CN111635811B - Deep refining process and system for waste lubricating oil - Google Patents
Deep refining process and system for waste lubricating oil Download PDFInfo
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- CN111635811B CN111635811B CN202010506164.7A CN202010506164A CN111635811B CN 111635811 B CN111635811 B CN 111635811B CN 202010506164 A CN202010506164 A CN 202010506164A CN 111635811 B CN111635811 B CN 111635811B
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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
- C10M175/0016—Working-up used lubricants to recover useful products ; Cleaning with the use of chemical agents
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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
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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
- C10M175/0083—Lubricating greases
Abstract
The invention discloses a deep refining process and a deep refining system for waste lubricating oil, and belongs to the technical field of waste lubricating oil recovery. The following technical scheme is specifically disclosed: (1) pretreatment: carrying out primary refining on the waste lubricating oil by a conventional method to obtain crude oil; (2) refining a solvent: mixing the crude oil with an organic solvent, and carrying out solvent refining to obtain crude oil subjected to solvent refining; (3) alkali refining: fully mixing the crude oil refined by the solvent with an alkaline additive, and carrying out catalytic polymerization at the temperature of 180-220 ℃ for 1-2h to obtain base oil; (4) fractional distillation: fractionating the base oil at 250-350 ℃ to obtain a first-line lubricating oil and a second-line lubricating oil. By the technical scheme provided by the invention, the chroma and the rotating oxygen and nitrogen after the waste lubricating oil is recovered are superior to those of the prior art. In addition, when the deep refining step is matched with solvent refining, the use amount of the organic solvent is greatly reduced, the recovery cost of the waste lubricating oil is reduced, and the method is favorable for industrial popularization.
Description
Technical Field
The invention relates to the technical field of waste lubricating oil recovery, in particular to a process and a system for deep refining of waste lubricating oil.
Background
The used lubricating oil refers to used lubricating oil that has been exchanged from various machines, vehicles, and ships. According to incomplete statistics, the lubricating oil consumption of China is gradually increased year by year in recent years. In 2010, the consumption of lubricating oil in China exceeds 1000 ten thousand tons, nearly 950 ten thousand tons of waste lubricating oil are generated, less than 10 percent of the waste lubricating oil is recycled, most of the waste lubricating oil is poured or burned on the spot, a large amount of resources are wasted, and serious environmental pollution is caused.
Lubricating oil accounts for a significant portion of the world's petroleum product consumption, second only to fuel oil. With the rapid national economy, the consumption of lubricating oil in China has increased by over 5 percent in recent years. In the using process, the lubricating oil is in contact with metal devices and air, is polluted by moisture and dust, is diluted by gasoline, and is exposed to environments such as high temperature, high pressure, electric field and the like, so that the physical and chemical properties and the service performance of the lubricating oil are changed, and the lubricating oil becomes waste oil. The waste lubricating oil composition contains 2-10% of deterioration, and the rest 90-98% is completely reusable.
However, in the prior art, the recovery rate of the waste lubricating oil in China is very low, so that great energy waste and environmental pollution are caused, and the conventional refining method is to use a solvent alone for refining or use other refining agents alone for hydrogenation or cracking refining. Therefore, the technical problem to be solved by the technical personnel in the field is to select a reasonable process, scale and specialization for the regeneration and utilization of the waste lubricating oil and provide a deep refining method of the waste lubricating oil with low recovery cost.
Disclosure of Invention
In view of the above, the present invention provides a deep refining process and system for waste lubricating oil, which can effectively improve the quality of lubricating oil and reduce the recovery cost.
In order to achieve the purpose, the invention adopts the following technical scheme:
the deep refining process of the waste lubricating oil is characterized by comprising the following steps of:
(1) pretreatment: carrying out primary refining on the waste lubricating oil by a conventional method to obtain crude oil;
(2) and (3) refining a solvent: mixing the crude oil with an organic solvent, and carrying out solvent refining to obtain crude oil subjected to solvent refining;
(3) alkali refining: fully mixing the crude oil refined by the solvent with an alkaline additive, and carrying out catalytic polymerization at the temperature of 180-220 ℃ for 1-2h to obtain base oil;
(4) fractional distillation: fractionating the base oil at 250-350 ℃ to obtain first-line lubricating oil and second-line lubricating oil;
(5) and (3) post-treatment: and mixing the fractionation residue with distillation tail oil, and selling as a product.
The invention combines the alkaline catalytic refining and the solvent refining of the lubricating oil, can greatly reduce the impurity content in the waste lubricating oil, reduce the chroma of the refined oil and simultaneously ensure that the rotating oxygen nitrogen can be larger than 180 minutes. In addition, the technical scheme of the invention can also reduce the solvent consumption in the conventional solvent refining process, thereby reducing the solvent loss and saving the cost of deep refining of the waste lubricating oil.
Preferably, the solvent in step (2) is any one of furfural, methyl pyrrolidone or dimethylformamide.
Preferably, the mass ratio of the organic solvent to the oil is (0.6-0.8): 1.
According to the method, the organic solvent is used as the refining agent for refining, and then the alkali refining agent is used for further refining the crude oil, so that the use amount of the solvent in the traditional solvent refining method can be reduced, and further the deep refining cost of the waste lubricating oil is saved.
Preferably, the alkaline additive in step (3) is any one or a combination of several of sodium hydroxide, potassium hydroxide and calcium hydroxide.
Preferably, the addition amount of the alkaline additive is 0.5-1.5 wt%
The alkaline additive is used as a catalytic refining agent, and can fully react and decompose unsaturated hydrocarbon, colloid asphaltene and partial sulfur-containing and nitrogen-containing compounds in crude oil, so that the impurity content in the lubricating oil is reduced.
Preferably, the fractionation pressure in step (4) is 100-300Pa absolute.
A deep refining process system for waste lubricating oil comprises a heater, a refining reactor, a heating furnace, a fractionating tower, a cooler, a receiving tank and a vacuum pump;
the refining reactor comprises a first feeding hole, a second feeding hole, a discharging hole and a first gas outlet; the first feeding hole is connected with the heater;
The fractionating tower comprises a third feeding hole, a fourth feeding hole, a second air outlet, a first side line, a second side line and a fractionating residue outlet;
the third feeding hole is communicated with the first air outlet; the second air outlet is sequentially connected with the cooler, the receiving tank and the vacuum pump in series through pipelines
And one end of the heating furnace is connected with the feed inlet IV, and the other end of the heating furnace is connected with the discharge outlet.
The deep refining process system for the waste lubricating oil can meet the requirements of alkali refining and solvent refining of the lubricating oil, and meanwhile, in the refining reactor, because the refining reaction is carried out under the heating condition, volatile components and low boiling points in the waste lubricating oil are easy to change into gas phase. Furthermore, a second air outlet on the fractionating tower is connected with the cooler, so that the gas-phase components can be condensed into liquid, and the fractionated lubricating oil can be fully recycled.
In addition, the fractionation residual outlet in the present invention can separate the separated fractionation residual components in the split process, and can condense the gas phase components for full use.
According to the technical scheme, compared with the prior art, the invention provides the deep refining process and the deep refining system for the waste lubricating oil. Firstly, the invention can obviously improve the product quality, in the prior art, the chroma of the refined lubricating oil obtained by the traditional waste lubricating oil refining process is 1.0-1.5, and the chroma of the lubricating oil can reach 0.6-0.8 by adopting the alkaline catalytic polymerization and organic solvent combination for refining, thereby better adapting to the market demand. Meanwhile, the lubricating oil rotary oxygen-nitrogen obtained by the refining process can be more than 180 minutes, and meets the national standard. In addition, in the process of refining by singly using the solvent in the prior art, the mass ratio of the organic solvent to the crude oil is (1.2-1.5):1, and the invention also carries out alkali refining after the solvent refining, so that the impurity content in the crude oil can be further reduced, and further, in the process of refining the solvent, the final deep refining effect can be achieved only by making the mass ratio of the organic solvent to the oil be 0.6-0.8, the loss of the organic solvent is reduced, the cost is saved, and the energy consumption in the process of recovering the solvent is also reduced. Finally, the invention makes the waste lubricating oil fully recycled and reduces the loss of the waste lubricating oil by condensing and recycling the gas-phase components after fractionation and mixing the fractionation residues with the distillation tail oil.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic view of a system for deep refining of waste lubricating oil according to the present invention;
the device comprises a heater 1, a refining reactor 2, a first feed inlet 21, a second feed inlet 22, a discharge outlet 23, a first gas outlet 24, a heater 3, a fractionating tower 4, a third feed inlet 41, a fourth feed inlet 42, a second gas outlet 43, a first side line 44, a second side line 45, a fractionation residue outlet 46, a cooler 5, a receiving tank 6 and a vacuum pump 7.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention discloses a deep refining process of waste lubricating oil, which comprises the following steps:
(1) pretreatment: carrying out primary refining on the waste lubricating oil by a conventional method to obtain crude oil;
(2) refining a solvent: mixing the crude oil with an organic solvent, and carrying out solvent refining to obtain crude oil subjected to solvent refining;
(3) alkali refining: fully mixing the crude oil refined by the solvent with an alkaline additive, and carrying out catalytic polymerization at the temperature of 180-220 ℃ for 1-2h to obtain base oil;
(4) fractional distillation: fractionating the base oil at the temperature of 250-350 ℃ to obtain first-line lubricating oil and second-line lubricating oil;
(5) and (3) post-treatment: the residue of the fractionation is mixed with distillation tail oil and sold as a product.
In order to further optimize the technical scheme of the invention, the organic solvent in the step (2) is any one of furfural, methyl pyrrolidone or dimethylformamide.
Further, the mass ratio of the organic solvent to the oil in the step (2) is (0.6-0.8): 1.
Further, the alkali in the step (3) is any one or a combination of several of sodium hydroxide, potassium hydroxide and calcium hydroxide.
Further, the adding amount of the alkaline additive in the step (3) is 0.5 to 1.5 weight percent
Further, the distillation pressure in the step (4) is 100-300Pa absolute.
The embodiment of the invention also discloses a deep refining process system for the waste lubricating oil, which comprises a heater, a refining reactor, a heating furnace, a fractionating tower, a cooler, a receiving tank and a vacuum pump;
wherein, the refining reactor comprises a first feeding port, a second feeding port, a discharging port and a first air outlet; the first feeding hole is connected with a heater;
the fractionating tower comprises a third feeding hole, a fourth feeding hole, a second gas outlet, a first lateral line, a second lateral line and a fractionating residue outlet;
the feed inlet III is communicated with the air outlet I; the second gas outlet is sequentially connected with the cooler, the receiving tank and the vacuum pump in series through pipelines
One end of the heating furnace is connected with the feed inlet IV, and the other end of the heating furnace is connected with the discharge outlet.
Example 1
A deep refining process system for waste lubricating oil has the following structure:
comprises a heater 1, a refining reactor 2, a heating furnace 3, a fractionating tower 4, a cooler 5, a receiving tank 6 and a vacuum pump 7; the refining reactor 2 comprises a first feeding hole 21, a second feeding hole 22, a discharging hole 23 and a first air outlet 24; the first feeding hole 21 is connected with the heater 1; the fractionation column 4 includes a feed inlet three 41, a feed inlet four 42, a gas outlet two 43, a first side line 44, a second side line 45, and a fractionation residue outlet 46; the third feeding port 41 is communicated with the first gas outlet 24, the fourth feeding port 42 is communicated with the discharge port 23, the heating furnace 3 is further arranged between the fourth feeding port 42 and the discharge port 23, and the second gas outlet 43 is sequentially connected with the cooler 5, the receiving tank 6 and the vacuum pump 7 in series through pipelines.
The working principle is as follows:
the waste lubricant oil (i.e. crude oil) after being primarily refined is heated by the heater 1, and then enters the refining reactor 2 from the first feeding port 21 of the refining reactor 2, and the organic solvent is added into the refining reactor 2 from the second feeding port 22 for solvent refining. After the crude oil is fully subjected to solvent refining, adding an alkaline additive through the second feeding hole 22, and continuously carrying out alkaline refining on the crude oil in the refining reactor 2. In the alkali refining and solvent refining processes, volatile components in the reactants are volatilized into gas and then are conveyed into the fractionating tower 4 through the first gas outlet 24.
After solvent refining and alkali refining, the crude oil is conveyed into a heating furnace 3 through a pipeline for heating, and then enters a fractionating tower 4 through a third feeding hole 41 for fractionation, first-line refined oil is separated from a first side line 44, and second-line refined oil is separated from a second side line 45. The bottoms of the column are discharged through the residue outlet 46 and sold after being mixed with the distillation tail oil. And gas-phase components at the top of the fractionating tower enter a cooler 5 through a second gas outlet 43 for cooling, condensed liquid enters a receiving tank 6, and uncondensed gas phase is discharged out of the system through a vacuum pump 7.
Example 2
A deep refining process for waste lubricating oil comprises the following steps:
(1) Carrying out primary refining on the waste lubricating oil by a conventional method to obtain crude oil;
(2) heating the crude oil to 200 ℃ by a heater 1, then feeding the crude oil into a refining reactor 2, mixing the crude oil with furfural in a mass ratio of 0.75:1, and carrying out solvent refining in the refining reactor 2. And (3) after the solvent is fully refined, adding an alkaline additive sodium hydroxide, and carrying out catalytic polymerization reaction on the crude oil refined by the solvent and the sodium hydroxide for 2 hours at normal pressure, wherein the reaction temperature is 200 ℃ to obtain the base oil.
(3) The base oil was heated in a heating furnace 3 at a temperature of 330 ℃.
(4) And (4) feeding the heated base oil obtained in the step (3) into a fractionating tower 4 for fractionation, wherein the fractionation pressure is 150Pa absolute, separating first-line refined oil through a first lateral line, and separating second-line refined oil through a second lateral line. The first-line refined oil can be used as base oil 150SN, the chroma is 0.7, and rotating oxygen nitrogen is 193 min; the second line refined oil can be used as base oil 250SN or base oil 350SN, has a chroma of 0.8 and is rotary oxygen nitrogen 191 min. Further, the residue at the bottom of the fractionating tower 4 is mixed with distillation tail oil and sold.
(5) After the gas separated from the top of the fractionating tower is cooled by a cooler 5, the condensed liquid enters a receiving tank 6, and the uncondensed gas phase is discharged out of the system by a vacuum pump 7.
Example 3
A deep refining process for waste lubricating oil comprises the following steps:
(1) carrying out primary refining on the waste lubricating oil by a conventional method to obtain crude oil;
(2) the crude oil is heated to 190 ℃ by a heater 1, then enters a refining reactor 2, is mixed with methyl pyrrolidone according to the mass ratio of 0.6:1, and is subjected to solvent refining in the refining reactor 2. And (3) after the solvent is fully refined, adding an alkaline additive sodium hydroxide, and carrying out catalytic polymerization reaction on the crude oil refined by the solvent and the sodium hydroxide for 1 hour at the normal pressure, wherein the reaction temperature is 190 ℃ to obtain the base oil.
(3) The base oil was heated in a heating furnace 3 at a temperature of 350 ℃.
(4) And (4) feeding the heated base oil obtained in the step (3) into a fractionating tower 4 for fractionation, wherein the fractionation pressure is 100Pa absolute, separating first-line refined oil through a first lateral line, and separating second-line refined oil through a second lateral line. The first-line refined oil can be used as base oil 150SN, the chroma of the first-line refined oil is 0.6, and the rotary oxygen nitrogen is 197 mim; the second line refined oil can be used as base oil 250SN or base oil 350SN, and has a chroma of 0.7 and rotational oxygen nitrogen of 193 min. Further, the residue at the bottom of the fractionating tower 4 is mixed with distillation tail oil and sold.
(5) After the gas separated from the top of the fractionating tower is cooled by a cooler 5, the condensed liquid enters a receiving tank 6, and the uncondensed gas phase is discharged out of the system by a vacuum pump 7.
Example 4
A deep refining process for waste lubricating oil comprises the following steps:
(1) the waste lubricating oil is primarily refined by a conventional method to obtain crude oil.
(2) The crude oil is heated to 220 ℃ by a heater 1, then enters a refining reactor 2, is mixed with dimethylformamide according to the mass ratio of 0.8:1, and is subjected to solvent refining in the refining reactor 2. And (3) after the solvent is fully refined, adding an alkaline additive potassium hydroxide, and carrying out catalytic polymerization reaction on the crude oil refined by the solvent and the potassium hydroxide for 1.5 hours at the normal pressure and the reaction temperature of 220 ℃ to obtain the base oil.
(3) The base oil was heated in a heating furnace 3 at 360 ℃.
(4) And (4) feeding the heated base oil obtained in the step (3) into a fractionating tower 4 for fractionation, wherein the fractionation pressure is 300Pa absolute, separating first-line refined oil through a first lateral line, and separating second-line refined oil through a second lateral line. The first-line refined oil can be used as base oil 150SN, the chroma of the first-line refined oil is 0.7, and the rotating oxygen nitrogen is 198 min; the second line refined oil can be used as base oil 250SN or base oil 350SN, has a chroma of 0.8, and is rotary oxygen nitrogen for 195 min. Further, the residue at the bottom of the fractionating tower 4 is mixed with distillation tail oil and sold.
(5) After the gas separated from the top of the fractionating tower is cooled by a cooler 5, the condensed liquid enters a receiving tank 6, and the uncondensed gas phase is discharged out of the system by a vacuum pump 7.
Example 5
A deep refining process of waste lubricating oil comprises the following steps:
(1) carrying out primary refining on the waste lubricating oil by a conventional method to obtain crude oil;
(2) heating the crude oil to 180 ℃ by a heater 1, then feeding the crude oil into a refining reactor 2, mixing the crude oil with furfural in a mass ratio of 0.7:1, and carrying out solvent refining in the refining reactor 2. And (3) after the solvent is fully refined, adding an alkaline additive calcium hydroxide, and performing catalytic polymerization reaction on the crude oil refined by the solvent and the calcium hydroxide for 1.25 hours at the normal pressure and the reaction temperature of 180 ℃ to obtain the base oil.
(3) The base oil was heated in a heating furnace 3 at 340 ℃.
(4) And (4) feeding the heated base oil obtained in the step (3) into a fractionating tower 4 for fractionation, wherein the fractionation pressure is 150Pa absolute, separating first-line refined oil through a first lateral line, and separating second-line refined oil through a second lateral line. The first-line refined oil can be used as base oil 150SN, the chroma is 0.6, and rotating oxygen nitrogen is 195 min; the second line refined oil can be used as base oil 250SN or base oil 350SN, has a chroma of 0.8 and is rotary oxygen nitrogen for 190 min. Further, the residue at the bottom of the fractionating tower 4 is mixed with distillation tail oil and sold.
(5) After the gas separated from the top of the fractionating tower is cooled by a cooler 5, the condensed liquid enters a receiving tank 6, and the uncondensed gas phase is discharged out of the system by a vacuum pump 7.
Example 6
A deep refining process for waste lubricating oil comprises the following steps:
(1) the waste lubricating oil is primarily refined by a conventional method to obtain crude oil.
(2) Heating the crude oil to 210 ℃ by a heater 1, then feeding the crude oil into a refining reactor 2, mixing the crude oil with furfural in a mass ratio of 0.7:1, and carrying out solvent refining in the refining reactor 2. And (3) after the solvent is fully refined, adding an alkaline additive sodium hydroxide, and carrying out catalytic polymerization reaction on the crude oil refined by the solvent and the sodium hydroxide for 1.75 hours at the normal pressure and the reaction temperature of 210 ℃ to obtain the base oil.
(3) The base oil was heated in a heating furnace 3 at 345 ℃.
(4) And (4) feeding the heated base oil obtained in the step (3) into a fractionating tower 4 for fractionation, wherein the fractionation pressure is 250Pa absolute, separating first-line refined oil through a first lateral line, and separating second-line refined oil through a second lateral line. The first-line refined oil can be used as base oil 150SN, the chroma is 0.6, and the rotating oxygen nitrogen is 200 min; the second line refined oil can be used as base oil 250SN or base oil 350SN, and has a chroma of 0.7 and rotational oxygen nitrogen of 193 min. Further, the residue at the bottom of the fractionating tower 4 is mixed with distillation tail oil and sold.
(5) After the gas separated from the top of the fractionating tower is cooled by a cooler 5, the condensed liquid enters a receiving tank 6, and the uncondensed gas phase is discharged out of the system by a vacuum pump 7.
In the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (4)
1. The deep refining process of the waste lubricating oil is characterized by comprising the following steps of:
(1) Pretreatment: carrying out primary refining on the waste lubricating oil by a conventional method to obtain crude oil;
(2) and (3) refining a solvent: mixing the crude oil with an organic solvent, and carrying out solvent refining to obtain crude oil subjected to solvent refining;
the organic solvent is selected from any one of furfural, methyl pyrrolidone or dimethylformamide;
(3) alkali refining: fully mixing the crude oil refined by the solvent with an alkaline additive, and carrying out catalytic polymerization at the temperature of 180-220 ℃ for 1-2h to obtain base oil;
the alkaline additive is any one or combination of more of sodium hydroxide, potassium hydroxide and calcium hydroxide; the addition amount of the alkaline additive is 0.5-1.5 wt%;
(4) fractional distillation: fractionating the base oil at 250-350 ℃ to obtain first-line lubricating oil and second-line lubricating oil;
(5) and (3) post-treatment: and mixing the fractionation residue with distillation tail oil, and selling as a product.
2. The deep refining process of the waste lubricating oil according to claim 1, wherein the mass ratio of the organic solvent to the crude oil in the step (2) is (0.6-0.8): 1.
3. The process as claimed in claim 1, wherein the fractionation pressure in step (4) is 100-300Pa absolute.
4. The deep refining process system for waste lubricating oil according to any one of claims 1 to 3, characterized by comprising a heater, a refining reactor, a heating furnace, a fractionating tower, a cooler, a receiving tank and a vacuum pump;
the refining reactor comprises a first feeding hole, a second feeding hole, a discharging hole and a first gas outlet; the first feeding hole is connected with the heater;
the fractionating tower comprises a third feeding hole, a fourth feeding hole, a second gas outlet, a first lateral line, a second lateral line and a fractionating residue outlet;
the feed inlet III is communicated with the air outlet I; and the gas outlet II is sequentially connected with the cooler, the receiving tank and the vacuum pump in series through pipelines, one end of the heating furnace is connected with the feed inlet IV, and the other end of the heating furnace is connected with the discharge hole.
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| CN103351939A (en) * | 2013-06-28 | 2013-10-16 | 姜皓 | Refine and regeneration method of waste lubricant oil and regeneration device thereof |
| CN108485791A (en) * | 2018-05-17 | 2018-09-04 | 濮阳市盛源石油化工（集团）有限公司 | A kind of decoloration of environment-friendly type waste lubricating oil de-tastes regeneration technology |
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