CN212102730U - Solvent recovery unit is refine to lubricating oil - Google Patents
Solvent recovery unit is refine to lubricating oil Download PDFInfo
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- CN212102730U CN212102730U CN202020198533.6U CN202020198533U CN212102730U CN 212102730 U CN212102730 U CN 212102730U CN 202020198533 U CN202020198533 U CN 202020198533U CN 212102730 U CN212102730 U CN 212102730U
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Abstract
The utility model provides a refined solvent recovery unit of lubricating oil, including the extraction tower, extraction tower upper end has connect solvent inlet pipe and refined liquid outlet pipe respectively, the lower extreme has connect lubricating oil inlet pipe and extract outlet pipe respectively, refined liquid gas stripping tower passes through refined liquid outlet pipe connection extraction tower, extract outlet pipe is connected with first cooler and first liquid separator, first liquid separator upper strata is passed through the heater and is connected with the lubricating oil inlet pipe, the lower floor is connected with second cooler and second liquid separator, the entry of first liquid separator of pipe connection is passed through on second liquid separator upper strata, extract gas stripping tower is connected to the lower floor, refined liquid gas stripping tower and extract gas stripping tower lower part are passed through pipe connection nitrogen generator, upper portion distillate export passes through condenser connection gas-liquid separator, gas-liquid separator's export intercommunication solvent desicator and solvent recovery jar. The device utilizes nitrogen to replace steam for air stripping, reduces sewage, is environment-friendly, saves energy, improves the recovery rate of the solvent, and is convenient and practical.
Description
Technical Field
The utility model belongs to the technical field of lubricating oil production, specifically be a solvent recovery unit is refine to lubricating oil.
Background
Most polycyclic short side chain aromatic hydrocarbons, colloids, asphaltines and other substances are separated from lubricating oil raw materials, so that the properties of the lubricating oil, such as viscosity-temperature property, oxidation resistance stability, carbon residue value, chroma and the like, are improved, the process of meeting the specification standard of the product is called refining of the lubricating oil, and the commonly used method for refining the lubricating oil comprises the following steps: acid-base refining, solvent refining, adsorption refining and hydrorefining, wherein the most widely used method is to adopt a solvent to selectively refine lubricating oil fractions, and furfural refining is one of solvent recovery.
However, in the process of recovering the refined solvent, steam stripping is generally adopted in the industry for the operation of a stripping tower at present, and furfural and water form an azeotrope, so that the solvent recovery process is complex, difficult to operate and high in energy consumption; in addition, the presence of water can also accelerate the oxidation and deterioration of furfural and equipment corrosion, thereby causing the problems of poor oil quality, high agent consumption, high energy consumption, shortened operation period and the like.
SUMMERY OF THE UTILITY MODEL
To prior art's not enough, the utility model provides a refined solvent recovery unit of lubricating oil, through multistage cooling recovery and nitrogen gas air stripping technology improve the refined in-process solvent rate of recovery of lubricating oil, also make the refined effect of lubricating oil better simultaneously.
In order to achieve the above object, the utility model provides a following technical scheme: a lubricating oil refining solvent recovery device comprises an extraction tower, a refined liquid gas extraction tower, an extraction liquid gas extraction tower, a nitrogen generator and a solvent recovery tank, wherein the upper end of the extraction tower is respectively connected with a solvent feeding pipe and a refined liquid outlet pipe, the lower end of the extraction tower is respectively connected with a lubricating oil feeding pipe and an extraction liquid outlet pipe, the refined liquid gas extraction tower is connected with the extraction tower through the refined liquid outlet pipe, the extraction liquid outlet pipe is connected with a first cooler, the other end of the first cooler is connected with an inlet of a first liquid-liquid separator, an upper-layer rich oil of the first liquid-liquid separator is connected with a heater through a pipeline, and the other end of the heater is connected with the lubricating oil feeding pipe; the lower-layer first-stage solvent-rich phase of the first liquid-liquid separator is connected with a second cooler, and the other end of the second cooler is connected with an inlet of the second liquid-liquid separator; the upper-layer secondary rich oil phase of the second liquid-liquid separator is connected with the inlet of the first liquid-liquid separator through a pipeline; and the lower-layer secondary solvent-rich phase of the second liquid-liquid separator is connected with the extraction liquid gas stripping tower, the lower parts of the refined liquid gas stripping tower and the extraction liquid gas stripping tower are connected with the nitrogen generator through pipelines, distillate outlets at the upper parts of the refined liquid gas stripping tower and the extraction liquid gas stripping tower are connected with the condenser through pipelines, the other end of the condenser is connected with an inlet of the gas-liquid separator, an outlet of the gas-liquid separator is communicated with the solvent drier through a solvent outlet pipe, and the other end of the solvent drier is connected with the solvent recovery tank.
Preferably, the upper part of the gas-liquid separator is provided with a nitrogen recovery tank, and the lower parts of the refined liquid stripping tower and the extraction liquid stripping tower are respectively a first refined oil outlet and a second refined oil outlet.
Preferably, the cooling of the extract is divided into two stages: the first stage is a low-temperature heat recovery stage, the temperature is controlled to be 75-90 ℃, and the low-temperature waste heat of the extract is fully utilized to exchange heat with cold material flow; the second stage is a circulating water cooling stage, and the temperature is controlled to be 35-50 ℃.
Preferably, the extraction tower and the solvent recovery tank are made of quartz, the front surface of the extraction tower and the solvent recovery tank are provided with volume scales, and the extraction tower, the refined liquid gas extraction tower, the extraction liquid gas extraction tower and the nitrogen recovery tank are uniformly provided with a temperature detection device and a vacuumizing device, and are respectively connected with the digital display circuit.
Preferably, an electronic flow meter and an electronic valve are respectively arranged on the solvent feeding pipe and the lubricating oil feeding pipe.
Preferably, the pressure of the nitrogen generator is controlled to be 1.5-2.5 atm, then the nitrogen generator is heated to 220-260 ℃ and then enters a refined liquid gas stripping tower and an extraction liquid gas stripping tower respectively, the refined liquid gas stripping tower and the extraction liquid gas stripping tower operate within the pressure range of 0.2-0.6 atm, and the gas distillate is cooled to 10-50 ℃ by a condenser and then enters a gas-liquid separator.
Preferably, the nitrogen in the nitrogen recovery tank is compressed by a compressor and then is heated to 220-260 ℃ and enters the extraction tower again for recycling.
Compared with the prior art, the beneficial effects of the utility model are that:
(1) the utility model discloses a temperature of control extract makes its phase splitting, and the interval division of temperature cooling makes the hot make full use of low temperature to the reasonable efficient has utilized cooling device to improve the extract quality, and the solvent rate of recovery reaches 92% -98%, and the nitrogen gas purity that the nitrogen gas recovery jar was retrieved is 99%.
(2) The utility model adopts nitrogen gas to replace vapor gas stripping, thereby not producing sewage, realizing solvent recovery while protecting environment and saving energy, improving the recovery quality, reducing the corrosion of the solvent to equipment and having obvious economic benefit;
(3) the utility model discloses extraction tower and strip tower adopt the quartz glass material, can the operating condition in actual conditions and the follow-up stripper in the visual observation tower, realize the refined dynamic monitoring of solvent.
Other features of the present disclosure and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic diagram of a recovery apparatus for a solvent used in refining lubricating oil according to the present invention;
the device comprises an extraction tower 1, a solvent feeding pipe 2, a lubricating oil feeding pipe 3, an electronic valve 4, a flow meter 5, a refined liquid outlet pipe 6, an extraction liquid outlet pipe 7, a first cooler 8, a first liquid-liquid separator 9, a first oil-rich phase 10, a first solvent-rich phase 11, a second cooler 12, a second liquid-liquid separator 13, a second oil-rich phase 14, a second solvent-rich phase 15, a heater 16, a refined liquid gas stripping tower 17, an extraction liquid gas stripping tower 18, a nitrogen generator 19, a first refined oil outlet 20, a second refined oil outlet 21, a distillate outlet 22, a condenser 23, a nitrogen recovery tank 24, a gas-liquid separator 25, a solvent outlet pipe 26, a solvent dryer 27 and a solvent recovery tank 28.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Unless specifically stated otherwise, the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
Spatially relative terms, such as "above … …," "intermediate," "at … … end," "at the other end," and the like, may be used herein for ease of description to describe one element or feature's spatial relationship to another element or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
Example (b): referring to fig. 1, a lubricating oil refined solvent recovery device comprises an extraction tower 1, a refined liquid gas extraction tower 17, an extraction liquid gas extraction tower 18, a nitrogen generator 19 and a solvent recovery tank 28, wherein the upper end of the extraction tower 1 is respectively connected with a solvent feed pipe 2 and a refined liquid outlet pipe 6, the lower end of the extraction tower 1 is respectively connected with a lubricating oil feed pipe 3 and an extraction liquid outlet pipe 7, the refined liquid gas extraction tower 17 is connected with the extraction tower 1 through the refined liquid outlet pipe 6, the extraction liquid outlet pipe 7 is connected with a first cooler 8, the other end of the first cooler 8 is connected with an inlet of a first liquid-liquid separator 9, an upper-layer rich oil phase 11 of the first liquid-liquid separator 9 is connected with a heater 16 through a pipeline, and the other end of the heater 16 is connected with the lubricating oil feed pipe; the lower-layer first-stage solvent-rich phase 10 of the first liquid-liquid separator 9 is connected with a second cooler 12, and the other end of the second cooler 12 is connected with an inlet of a second liquid-liquid separator 13; the upper-layer second oil-rich phase 14 of the second liquid-liquid separator 13 is connected with the inlet of the first liquid-liquid separator 9 through a pipeline; the lower-layer second-stage rich solvent 15 of the second liquid-liquid separator 13 is connected with an extraction liquid gas stripping tower 18, the lower parts of the refined liquid gas stripping tower 17 and the extraction liquid gas stripping tower 18 are connected with a nitrogen generator 19 through pipelines, distillate outlets at the upper parts of the refined liquid gas stripping tower 17 and the extraction liquid gas stripping tower 18 are connected with a condenser 23 through pipelines, the other end of the condenser 23 is connected with an inlet of a gas-liquid separator 25, an outlet of the gas-liquid separator 25 is communicated with a solvent drier 27 through a solvent outlet pipe 26, and the other end of the solvent drier 27 is connected with a solvent recovery tank 28.
In a particular embodiment, the cooling of the extract is divided into two stages: the first stage is a low-temperature heat recovery stage, the temperature is controlled to be 75-90 ℃, and the low-temperature waste heat of the extract is fully utilized to exchange heat with cold material flow; the second stage is a circulating water cooling stage, and the temperature is controlled to be 35-50 ℃.
The pressure of the nitrogen generator 19 is controlled to be 1.5-2.5 atm, then the nitrogen is heated to 220-260 ℃ and then enters the refined liquid stripping tower 17 and the extraction liquid stripping tower 18 respectively, the refined liquid stripping tower 17 and the extraction liquid stripping tower 18 operate within the pressure range of 0.2-0.6 atm, and the gas distillate is cooled to 10-50 ℃ by the condenser 23 and then enters the gas-liquid separator 25.
Specifically, the lower parts of the refined liquid stripping tower 17 and the extraction liquid stripping tower 18 are a first refined oil outlet 20 and a second refined oil outlet 21 respectively, the upper part of the gas-liquid separator 25 is provided with a nitrogen recovery tank 24, and nitrogen in the nitrogen recovery tank 24 is compressed by a compressor and then is heated to 220-260 ℃ to enter the extraction tower 1 again for recycling.
Further, the extraction tower 1 and the solvent recovery tank 28 are made of quartz, the front surface is provided with volume scales, and a temperature detection device and a vacuumizing device are uniformly arranged in the extraction tower 1, the refined liquid gas extraction tower 17, the extraction liquid gas extraction tower 18 and the nitrogen recovery tank 24 and are respectively connected with a digital display circuit.
Furthermore, the solvent feed pipe 2 and the lube oil feed pipe 3 are respectively provided with an electronic flow meter 5 and an electronic valve 4.
The utility model discloses a working process: lubricating oil and solvent respectively enter an extraction tower 1 for extraction through a lubricating oil feeding pipe 3 and a solvent feeding pipe 2, the upper layer of the extraction tower 1 is refined liquid and enters a refined liquid gas extraction tower 17, the lower layer of the extraction tower 1 is extracted liquid, the extracted liquid at the bottom of the extraction tower enters a first cooler 8 and is cooled to 75 ℃, then enters a first liquid-liquid separator 9 for standing and phase separation, the upper layer is a first-stage rich oil phase 10, the first-stage rich oil phase 10 is heated to 90 ℃ by a heater 16 and then enters the extraction tower 1 together with the lubricating oil, the lower layer is a first-stage rich solvent phase 11, the first-stage rich solvent phase 11 is separated from the first liquid-liquid separator 9 and then enters a second cooler 12 and is cooled to 35 ℃, then the second liquid-liquid separator 13 is subjected to neutral phase separation, the upper layer is a second-stage rich oil phase 14, the second-stage rich oil phase 14 is mixed with the extracted liquid and enters the first liquid gas extraction tower 9 again, the lower layer is a second-stage rich solvent phase 15, the extracted liquid enters an extraction 0.8atm, the pressure in the nitrogen generator 19 is 2atm, the nitrogen generator 19 is started to strip the solvent, the temperature in the stripping tower is kept constant, the upper distillate after stripping is condensed to 25 ℃ by the condenser 23 and then enters the gas-liquid separator 25 for separation, the nitrogen in the upper layer enters the nitrogen recovery tank 24, the solvent in the lower layer enters the solvent dryer 27 through the solvent outlet pipe 26 for drying and recovery, in the embodiment, the recovery rate of the solvent reaches 92-98%, and the purity of the recovered nitrogen is 99%.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It should be understood by those skilled in the art that the present invention is not limited by the above embodiments, and the description in the above embodiments and the description is only preferred examples of the present invention, and is not intended to limit the present invention, and that the present invention can have various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications all fall into the scope of the claimed invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. A recovery device for a lubricating oil refining solvent comprises an extraction tower (1), a refining liquid gas extraction tower (17), an extraction liquid gas extraction tower (18), a nitrogen generator (19) and a solvent recovery tank (28), the upper end of the extraction tower (1) is respectively connected with a solvent feeding pipe (2) and a refined liquid outlet pipe (6), the lower end of the extraction tower (1) is respectively connected with a lubricating oil feeding pipe (3) and an extraction liquid outlet pipe (7), the refined liquid gas stripping tower (17) is connected with the extraction tower (1) through a refined liquid outlet pipe (6), the extract outlet pipe (7) is connected with a first cooler (8), the other end of the first cooler (8) is connected with the inlet of a first liquid-liquid separator (9), the first-level oil-rich phase (11) at the upper layer of the first liquid-liquid separator (9) is connected with a heater (16) through a pipeline, the other end of the heater (16) is connected with a lubricating oil feeding pipe (3); the lower-layer first-stage solvent-rich phase (10) of the first liquid-liquid separator (9) is connected with a second cooler (12), and the other end of the second cooler (12) is connected with an inlet of a second liquid-liquid separator (13); the upper-layer second oil-rich phase (14) of the second liquid-liquid separator (13) is connected with the inlet of the first liquid-liquid separator (9) through a pipeline; the lower secondary solvent-rich phase (15) of the second liquid-liquid separator (13) is connected with an extraction liquid stripping tower (18); refined liquid gas stripping tower (17) and extract gas stripping tower (18) lower part pass through pipe connection nitrogen generator (19), refined liquid gas stripping tower (17) and extract gas stripping tower (18) upper portion distillate export (22) pass through pipe connection condenser (23), the entry of gas-liquid separator (25) is connected to condenser (23) other end, solvent outlet pipe (26) intercommunication solvent desicator (27) is passed through in the export of gas-liquid separator (25), solvent recovery jar (28) is connected to solvent desicator (27) other end.
2. The apparatus for recovering a solvent used in refining a lubricating oil according to claim 1, wherein: the gas-liquid separator (25) is provided with a nitrogen recovery tank (24), and the lower parts of the refined liquid gas stripping tower (17) and the extraction liquid gas stripping tower (18) are respectively a first refined oil outlet (20) and a second refined oil outlet (21).
3. The apparatus for recovering a solvent used in refining a lubricating oil according to claim 1, wherein: the cooling of the extract is divided into two stages: the first stage is a low-temperature heat recovery stage, the temperature is controlled to be 75-90 ℃, and the low-temperature waste heat of the extract is fully utilized to exchange heat with cold material flow; the second stage is a circulating water cooling stage, and the temperature is controlled to be 35-50 ℃.
4. The apparatus for recovering a solvent used in refining a lubricating oil according to claim 1, wherein: the extraction tower (1) and the solvent recovery tank (28) are made of quartz, volume scales are arranged on the front surface of the extraction tower, and a temperature detection device and a vacuumizing device are uniformly arranged in the extraction tower (1), the refined liquid gas extraction tower (17), the extraction liquid gas extraction tower (18) and the nitrogen recovery tank (24) and are respectively connected with a digital display circuit.
5. The apparatus for recovering a solvent used in refining a lubricating oil according to claim 1, wherein: and the solvent feeding pipe (2) and the lubricating oil feeding pipe (3) are respectively provided with an electronic flowmeter (5) and an electronic valve (4).
6. The apparatus for recovering a solvent used in refining a lubricating oil according to claim 1, wherein: the pressure of the nitrogen generator (19) is controlled to be 1.5-2.5 atm, then the nitrogen generator is heated to 220-260 ℃, and then the nitrogen generator enters a refined liquid gas stripping tower (17) and an extraction liquid gas stripping tower (18), the refined liquid gas stripping tower (17) and the extraction liquid gas stripping tower (18) operate within the pressure range of 0.2-0.6 atm, and the gas distillate is cooled to 10-50 ℃ by a condenser (23) and then enters a gas-liquid separator (25).
7. The apparatus for recovering a solvent used in refining a lubricating oil according to claim 2, wherein: and the nitrogen in the nitrogen recovery tank (24) is compressed by a compressor and then is heated to 220-260 ℃ and enters the extraction tower (1) again for cyclic utilization.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020198533.6U CN212102730U (en) | 2020-02-24 | 2020-02-24 | Solvent recovery unit is refine to lubricating oil |
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| CN202020198533.6U CN212102730U (en) | 2020-02-24 | 2020-02-24 | Solvent recovery unit is refine to lubricating oil |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112608765A (en) * | 2020-12-09 | 2021-04-06 | 平遥同妙机车有限公司 | Base oil solvent refining process |
| CN113105937A (en) * | 2021-04-14 | 2021-07-13 | 中国恩菲工程技术有限公司 | Waste mineral oil treatment system and treatment method |
| CN114177657A (en) * | 2021-12-23 | 2022-03-15 | 安徽国孚凤凰科技有限公司 | Coalescence-separation type saturated oil separation recovery device and method for base oil solvent extraction extract |
-
2020
- 2020-02-24 CN CN202020198533.6U patent/CN212102730U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112608765A (en) * | 2020-12-09 | 2021-04-06 | 平遥同妙机车有限公司 | Base oil solvent refining process |
| CN113105937A (en) * | 2021-04-14 | 2021-07-13 | 中国恩菲工程技术有限公司 | Waste mineral oil treatment system and treatment method |
| CN114177657A (en) * | 2021-12-23 | 2022-03-15 | 安徽国孚凤凰科技有限公司 | Coalescence-separation type saturated oil separation recovery device and method for base oil solvent extraction extract |
| CN114177657B (en) * | 2021-12-23 | 2023-03-10 | 安徽国孚凤凰科技有限公司 | Coalescence-separation type saturated oil separation recovery device and method for base oil solvent extraction extract |
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