CN114177655B - Fiber separation type saturated oil separation recovery device and method for base oil solvent extraction extract liquid - Google Patents
Fiber separation type saturated oil separation recovery device and method for base oil solvent extraction extract liquid Download PDFInfo
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- CN114177655B CN114177655B CN202111588676.3A CN202111588676A CN114177655B CN 114177655 B CN114177655 B CN 114177655B CN 202111588676 A CN202111588676 A CN 202111588676A CN 114177655 B CN114177655 B CN 114177655B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D11/00—Solvent extraction
- B01D11/04—Solvent extraction of solutions which are liquid
- B01D11/0488—Flow sheets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D11/00—Solvent extraction
- B01D11/04—Solvent extraction of solutions which are liquid
- B01D11/0492—Applications, solvents used
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
- B01D17/005—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion by thermal diffusion
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
- B01D17/02—Separation of non-miscible liquids
- B01D17/0202—Separation of non-miscible liquids by ab- or adsorption
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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
- C10M175/005—Working-up used lubricants to recover useful products ; Cleaning using extraction processes; apparatus 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
- Y02P70/62—Manufacturing or production processes characterised by the final manufactured product related technologies for production or treatment of textile or flexible materials or products thereof, including footwear
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Abstract
The invention discloses a fiber separation type saturated oil separation recovery device and method for base oil solvent extraction extract, the device comprises a cooler and a fiber separator which are sequentially connected, the fiber separator comprises a shell, a liquid inlet, a liquid outlet, an air inlet and an oil removal port which can be controlled to be opened and closed are arranged on the shell, the liquid inlet is connected with the cooler, the air inlet is used for introducing hot gas, the oil removal port is used for discharging saturated oil separation, fiber yarns are filled in the shell, and meanwhile, an extrusion plate used for extruding the fiber yarns is arranged. The method adopts a cooling means to reduce the solubility and selectively increase the selectivity of the NMP solvent, so that the saturated oil fraction contained in the extract is released from the NMP solvent, and then adopts a fiber separation technology to make the saturated oil fraction adsorb and swell the cellosilk, and the NMP solvent and the unsaturated oil fraction are discharged, thereby realizing the separation of the saturated oil fraction, avoiding the loss of the base oil and improving the overall yield of the base oil; the whole process has good stability, low operation cost and high efficiency.
Description
Technical Field
The invention relates to the technical field of waste lubricating oil treatment, in particular to a fiber separation type saturated oil separation recovery device and method for base oil solvent extraction extract.
Background
The lubricating oil is composed of base oil and a certain amount of additives, and after the lubricating oil is used for a period of time, the normal function of the lubricating oil is lost due to the introduction of impurities, the deterioration of the additives and the like, so that the lubricating oil becomes waste lubricating oil. The waste lubricating oil contains saturated oil (light component base oil, for reason component) and unsaturated oil, and also contains impurities such as oil sludge, metal microparticles, carbon black, moisture, additives and degradation products.
With the development of technology and the improvement of environmental protection requirements, the waste lubricating oil can be treated to obtain regenerated base oil, the main process comprises distillation and extraction, the waste lubricating oil is subjected to atmospheric or reduced pressure distillation to obtain distillate oil, then a polar solvent NMP (N-Methyl pyrrolidone) is used for carrying out tower-in-tower extraction on the distillate oil, more than 90% of raffinate obtained at the top of the tower after extraction is base oil, and simultaneously the raffinate obtained at the bottom of the tower after extraction contains less than 10% of NMP solvent, 90% of extract obtained at the bottom of the tower after extraction is NMP solvent, and 10% of extract is oil (5-7% saturated partial oil and 3-5% unsaturated partial oil). Among them, saturated separated oil is an ideal component of base oil, and if the extraction liquid is directly treated to recover the NMP solvent, the loss of the base oil is caused, so that the yield of the base oil is reduced. Therefore, we need to devise a way to separate 5-7% of the saturated partial oil contained in the extract to increase the yield of base oil. Normally, unsaturated oil is highly polar and is completely dissolved in the NMP solvent, while saturated oil is also polar and is also dissolved in the NMP solvent, so that the saturated oil cannot be separated by a separation device.
Additionally, the NMP solvent will select the more polar species, for example, the more polar unsaturated fraction will preferentially dissolve. However, the recent research shows that the solubility of the NMP solvent is improved along with the increase of the temperature, so that substances with weaker polarity can be dissolved, the corresponding selectivity is reduced, and conversely, the solubility of the NMP solvent is reduced along with the decrease of the temperature, substances with weaker polarity are separated out, and the selectivity is improved. Therefore, the separation treatment of saturated oil can be carried out according to the characteristics.
Disclosure of Invention
The invention aims to provide a fiber separation type saturated oil separation recovery device and method for base oil solvent extraction extract, which solve the problem that saturated oil separation contained in the extract cannot be separated by utilizing the characteristic that the solubility and selectivity of an NMP solvent are changed under the influence of temperature.
The invention achieves the above purpose through the following technical scheme:
the utility model provides a fiber separation formula saturation of base oil solvent extraction extract liquid divides oil recovery unit, a serial communication port, recovery unit connects in the extract liquid export of base oil solvent extraction unit, and recovery unit is including the cooler and the defibrator that connect gradually, the defibrator includes the casing, be equipped with the inlet, liquid outlet, the air inlet of steerable switching on and off on the casing and take off the hydraulic fluid port, the inlet is used for connecting the cooler, the air inlet is used for letting in steam, it is used for the exhaust saturation to divide oil to take off the hydraulic fluid port, the inside packing of casing has the cellosilk, is equipped with the stripper plate that is used for extruding the cellosilk simultaneously.
The further improvement lies in that through holes are distributed on the extrusion plate.
The further improvement lies in that the extrusion plate is connected with a driving piece for driving the extrusion plate to extrude.
In a further improvement, the surface tension of the fiber filaments is the same or similar to the surface tension of the saturated oil fraction in the extraction solution.
The invention also provides a fiber separation type saturated oil separation recovery method of the base oil solvent extraction extract, which utilizes the recovery device and comprises the following specific steps:
the method comprises the following steps: introducing the extract into a cooler for cooling, so that the solubility and selectivity of the NMP solvent in the extract are reduced, and saturated oil in the extract is released from the NMP solvent;
step two: and then controlling to open a liquid inlet and a liquid outlet of the fiber separator, closing an air inlet and an oil removing port, introducing the cooled and cooled extract into the fiber separator from the liquid inlet, adsorbing saturated oil in the extract to the surface of the fiber through the adsorption action of the fiber, wetting the fiber, and discharging the NMP solvent and the dissolved unsaturated oil in the extract from the liquid outlet, thereby completing the separation and recovery of the saturated oil.
The improved structure is characterized in that the fiber yarns are gradually swelled along with the increase of the adsorption capacity of the saturated oil on the fiber yarns, so that channels between the fiber yarns are blocked, the liquid inlet and the liquid outlet are closed at the moment, the oil removing port is opened, the extrusion plate is driven to extrude the fiber yarns, the saturated oil adsorbed on the swollen fiber yarns is discharged from the oil removing port, after the fiber yarns are fully extruded, the air inlet is opened again, hot air is blown in, the residual saturated oil is further discharged, and the fiber yarns are blown away.
The further improvement is that the cooler is internally circulated with chilled water at the temperature of-10-0 ℃.
The further improvement is that the temperature of the extract liquid is reduced from 50-60 ℃ to 5-15 ℃ through the cooling treatment in the first step.
The further improvement is that in the second step, the weight of the unsaturated partial oil discharged from the liquid outlet accounts for 3-5% of the weight of the initial extract.
The invention has the beneficial effects that: the method adopts a cooling means to reduce the solubility and selectively increase the selectivity of the NMP solvent, so that the saturated separated oil contained in the extract is released from the NMP solvent, and then adopts a fiber separation technology to make the saturated separated oil adsorb and swell the cellosilk, and the NMP solvent and the unsaturated separated oil are discharged, thereby realizing the separation of the saturated separated oil, avoiding the loss of the base oil and improving the overall yield of the base oil; the whole process has the advantages of good stability, low operation cost and high efficiency.
Drawings
FIG. 1 is a schematic structural diagram of a fiber separation type saturated oil separation recovery device for a base oil solvent extraction extract;
FIG. 2 is a schematic view of the structure of the fiber separator;
in the figure: 1. a base oil solvent extraction unit; 2. a cooler; 3. a fiber separator; 301. a liquid inlet; 302. a liquid outlet; 303. an air inlet; 304. an oil removing port; 305. fiber yarn; 306. a pressing plate; 307. a drive member.
Detailed Description
The present application will now be described in further detail with reference to the drawings, it should be noted that the following detailed description is given for illustrative purposes only and is not to be construed as limiting the scope of the present application, as those skilled in the art will be able to make numerous insubstantial modifications and adaptations to the present application based on the above disclosure.
As shown in fig. 1 and fig. 2, a fiber separation type saturated oil separation recovery device for base oil solvent extraction extract, which is characterized in that the recovery device is connected to an extract outlet of a base oil solvent extraction device 1, the recovery device comprises a cooler 2 and a fiber separator 3 which are connected in sequence, the fiber separator 3 comprises a shell, the shell is provided with a liquid inlet 301, a liquid outlet 302, a gas inlet 303 and an oil removal port 304 which can be controlled to be opened and closed, the liquid inlet 301 is used for connecting the cooler 2, the gas inlet 303 is used for introducing hot gas, the oil removal port 304 is used for discharging saturated oil separation, the shell is filled with fiber filaments 305, and meanwhile, the shell is provided with an extrusion plate 306 for extruding the fiber filaments 305.
The adopted base oil solvent extraction device 1 can adopt a section of extraction device, only one extraction tower is needed when the extraction device is adopted for one section, the top of the extraction tower is provided with a raffinate outlet, and the bottom of the extraction tower is provided with an extract outlet.
Preferably, the above-mentioned base oil solvent extraction device 1 that adopts also can adopt two-stage extraction device, when adopting two-stage: including cyclone, extraction tower and static mixer, cyclone's lateral wall is equipped with the feed inlet, the top is equipped with raffinate export, the bottom is equipped with extract liquid export, the lateral wall hypomere of extraction tower is equipped with raffinate import once, the lateral wall upper segment is equipped with the NMP import, the top is equipped with secondary raffinate export, the bottom is equipped with secondary extract liquid export, static mixer's entry end is used for leading-in distillate oil, static mixer's export section passes through pipe connection in feed inlet, raffinate export passes through the pipeline and is connected with raffinate import once, secondary extract liquid export is connected through the pipeline of taking the liquid pump and static mixer's entry end. During extraction, distilled distillate oil is conveyed to a static mixer and then conveyed to a cyclone separator for primary extraction, obtained primary extract liquid is discharged, obtained primary raffinate liquid is conveyed to the bottom of an extraction tower, meanwhile, a new NMP solvent is input to the top of the extraction tower, the NMP solvent is in reverse contact with the primary raffinate liquid for secondary extraction, obtained secondary raffinate liquid is discharged, the extraction process is completed, obtained secondary extract liquid is conveyed to the static mixer, is uniformly mixed with the distillate oil and then conveyed to the cyclone separator, secondary extract liquid is used as an extraction solvent for primary extraction, oil agent layering is realized after primary extraction, an oil phase rises to form primary raffinate liquid, and an agent phase falls to form primary extract liquid. The primary extract from the cyclone separator was fed to the recovery apparatus of the present invention, wherein 90% was NMP solvent and 10% was oil (5-7% saturated fraction oil, 3-5% unsaturated fraction oil).
In the present invention, through holes are distributed on the pressing plate 306 for the passage of liquid during pressing. The extrusion plate 306 is connected with a driving member 307 for driving the extrusion plate 307 to extrude, and the driving member 307 may be an electric telescopic rod or an air cylinder, or may be manually driven.
The invention also provides a fiber separation type saturated oil separation recovery method of the base oil solvent extraction extract, which utilizes the recovery device and comprises the following specific steps:
the method comprises the following steps: cooling the extract in cooler 2 with-10-0 deg.C chilled water, preferably-5 deg.C, to lower the temperature of the extract from 50-60 deg.C to 5-15 deg.C, preferably-10 deg.C, and further lower the solubility and selectivity of NMP solvent in the extract, so as to release saturated oil from NMP solvent;
step two: opening a liquid inlet 301 and a liquid outlet 302 of the fiber separator 3, closing a gas inlet 303 and a deoiling port 304, introducing the cooled extract liquid into the fiber separator 3 through the liquid inlet 301, adsorbing the extract liquid on the surface of the fiber filaments 305 through the adsorption action of the fiber filaments 305, wetting the fiber filaments 305, and discharging the NMP solvent and the dissolved unsaturated oil in the extract liquid from the liquid outlet 302, thereby completing the separation and recovery of the saturated oil.
Of course, as the adsorption amount of the saturated oil on the fiber yarns 305 increases, the fiber yarns 305 are gradually swelled to block the passages between the fiber yarns 305, at this time, the liquid inlet 301 and the liquid outlet 302 need to be closed, the deoiling port 304 needs to be opened, the extrusion plate 306 is driven to extrude the fiber yarns 303, the saturated oil adsorbed on the swelled fiber yarns 305 is discharged from the deoiling port 304, after sufficient extrusion, the air inlet 303 is opened again, hot air is blown in, the residual saturated oil is further discharged, and the fiber yarns 305 are blown away.
In the second step, the unsaturated oil fraction discharged from the liquid outlet 302 accounts for 3-5% of the weight of the initial extract (the extract without recovery treatment), and almost all the unsaturated oil fraction is unsaturated oil, and is a non-ideal component and does not need to be recovered. And the weight of the saturated sub-oil discharged from the deoiling hole 304 by pressing accounts for 5-7% of the weight of the initial extract, and the recovery is basically complete.
In the above method, the surface tension of the NMP solvent is strong, generally reaching 33.7dyne/cm, and the surface tension of the saturated partial oil is weak, generally lower than 22dyne/cm, so that the difference is obvious, when the fiber separation is performed, the surface tension of the fiber filament 305 used is the same as or similar to the surface tension of the saturated partial oil in the extract, that is, the fiber filament 305 with the same weak surface tension, such as polytetrafluoroethylene fiber filament, the surface tension of which is about 20dyne/cm, can absorb the saturated partial oil, and the NMP solvent and the unsaturated partial oil dissolved in the NMP solvent directly pass through.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that various changes and modifications can be made by those skilled in the art without departing from the spirit of the invention, and these changes and modifications are all within the scope of the invention.
Claims (4)
1. A fiber separation type saturated oil separation recovery method of base oil solvent extraction extract is characterized in that a recovery device is utilized and connected to an extract outlet of a base oil solvent extraction device (1), the recovery device comprises a cooler (2) and a fiber separator (3) which are sequentially connected, the fiber separator (3) comprises a shell, a liquid inlet (301), a liquid outlet (302), an air inlet (303) and an oil removal port (304) which can be controlled to be opened and closed are formed in the shell, the liquid inlet (301) is connected with the cooler (2), the air inlet (303) is used for introducing hot air, the oil removal port (304) is used for discharging saturated oil separation, fiber yarns (305) are filled in the shell, meanwhile, an extrusion plate (306) used for extruding the fiber yarns (305) is arranged, through holes are distributed in the extrusion plate (306), and the extrusion plate (306) is connected with a driving piece (307) and used for driving the extrusion plate (306) to extrude;
the method comprises the following specific steps:
the method comprises the following steps: cooling the extract in a cooler (2) to reduce the temperature of the extract from 50-60 ℃ to 5-15 ℃ to reduce the solubility and selectively increase the NMP solvent in the extract, so that the saturated oil in the extract is released from the NMP solvent;
step two: opening a liquid inlet (301) and a liquid outlet (302) of the fiber separator (3) under control, closing a gas inlet (303) and a deoiling port (304), introducing the cooled extract liquid into the fiber separator (3) through the liquid inlet (301), and adsorbing saturated partial oil in the extract liquid to the surface of the fiber filaments (305) through the adsorption action of the fiber filaments (305) to wet the fiber filaments (305), while discharging the NMP solvent and dissolved unsaturated partial oil in the extract liquid from the liquid outlet (302), thereby completing the separation and recovery of the saturated partial oil; the fiber yarns (305) are gradually swelled along with the increase of the adsorption amount of the saturated oil distribution on the fiber yarns (305), so that channels among the fiber yarns (305) are blocked, the liquid inlet (301) and the liquid outlet (302) are closed at the moment, the oil removing port (304) is opened, the extrusion plate (306) is driven to extrude the fiber yarns (305), the saturated oil distribution adsorbed on the swollen fiber yarns (305) is discharged from the oil removing port (304), after the full extrusion, the air inlet (303) is opened, hot air is blown in, the residual saturated oil distribution is further discharged, and the fiber yarns (305) are blown away.
2. The method for recovering the defibrated saturated oil fraction of the extract liquid obtained by the solvent extraction of the base oil according to claim 1, wherein the surface tension of the fiber filaments (305) is the same as or similar to the surface tension of the saturated oil fraction in the extract liquid.
3. The method according to claim 1, wherein chilled water at-10 to 0 ℃ is circulated in the cooler.
4. The method for recovering the defibration type saturated oil from the extract of the base oil solvent extraction as claimed in claim 1, wherein in the second step, the unsaturated oil discharged from the liquid outlet (302) accounts for 3-5% of the weight of the initial extract.
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| GB2012809B (en) * | 1977-12-22 | 1982-04-15 | Exxon Research Engineering Co | Simultaneous deasphalting extraction process |
| US4382895A (en) * | 1979-11-27 | 1983-05-10 | Texaco Inc. | Preparation of alkyl sulfonates |
| CN2175024Y (en) * | 1993-12-13 | 1994-08-24 | 中国石化茂名石油化工公司 | Device for coagulation, clarification and separation of liquid |
| CN1058514C (en) * | 1995-04-11 | 2000-11-15 | 中国石油化工总公司石油化工科学研究院 | Combination process for producing fine quality catalytic cracking raw material |
| EP0839891B1 (en) * | 1996-10-31 | 2004-06-16 | Repsol Petroleo S.A. | Process for obtaining aromatic oils having a polycyclic aromatics content of less than 3% which are useful as process oils |
| US20020036158A1 (en) * | 2000-08-08 | 2002-03-28 | Austin Douglas P. | Batch process for refining used oil |
| JP4152693B2 (en) * | 2002-08-09 | 2008-09-17 | 月島機械株式会社 | Equipment for collecting high melting point components in gas and equipment for collecting dihalogenated aromatic compounds in gas |
| HK1113636A2 (en) * | 2007-08-24 | 2008-10-10 | 正昌科技有限公司 | Vibrating membrance micro-filtration of used oil |
| CN101870886B (en) * | 2010-06-07 | 2013-10-30 | 中国石油大学(华东) | Production method of environment-friendly rubber oil |
| CN105754707B (en) * | 2016-03-22 | 2018-08-21 | 中山大学 | A kind of lube oil furfural refining unit and method with multistage Extract recovery system |
| CN213537349U (en) * | 2020-09-29 | 2021-06-25 | 四川中科汇智石油工程设计有限公司 | Oil filter for oil depot |
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