Device for extracting oil products in edible oil spent bleaching clay and recycling spent bleaching clay

Abstract

The utility model relates to the technical field of solid waste treatment, and discloses a device for extracting oil in edible oil spent bleaching clay and recycling spent bleaching clay, which comprises an extraction component and a solid-liquid separation component, the extraction assembly comprises a feeder, a reaction kettle and a solvent storage tank, the feeder is communicated with a feed port of the reaction kettle, the solvent storage tank is communicated with a liquid inlet of the reaction kettle, and the solvent storage tank is used for storing an extraction agent for extracting edible oil; the solid-liquid separation assembly comprises solid-liquid separation equipment, a solid product tank and a liquid storage tank, a discharge port of the reaction kettle is communicated with a feed port of the solid-liquid separation equipment, a liquid discharge port of the solid-liquid separation equipment is communicated with the liquid storage tank, and a slag discharge port of the solid-liquid separation equipment is communicated with the solid product tank. The extraction is performed at normal temperature or near normal temperature, the energy consumption is low, the production efficiency is high, and the cost is low; the extraction agent can be repeatedly used after being separated, so that the cost can be greatly reduced; and the problems of complex equipment and large occupied area of the traditional thermal desorption method are avoided.

Description

Technical Field

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

[0002] Due to its high surface area and strong adsorption capacity, activated clay is widely used in the refining of lubricants, greases, and other products. For example, clay is often used for decolorization during oil processing. However, as the adsorption capacity increases, the activated clay gradually reaches saturation and becomes ineffective. On the one hand, the oil content of edible oil waste clay can be as high as 25% to 30%. Recycling and reuse of this waste clay can bring significant economic benefits to businesses. On the other hand, due to increasingly stringent environmental regulations, the resource utilization of clay itself can improve the utilization efficiency of solid waste resources and reduce environmental pollution, achieving a two-pronged effect.

[0003] Traditional methods for disposing of oily waste clay primarily include direct landfill and incineration followed by landfill. Due to their significant environmental pollution, these methods will be gradually restricted and phased out. Currently, thermal desorption is the primary method used to treat oily solid waste clay. This involves pretreatment to remove large impurities; loading the pretreated clay into a thermal desorption device and heating it to a set temperature, typically between 300-600°C; maintaining the set temperature for a specified period of time to allow oil molecules to desorb from the solid surface, allowing the desorbed oil and gas to be carried away by gas flow through the reactor; cooling the desorbed oil and gas to condense them into a liquid, separating the oil-water mixture, recovering usable oil, and treating the waste gas; safely disposing of or reusing the remaining clay; and testing the desorption effect to ensure that the treatment meets environmental standards. Thermal desorption also requires a large footprint and requires heating the temperature to several hundred degrees, requiring significant energy and resulting in relatively high operating costs. Utility Model Content

[0004] The utility model aims to provide a device for extracting oil from edible oil waste clay and recycling the waste clay, so as to solve the problems of large floor space and high energy consumption of traditional oil-containing waste clay treatment devices.

[0005] In order to achieve the above object, the utility model discloses the following technical scheme: a kind of extraction and waste clay resource of edible oil waste clay oil product, comprising: extraction component and solid-liquid separation component;The extraction component includes feeder, reaction kettle, solvent storage tank, the feeder is communicated with the feed inlet of reaction kettle, the liquid inlet of the solvent storage tank is communicated with reaction kettle, and the solvent storage tank is used to store the extractant of edible oil extraction;The solid-liquid separation component includes solid-liquid separation equipment, solid product tank and liquid storage tank, the discharge port of the reaction kettle is communicated with solid-liquid separation equipment feed inlet, the liquid outlet of the solid-liquid separation equipment is communicated with liquid storage tank, and the residue outlet of the solid-liquid separation equipment is communicated with solid product tank.

[0006] The principle of the present application is as follows: the waste clay containing edible oil is added to the reaction kettle through the feeder, and the extractant in the solvent storage tank is also added to the reaction kettle, which extracts the edible oil from the waste clay. After a predetermined reaction time, the reaction kettle is layered, with liquid phase on the top and solid phase clay on the bottom. Then, the solid-liquid mixture is added to the solid-liquid separation equipment for solid-liquid separation. The solid phase clay is collected in the solid product tank, and the liquid is collected in the liquid storage tank. The edible oil and waste clay can be further processed and utilized.

[0007] The present application has the following advantages: the high-boiling, easily pyrolyzed edible oil is extracted at a temperature much lower than the boiling point of the edible oil, which reduces the damage to the raw material and allows the raw material waste clay and edible oil to maintain their original structure. The edible oil can be well dissolved in the extractant, and the extraction process is fast, efficient, and has a short production cycle. The extraction process operates at room temperature or near room temperature, which is energy-efficient, cost-effective, and has high production efficiency. The extractant can be reused after separation, which can significantly reduce costs. The traditional thermal desorption method avoids the problems of complex equipment and large occupied area.

[0008] Preferably, a dryer is also included, with the feed inlet of the dryer being communicated with the residue outlet of the solid-liquid separation equipment, and the discharge port of the dryer being communicated with the solid product tank. The solid phase clay is dried by the dryer before further processing, which makes storage more convenient.

[0009] Preferably, an incinerator is also included, with the exhaust port of the dryer being communicated with the incinerator. The volatile substances carried by the solid phase clay are incinerated to avoid direct emptying and environmental pollution.

[0010] Preferably, the filter further includes a liquid filtration assembly comprising a second pump, a filter, a third pump, and a liquid mixing tank, all connected in sequence. The second pump is connected to the liquid storage tank. The filter filters impurities from the liquid phase, facilitating subsequent processing of the liquid and reducing solid impurities in the liquid. The second and third pumps work together to maintain a stable pressure within the filter, ensuring a smooth filtration process and preventing poor filtration results due to pressure fluctuations.

[0011] Preferably, the liquid separation assembly comprises a liquid product tank, and a fourth pump, a solvent separation tower, a condenser, and a solvent recovery tank connected in sequence. The fourth pump is connected to the liquid mixing tank, and the discharge port of the solvent separation tower is connected to the liquid product tank. After the solid phase liquid enters the solvent separation tower, the solvent (mainly the extractant) and the remaining liquid are separated. The solvent separation tower separates the liquid by distillation. The solvent changes from liquid to gas and enters the condenser for condensation. After condensation, it enters the solvent recovery tank for storage and utilization. The remaining liquid is directly discharged into the liquid product tank.

[0012] Preferably, the system further comprises a solvent purification assembly, comprising a gas-liquid separator tank, the gas-liquid separator tank being connected to the condenser, and the discharge port of the gas-liquid separator tank being connected to the solvent recovery tank. The gas-liquid separator tank is used to separate non-condensable gases carried in the recovered solvent, thereby further improving the purity of the recovered solvent and facilitating subsequent reuse.

[0013] Preferably, an incinerator is further included, and the exhaust port of the gas-liquid separation tank is connected to the incinerator. The non-condensable gas generated during the production process is discharged to the incinerator for incineration to avoid direct discharge and pollution of the environment.

[0014] Preferably, it further comprises a first pump component, wherein the first pump component is connected to the reaction kettle, and the first pump component is connected to the solid-liquid separation equipment.

[0015] Preferably, the method further comprises a sulfuric acid storage tank and a heater, wherein the sulfuric acid storage tank, the heater and the solid-liquid separation device are connected in sequence, the sulfuric acid outlet of the solid-liquid separation device is connected to the sulfuric acid storage tank, a second valve is provided on the connecting pipe between the solid-liquid separation device and the sulfuric acid storage tank, and a first valve is provided on the connecting pipe between the discharge port of the solid-liquid separation device and the liquid storage tank. After the solid-liquid separation device performs solid-liquid separation, hot sulfuric acid is added to activate the clay, and then the sulfuric acid and clay are separated again by solid-liquid separation. The activated clay can be directly reused after subsequent drying treatment, thereby avoiding the problem that traditional clay needs to use additional processes and equipment for activation treatment before reuse, and shortening the process flow of solid waste clay recovery and reuse.

[0016] Preferably, the supernatant outlet of the reaction kettle is communicated with the liquid storage tank. The supernatant in the reaction kettle is directly discharged into the liquid storage tank, which reduces the amount of material treated by the solid-liquid separation equipment and also speeds up the processing speed and efficiency of the entire device. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 The structure of the embodiment of the utility model is shown in the schematic diagram. DETAILED DESCRIPTION

[0018] The following is further described in detail through specific embodiments:

[0019] The reference signs in the drawings of the specification include: hopper 1, screw feeder 2, reaction kettle 3, mud pump 4, centrifuge 5, dryer 6, solid product tank 7, liquid storage tank 8, second pump 9, third pump 10, fourth pump 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.

[0020] Embodiment:

[0021] The device for extracting oil products from waste white clay of edible oil and recycling waste white clay resources comprises an extraction assembly, a solid-liquid separation assembly, a liquid filtration assembly, a liquid separation assembly and a solvent purification assembly.

[0022] The extraction assembly comprises a hopper 1, a feeder, a reaction kettle 3 and a solvent storage tank 19. The feeder is specifically a screw feeder 2, which can continuously and uniformly convey materials and can adjust the conveying speed according to the needs to adapt to different material flow requirements and facilitate control of the amount of material added.

[0023] The feeder is communicated with the feed inlet of the reaction kettle 3, and the feed inlet of the reaction kettle 3 is located at the top of the reaction kettle 3. The solvent storage tank 19 is communicated with the liquid inlet of the reaction kettle 3, and the liquid inlet of the reaction kettle 3 is also located at the top of the reaction kettle 3.

[0024] The solvent storage tank 19 is used for storing the extractant for extracting waste edible oil. In the present scheme, the extractant is dichloromethane, which has strong solubility for various organic compounds and can effectively extract target compounds. The boiling point of dichloromethane is about 39.6℃, which can be easily removed by evaporation, facilitating subsequent processing and purification of target compounds.

[0025] The reaction kettle 3 is provided with a stirring reactor, which stirs the waste clay containing edible oil and the extracting agent in the reaction kettle 3, so as to accelerate the speed of extracting edible oil by the solvent. In the scheme, the waste clay containing edible oil is added into the continuously stirred reaction kettle 3 from the hopper 1 at room temperature, and the dichloromethane in the solvent storage tank 19 is injected into the reaction kettle 3 at a certain speed and stopped at two-thirds of the volume of the reaction kettle 3, and the reaction continues to stir for 30 min and then stops, and the upper layer is liquid phase and the lower layer is solid phase clay.

[0026] The solid-liquid separation assembly comprises a solid-liquid separation device, a solid product tank 7 and a liquid storage tank 8. The discharge port of the reaction kettle 3 is communicated with the feed port of the solid-liquid separation device, the liquid discharge port of the solid-liquid separation device is communicated with the liquid storage tank 8, and the residue discharge port of the solid-liquid separation device is communicated with the solid product tank 7. In the scheme, the solid-liquid separation device is a centrifuge 5 or a filter press. The first pump is communicated with the reaction kettle 3 and the solid-liquid separation device. In the embodiment, the first pump is a slurry pump 4, which is convenient for extracting the solid-liquid mixture into the centrifuge 5 or the filter press.

[0027] The supernatant discharge port of the reaction kettle 3 is communicated with the liquid storage tank 8. The supernatant in the reaction kettle 3 is directly discharged into the liquid storage tank 8, which reduces the amount of material processed by the solid-liquid separation device and accelerates the processing speed and efficiency of the whole device.

[0028] The device further comprises a dryer 6, the feed port of the dryer 6 is communicated with the residue discharge port of the solid-liquid separation device, and the discharge port of the dryer 6 is communicated with the solid product tank 7. The solid phase clay is dried by the dryer 6, and then treated and stored more conveniently.

[0029] The device further comprises a incinerator 20, and the exhaust port of the dryer 6 is communicated with the incinerator 20. The volatile substances carried in the solid phase clay are incinerated to avoid direct emptying and polluting the environment.

[0030] The liquid filtering assembly comprises a second pump 9, a filter 12 and a liquid mixing tank 13. The second pump 9 is communicated with the liquid storage tank 8 and the filter 12. The liquid discharge port of the filter 12 is communicated with the liquid mixing tank 13. The impurities in the liquid phase are filtered by the filter 12, so as to facilitate the subsequent treatment of the liquid and reduce the solid impurities in the liquid. The second pump 9 is a centrifugal pump.

[0031] The device further comprises a third pump 10, which is communicated with the filter 12 and is used for conveying the liquid filtered by the filter 12 to the liquid separation assembly. The second pump 9 and the third pump 10 cooperate to maintain the stable pressure in the filter, ensure the smooth progress of the filtering process, and prevent poor filtering effect caused by pressure fluctuation. The third pump 10 is a centrifugal pump.

[0032] The liquid separation component includes a fourth pump part 11, a solvent separation tower 14, a condenser 16, a solvent recovery tank 18 and a liquid product tank 15. The third pump part 10 is connected to the liquid mixing tank 13, the fourth pump part 11 is connected to the liquid mixing tank 13, the fourth pump part 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 solution, the solvent separation tower 14 is a distillation tower. After the solid liquid enters the solvent separation tower 14, the solvent (mainly 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, for example, it re-enters the entire system for recycling. The remaining liquid is directly discharged into the liquid product tank 15. Here, the remaining liquid is edible oil. The edible oil collected here is used to make biodiesel and cannot be used for food cooking and modulation. Among them, the fourth pump component 11 is a centrifugal pump.

[0033] The system also includes a solvent purification assembly, comprising a gas-liquid separator 17, which is connected to a condenser 16. The discharge port of the separator 17 is connected to a solvent recovery tank 18. The separator 17 separates non-condensable gases from the recovered solvent, further improving the purity of the recovered solvent and facilitating subsequent reuse. The exhaust port of the separator 17 is connected to an incinerator 20. Non-condensable gases generated during the production process are discharged to the incinerator 20 for incineration, preventing direct discharge and environmental pollution.

[0034] Solvent recovery tank 18 is connected to solvent storage tank 19, where the recovered extraction solvent is added to the solvent storage tank 19 for reuse in subsequent extractions. Loss of extraction solvent is inevitable during the entire process, and the solvent storage tank 19 replenishes the extraction solvent to ensure the normal operation of the entire system.

[0035] Also included are a sulfuric acid storage tank 21 and a heater, which are sequentially connected to a solid-liquid separation device, the sulfuric acid outlet of the solid-liquid separation device is connected to the sulfuric acid storage tank 21, a second valve is arranged on the connecting pipeline of the solid-liquid separation device and the sulfuric acid storage tank 21, and a second valve is arranged on the connecting pipeline of the liquid outlet of the solid-liquid separation device and the liquid storage tank 8. After the solid-liquid separation of the solid-liquid separation device, hot sulfuric acid is added to activate the solid waste clay, and then the sulfuric acid and the clay are separated again, and the clay is directly obtained after subsequent drying treatment to obtain activated clay, which greatly shortens the solid waste clay recycling process. In the initial stage of adding sulfuric acid, the solid-liquid separation device is slowly rotated first, so that the clay and the sulfuric acid are in full contact, and the clay is activated as much as possible; then the solid-liquid separation device is quickly rotated, so that the sulfuric acid and the solid-phase clay are separated.

[0036] The specific implementation process is as follows:

[0037] The waste clay containing edible oil is added to the reaction kettle 3 from the hopper 1 at room temperature, and the stirring reactor in the reaction kettle 3 is started, and the dichloromethane in the solvent storage tank 19 is injected into the reaction kettle 3 at a certain speed to stop at two-thirds of the volume, the dichloromethane extracts the edible oil, the reaction continues to stir for 30 min and then stops, and the upper layer is liquid phase and the lower layer is solid-phase clay.

[0038] Then the solid-liquid mixture is pumped to the centrifuge 5 through the slurry pump 4 for solid-liquid separation, the solid is dried in the dryer 6 and stored in the solid product tank 7 for treatment and reuse; the liquid is pumped into the liquid storage tank 8 and then filtered into the liquid mixing tank 13.

[0039] Then the liquid in the liquid mixing tank 13 is pumped into the rectification tower by the centrifugal pump, and then the dichloromethane and the edible oil are separated by 82℃ rectification, the dichloromethane is stored in the solvent recovery tank 18 after being separated from the incondensable gas through the gas-liquid separation tank 17, and the edible oil is stored in the liquid product tank 15 for use or deep processing. The incondensable gas generated in the process is directly emptied or incinerated. Thus, the recycling and reuse of edible oil and waste clay are maximized.

[0040] This extraction process extracts high-boiling-point, easily pyrolyzed edible oil at a temperature far below the boiling point of edible oil, minimizing damage to the raw material oil, allowing the waste clay and edible oil to better maintain their structures and avoiding other reactions caused by high-temperature conditions. The resulting edible oil is well soluble in the extractant, resulting in faster extraction, higher efficiency, and a shorter production cycle. The extractant and the raw material generally exhibit different properties, such as solid-liquid and gas-liquid phase separation, which not only increases extraction efficiency but also typically operates at or near room temperature, resulting in low energy consumption, improved production efficiency, and reduced costs. The extractant can be reused after simple separation, significantly reducing costs. This maximizes the recovery and reuse of edible oil and waste clay, and avoids the complex equipment and large footprint of traditional thermal desorption methods.

[0041] The above is only an embodiment of the present invention. Common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described here in detail, such as the pumps and valves required for different pipelines. It should be pointed out that for those skilled in the art, several variations and improvements can be made without departing from the technical solution of the present invention. In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. The scope of protection claimed in this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A device for extracting oil from edible oil waste clay and recycling the waste clay, characterized in that: include: An extraction component and a solid-liquid separation component; the extraction component includes a feeder, a reactor, and a solvent storage tank, 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 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.

2. The device for extracting oil from edible oil waste clay and recycling the waste clay according to claim 1, characterized in that: It also includes a dryer, 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.

3. The device for extracting oil from edible oil waste clay and recycling the waste clay according to claim 2, characterized in that: An incinerator is also included, and the exhaust port of the dryer is communicated with the incinerator.

4. The device for extracting oil from edible oil waste clay and recycling the waste clay according to claim 1, characterized in that: It also includes a liquid filter assembly, which includes a second pump component, a filter, a third pump component and a liquid mixing tank that are connected in sequence, and the second pump component is connected to the liquid storage tank.

5. The device for extracting oil from edible oil waste clay and recycling the waste clay according to claim 4, characterized in that: It also includes a liquid separation component, which includes a liquid product tank, and a fourth pump component, a solvent separation tower, a condenser and a solvent recovery tank connected in sequence. The fourth pump component is connected to the liquid mixing tank, and the discharge port of the solvent separation tower is connected to the liquid product tank.

6. The device for extracting oil from edible oil waste clay and recycling the waste clay according to claim 5, characterized in that: It also includes a solvent purification component, which includes a gas-liquid separation tank, the gas-liquid separation tank is connected to the condenser, and the discharge port of the gas-liquid separation tank is connected to the solvent recovery tank.

7. The device for extracting oil from edible oil waste clay and recycling the waste clay according to claim 6, characterized in that: It also includes an incinerator, and the exhaust port of the gas-liquid separation tank is connected to the incinerator.

8. The device for extracting oil from edible oil waste clay and recycling the waste clay according to claim 1, characterized in that: It also includes a first pump component, which is connected to the reaction kettle and the solid-liquid separation equipment.

9. The device for extracting oil from edible oil waste clay and recycling the waste clay according to claim 2, characterized in that: It also includes a sulfuric acid storage tank and a heater. 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. A second valve is provided on the connecting pipeline between the solid-liquid separation equipment and the sulfuric acid storage tank. A first valve is provided on the connecting pipeline between the discharge port of the solid-liquid separation equipment and the liquid storage tank.

10. The device for extracting oil from edible oil waste clay and recycling the waste clay according to claim 1, characterized in that: The supernatant liquid discharge port of the reactor is communicated with the liquid storage tank.

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