CN111019752A - Method and device for regenerating and refining waste mineral oil - Google Patents
Method and device for regenerating and refining waste mineral oil Download PDFInfo
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- CN111019752A CN111019752A CN201911338765.5A CN201911338765A CN111019752A CN 111019752 A CN111019752 A CN 111019752A CN 201911338765 A CN201911338765 A CN 201911338765A CN 111019752 A CN111019752 A CN 111019752A
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M175/00—Working-up used lubricants to recover useful products ; Cleaning
- C10M175/02—Working-up used lubricants to recover useful products ; Cleaning mineral-oil based
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M175/00—Working-up used lubricants to recover useful products ; Cleaning
- C10M175/0025—Working-up used lubricants to recover useful products ; Cleaning by thermal processes
- C10M175/0033—Working-up used lubricants to recover useful products ; Cleaning by thermal processes using distillation processes; devices therefor
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M175/00—Working-up used lubricants to recover useful products ; Cleaning
- C10M175/005—Working-up used lubricants to recover useful products ; Cleaning using extraction processes; apparatus therefor
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Abstract
The invention discloses a method and a device for regenerating and refining waste mineral oil, wherein the method comprises the steps of extracting the waste mineral oil by using a refining agent, and obtaining refined oil by flash evaporation of an extracted upper-layer material obtained by two-time extraction; the extracted lower layer material obtained by four times of stilling and layering is treated without pollution. The method improves recovery rate and production efficiency of waste mineral oil refining, and reduces production cost and investment cost. The device for regenerating and refining the waste mineral oil comprises a first premixer, a first extraction device, a second premixer, a second extraction device, a first recovery device and a second recovery device.
Description
Technical Field
The invention relates to a waste mineral oil treatment method, in particular to a waste mineral oil regeneration refining method and a waste mineral oil regeneration refining device.
Background
The waste mineral oil is oil which is changed when the waste mineral oil cannot be used continuously due to the change of the original physical and chemical properties under the actions of impurity pollution, oxidation and heat; for example, oil sludge and oil bottoms from oil recovery and refining; deposits produced during the warehousing of mineral oils; oil residue and filter medium in the process of oil replacement and regeneration of machinery, power, transportation and other equipment. The waste mineral oil contains hydrocarbon substances with a relatively small number of carbon atoms, and most of the waste mineral oil is unsaturated hydrocarbon. The main component of the catalyst is hydrocarbons with different chain lengths, and the performance is stable.
At present, the regeneration and refining method of waste mineral oil mainly adopts a sulfuric acid clay method, a furfural refining method, hydrogenation and other methods, and the waste mineral oil is refined to meet the recycling requirement of base oil.
The waste mineral oil can be refined by methods such as a sulfuric acid clay method, a furfural refining method, hydrogenation and the like, but the following problems are respectively caused in the treatment process:
the carclazyte sulfate method is forbidden by the nation to cause secondary pollution to the environment because of too large amount of secondary hazardous waste;
although the furfural refining has a certain effect, the problems of equipment corrosion, high energy consumption for recovery and the like cannot be solved;
the hydrofining method has good product and high yield. But operational risks and production costs are high.
Therefore, a method for treating waste mineral oil with small amount of secondary hazardous waste, low energy consumption for recovery, low equipment investment cost, low treatment cost and low operation risk is urgently needed.
Disclosure of Invention
Aiming at the defects of large secondary hazardous waste amount, high recovery energy consumption, high equipment investment cost, high operation risk, high treatment cost and the like in the treatment process of the waste mineral oil in the prior art, the invention aims to provide the waste mineral oil regeneration refining method. The obtained refined oil can be reused, and the components of the refining agent can be reused.
In order to realize the purpose of the invention, the technical scheme adopted by the invention is as follows:
a regeneration refining method of waste mineral oil comprises the following steps:
(1) mixing the waste mineral oil by utilizing a refining agent to perform primary extraction to obtain a first upper-layer material and a first lower-layer material;
(2) performing second extraction on the first upper-layer material by using the refining agent to obtain a second upper-layer material and a second lower-layer material,
(3) carrying out flash evaporation on the second upper-layer material to obtain refined oil, combining the second lower-layer material with the first lower-layer material, and then placing and layering to obtain a third upper-layer material and a third lower-layer material;
(4) the third upper-layer material is used for extracting waste mineral oil, or is mixed with a refining agent and then is used for extracting the waste mineral oil, and the third lower-layer material is placed and layered to obtain a fourth upper-layer material and a fourth lower-layer material;
(5) and the fourth upper material is used for extracting waste mineral oil, or is mixed with a refining agent and then is used for extracting the waste mineral oil, and the fourth lower material is subjected to harmless treatment.
In a preferred embodiment, in the method for regenerating and refining waste mineral oil, the refining agent is a mixture of N-methyl-2-pyrrolidone (NMP) and aromatic hydrocarbon in a weight ratio of 1: 0.1-1.5. In a more preferred embodiment, the weight ratio of N-methyl-2-pyrrolidone to aromatic hydrocarbon is 1:0.8 to 1.2. In a most preferred embodiment, the weight ratio of N-methyl-2-pyrrolidone to aromatic hydrocarbon is 1:1.
In a preferred embodiment, in the method for regenerating and refining waste mineral oil, the refining agent is a mixture of N, N-Dimethylformamide (DMF) and ethanol in a weight ratio of 1: 0.1-0.5. In a more preferred embodiment, the weight ratio of N, N-dimethylformamide to ethanol is from 1:0.2 to 0.4. In a most preferred embodiment, the weight ratio of N, N-dimethylformamide to ethanol is 1: 0.3.
In a preferred embodiment, in the step (1) of the method for regenerating and refining the waste mineral oil, the refining agent is a mixture of N-methyl-2-pyrrolidone and aromatic hydrocarbon, and the weight ratio of the waste mineral oil to the refining agent is 1: 0.5-2. In a more preferred embodiment, the weight ratio of the waste mineral oil to the refining agent is 1:1 to 1.5. In a most preferred embodiment, the weight ratio of waste mineral oil to the refining agent is 1: 1.2.
In a preferred embodiment, in the step (1) of the method for regenerating and refining the waste mineral oil, the refining agent is a mixture of N, N-dimethylformamide and ethanol, and the weight ratio of the waste mineral oil to the refining agent is 1: 0.5-3. In a more preferred embodiment, the weight ratio of the waste mineral oil to the refining agent is 1: 1.5-2. In a most preferred embodiment, the weight ratio of waste mineral oil to the refining agent is 1: 1.8.
In a preferred embodiment, in the process for the regenerative refining of waste mineral oil according to the present invention, the aromatic hydrocarbon is recovered aromatic hydrocarbon. In a preferred embodiment, the aromatic hydrocarbon is a mixture of monocyclic aromatic hydrocarbons, bicyclic aromatic hydrocarbons, polycyclic aromatic hydrocarbons, fused ring aromatic hydrocarbons, and the like.
In a preferred embodiment, in the step (2) of the method for regenerating and refining waste mineral oil according to the present invention, the refining agent is a mixture of N-methyl-2-pyrrolidone and aromatic hydrocarbon, and the weight ratio of the first upper material to the refining agent is 1: 2.5.
In a preferred embodiment, in the step (2) of the method for regenerating and refining waste mineral oil according to the present invention, the refining agent is a mixture of N, N-dimethylformamide and ethanol, and the weight ratio of the first upper material to the refining agent is 1: 3.
In a preferred embodiment, in step (3) of the waste mineral oil recycling refining process of the present invention, the conditions for flashing to obtain refined oil are, pressure: 50-2000 pa, temperature: 200 to 300 ℃.
In a preferred embodiment, the harmless treatment in the step (5) of the waste mineral oil recycling and refining method of the present invention comprises the steps of, pressure 50 to 2000pa, temperature: 200 to 300 ℃.
The present invention also provides an apparatus for regenerating and refining waste mineral oil, which comprises a first premixer for mixing therein waste mineral oil with a refining agent, a first extraction apparatus for extracting therein waste mineral oil with a refining agent, a second premixer for mixing therein said first upper material with a refining agent, a second extraction apparatus for extracting therein said first upper material with a refining agent, a first recovery apparatus for combining, standing and layering therein said first lower material with said second lower material, and a second recovery apparatus for standing and layering therein said third lower material,
the first extraction device is connected with the first premixer, the second premixer and the first recovery device, the second extraction device is connected with the second premixer and the first recovery device, the first recovery device is connected with the first premixer and the second recovery device, and the second recovery device is connected with the first premixer.
In a preferred embodiment, the apparatus for regenerating and refining waste mineral oil of the present invention further comprises a flash evaporation apparatus connected to the second extraction apparatus for flash evaporation of the second upper material to obtain refined oil.
In a preferred embodiment, the apparatus for the regenerative refining of waste mineral oil according to the present invention further comprises a harmless treatment apparatus connected to the second recovery apparatus.
In the method for regenerating and refining the waste mineral oil, the waste mineral oil is firstly extracted for the first time by utilizing a refining agent to obtain a first upper-layer material and a first lower-layer material; extracting the first upper-layer material for the second time by using a refining agent to obtain a second upper-layer material and a second lower-layer material; carrying out flash evaporation on the obtained second upper-layer material to obtain refined oil, combining the obtained second lower-layer material with the first lower-layer material, and standing and layering to obtain a third upper-layer material and a third lower-layer material; the third upper layer material is used for extracting the waste mineral oil independently or is mixed with a refining agent to be used for extracting the waste mineral oil, and the third lower layer material is kept stand and layered to obtain a fourth upper layer material and a fourth lower layer material; the fourth upper material is used for extracting the waste mineral oil independently or is mixed with a refining agent to be used for extracting the waste mineral oil, and the fourth lower material is subjected to harmless treatment. Therefore, in the method for regenerating and refining the waste mineral oil, the refining agent is used for extracting the waste mineral oil, so that the organic components in the waste mineral oil are fully extracted, the organic components and the refining agent are subjected to flash evaporation to prepare the refined oil, and the extracted lower-layer material obtained by standing and layering for four times is subjected to pollution-free treatment. And the refining agent can use the recovered aromatic hydrocarbon, so that the cost of the used refining agent is low. The obtained refined oil can be reused, and the components of the refining agent can be reused.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain and explain part of the invention.
FIG. 1 is an apparatus for regenerating and refining waste mineral oil according to the present invention.
Detailed Description
In the description of the present invention, the waste mineral oil includes, but is not limited to, waste mineral oil obtained by replacing lubricating oil used in factories of transportation vehicles (automobiles, ships, rail trains, engineering vehicles, etc.), mechanical lubrication, ferrous metallurgy, etc., and the components mainly include base oil, moisture, mechanical impurities, oxidized colloidal asphaltenes formed by spent additives, aromatic hydrocarbons, etc.
In the present description, the refining agent may also be referred to as an extractant, including, but not limited to, a mixture of N-methyl-2-pyrrolidone and an aromatic hydrocarbon, and a mixture of N, N-dimethylformamide and ethanol.
In the present description, in the process of producing refined oil by flash evaporation, the low boiling point components of the second upper layer material (the components of the lubricant base oil in the case of the used lubricant oil replaced from machinery, power, transportation, etc., and the low boiling point components of the refining agent, such as aromatic hydrocarbons or ethanol) are obtained by distillation and can be reused (for example, used as lubricant base oil); the high boiling point components of the second upper layer material, such as N-methyl-2-pyrrolidone (NMP) and N, N-Dimethylformamide (DMF), are not distilled off, and as a flash-evaporated residue material, they can be used again as a refining agent after being mixed with aromatic hydrocarbons and ethanol in a certain proportion, respectively.
In the description of the present invention, the selection of the components of the refining agent depends on the use of the refined oil obtained by regenerating the refined waste mineral oil. For example, in the case of a lubricating oil which is exchanged from a machine, power, transportation, or the like, the obtained refined oil is reused as a lubricating oil base oil, and the aromatic hydrocarbon in the refining agent is preferably used as an aromatic hydrocarbon of the lubricating oil.
In the description of the present invention, "connected" includes fluid communication connections.
In the description of the present invention, each component of the apparatus for regenerating and refining waste mineral oil includes other components as required in practical use. For example, the first extraction device and the second extraction device may also be provided with heating devices.
The invention is further illustrated with reference to the following figures and specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. The experimental procedures, for which specific conditions are not indicated in the following examples, are generally carried out under conventional conditions, or under conditions recommended by the manufacturer. Percentages are by weight unless otherwise indicated.
Example 1
Referring to fig. 1, in this embodiment, the apparatus for regenerating and refining waste mineral oil includes a first premixer 1, a first extraction apparatus 2, a second premixer 3, a second extraction apparatus 4, a first recovery apparatus 5, a second recovery apparatus 6, a conduit 10 for supplying a refining agent to the first premixer 1, and a conduit 11 for supplying waste mineral oil.
The apparatus may also include a flash apparatus (not shown in fig. 1) connected to the second extraction apparatus 4, and a treatment apparatus (not shown in fig. 1) connected to the second recovery apparatus 6.
The first premixer 1 is used to mix the refining agent and the waste mineral oil therein. The first extraction device 2 is used for extracting the waste mineral oil by using a refining agent to obtain a first upper material and a first lower material. The second premixer 3 is used for mixing the above-mentioned first upper material and the refining agent. The second extraction device 4 is used for extracting the first upper material by using a refining agent to obtain a second upper material and a second lower material. The first recycling device 5 is used for combining the first lower-layer material and the second lower-layer material, standing and layering the materials to obtain a third lower-layer material and a third upper-layer material. The second recovery device 6 is used for standing and layering the third lower-layer material to obtain a fourth lower-layer material and a fourth upper-layer material.
The first premixer 1 and the first extraction apparatus 2 are connected to feed the mixture (material) of the refining agent and the waste mineral oil therein to the first extraction apparatus 2. The first extraction device 2 is connected with the second premixer 3 and the first recovery device 5, and is respectively used for conveying the first upper material to the second premixer 3 and conveying the first lower material to the first recovery device 5. The second premixer 3 is also connected to the second extraction device 4 for feeding the mixed material of the first upper material and the refining agent therein to the second extraction device 4. The second extraction device 4 is also connected with the first recovery device 5 and is used for conveying the second lower-layer materials in the second extraction device to the first recovery device 5. The second extraction apparatus 4 may also be connected to a flash apparatus (not shown) for transferring the second overhead therefrom to the flash apparatus. The first reclaimer 5 is further connected to the first premixer 1 and the second reclaimer 6 for feeding the third upper layer material therein to the first premixer 1 (for mixing with the waste mineral oil alone or after mixing with fresh refining agent) and the third lower layer material therein to the second reclaimer 6, respectively. The second recovery device 6 is also connected with the first premixer 1 and the treatment device, and is respectively used for conveying the fourth upper material to the first premixer 1 (for mixing with waste mineral oil alone or after mixing with fresh refining agent) and conveying the fourth lower material to the treatment device for pollution-free treatment.
Example 2
The process of regenerating and refining the waste mineral oil by using the apparatus shown in FIG. 1 is as follows:
(1) mixing the waste mineral oil conveyed through a pipeline 10 and a refining agent conveyed through a pipeline 11 in a first premixer 1 according to a certain proportion, conveying the mixture to a first extraction device (2) for extraction, standing and layering to obtain a first upper layer material and a first lower layer material;
(2) conveying a first lower layer material in a first extraction device (2) into a first recovery device (5), conveying a first upper layer material in the first extraction device (2) into a second premixer (3), fully mixing with a refining agent, conveying into a second extraction device (2), extracting the first upper layer material by using the refining agent, standing and layering to obtain a second upper layer material and a second lower layer material;
(3) conveying the second upper-layer material to a flash evaporation device for flash evaporation to obtain refined oil, conveying the second lower-layer material to a first recovery device (5) for combination with the first lower-layer material therein, standing and layering to obtain a third upper-layer material and a third lower-layer material;
(4) the third upper material in the first recovery device (5) is conveyed to a first extraction device (1) through a pipeline 10 for being mixed with waste mineral oil alone or after being mixed with fresh refining agent, and the third lower material is conveyed to a second recovery device (6) for standing and layering to obtain a fourth upper material and a fourth lower material;
(5) the fourth upper material in the second recovery device (6) is conveyed to the first extraction device (1) through a pipeline 10 for being mixed with waste mineral oil alone or after being mixed with fresh refining agent, and the fourth lower material is output for pollution-free treatment.
Example 3
Example 2 describes a process wherein the waste mineral oil is obtained by replacing lubricating oil used in factories of transportation means (automobiles, ships, rail trains, engineering vehicles, etc.), mechanical equipment, ferrous metallurgy, etc., and the components mainly comprise base oil, moisture, mechanical impurities, oxidized colloid asphaltene formed by ineffective additives, and aromatic hydrocarbon.
In the process described in example 2, the refining agents used were in the weight ratio 1:1, the aromatic hydrocarbon is obtained from commercial products, and the manufacturer is Jiujiang petrochemical group, and the type of the aromatic hydrocarbon is DHA heavy aromatic hydrocarbon. The weight ratio of the waste mineral oil to the refining agent in the step (1) is 1: 1.2. The weight ratio of the first upper layer material to the refining agent in the step (2) is 1: 2.5.
In the process described in example 2, the flash evaporation in step (3) is carried out under the conditions of pressure 50-2000 pa, temperature: 200 to 300 ℃.
Example 2 describes a process wherein the fourth, lower layer of material in step (5) is subjected to harmless disposal by incineration.
The quality indexes of the refined oil obtained by flash evaporation are as follows: chroma: 1, viscosity index: 95, pour point: the lubricating oil meets QSY-44-2009-general lubricating oil base oil standard and T/CRRA 0901-2018, regenerated lubricating oil base oil standard at the temperature of-15 ℃, and can be used for producing lubricating oil.
The main component of the residual material obtained after flash evaporation is NMP, and the weight ratio of NMP to aromatic hydrocarbon is 1:1 and then used again as a refining agent.
Example 4
Example 2 describes a process wherein the waste mineral oil is obtained by replacing lubricating oil used in factories of transportation means (automobiles, ships, rail trains, engineering vehicles, etc.), mechanical equipment, ferrous metallurgy, etc., and the components mainly comprise base oil, moisture, mechanical impurities, oxidized colloid asphaltene formed by ineffective additives, and aromatic hydrocarbon.
In the process described in example 2, the refining agents used were in the weight ratio 1:0.3 weight ratio of DMF and ethanol of waste mineral oil to refining agent in step (1) was 1: 1.8. In the step (2), the weight ratio of the first upper layer material to the refining agent is 1: 1.5.
in the process described in example 2, the flash evaporation in step (3) is carried out under the conditions of pressure 50-2000 pa, temperature: 200 to 300 ℃. Quality index chroma of refined oil obtained by flash evaporation: 2; viscosity index: 92; pour point: -19 ℃.
Example 2 describes a process wherein the fourth, lower layer of material in step (5) is subjected to harmless disposal by incineration.
Quality index chroma of refined oil obtained by flash evaporation: 2; viscosity index: 92; pour point: the temperature is-19 ℃, meets QSY-44-2009-general lubricating oil base oil standard and T/CRRA 0901-2018, regenerated lubricating oil base oil standard, and can be used for producing lubricating oil.
After flash evaporation, the main component of the obtained residual material is DMF, and the weight ratio of DMF to ethanol is 1:0.3, and then used again as a refining agent.
Example 5
Example 2 describes a process wherein the waste mineral oil is obtained by replacing lubricating oil used in factories of transportation means (automobiles, ships, rail trains, engineering vehicles, etc.), mechanical equipment, ferrous metallurgy, etc., and the components mainly comprise base oil, moisture, mechanical impurities, oxidized colloid asphaltene formed by ineffective additives, and aromatic hydrocarbon.
In the process described in example 2, the refining agents used were in the weight ratio 1:0.8 of a mixture of NMP and aromatic hydrocarbons, commercially available from jiujiang petrochemical group, type DHA heavy aromatics. The weight ratio of the waste mineral oil to the refining agent in the step (1) is 1:1. The weight ratio of the first upper layer material to the refining agent in the step (2) is 1: 5.
In the process described in example 2, the flash evaporation in step (3) is carried out under the conditions of pressure 50-2000 pa, temperature: 200 to 300 ℃.
Example 2 describes a process wherein the fourth, lower layer of material in step (5) is subjected to harmless disposal by incineration.
The quality indexes of the refined oil obtained by flash evaporation are chroma: 0.3; viscosity index: 105; pour point: the lubricating oil meets QSY-44-2009-general lubricating oil base oil standard and T/CRRA 0901-2018, regenerated lubricating oil base oil standard at the temperature of 18 ℃ below zero, and can be used for producing lubricating oil.
The main component of the residual material obtained after flash evaporation is NMP, and the weight ratio of NMP to aromatic hydrocarbon is 1:0.8, and used again as a refining agent.
Example 6
Example 2 describes a process wherein the waste mineral oil is obtained by replacing lubricating oil used in factories of transportation means (automobiles, ships, rail trains, engineering vehicles, etc.), mechanical equipment, ferrous metallurgy, etc., and the components mainly comprise base oil, moisture, mechanical impurities, oxidized colloid asphaltene formed by ineffective additives, and aromatic hydrocarbon.
In the process described in example 2, the refining agents used were in the weight ratio 1:0.2 DMF and ethanol. The weight ratio of the waste mineral oil to the refining agent in the step (1) is 1: 1.5. The weight ratio of the first upper layer material to the refining agent in the step (2) is 1: 2.8.
In the process described in example 2, the flash evaporation in step (3) is carried out under the conditions of pressure 50-2000 pa, temperature: 200 to 300 ℃.
Example 2 describes a process wherein the fourth, lower layer of material in step (5) is subjected to harmless disposal by incineration.
The quality indexes of the refined oil obtained by flash evaporation are chroma: 0.5; viscosity index: 102, and (b); pour point: -16 ℃. Meets QSY-44-2009-general lubricating oil base oil standard and T/CRRA 0901-2018, regenerated lubricating oil base oil standard, and can be used for producing lubricating oil.
After flash evaporation, the main component of the obtained residual material is DMF, and the weight ratio of DMF to ethanol is 1:0.2, and then used again as a refining agent.
Example 7
Example 2 describes a process wherein the waste mineral oil is obtained by replacing lubricating oil used in factories of transportation means (automobiles, ships, rail trains, engineering vehicles, etc.), mechanical equipment, ferrous metallurgy, etc., and the components mainly comprise base oil, moisture, mechanical impurities, oxidized colloid asphaltene formed by ineffective additives, and aromatic hydrocarbon.
In the process described in example 2, the refining agents used were in the weight ratio 1:1.2 of a mixture of NMP and aromatic hydrocarbons, which are commercially available from jiujiang petrochemical group, type DHA heavy aromatics. The weight ratio of the waste mineral oil to the refining agent in the step (1) is 1: 1.5. The weight ratio of the first upper layer material to the refining agent in the step (2) is 1:2.
In the process described in example 2, the flash evaporation in step (3) is carried out under the conditions of pressure 50-2000 pa, temperature: 200 to 300 ℃.
Example 2 describes a process wherein the fourth, lower layer of material in step (5) is subjected to harmless disposal by incineration.
The quality indexes of the refined oil obtained by flash evaporation are chroma: 1; a viscosity index of 100; pour point-15. Meets QSY-44-2009-general lubricating oil base oil standard and T/CRRA 0901-2018, regenerated lubricating oil base oil standard, and can be used for producing lubricating oil.
The main component of the residual material obtained after flash evaporation is NMP, and the weight ratio of NMP to aromatic hydrocarbon is 1:1.2 mixing and then using as a refining agent again.
Example 8
Example 2 describes a process wherein the waste mineral oil is obtained by replacing lubricating oil used in factories of transportation means (automobiles, ships, rail trains, engineering vehicles, etc.), mechanical equipment, ferrous metallurgy, etc., and the components mainly comprise base oil, moisture, mechanical impurities, oxidized colloid asphaltene formed by ineffective additives, and aromatic hydrocarbon.
In the process described in example 2, the refining agents used were in the weight ratio 1: 0.4 DMF and ethanol. The weight ratio of the waste mineral oil to the refining agent in the step (1) is 1:2. The weight ratio of the first upper layer material to the refining agent in the step (2) is 1:1.
In the process described in example 2, the flash evaporation in step (3) is carried out under the conditions of pressure 50-2000 pa, temperature: 200 to 300 ℃.
Example 2 describes a process wherein the fourth, lower layer of material in step (5) is subjected to harmless disposal by incineration.
The quality indexes of the refined oil obtained by flash evaporation are chroma: 1.8; viscosity index: 97, a stabilizer; pour point: -18 ℃. Meets QSY-44-2009-general lubricating oil base oil standard and T/CRRA 0901-2018, regenerated lubricating oil base oil standard, and can be used for producing lubricating oil.
After flash evaporation, the main component of the obtained residual material is DMF, and the weight ratio of DMF to ethanol is 1: 0.4, and used again as a refining agent.
According to the embodiment, the method for regenerating and refining the waste mineral oil can improve the refining recovery rate of the waste mineral oil and greatly improve the resource reutilization rate; meanwhile, the treatment production efficiency of the waste mineral oil can be improved, and the production cost and the investment cost can be reduced.
The invention has been described above without limitation by way of examples of preferred production modalities according to the invention, but it should be understood that variations and/or modifications can be made by a person skilled in the art within the scope defined by the appended claims, without departing from the relative scope of protection.
Claims (10)
1. A method for regenerating and refining waste mineral oil is characterized by comprising the following steps:
(1) mixing the waste mineral oil by utilizing a refining agent to perform primary extraction to obtain a first upper-layer material and a first lower-layer material;
(2) performing second extraction on the first upper-layer material by using the refining agent to obtain a second upper-layer material and a second lower-layer material,
(3) carrying out flash evaporation on the second upper-layer material to obtain refined oil, combining the second lower-layer material with the first lower-layer material, and then placing and layering to obtain a third upper-layer material and a third lower-layer material;
(4) the third upper-layer material is used for extracting waste mineral oil, or is mixed with a refining agent and then is used for extracting the waste mineral oil, and the third lower-layer material is placed and layered to obtain a fourth upper-layer material and a fourth lower-layer material;
(5) and the fourth upper material is used for extracting waste mineral oil, or is mixed with a refining agent and then is used for extracting the waste mineral oil, and the fourth lower material is subjected to harmless treatment.
2. The method for regenerating and refining waste mineral oil as claimed in claim 1, wherein the refining agent is a mixture of the following components in a weight ratio of 1: 0.1-1.5 of a mixture of N-methyl-2-pyrrolidone and aromatic hydrocarbon, or a mixture of N-methyl-2-pyrrolidone and aromatic hydrocarbon in a weight ratio of 1:0.1 to 0.5 of a mixture of N, N-dimethylformamide and ethanol.
3. The method for regenerating and refining waste mineral oil as claimed in claim 2, wherein in the step (1), when the refining agent is a mixture of N-methyl-2-pyrrolidone and aromatic hydrocarbon, the weight ratio of the waste mineral oil to the refining agent is 1: 0.5-2; when the refining agent is a mixture of N, N-dimethylformamide and ethanol, the weight ratio of the waste mineral oil to the refining agent is 1: 0.5-3.
4. The process of claim 2, wherein the aromatic hydrocarbon is recovered aromatic hydrocarbon.
5. The method for regenerating and refining waste mineral oil as claimed in claim 2, wherein in the step (2), when the refining agent is a mixture of N-methyl-2-pyrrolidone and aromatic hydrocarbon, the weight ratio of the first upper material to the refining agent is 1: 1-5; when the refining agent is a mixture of N, N-dimethylformamide and ethanol, the weight ratio of the first upper layer material to the refining agent is 1: 1-5.
6. The method for regenerating and refining waste mineral oil as claimed in claim 1, wherein in the step (3), the conditions for obtaining refined oil by flash evaporation are: 50-2000 pa, temperature: 200 to 300 ℃.
7. The process of claim 1, wherein the step (5) of treating the waste mineral oil to be harmless comprises incinerating the waste mineral oil.
8. A device for regenerating and refining waste mineral oil is characterized by comprising a first premixer (1), a first extraction device (2), a second premixer (3), a second extraction device (4), a first recovery device (5) and a second recovery device (6),
the first extraction device (2) is connected with the first premixer (1), the second premixer (3) and the first recovery device (5), the second extraction device (4) is connected with the second premixer (3) and the first recovery device (5), the first recovery device (5) is connected with the first premixer (1) and the second recovery device (6), and the second recovery device (6) is also connected with the first premixer (1).
9. The apparatus according to claim 8, characterized in that it further comprises a flash device connected to the second extraction device (4).
10. The apparatus according to claim 8, characterized in that it further comprises a harmless treatment device connected to the second recovery device (6).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113061481A (en) * | 2021-03-27 | 2021-07-02 | 刘新华 | Recovery, purification and recycling process of waste mineral oil |
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