CN107384569B - Method for continuously recycling waste lubricating oil without pollution - Google Patents
Method for continuously recycling waste lubricating oil without pollution Download PDFInfo
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- CN107384569B CN107384569B CN201710545701.7A CN201710545701A CN107384569B CN 107384569 B CN107384569 B CN 107384569B CN 201710545701 A CN201710545701 A CN 201710545701A CN 107384569 B CN107384569 B CN 107384569B
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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
- C10M175/0041—Working-up used lubricants to recover useful products ; Cleaning by thermal processes by hydrogenation 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
- C10M175/0083—Lubricating greases
Abstract
The invention relates to the field of waste oil recycling, in particular to a method for continuously recycling waste lubricating oil without pollution. The waste lubricating oil is flocculated and squeezed by a closed continuous screw extruder combined with a homogenizer, so that not only are colloidal substances, fine particles and the like separated, but also water and light oil in the waste lubricating oil are separated and recovered. The molecular bond of the waste lubricating oil is burst under the conditions of high pressure and high temperature by utilizing a closed tubular homogenizing valve and an auxiliary active agent, and the small molecular lubricating oil and hydrogen are subjected to hydrogenation reaction in an unstable state to obtain a hydrogenation mixture. And further removing by-products and decoloring by using a small amount of argil to obtain the high-quality lubricating oil. The method has the advantages of short and controllable process, continuous production, and no secondary pollution. And the lubricating grease and impurities are thoroughly separated by a squeezing technology, the recovery rate is high, and the method has important significance for ecological environmental protection.
Description
Technical Field
The invention relates to the field of waste oil recycling, in particular to a method for continuously recycling waste lubricating oil without pollution.
Background
The lubricating grease is a lubricating oil which is separated from petroleum and synthesized by hydrogenation, sulfonation, solvent extraction separation method and the like, is mainly used for reducing friction between surfaces of moving parts, and has cooling and sealing functions on machinery and equipment. The lubricating oil is widely applied to lubrication and transmission lubrication of industrial machinery, such as machine tool transmission machinery, textile machinery, hoisting machinery, transportation machinery and other equipment. When the lubricating grease is used, the working temperature is generally below 200 ℃, polar substances in the lubricating grease are decomposed on the metal surface of a friction part under the action of tribochemical action under high temperature and high load and undergo tribochemical reaction with surface metal to form a soft extreme pressure film with a low melting point and a firm physicochemical adsorption film, so that the lubricating grease has the functions of resisting high load and resisting frictional wear.
With the rapid development of the automobile industry and the machinery industry, the demand of lubricating oil is increasing rapidly. The frequency of oil changes for vehicles, machinery, etc. is increasing, and a large amount of waste oil is produced. 6000-8000 kt of waste lubricating oil is produced at home every day, a large amount of waste oil is abandoned or burnt, soil, water resources and the like are polluted, and resource waste is also caused. Only a small amount of waste oil is recycled by the methods of repurification, re-refining and re-refining. In the waste lubricating oil, only a small part of hydrocarbons are really deteriorated, so that the aim of regenerating and recycling the waste lubricating oil can be achieved by only taking measures to remove or reduce the deteriorated hydrocarbons, and the method has important significance for relieving the shortage of petroleum resources and reducing the pollution of the waste oil to the environment
Because the requirement of high-speed operation of machinery is higher and higher, basic lubricating oil is difficult to meet the requirement, and a dispersant, an antioxidant, an extreme pressure antiwear agent, a friction modifier, a metal deactivator, a viscosity index improver, an antirust agent and the like are usually added into the basic lubricating oil. Therefore, in the used lubricating oil, there are mainly deteriorated hydrocarbons and additive-ineffective impurities caused by temperature, extreme pressure, and the like. How to remove impurities in the waste lubricating oil is the key to realizing the recycling of the waste lubricating oil.
The existing waste lubricating oil recovery has more ways. Although the sulfuric acid-clay method can produce qualified base oil, the acid sludge causes serious secondary pollution to the environment; the solvent refining process does not use sulfuric acid, has little pollution and high yield, but has high requirement on the solvent, belongs to selective recovery and has complex process, and the solvent needs to be recovered and treated again, so the cost is high; the quality of the oil recovered by the distillation process and the supercritical extraction process is good, but the requirement on the regeneration of the waste lubricating oil is high, and the direct heating often causes the cracking of lubricating oil molecules due to local overheating in the distillation process; the membrane separation process has the characteristics of low operation condition, high separation efficiency, low energy consumption, environmental friendliness and the like in the waste lubricating oil, but has the problems of low yield and high membrane requirement.
The Chinese patent application No. 201310207519.2 discloses a regeneration method of waste lubricating oil, which is to put the waste lubricating oil into a settling tank for simple separation; taking the upper layer oil-containing mixture, adding the mixture into a blending tank, and heating for flocculation; transferring the flocculated mixture into a normal pressure distillation tower for distillation, distilling the mixture through a flash tower and a reduced pressure evaporator, and then rectifying the mixture in a rectifying tower; and treating the rectified lubricating oil with argil, and filtering to obtain the base oil. Obviously, the process needs to add a large amount of clay, and secondary pollution of acid sludge is generated.
Many existing factories desire to recycle the waste lubricating oil, but existing processing equipment has low recycling efficiency, small processing amount and pollution phenomenon. In view of the above, it is very important to the sustainable development of lubricating oil to research a continuous, pollution-free, efficient and low-cost waste lubricating oil recycling and regenerating technology.
Disclosure of Invention
In order to overcome the defects of secondary pollution, low recovery efficiency and difficult continuous and stable high-quality recovery of the conventional waste lubricating oil, the invention provides a method for continuously and pollution-free regeneration and recovery of the waste lubricating oil. Further under the continuous condition, the grease molecules are activated in an unstable state through the assistance of a homogenizing valve and an activating agent, so that the hydrogenation is performed rapidly, and the quality of the obtained recovered lubricating grease is greatly improved. The method provides a technical support for continuously recycling the regenerated waste lubricating oil with no pollution, high efficiency and low cost. Has good practical value.
In order to realize the purpose, the invention adopts the following technical scheme:
a method for continuously regenerating and recycling waste lubricating oil without pollution is characterized in that a screw extruder is combined with a homogenizing valve to continuously and hermetically remove impurities and hydrogenate the waste lubricating oil, and the preparation method comprises the following steps:
1) heating the waste lubricating oil to 60-80 ℃, and performing pre-filtration to remove large-particle impurities to obtain pre-treated waste lubricating oil;
2) adding a flocculating agent into the pretreated waste lubricating oil obtained in the step 1), uniformly stirring, collecting colloidal substances and fine particulate matters in the waste lubricating oil by the flocculating agent to form flocculates, and then conveying the flocculates into a first-stage screw extruder for primary squeezing to remove the flocculates in the form of waste residues to obtain primary squeezing liquid; the screw extruder is provided with a vacuum port, water and light oil discharged by volatile components are collected, and primary squeezed liquid automatically flows into the tubular homogenizing valve;
3) continuously feeding the primary squeezed liquid obtained in the step 2) into a closed tubular homogenizing valve, introducing nitrogen with the pressure of 1-2MPa into the tubular homogenizing valve, heating to 150-200 ℃, introducing an active agent with the mass of 0.5-1% of that of the squeezed liquid and excessive hydrogen, and under the action of high pressure and the active agent, cracking molecular bonds of the primary squeezed liquid, and performing hydrogenation reaction on the unstable state of small molecules and the hydrogen to obtain a hydrogenation mixture; the active agent is at least one of oleylamine acetate, sodium oleate, sodium sulfosuccinate and polyethylene glycol oleate;
4) and 3) discharging the hydrogenated mixture obtained in the step 3) from an outlet of the closed tubular homogenizing valve, continuously feeding the hydrogenated mixture into a second-stage screw extruder, simultaneously adding argil, performing secondary pressing by using the second-stage screw extruder, and pressing the argil adsorbing chlorine, nitrogen, sulfur and acid to discharge the argil in a waste residue form to obtain secondary pressing liquid, namely recovered lubricating oil.
Preferably, the flocculant in step 2) is at least one of wood fiber, aluminum hydroxide and gel starch. The usage amount of the flocculating agent is 3-5% of the mass of the pretreated waste lubricating oil. The flocculating agent is used for flocculating the fine particles and the colloidal state in the waste lubricating oil to form large connected floccules so as to be beneficial to separating from the lubricating oil through pressing.
Preferably, step 2) the first-stage screw extruder is provided with a vacuum port on the front end screw cylinder, is connected with a condenser and is used for collecting volatile water and light oil, and the upper part of the rear end screw cylinder is provided with a filter screen, so that the first-stage squeezing liquid continuously and naturally flows out from the upper part.
Preferably, the tubular homogenizing valve in step 3) is a pressure-resistant thin tube with an inner diameter of 3-5mm and a length of 2-3 m.
The invention relates to a method for continuously regenerating and recycling waste lubricating oil without pollution, which is characterized in that a closed continuous screw extruder is combined with a homogenizer to flocculate and squeeze the waste lubricating oil, so that colloid substances, fine particles and the like are separated, and water and light oil in the waste lubricating oil are separated and recycled. The molecular bond of the waste lubricating oil is burst under the conditions of high pressure and high temperature by utilizing a closed tubular homogenizing valve and an auxiliary active agent, and the small molecular lubricating oil and hydrogen are subjected to hydrogenation reaction in an unstable state to obtain a hydrogenation mixture. And further removing by-products and decoloring by using a small amount of argil to obtain the high-quality lubricating oil. The method has the advantages of short and controllable process, continuous production, and no secondary pollution. And the lubricating grease and impurities are thoroughly separated by a squeezing technology, and the recovery rate is high.
Compared with the prior art, the method for continuously regenerating and recycling the waste lubricating oil without pollution has the outstanding characteristics and beneficial effects that:
1. the invention relates to a method for continuously regenerating and recycling waste lubricating oil without pollution, which is characterized in that a closed continuous screw extruder is combined with a homogenizer to flocculate and squeeze the waste lubricating oil, so that colloid substances, fine particles and the like are separated, water and light oil in the waste lubricating oil are separated and recycled, the quality of the recycled lubricating oil is improved by hydrogenation, and the economic benefit is increased.
2. The method for continuously regenerating and recycling the waste lubricating oil without pollution ensures that the lubricating grease and impurities are thoroughly separated by squeezing, the recycling rate is high, secondary pollution is avoided, and the production environment is favorably improved.
3. The invention relates to a method for continuously regenerating and recycling waste lubricating oil without pollution, which belongs to closed pollution-free production, has stable process and low equipment requirement and is suitable for recycling waste lubricating oil in batches on a large scale.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments, but it should not be construed that the scope of the present invention is limited to the following examples. Various substitutions and alterations can be made by those skilled in the art and by conventional means without departing from the spirit of the method of the invention described above.
Example 1
A method for continuously regenerating and recycling waste lubricating oil without pollution is characterized in that a screw extruder is combined with a homogenizing valve to continuously and hermetically remove impurities and hydrogenate the waste lubricating oil, and the preparation method comprises the following steps:
1) heating the waste lubricating oil to 60-80 ℃, and performing pre-filtration to remove impurities such as large-particle sand stones and the like to obtain pre-treated waste lubricating oil;
2) adding wood fiber serving as a flocculating agent into the pretreated waste lubricating oil obtained in the step 1), wherein the using amount of the wood fiber is 3% of the mass of the pretreated waste lubricating oil, uniformly stirring, collecting colloidal substances and fine particles in the waste lubricating oil by the flocculating agent to form large continuous flocculates, then sending the flocculates into a first-stage screw extruder for first-stage pressing, arranging a vacuum port on a front end screw cylinder of the first-stage screw extruder, connecting the vacuum port with a condenser, collecting volatile water and light oil, arranging a filter screen on the upper part of a rear end screw cylinder, enabling first-stage pressing liquid to continuously and naturally flow out from the upper part of the rear end screw cylinder, enabling the flocculates to be discharged in a waste residue form, and automatically flowing into a tubular homogenizing;
3) continuously feeding the primary squeezed liquid obtained in the step 2) into a closed tubular homogenizing valve, wherein the tubular homogenizing valve is a pressure-resistant thin tube with the inner diameter of 3mm and the length of 2m, nitrogen with the pressure of 1MPa is introduced into the tubular homogenizing valve, the tubular homogenizing valve is heated to 150 ℃, an active agent oleylamine acetate with the mass of 0.5% of that of the squeezed liquid and excessive hydrogen are introduced, under the action of high pressure and the active agent, molecular bonds of the primary squeezed liquid burst, and micromolecular grease is in an unstable state and performs hydrogenation reaction with the hydrogen to obtain a hydrogenation mixture;
4) and 3) discharging the hydrogenated mixture obtained in the step 3) from an outlet of the closed tubular homogenizing valve, continuously feeding the hydrogenated mixture into a second-stage screw extruder, simultaneously adding argil, performing secondary pressing by using the second-stage screw extruder, and pressing the argil adsorbing chlorine, nitrogen, sulfur and acid to discharge the argil in a waste residue form to obtain secondary pressing liquid, namely recovered lubricating oil.
The technique for producing the reclaimed and regenerated lubricating oil obtained in example 1 was analyzed by tests for the effect of use.
The comparative sample was a commercially available lubricating oil for a shell car.
Abrasion resistance test conditions: 1200r/min, load 294N, time 30min, four ball tester.
The test performance is shown in table 1, and the regeneration technology of the lubricating oil of example 1 has high yield, and the flash point, the viscosity and the abrasion resistance are basically consistent with the performance of the commercial lubricating oil.
Example 2
A method for continuously regenerating and recycling waste lubricating oil without pollution is characterized in that a screw extruder is combined with a homogenizing valve to continuously and hermetically remove impurities and hydrogenate the waste lubricating oil, and the preparation method comprises the following steps:
1) heating the waste lubricating oil to 60-80 ℃, and performing pre-filtration to remove large-particle impurities to obtain pre-treated waste lubricating oil;
2) adding aluminum hydroxide serving as a flocculating agent into the pretreated waste lubricating oil obtained in the step 1), wherein the using amount of the flocculating agent is 5% of the mass of the pretreated waste lubricating oil, uniformly stirring, collecting colloidal substances and fine particles in the waste lubricating oil by the flocculating agent to form flocculates, then conveying the flocculates into a first-stage screw extruder for first-stage pressing, arranging a vacuum port on a front screw cylinder of the first-stage screw extruder, connecting the vacuum port with a condenser, collecting volatile water and light oil, and arranging a filter screen on the upper part of a rear screw cylinder to enable first-stage pressing liquid to continuously and naturally flow out of the upper part of the first-stage screw extruder; flocculate is discharged in the form of waste residue, and the primary squeezed liquid automatically flows into the tubular homogenizing valve;
3) continuously feeding the primary squeezed liquid obtained in the step 2) into a closed tubular homogenizing valve, introducing nitrogen with the pressure of 1.5MPa into the tubular homogenizing valve, heating to 180 ℃, introducing an active agent sodium oleate and excessive hydrogen with the mass of 0.5% of that of the squeezed liquid, cracking molecular bonds of the primary squeezed liquid under the action of high pressure and the active agent, and carrying out hydrogenation reaction on the unstable state of small molecules and the hydrogen to obtain a hydrogenation mixture;
4) and 3) discharging the hydrogenated mixture obtained in the step 3) from an outlet of the closed tubular homogenizing valve, continuously feeding the hydrogenated mixture into a second-stage screw extruder, simultaneously adding argil, performing secondary pressing by using the second-stage screw extruder, and pressing the argil adsorbing chlorine, nitrogen, sulfur and acid to discharge the argil in a waste residue form to obtain secondary pressing liquid, namely recovered lubricating oil.
The technique for producing the reclaimed and regenerated lubricating oil obtained in example 2 was analyzed by tests for the effect of use.
The comparative sample was a commercially available lubricating oil for a shell car.
Abrasion resistance test conditions: 1200r/min, load 294N, time 30min, four ball tester.
The test performance is shown in table 1, and the regeneration technology of the lubricating oil of the example 2 has high yield, and the flash point, the viscosity and the abrasion resistance are basically consistent with the performance of the commercial lubricating oil.
Example 3
A method for continuously regenerating and recycling waste lubricating oil without pollution is characterized in that a screw extruder is combined with a homogenizing valve to continuously and hermetically remove impurities and hydrogenate the waste lubricating oil, and the preparation method comprises the following steps:
1) heating the waste lubricating oil to 60-80 ℃, and performing pre-filtration to remove large-particle impurities to obtain pre-treated waste lubricating oil;
2) adding a flocculating agent into the pretreated waste lubricating oil obtained in the step 1), wherein the using amount of the flocculating agent is 3% of the mass of the pretreated waste lubricating oil, uniformly stirring, collecting colloidal substances and fine particles in the waste lubricating oil by the flocculating agent to form flocculates, then sending the flocculates into a first-stage screw extruder for first-stage pressing, wherein a vacuum port is arranged on a front screw cylinder of the first-stage screw extruder, the first-stage screw extruder is connected with a condenser and is used for collecting volatile water and light oil, a filter screen is arranged on the upper part of a rear screw cylinder, so that first-stage pressing liquid continuously and naturally flows out from the upper part, the flocculates are discharged in a waste residue form, and the first-stage pressing;
3) continuously feeding the primary squeezed liquid obtained in the step 2) into a closed tubular homogenizing valve, introducing nitrogen with the pressure of 2MPa into the tubular homogenizing valve, heating to 200 ℃, introducing an active agent sodium sulfosuccinate with the mass of 1% of that of the squeezed liquid and excessive hydrogen, and under the action of high pressure and the active agent, cracking molecular bonds of the primary squeezed liquid, and performing hydrogenation reaction on unstable small molecules and the hydrogen to obtain a hydrogenation mixture;
4) and 3) discharging the hydrogenated mixture obtained in the step 3) from an outlet of the closed tubular homogenizing valve, continuously feeding the hydrogenated mixture into a second-stage screw extruder, simultaneously adding argil, performing secondary pressing by using the second-stage screw extruder, and pressing the argil adsorbing chlorine, nitrogen, sulfur and acid to discharge the argil in a waste residue form to obtain secondary pressing liquid, namely recovered lubricating oil.
The technique for producing the reclaimed and regenerated lubricating oil obtained in example 3 was analyzed by tests for the effect of use.
The comparative sample was a commercially available lubricating oil for a shell car.
Abrasion resistance test conditions: 1200r/min, load 294N, time 30min, four ball tester.
The test performance is shown in table 1, and the regeneration technology of the lubricating oil of the example 3 has high yield, and the flash point, the viscosity and the abrasion resistance are basically consistent with the performance of the commercial lubricating oil.
Example 4
A method for continuously regenerating and recycling waste lubricating oil without pollution is characterized in that a screw extruder is combined with a homogenizing valve to continuously and hermetically remove impurities and hydrogenate the waste lubricating oil, and the preparation method comprises the following steps:
1) heating the waste lubricating oil to 60-80 ℃, and performing pre-filtration to remove large-particle impurities to obtain pre-treated waste lubricating oil;
2) adding wood fiber serving as a flocculating agent into the pretreated waste lubricating oil obtained in the step 1), uniformly stirring, collecting colloidal substances and fine particulate matters in the waste lubricating oil by the flocculating agent to form flocculates, and then conveying the flocculates into a first-stage screw extruder for primary squeezing to remove the flocculates in the form of waste residues to obtain primary squeezing liquid, wherein the using amount of the flocculating agent is 5% of the mass of the pretreated waste lubricating oil; the screw extruder is provided with a vacuum port, water and light oil discharged by volatile components are collected, and primary squeezed liquid automatically flows into the tubular homogenizing valve;
3) continuously feeding the primary squeezed liquid obtained in the step 2) into a closed tubular homogenizing valve, introducing nitrogen with the pressure of 2MPa into the tubular homogenizing valve, heating to 150 ℃, introducing an active agent ethylene glycol oleate with the mass of 0.5% of that of the squeezed liquid and excessive hydrogen, and under the action of high pressure and the active agent, cracking molecular bonds of the primary squeezed liquid, so that the unstable state of small molecules and hydrogen are subjected to hydrogenation reaction to obtain a hydrogenation mixture;
4) and 3) discharging the hydrogenated mixture obtained in the step 3) from an outlet of the closed tubular homogenizing valve, continuously feeding the hydrogenated mixture into a second-stage screw extruder, simultaneously adding argil, performing secondary pressing by using the second-stage screw extruder, and pressing the argil adsorbing chlorine, nitrogen, sulfur and acid to discharge the argil in a waste residue form to obtain secondary pressing liquid, namely recovered lubricating oil.
The technique for producing the reclaimed and regenerated lubricating oil obtained in example 4 was analyzed by tests for the effect of use.
The comparative sample was a commercially available lubricating oil for a shell car.
Abrasion resistance test conditions: 1200r/min, load 294N, time 30min, four ball tester.
The test performance is shown in table 1, and the regeneration technology of the lubricating oil of example 4 has high yield, and the flash point, the viscosity and the abrasion resistance are basically consistent with the performance of the commercial lubricating oil.
Table 1:
| test items | Sample 1 | Example 1 | Example 2 | Example 3 | Example 4 |
| Yield (%) | —— | 87 | 85 | 84 | 86 |
| Flash point (open, DEG C) | 238 | 235 | 228 | 226 | 225 |
| Viscosity (50 ℃, mm 2/s) | 38 | 39 | 42 | 41 | 43 |
| Peroxide number (mmol/kg) | 19.2 | 18.8 | 20.1 | 20.6 | 19.8 |
| Antiwear (Steel ball grinding diameter) | 0.45 | 0.60mm | 0.58mm | 0.62mm | 0.64mm |
Claims (3)
1. A method for continuously regenerating and recycling waste lubricating oil without pollution is characterized in that a screw extruder is combined with a homogenizing valve to continuously and hermetically remove impurities and hydrogenate the waste lubricating oil, and the preparation method comprises the following steps:
1) heating the waste lubricating oil to 60-80 ℃, and performing pre-filtration to remove large-particle impurities to obtain pre-treated waste lubricating oil;
2) adding a flocculating agent into the pretreated waste lubricating oil obtained in the step 1), uniformly stirring, collecting colloidal substances and fine particulate matters in the waste lubricating oil by the flocculating agent to form flocculates, and then conveying the flocculates into a first-stage screw extruder for primary squeezing to remove the flocculates in the form of waste residues to obtain primary squeezing liquid; the screw extruder is provided with a vacuum port, water and light oil discharged by volatile components are collected, and primary squeezed liquid automatically flows into the tubular homogenizing valve; the flocculant is at least one of wood fiber, aluminum hydroxide and gel starch, and the usage amount of the flocculant is 3-5% of the mass of the pretreated waste lubricating oil;
3) continuously feeding the primary squeezed liquid obtained in the step 2) into a closed tubular homogenizing valve, introducing nitrogen with the pressure of 1-2MPa into the tubular homogenizing valve, heating to 150-200 ℃, introducing an active agent with the mass of 0.5-1% of that of the squeezed liquid and excessive hydrogen, and under the action of high pressure and the active agent, cracking molecular bonds of the primary squeezed liquid, and performing hydrogenation reaction on the unstable state of small molecules and the hydrogen to obtain a hydrogenation mixture; the active agent is at least one of oleylamine acetate, sodium oleate, sodium sulfosuccinate and polyethylene glycol oleate;
4) and 3) discharging the hydrogenated mixture obtained in the step 3) from an outlet of the closed tubular homogenizing valve, continuously feeding the hydrogenated mixture into a second-stage screw extruder, simultaneously adding argil, performing secondary pressing by using the second-stage screw extruder, and pressing the argil adsorbing chlorine, nitrogen, sulfur and acid to discharge the argil in a waste residue form to obtain secondary pressing liquid, namely recovered lubricating oil.
2. The method for continuously and pollution-free regenerating and recycling the used lubricating oil according to claim 1, wherein: and 2) the first-stage screw extruder is provided with a vacuum port on the front end screw cylinder, is connected with a condenser and is used for collecting volatile water and light oil, and the upper part of the rear end screw cylinder is provided with a filter screen so that the first-stage squeezed liquid continuously and naturally flows out of the upper part of the rear end screw cylinder.
3. The method for continuously and pollution-free regenerating and recycling the used lubricating oil according to claim 1, wherein: the tubular homogenizing valve in the step 3) is a pressure-resistant thin tube with the inner diameter of 3-5mm and the length of 2-3 m.
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