the solid product tank to better preserve the activated clay for subsequent use.

[0019] In order to achieve the above-mentioned purpose, the present invention also provides a device for extracting oil products from edible oil waste clay and recycling the waste clay, comprising: an extraction component and a solid-liquid separation component; the extraction component comprises a feeder, a reactor, a solvent storage tank, a dryer, a sulfuric acid storage tank and a heater, the feeder is connected to the feed port of the reactor, the solvent storage tank is connected to the liquid inlet of the reactor, and the solvent storage tank is used to store the extractant for extracting edible oil waste; the solid-liquid separation component comprises a solid-liquid separation device, a solid product tank and a liquid storage tank, the discharge port of the reactor is connected to the solid-liquid separation device, and the solid-liquid separation device is connected to the solid-liquid separation device. The feed port of the equipment is connected, the discharge port of the solid-liquid separation equipment is connected to the liquid storage tank, and the slag discharge port of the solid-liquid separation equipment is connected to the solid product tank; the feed port of the dryer is connected to the slag discharge port of the solid-liquid separation equipment, and the discharge port of the dryer is connected to the solid product tank; the sulfuric acid storage tank, the heater and the solid-liquid separation equipment are connected in sequence, the sulfuric acid outlet of the solid-liquid separation equipment is connected to the sulfuric acid storage tank, the connecting pipeline between the solid-liquid separation equipment and the sulfuric acid storage tank is provided with a second valve, and the connecting pipeline between the discharge port of the solid-liquid separation equipment and the liquid storage tank is provided with a first valve.

[0020] Advantages of this solution: In the extraction process of this application, high-boiling-point, easily pyrolyzed edible oil is extracted at a temperature far below the boiling point of edible oil, which reduces the damage to the oil in the raw material, so that the raw material waste clay and edible oil can better maintain their own structure, avoiding other reactions caused by high temperature conditions, and the extraction is operated at room temperature or close to room temperature, with low energy consumption, high production efficiency and low cost; edible oil can be well dissolved in the extractant, the extraction speed is faster, the efficiency is higher, and the production cycle is shorter; by adding hot sulfuric acid again in the traditional solid-liquid separation process, it is not only beneficial to the absorption and mixing of sulfuric acid by the clay, but also the slow turning and stirring are beneficial to the clay. After sufficient activation, the sulfuric acid and kaolin are separated again into solid and liquid. The sulfuric acid can be recovered and used continuously, and the activated kaolin can be directly reused after subsequent drying treatment, thus avoiding the problem that the recycled kaolin needs additional processes and equipment for treatment and reuse, shortening the process flow of solid waste kaolin recovery and reuse, and also reducing the cost of solid waste kaolin recovery; the extractant can be reused after separation, which can greatly reduce the cost; the problem of complex equipment and large footprint of traditional thermal desorption methods is avoided; the non-condensable steam generated during the extraction process is directly discharged or incinerated to reduce environmental pollution; the recovery and reuse of edible oil and waste kaolin can be realized to the greatest extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1The present invention is a flowchart of the edible oil waste white clay extraction process according to an embodiment of the present invention. DETAILED DESCRIPTION

[0022] The following is further described in detail through specific implementation methods:

[0023] The figure marks in the drawings of the specification include: hopper 1, screw feeder 2, reactor 3, mud pump 4, centrifuge 5, dryer 6, solid product tank 7, liquid storage tank 8, second pump component 9, third pump component 10, fourth pump component 11, filter 12, liquid mixing tank 13, solvent separation tower 14, liquid product tank 15, condenser 16, gas-liquid separation tank 17, solvent recovery tank 18, solvent storage tank 19, incinerator 20, sulfuric acid storage tank 21.

[0024] Example:

[0025] A method for extracting oil from edible oil waste clay and recycling the waste clay, as shown in the following Figure 1 As shown, the following steps are included:

[0026] Step 11: Add the edible oil-containing waste clay from the hopper 1 to the continuously stirred reactor 3 via the running feeder at room temperature.

[0027] Step 12: Add the extractant in the solvent storage tank 19 to two-thirds of the volume of the reactor 3 at a set speed and then stop. Continue stirring the reaction for 30 minutes and then stop. Let the layers stand still and the upper layer is the liquid phase and the lower layer is the solid white clay.

[0028] In this step, the extractant in the solvent recovery tank 18 is first added to the reactor 3, and then the extractant in the solvent storage tank 19 is supplemented and added to the reactor 3. The separated extractant is reused, which can greatly reduce the cost, and the solvent storage tank 19 can be used to replenish the extractant lost and damaged during the extraction process. In this embodiment, the extractant is dichloromethane.

[0029] Step 13: Discharge the supernatant in the reaction kettle 3 into the liquid storage tank 8.

[0030] The supernatant in the reaction kettle 3 is directly discharged into the liquid storage tank 8, which reduces the amount of material to be processed by the solid-liquid separation equipment and also speeds up the processing speed and efficiency of the entire device.

[0031] Step 2: Add the solid-liquid mixture of step 1 to the solid-liquid separation equipment for preliminary solid-liquid separation, and the solid phase white clay remains in the solid-liquid separation equipment; the liquid enters the liquid storage tank 8.

[0032] In this step, the liquid after solid-liquid separation is first filtered and purified, and then added to the liquid storage tank 8. Impurities in the liquid phase are filtered to facilitate subsequent treatment of the liquid and reduce solid impurities in the liquid. Specifically, the liquid after solid-liquid separation is filtered and purified by the filter 12.

[0033] It also includes distilling and separating the liquid separated in step 2 to extract the extractant, and condensing the separated extractant and storing it in the solvent recovery tank 18, and discharging the remaining liquid into the liquid product tank 15. The extractant can be reused after separation, which can greatly reduce costs. Specifically, the solvent and the remaining liquid are separated by a distillation tower, and the dichloromethane and edible oil are separated by distillation at 82°C. The dichloromethane is condensed and reused, and the edible oil is collected for standby or deep processing. The edible oil collected here is used to make biodiesel and can no longer be used for food cooking and modulation.

[0034] The process also includes gas-liquid separation of the condensed extractant, and storing the separated liquid in a solvent recovery tank 18. The non-condensable gas carried in the recovered solvent is separated to further improve the purity of the recovered solvent, which is convenient for subsequent reuse. Specifically, the gas-liquid separation tank 17 is used to separate and purify the solvent.

[0035] The process also includes introducing the gas after gas-liquid separation of the condensed extractant into the incinerator 20. The non-condensable gas generated during the production process is discharged to the incinerator 20 for incineration to avoid direct discharge and environmental pollution.

[0036] Step 3: Add sulfuric acid to the solid-liquid separation equipment to activate the clay, and then perform solid-liquid separation again. The sulfuric acid enters the sulfuric acid storage tank 21, and the solid-phase clay enters the dryer 6.

[0037] After the first solid-liquid separation, the solid-liquid separation equipment is continued to be used to mix and separate the waste clay and sulfuric acid, thereby activating the clay. The clay is directly reused after the second separation and drying treatment, avoiding the subsequent use of additional processes and equipment to activate the clay, shortening the process of solid waste clay recovery and reuse, and also reducing the cost of solid waste clay recovery.

[0038] In this step, the sulfuric acid is first heated and then added to the solid-liquid separation equipment. Hot sulfuric acid has a better activation effect on the white clay and a faster activation speed.

[0039] In this step, a centrifuge 5 is used for solid-liquid separation. During the process of adding hot sulfuric acid to activate the solid waste clay, the centrifuge 5 first rotates slowly to allow the sulfuric acid and the solid waste clay to fully contact, and then rotates quickly to separate the sulfuric acid and the solid waste clay.

[0040] Step 4: The dryer 6 dries the clay to obtain activated clay.

[0041] In this step, the solid waste is removed by drying the clay to remove a small amount of residual extractant and sulfuric acid. The dried clay can be directly used, avoiding the need for additional treatment of the clay for reuse.

[0042] The process also includes introducing the volatilized gas (mainly composed of extractant and sulfuric acid) from the dryer 6 into the incinerator 20. The volatile substances carried in the solid clay are incinerated to avoid direct discharge and environmental pollution.

[0043] The method further includes storing the activated clay in step 4 in a solid product tank 7. The activated clay is collected and stored in the solid product tank 7 to better preserve the activated clay for subsequent use.

[0044] The process flow of this invention first extracts edible oil from waste clay by a stirred kettle, and then separates the extraction solvent from the oil product through a series of operations such as filtration, separation, drying, and condensation. The extraction solvent can be reused, and the separated edible oil can also be further processed to obtain biodiesel. After the clay is subsequently dried, the extractant evaporates quickly, and the obtained clay can be directly reused, avoiding the need for traditional clay to be processed and reused by another system equipment, shortening the process flow of solid waste clay recycling and reuse, and also reducing the cost of solid waste clay recycling. This method realizes the resource problem of solid hazardous waste of edible oil waste clay and the separation of liquid product edible oil. Reuse; during the extraction process, high-boiling-point, easily pyrolyzed edible oil is extracted at a temperature far below the boiling point of edible oil, which reduces the damage to the oil in the raw materials, so that the raw materials, waste clay and edible oil, can better maintain their own structure, and avoid other reactions caused by high temperature conditions. At the same time, the extraction is carried out at room temperature or near room temperature, with low energy consumption, high production efficiency and low cost; edible oil can be well dissolved in the extraction agent, the extraction speed is faster, the efficiency is higher, and the production cycle is shorter; the problems of complex equipment and large floor space of traditional thermal desorption methods are avoided; the non-condensable steam generated during the extraction process is directly discharged or incinerated to reduce environmental pollution.

[0045] This solution also provides a device for extracting oil from edible oil waste clay and recycling waste clay for implementing the above method, such as the attached Figure 1 As shown, it includes: an extraction component, a solid-liquid separation component, a liquid filtration component, a liquid separation component and a solvent purification component.

[0046] The extraction assembly includes a hopper 1, a feeder, a reactor 3 and a solvent storage tank 19. The feeder is specifically a screw feeder 2, which can continuously and evenly convey materials, and can adjust the conveying speed as needed to adapt to different material flow requirements, so as to facilitate the control of the amount of material added.

[0047] The feeder is connected to the feed port of the reactor 3, and the feed port of the reactor 3 is located at the top of the reactor 3. The solvent storage tank 19 is connected to the liquid inlet of the reactor 3, and the liquid inlet of the reactor 3 is also located at the top of the reactor 3.

[0048] The solvent storage tank 19 is used to store the extractant for extracting edible oil waste. In this solution, the extractant is dichloromethane. Dichloromethane has a strong solubility for a variety of organic compounds and can effectively extract the target compound. The boiling point of dichloromethane is about 39.6°C and it is easy to remove by evaporation, which is convenient for subsequent processing and purification of the target compound.

[0049] The reactor 3 is provided with a stirring reactor, through which the waste clay containing edible oil and the extractant in the reactor 3 are stirred to accelerate the solvent extraction of edible oil. In this scheme, the waste clay containing edible oil is added from the hopper 1 to the continuously stirred reactor 3 through the running feeder at room temperature, and at the same time, the dichloromethane in the solvent storage tank 19 is injected into the reactor 3 at two-thirds of the volume at a certain speed and then stopped. The reaction is continued to stir for 30 minutes and then stopped, and the layers are statically separated, with the upper layer being the liquid phase and the lower layer being the solid phase clay.

[0050] The solid-liquid separation component includes a solid-liquid separation device, a solid product tank 7 and a liquid storage tank 8. The discharge port of the reactor 3 is connected to the feed port of the solid-liquid separation device, the liquid discharge port of the solid-liquid separation device is connected to the liquid storage tank 8, and the slag discharge port of the solid-liquid separation device is connected to the solid product tank 7. In this solution, the solid-liquid separation device is a centrifuge 5 or a filter press. It also includes a first pump component, which is connected to the reactor 3 and the solid-liquid separation device. In this embodiment, the first pump component is a mud pump 4, which is convenient for extracting the solid-liquid mixture into the centrifuge 5 or the filter press.

[0051] The supernatant liquid discharge port of the reactor 3 is connected to the liquid storage tank 8. The supernatant liquid in the reactor 3 is directly discharged into the liquid storage tank 8, which reduces the amount of material processed by the solid-liquid separation equipment and also speeds up the processing speed and efficiency of the entire device.

[0052] It also includes a dryer 6, the feed port of the dryer 6 is connected to the slag discharge port of the solid-liquid separation device, and the discharge port of the dryer 6 is connected to the solid product tank 7. The solid phase white clay is dried by the dryer 6 and then processed, which is more convenient for storage.

[0053] The dryer 6 also includes an incinerator 20, and the exhaust port of the dryer 6 is connected to the incinerator 20. The volatile substances carried in the solid clay are incinerated to avoid direct discharge and pollution of the environment.

[0054] The liquid filtering assembly includes a second pump 9, a filter 12 and a liquid mixing tank 13. The second pump 9 is connected to the liquid storage tank 8, the second pump 9 is connected to the filter 12, and the discharge port of the filter 12 is connected to the liquid mixing tank 13. The impurities in the liquid phase are filtered through the filter 12 to facilitate the subsequent treatment of the liquid and reduce the solid impurities in the liquid. Among them, the second pump 9 is a centrifugal pump.

[0055] The filter 10 also includes a third pump 10, which is connected to the filter 12 and is used to transport the liquid filtered by the filter 12 to the liquid separation component. The second pump 9 and the third pump 10 cooperate to maintain a stable pressure inside the filter, ensure the smooth filtering process, and prevent poor filtering effect caused by pressure fluctuations. The third pump 10 is a centrifugal pump.

[0056] Liquid separation component, the liquid separation component includes a fourth pump 11, a solvent separation tower 14, a condenser 16, a solvent recovery tank 18 and a liquid product tank 15, the third pump 10 is connected to the liquid mixing tank 13, the fourth pump 11 is connected to the liquid mixing tank 13, the fourth pump 11 is connected to the solvent separation tower 14, the discharge port of the solvent separation tower 14 is connected to the liquid product tank 15, the exhaust port of the solvent separation tower 14 is connected to the condenser 16, and the discharge port of the condenser 16 is connected to the solvent recovery tank 18. In this scheme, the solvent separation tower 14 is a distillation tower. After the solid phase liquid enters the solvent separation tower 14, the solvent (mainly refers to the extractant dichloromethane) and the remaining liquid are separated. The solvent separation tower 14 separates the liquid by distillation. The solvent changes from liquid to gas and enters the condenser 16 for condensation. After condensation, it enters the solvent recovery tank 18 for storage and utilization, such as re-entering the entire system for recycling. The remaining liquid is directly discharged into the liquid product tank 15. Among them, the fourth pump 11 is a centrifugal pump.

[0057] It also includes a solvent purification component, which includes a gas-liquid separation tank 17, which is connected to the condenser 16, and the discharge port of the gas-liquid separation tank 17 is connected to the solvent recovery tank 18. The gas-liquid separation tank 17 is used to separate the non-condensable gas carried in the recovered solvent, further improve the purity of the recovered solvent, and facilitate subsequent reuse. Among them, the exhaust port of the gas-liquid separation tank 17 is connected to the incinerator 20. The non-condensable gas generated in the production process is discharged to the incinerator 20 for incineration to avoid direct emptying and pollution of the environment.

[0058] The solvent recovery tank 18 is connected to the solvent storage tank 19, and the processed and recovered extraction solvent is added to the solvent storage tank 19 for subsequent extraction and reuse. In the whole process, it is inevitable that a part of the extraction solvent will be lost. The extraction solvent is supplemented through the solvent storage tank 19 to ensure the normal operation of the whole system.

[0059] It also includes a sulfuric acid storage tank 21 and a heater. The sulfuric acid storage tank 21, the heater and the solid-liquid separation equipment are connected in sequence. The sulfuric acid outlet of the solid-liquid separation equipment is connected to the sulfuric acid storage tank 21. A second valve is provided on the connecting pipeline between the solid-liquid separation equipment and the sulfuric acid storage tank 21. A second valve is provided on the connecting pipeline between the discharge port of the solid-liquid separation equipment and the liquid storage tank 8. After the solid-liquid separation equipment performs solid-liquid separation, hot sulfuric acid is added to activate the kaolin, and then the sulfuric acid and kaolin are separated again by solid-liquid separation. The kaolin can be directly reused after subsequent drying treatment, avoiding the need for traditional kaolin to be processed and reused by other system equipment, shortening the process flow of solid waste kaolin recycling and reuse. Among them, the solid-liquid separation equipment is rotated slowly at the beginning of adding sulfuric acid, so that the solid waste kaolin and sulfuric acid are fully contacted and the kaolin is activated as much as possible; then the solid-liquid separation equipment is rotated quickly to separate the sulfuric acid and kaolin.

[0060] Other similar reagents, and the selection of similar reaction parameters, those skilled in the art can determine the above-mentioned only embodiments of the present invention according to common knowledge, and the common knowledge such as the known specific structure, characteristics and reactant ratio in the scheme is not described too much here. It should be pointed out that for those skilled in the art, without departing from the concept of the present invention, several deformations and improvements can also be made, such as simply adjusting the selection of parameters within or near the specified parameter range, which should also be regarded as the protection scope of the present invention, which will not affect the effect of the implementation of the present invention and the practicality of the patent. The protection scope required by this application shall be based on the content of its claims, and the specific implementation methods in the specification and other records can be used to explain the content of the claims.

Claims

1. A method for extracting oil from edible oil waste clay and recycling the waste clay, characterized in that: include: Step 1: Add the oily waste clay and the extractant in the solvent storage tank into the reactor. After the preset reaction time, the reactor is layered, with the upper layer being the liquid phase and the lower layer being the solid clay phase; Step 2: Add the solid-liquid mixture of step 1 to a solid-liquid separation device for preliminary solid-liquid separation, wherein the solid phase clay remains in the solid-liquid separation device and the liquid enters a liquid storage tank; Step 3: Add sulfuric acid to the solid-liquid separation equipment to activate the clay, and then perform solid-liquid separation again, the sulfuric acid enters the sulfuric acid storage tank, and the solid-phase clay enters the dryer; Step 4: The dryer dries the clay to obtain activated clay.

2. The method for extracting oil from edible oil waste clay and recycling waste clay according to claim 1, characterized in that: In step 3, the sulfuric acid is first heated and then added to the solid-liquid separation equipment.

3. The method for extracting oil from edible oil waste clay and recycling waste clay according to claim 1, characterized in that: In step 2, the solid-liquid separated liquid is first filtered and purified, and then added to the liquid storage tank.

4. The method for extracting oil from edible oil waste clay and recycling waste clay according to claim 1, characterized in that: The method also includes introducing the volatilized gas in step 4 into an incinerator.

5. The method for extracting oil from edible oil waste clay and recycling waste clay according to claim 1, characterized in that: The process also includes distilling and separating the liquid separated in step 2 to extract the extractant, condensing the separated extractant and storing it in a solvent recovery tank, and discharging the remaining liquid from the distillation into a liquid product tank.

6. The method for extracting oil from edible oil waste clay and recycling waste clay according to claim 5, characterized in that: The method also includes separating the gas and liquid of the condensed extractant, and storing the separated liquid in a solvent recovery tank.

7. The method for extracting oil from edible oil waste clay and recycling waste clay according to claim 6, characterized in that: The method also includes introducing the gas obtained by gas-liquid separation of the condensed extractant into the incinerator.

8. The method for extracting oil from edible oil waste clay and recycling waste clay according to claim 6, characterized in that: In the step 1, the extractant in the solvent recovery tank is first added to the reactor, and then the extractant in the solvent storage tank is supplementally added to the reactor.

9. The method for extracting oil from edible oil waste clay and recycling waste clay according to claim 1, characterized in that: The step 1 also includes: discharging the supernatant in the reaction kettle into a liquid storage tank.

10. A device for extracting oil from edible oil waste clay and recycling the waste clay, characterized by: include: An extraction component and a solid-liquid separation component; the extraction component includes a feeder, a reactor, a solvent storage tank, a dryer, a sulfuric acid storage tank and a heater, the feeder is connected to the feed port of the reactor, the solvent storage tank is connected to the liquid inlet of the reactor, and the solvent storage tank is used to store the extractant for extracting edible oil waste; the solid-liquid separation component includes solid-liquid separation equipment, a solid product tank and a liquid storage tank, the discharge port of the reactor is connected to the feed port of the solid-liquid separation equipment, the liquid discharge port of the solid-liquid separation equipment is connected to the liquid storage tank, and the slag discharge port of the solid-liquid separation equipment is connected to the solid product tank; the feed port of the dryer is connected to the slag discharge port of the solid-liquid separation equipment, and the discharge port of the dryer is connected to the solid product tank; the sulfuric acid storage tank, the heater and the solid-liquid separation equipment are connected in sequence, the sulfuric acid outlet of the solid-liquid separation equipment is connected to the sulfuric acid storage tank, the connecting pipeline between the solid-liquid separation equipment and the sulfuric acid storage tank is provided with a second valve, and the connecting pipeline between the liquid discharge port of the solid-liquid separation equipment and the liquid storage tank is provided with a first valve.

Images