CN113122364A - Lubricating oil extraction and refining system and process - Google Patents
Lubricating oil extraction and refining system and process Download PDFInfo
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- CN113122364A CN113122364A CN201911400583.6A CN201911400583A CN113122364A CN 113122364 A CN113122364 A CN 113122364A CN 201911400583 A CN201911400583 A CN 201911400583A CN 113122364 A CN113122364 A CN 113122364A
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- 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
- C10M177/00—Special methods of preparation of lubricating compositions; Chemical modification by after-treatment of components or of the whole of a lubricating composition, not covered by other classes
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Abstract
The invention discloses a lubricating oil extracting and refining system which comprises a pipeline for delivering liquid, a high-speed centrifugal pump, an extraction separation tower, an extraction liquid temporary storage tank, a raffinate temporary storage tank, a first rectifying tower for recovering an extractant, a second rectifying tower for refining lubricating oil, a rubber oil receiving tank for storing rubber oil, a lubricating oil receiving tank for storing refined lubricating oil and an extractant receiving tank for storing the extractant. The system and the process have high yield and purity, and are more environment-friendly to use.
Description
Technical Field
The invention belongs to the technical field of lubricating oil extraction and refining, and particularly relates to a lubricating oil extraction and refining system and process.
Background
Lubricating oils are mainly classified into mineral, synthetic and vegetable oils. After the rectification, the mineral contains non-ideal components such as polycyclic aromatic hydrocarbon, heterocycle, organic acid ester and the like, so that indexes such as oxidation stability, viscosity index and the like of the lubricating oil are poor, refining treatment is generally carried out in industry, and a solvent refining process is an ideal treatment process. The traditional extraction process has the disadvantages that the extractant and the lubricating oil are in up-and-down cross flow, the extractant and the lubricating oil cannot be fully mixed, liquid-liquid contact exchange is not sufficient, the refining effect is not ideal, the consumption of the extractant is large, the product yield is low, the energy consumption is large, and the product quality is not ideal.
Disclosure of Invention
The invention aims to provide a lubricating oil extraction and refining system and process, which have high yield and purity and are more environment-friendly to use.
In order to achieve the purpose, the invention provides the following technical scheme:
a lubricating oil extraction and refining system comprises a pipeline for delivering liquid, a high-speed centrifugal pump, an extraction separation tower, an extraction liquid temporary storage tank, a raffinate temporary storage tank, a first rectifying tower for recovering an extractant, a second rectifying tower for refining lubricating oil, a rubber oil receiving tank for storing rubber oil, a lubricating oil receiving tank for storing refined lubricating oil and an extractant receiving tank for storing the extractant; the liquid outlet of high-speed centrifugal pump passes through the inlet of pipeline intercommunication extractive separation tower, the heavy liquid export of extractive separation tower passes through the inlet of pipeline intercommunication extract jar of keeping in, the light liquid export of extractive separation tower passes through the inlet of pipeline intercommunication raffinate jar of keeping in, the liquid outlet of extract jar of keeping in passes through the inlet of pipeline intercommunication first rectifying column, the liquid outlet of raffinate jar of keeping in passes through the inlet of pipeline intercommunication second rectifying column, the bottom liquid outlet of first rectifying column passes through pipeline intercommunication rubber oil and receives the jar, the top liquid outlet of first rectifying column passes through pipeline intercommunication extractant and receives the jar, the bottom liquid outlet of second rectifying column passes through pipeline intercommunication lubricating oil and receives the jar, the top liquid outlet of second rectifying column passes through pipeline intercommunication extractant and receives the jar.
Further, be equipped with first atmospheric pressure balance pipe between extract temporary storage tank and the raffinate temporary storage tank, first atmospheric pressure balance pipe locates the upper portion of extract temporary storage tank and raffinate temporary storage tank, be equipped with the second atmospheric pressure balance pipe between the pipeline of extraction separator intercommunication extract temporary storage tank and the pipeline of extraction separator intercommunication raffinate temporary storage tank.
Further, the liquid outlet of the raffinate temporary storage tank is arranged in the middle of the side wall of the raffinate temporary storage tank, a branch pipe is arranged on a pipeline between the extract temporary storage tank and the first rectifying tower, one end of the branch pipe is communicated with the bottom of the raffinate temporary storage tank, and a valve is arranged on the branch pipe.
Further, the extraction separation tower includes lower disengagement section, lower extraction section, goes up extraction section and last disengagement section by supreme setting down, disengagement section bottom is equipped with heavy liquid export down, it is equipped with the light liquid export to go up the disengagement section top, the outside cover of extraction section is equipped with the pipeline mixer down, the bottom of pipeline mixer is equipped with the inlet, the top of pipeline mixer is equipped with the liquid outlet, the liquid outlet is located and is extracted section and last extraction section down in the extraction tower body between, the pipeline mixer is equipped with the high-speed shear emulsion pump.
Further, the first rectifying tower and the second rectifying tower are both film flash rectifying towers, and each film flash rectifying tower comprises an evaporator, a rectifying section and a cooling recovery section which are arranged from bottom to top; the evaporimeter is the back taper, the evaporimeter bottom is equipped with the liquid outlet, the fixed hydrocyclone flow distribution plate that is equipped with on the inside wall of evaporimeter, evaporimeter upper portion is equipped with the inlet, first sump oil tank section lateral wall upper portion is equipped with the extractant liquid outlet.
Furthermore, a first heater is arranged between the extraction liquid temporary storage tank and the first rectifying tower, and a second heater is arranged between the raffinate temporary storage tank and the second rectifying tower.
Furthermore, a first cooler is arranged between the first rectifying tower and the extracting agent receiving tank, and a second cooler is arranged between the second rectifying tower and the extracting agent receiving tank.
Furthermore, the system for extracting and refining lubricating oil also comprises a vacuum unit, and the vacuum unit is communicated with the extracting agent receiving tank.
A process for extracting refined lubricating oil by adopting a lubricating oil extracting and refining system comprises the following steps: (1) premixing: adding an extracting agent and lubricating oil into a high-speed centrifugal pump together for premixing, wherein the volume ratio of the lubricating oil to the extracting agent is 1: 1.0-1.4; (2) and (3) extraction: sending the premixed mixed solution into an extraction separation tower through a pipeline for extraction and liquid separation, discharging the extract from a heavy liquid outlet, and discharging the raffinate from a light liquid outlet; (3) temporary storage: temporarily storing the extraction liquid discharged from the extraction separation tower in an extraction liquid temporary storage tank, temporarily storing the raffinate discharged from the extraction separation tower in a raffinate temporary storage tank, and adding an extracting agent into the raffinate temporary storage tank; (4) refining: delivering the extract liquor in the extract liquor temporary storage tank into a first rectifying tower through a pipeline for rectification, discharging the rubber oil into a rubber oil receiving tank from a liquid outlet at the bottom of the first rectifying tower in the rectification process, and discharging the extracting agent in a vapor phase into an extracting agent receiving tank from a liquid outlet at the top of the first rectifying tower through condensation; and conveying the raffinate in the raffinate temporary storage tank into a second rectifying tower through a pipeline for rectification, discharging the lubricating oil into a lubricating oil receiving tank from a liquid outlet at the bottom of the second rectifying tower in the rectification process, and discharging the extracting agent in a vapor phase into an extracting agent receiving tank from a liquid outlet at the top of the second rectifying tower through condensation.
Further, the extracting agent is one or a mixture of more of furfural, N-methyl pyrrolidone or N, N-dimethylformamide.
The invention has the beneficial effects that:
this lubricating oil extraction refining system and technology use very simply, but extract and separate through the abundant premix reuse extraction knockout tower of high-speed centrifugal pump for lubricating oil in the lubricating oil extracts more thoroughly, the yield of extraction is higher, extract liquid and raffinate after the separation are sent into first rectifying column and second rectifying column respectively and are rectified, improve the purity of lubricating oil and lubricating oil like this, and the extractant can be retrieved and recycled, use such system production lubricating oil yield and purity all than higher, use more environmental protection.
Drawings
FIG. 1 is a schematic view of an extraction separation column according to the present invention;
FIG. 2 is a schematic structural diagram of a thin film flash distillation column according to the present invention;
in the drawings:
1-a first air pressure balancing pipe, 2-a second air pressure balancing pipe, 3-a branch pipe, 4-a lower separation section, 5-a lower extraction section, 6-an upper extraction section, 7-an upper separation section, 8-a heavy liquid outlet, 9-a light liquid outlet, 10-a pipeline mixer, 11-a high-speed shearing emulsification pump, 12-an evaporator, 13-a rectification section, 14-a cooling recovery section, 15-a liquid outlet, 16-a liquid inlet, 17-an extractant liquid outlet and 18-a valve.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
as shown in fig. 1 and 2, the present invention provides a lubricating oil refining system, which comprises a pipeline for delivering liquid, a high-speed centrifugal pump, an extraction separation tower, an extract temporary storage tank, a raffinate temporary storage tank, a first rectification tower for recovering an extractant, a second rectification tower for refining lubricating oil, a rubber oil receiving tank for storing rubber oil, a lubricating oil receiving tank for storing refined lubricating oil, and an extractant receiving tank for storing an extractant; the liquid outlet 15 of the high-speed centrifugal pump is communicated with the liquid inlet 16 of the extraction separation tower through a pipeline, the heavy liquid outlet 8 of the extraction separation tower is communicated with a liquid inlet 16 of the extraction liquid temporary storage tank through a pipeline, the light liquid outlet 9 of the extraction separation tower is communicated with the liquid inlet 16 of the temporary raffinate storage tank through a pipeline, a liquid outlet 15 of the extract liquor temporary storage tank is communicated with a liquid inlet 16 of the first rectifying tower through a pipeline, the liquid outlet 15 of the raffinate temporary storage tank is communicated with the liquid inlet 16 of the second rectifying tower through a pipeline, a liquid outlet 15 at the bottom of the first rectifying tower is communicated with the rubber oil receiving tank through a pipeline, a liquid outlet 15 at the top of the first rectifying tower is communicated with the extractant receiving tank through a pipeline, and a bottom liquid outlet 15 of the second rectifying tower is communicated with the lubricating oil receiving tank through a pipeline, and a top liquid outlet 15 of the second rectifying tower is communicated with the extractant receiving tank through a pipeline. When the lubricating oil extracting and refining system is used, the extracting agent and the lubricating oil are added into the high-speed centrifugal pump together for premixing; then the premixed mixed solution is sent into an extraction separation tower through a pipeline for extraction and liquid separation, the extract liquid is discharged from a heavy liquid outlet 8, and the raffinate liquid is discharged from a light liquid outlet 9; temporarily storing the extraction liquid discharged from the extraction separation tower in an extraction liquid temporary storage tank, temporarily storing the raffinate discharged from the extraction separation tower in a raffinate temporary storage tank, and adding an extracting agent into the raffinate temporary storage tank; then the extract liquor in the extract liquor temporary storage tank is sent to a first rectifying tower through a pipeline for rectification, the rubber oil is discharged into a rubber oil receiving tank from a liquid outlet 15 at the bottom of the first rectifying tower in the rectification process, and the extractant is discharged into an extractant receiving tank from a liquid outlet 15 at the top of the first rectifying tower; and conveying the raffinate in the raffinate temporary storage tank into a second rectifying tower through a pipeline for rectification, discharging the lubricating oil into a lubricating oil receiving tank from a liquid outlet 15 at the bottom of the second rectifying tower in the rectification process, and discharging the extractant into an extractant receiving tank from a liquid outlet 15 at the top of the second rectifying tower. The system is simple to use, but fully mixes the lubricant oil by the high-speed centrifugal pump and then extracts and separates by the extraction separation tower, so that the lubricant oil in the lubricant oil is extracted more thoroughly, the extraction yield is higher, the separated extract liquid and raffinate are respectively sent into the first rectifying tower and the second rectifying tower to be rectified, the purity of the lubricant oil and the purity of the lubricant oil are improved, the extractant can be recycled, the yield and the purity of the lubricant oil produced by the system are higher, and the system is more environment-friendly to use.
Be equipped with first atmospheric pressure balance pipe 1 between extract temporary storage tank and the raffinate temporary storage tank, first atmospheric pressure balance pipe 1 is located the upper portion of extract temporary storage tank and raffinate temporary storage tank, be equipped with second atmospheric pressure balance pipe 2 between the pipeline of extraction separator intercommunication extract temporary storage tank and the pipeline of extraction separator intercommunication raffinate temporary storage tank. By the arrangement, the extraction liquid and the raffinate are prevented from being conveyed into the extraction liquid temporary storage tank and the raffinate temporary storage tank respectively due to the influence of air pressure, so that the whole system is smooth and safe in use.
The liquid outlet 15 of the raffinate temporary storage tank is arranged in the middle of the side wall of the raffinate temporary storage tank, a branch pipe 3 is arranged on a pipeline between the extract temporary storage tank and the first rectifying tower, one end of the branch pipe 3 is communicated with the bottom of the raffinate temporary storage tank, and a valve 18 is arranged on the branch pipe 3. Like this in extracting the refining process, add the extractant in the raffinate temporary storage tank now, can extract once more in raffinate temporary storage tank like this, further improve the extraction rate, in sending into the extract in the raffinate temporary storage tank lower part through branch pipe 3 in the pipeline between extract temporary storage tank and the first flash column for the extract gets into first flash column and rectifies.
As shown in fig. 1, the extraction separation tower comprises a lower separation section 4, a lower extraction section 5, an upper extraction section 6 and an upper separation section 7, which are arranged from bottom to top, wherein the bottom of the lower separation section 4 is provided with a heavy liquid outlet 8, the top of the upper separation section 7 is provided with a light liquid outlet 9, the outer part of the lower extraction section 5 is sleeved with a pipeline mixer 10, the bottom of the pipeline mixer 10 is provided with a liquid inlet 16, the top of the pipeline mixer 10 is provided with a liquid outlet 15, the liquid outlet 15 is arranged between the lower extraction section 5 and the upper extraction section 6 in the extraction tower, and the pipeline mixer 10 is provided with a high-speed shearing emulsion pump 11. Thus, the premixed mixed liquor is added into the pipeline mixer 10 from a liquid inlet 16 of the pipeline mixer 10 through a pipeline for fully mixing, and then enters the extraction separation tower through a liquid outlet 15 of the pipeline mixer 10, the mixed liquor entering the extraction separation tower is firstly more fully mixed and extracted in an upper extraction section 6 and a lower extraction section 5, then is respectively subjected to liquid separation in an upper separation section 4 and a lower separation section 7, the extract liquor is discharged from a heavy liquid outlet 8 at the bottom of the lower separation section 4, and the raffinate is discharged from a light liquid outlet 9 at the top of the upper separation section 7; mix liquid intensive mixing in pipeline mixer 10, and pipeline mixer 10 is equipped with high-speed shearing emulsion pump 11 for mixed liquid mixes more fully, and the extraction is more abundant, further improves the productivity of lubricating oil.
As shown in fig. 1, the first rectifying tower and the second rectifying tower are both film flash rectifying towers, and each film flash rectifying tower comprises an evaporator 12, a rectifying section 13 and a cooling recovery section 14 which are arranged from bottom to top; evaporator 12 is the back taper, evaporator 12 bottom is equipped with liquid outlet 15, the fixed hydrocyclone flow distribution plate that is equipped with on the inside wall of evaporator 12, evaporator 12 upper portion is equipped with inlet 16, first oil collecting tank section lateral wall upper portion is equipped with extractant liquid outlet 17. The extract liquid is sent into a first rectifying tower from a liquid inlet 16 at the upper part of the evaporator 12, the extract liquid is rectified in the first rectifying tower, the rubber oil is discharged into a rubber oil receiving tank from a liquid outlet 15 at the bottom of the first rectifying tower in the rectifying process, and the extractant is discharged into an extractant receiving tank from the liquid outlet 15 at the top of the first rectifying tower; conveying the raffinate in the raffinate temporary storage tank into a second rectifying tower through a pipeline for rectification, discharging the lubricating oil into a lubricating oil receiving tank from a liquid outlet 15 at the bottom of the second rectifying tower in the rectification process, and discharging the extractant into an extractant receiving tank from a liquid outlet 15 at the top of the second rectifying tower; because the evaporator 12 is in the shape of an inverted cone, the ratio of the surface area of the inner lower part of the evaporator 12 to the volume of the inner upper part of the evaporator 12 is reduced, so that the vapor phase component generated by continuously heating the liquid phase component of the inner lower part of the evaporator 12 is easy to rise, thereby improving the yield of rectification, and because the evaporator 12 is in the shape of an inverted cone, the length of the downward flowing of the liquid phase component is increased, the retention time of the liquid phase component in the evaporator 12 is increased, the heating time of the liquid phase component is also increased, the yield of rectification is further improved, and the yield of lubricating oil and the purity of the lubricating oil are also improved.
A first heater is arranged between the extraction liquid temporary storage tank and the first rectifying tower, and a second heater is arranged between the raffinate temporary storage tank and the second rectifying tower. Therefore, the extraction liquid and the raffinate are preheated during the extraction and rectification, so that the extraction and rectification of the extraction liquid and the raffinate are quicker, the rectification yield is improved, and the yield and the purity of the lubricating oil are also improved.
A first cooler is arranged between the first rectifying tower and the extracting agent receiving tank, and a second cooler is arranged between the second rectifying tower and the extracting agent receiving tank. The extractant that retrieves again like this carries out further cooling between getting into extractant receiving tank, reduces the influence that the extractant of atmospheric pressure in the extractant receiving tank got into extractant receiving tank to the extractant of retrieving again for entire system's use is more smooth and easy.
The system for extracting and refining lubricating oil further comprises a vacuum unit, and the vacuum unit is communicated with the extracting agent receiving tank. When the extractant that retrieves again is collected, adopt the vacuum unit to carry out evacuation processing to extractant receiving tank, reduce in the extractant receiving tank influence that atmospheric pressure got into extractant receiving tank to the extractant that retrieves again for entire system's use is more smooth and easy.
A process for extracting refined lubricating oil by adopting a lubricating oil extracting and refining system comprises the following steps: (1) premixing: adding an extracting agent and lubricating oil into a high-speed centrifugal pump together for premixing, wherein the volume ratio of the extracting agent to the lubricating oil is 1: 1.0-1.4; (2) and (3) extraction: sending the premixed mixed solution into an extraction separation tower through a pipeline for extraction and liquid separation, discharging the extract from a heavy liquid outlet 8, and discharging the raffinate from a light liquid outlet 9; (3) temporary storage: temporarily storing the extraction liquid discharged from the extraction separation tower in an extraction liquid temporary storage tank, temporarily storing the raffinate discharged from the extraction separation tower in a raffinate temporary storage tank, and adding an extracting agent into the raffinate temporary storage tank; (4) refining: delivering the extract liquor in the extract liquor temporary storage tank into a first rectifying tower through a pipeline for rectification, discharging the lubricating oil into a lubricating oil receiving tank from a liquid outlet 15 at the bottom of the first rectifying tower in the rectification process, and discharging the extractant into an extractant receiving tank from a liquid outlet 15 at the top of the first rectifying tower; and conveying the raffinate in the raffinate temporary storage tank into a second rectifying tower through a pipeline for rectification, discharging the lubricating oil into a lubricating oil receiving tank from a liquid outlet 15 at the bottom of the second rectifying tower in the rectification process, and discharging the extractant into an extractant receiving tank from a liquid outlet 15 at the top of the second rectifying tower.
Example 1:
(1) premixing: adding lubricating oil and furfural into a high-speed centrifugal pump together for premixing, wherein the volume ratio of the lubricating oil to the furfural is 1: 1;
(2) and (3) extraction: adding the premixed mixed liquor into a pipeline mixer 10 from a liquid inlet 16 of the pipeline mixer 10 through a pipeline for fully mixing, then feeding the premixed mixed liquor into an extraction separation tower through a liquid outlet 15 of the pipeline mixer 10, firstly carrying out more full mixing and extraction on the mixed liquor entering the extraction separation tower in an upper extraction section 6 and a lower extraction section 5, then respectively carrying out liquid separation in an upper separation section 4 and a lower separation section 7, discharging the extract liquor from a heavy liquid outlet 8 at the bottom of the lower separation section 4, and discharging the raffinate from a light liquid outlet 9 at the top of the upper separation section 7;
(3) temporary storage: temporarily storing the extraction liquid discharged from the extraction separation tower in an extraction liquid temporary storage tank, temporarily storing the raffinate discharged from the extraction separation tower in a raffinate temporary storage tank, and adding an extracting agent into the raffinate temporary storage tank;
(4) refining: conveying the extraction liquid in the extraction liquid temporary storage tank to a first heater through a pipeline for heating, opening a valve 18 on a branch pipe 3, conveying the extraction liquid in the extraction liquid temporary storage tank to the first heater through the pipeline for heating, conveying the heated extraction liquid into a first rectifying tower for rectifying, discharging rubber oil into a rubber oil receiving tank from a liquid outlet 15 at the bottom of the first rectifying tower in the rectifying process, discharging furfural into a first cooler from the liquid outlet 15 at the top of the first rectifying tower for cooling and condensing again, and conveying into an extraction agent receiving tank; conveying the raffinate in the raffinate temporary storage tank to a first heater through a pipeline for heating, conveying the heated raffinate into a second rectifying tower for rectifying, discharging the lubricating oil from a liquid outlet 15 at the bottom of the second rectifying tower into a lubricating oil receiving tank in the rectifying process, discharging the furfural from a liquid outlet 15 at the top of the second rectifying tower into a second cooler for cooling and condensing again, and conveying the furfural into an extractant receiving tank; and simultaneously opening the vacuum unit to vacuumize the extractant receiving tank.
Example 2:
(1) premixing: adding lubricating oil and N-methyl pyrrolidone into a high-speed centrifugal pump together for premixing, wherein the volume ratio of the lubricating oil to the N-methyl pyrrolidone is 1: 1.2;
(2) and (3) extraction: adding the premixed mixed liquor into a pipeline mixer 10 from a liquid inlet 16 of the pipeline mixer 10 through a pipeline for fully mixing, then feeding the premixed mixed liquor into an extraction separation tower through a liquid outlet 15 of the pipeline mixer 10, firstly carrying out more full mixing and extraction on the mixed liquor entering the extraction separation tower in an upper extraction section 6 and a lower extraction section 5, then respectively carrying out liquid separation in an upper separation section 4 and a lower separation section 7, discharging the extract liquor from a heavy liquid outlet 8 at the bottom of the lower separation section 4, and discharging the raffinate from a light liquid outlet 9 at the top of the upper separation section 7;
(3) temporary storage: temporarily storing the extraction liquid discharged from the extraction separation tower in an extraction liquid temporary storage tank, temporarily storing the raffinate discharged from the extraction separation tower in a raffinate temporary storage tank, and adding an extracting agent into the raffinate temporary storage tank;
(4) refining: conveying the extraction liquid in the extraction liquid temporary storage tank to a first heater through a pipeline for heating, opening a valve 18 on a branch pipe 3, conveying the extraction liquid in the extraction liquid temporary storage tank to the first heater through the pipeline for heating, conveying the heated extraction liquid into a first rectifying tower for rectifying, discharging rubber oil into a rubber oil receiving tank from a liquid outlet 15 at the bottom of the first rectifying tower in the rectifying process, discharging N-methylpyrrolidone into a first cooler from a liquid outlet 15 at the top of the first rectifying tower for cooling and condensing again, and conveying the N-methylpyrrolidone into an extraction agent receiving tank; conveying the raffinate in the raffinate temporary storage tank to a first heater through a pipeline for heating, conveying the heated raffinate into a second rectifying tower for rectifying, discharging the lubricating oil into a lubricating oil receiving tank from a liquid outlet 15 at the bottom of the second rectifying tower in the rectifying process, discharging the N-methylpyrrolidone into a second cooler from the liquid outlet 15 at the top of the second rectifying tower for cooling and condensing again, and conveying the N-methylpyrrolidone into an extractant receiving tank; and simultaneously opening the vacuum unit to vacuumize the extractant receiving tank.
Example 3:
(1) premixing: adding lubricating oil and N, N-dimethylformamide into a high-speed centrifugal pump together for premixing, wherein the volume ratio of the lubricating oil to the N, N-dimethylformamide is 1: 1.3;
(2) and (3) extraction: adding the premixed mixed liquor into a pipeline mixer 10 from a liquid inlet 16 of the pipeline mixer 10 through a pipeline for fully mixing, then feeding the premixed mixed liquor into an extraction separation tower through a liquid outlet 15 of the pipeline mixer 10, firstly carrying out more full mixing and extraction on the mixed liquor entering the extraction separation tower in an upper extraction section 6 and a lower extraction section 5, then respectively carrying out liquid separation in an upper separation section 4 and a lower separation section 7, discharging the extract liquor from a heavy liquid outlet 8 at the bottom of the lower separation section 4, and discharging the raffinate from a light liquid outlet 9 at the top of the upper separation section 7;
(3) temporary storage: temporarily storing the extraction liquid discharged from the extraction separation tower in an extraction liquid temporary storage tank, temporarily storing the raffinate discharged from the extraction separation tower in a raffinate temporary storage tank, and adding an extracting agent into the raffinate temporary storage tank;
(4) refining: conveying the extraction liquid in the extraction liquid temporary storage tank to a first heater through a pipeline for heating, opening a valve 18 on a branch pipe 3, conveying the extraction liquid in the extraction liquid temporary storage tank to the first heater through the pipeline for heating, conveying the heated extraction liquid into a first rectifying tower for rectifying, discharging rubber oil into a rubber oil receiving tank from a liquid outlet 15 at the bottom of the first rectifying tower in the rectifying process, discharging N, N-dimethylformamide into a first cooler from a liquid outlet 15 at the top of the first rectifying tower for cooling and condensing again, and conveying the N, N-dimethylformamide into an extractant receiving tank; conveying the raffinate in the raffinate temporary storage tank to a first heater through a pipeline for heating, conveying the heated raffinate into a second rectifying tower for rectifying, discharging the lubricating oil into a lubricating oil receiving tank from a liquid outlet 15 at the bottom of the second rectifying tower in the rectifying process, discharging the N, N-dimethylformamide into a second cooler from the liquid outlet 15 at the top of the second rectifying tower for cooling and condensing again, and conveying the N, N-dimethylformamide into an extractant receiving tank; and simultaneously opening the vacuum unit to vacuumize the extractant receiving tank.
The above examples are only a few of the several preferred embodiments of the present invention, and it should be noted that the present invention is not limited to the above examples; for a person skilled in the art, modifications may be made to the technical solutions described in the foregoing embodiments, or equivalents may be substituted for some of the technical features; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions.
Claims (10)
1. A lubricating oil extraction and refining system is characterized in that: the device comprises a pipeline for delivering liquid, a high-speed centrifugal pump, an extraction separation tower, an extraction liquid temporary storage tank, a raffinate temporary storage tank, a first rectifying tower for recovering an extractant, a second rectifying tower for refining lubricating oil, a rubber oil receiving tank for storing rubber oil, a lubricating oil receiving tank for storing refined lubricating oil and an extractant receiving tank for storing the extractant; the liquid outlet of high-speed centrifugal pump passes through the inlet of pipeline intercommunication extractive separation tower, the heavy liquid export of extractive separation tower passes through the inlet of pipeline intercommunication extract jar of keeping in, the light liquid export of extractive separation tower passes through the inlet of pipeline intercommunication raffinate jar of keeping in, the liquid outlet of extract jar of keeping in passes through the inlet of pipeline intercommunication first rectifying column, the liquid outlet of raffinate jar of keeping in passes through the inlet of pipeline intercommunication second rectifying column, the bottom liquid outlet of first rectifying column passes through pipeline intercommunication rubber oil and receives the jar, the top liquid outlet of first rectifying column passes through pipeline intercommunication extractant and receives the jar, the bottom liquid outlet of second rectifying column passes through pipeline intercommunication lubricating oil and receives the jar, the top liquid outlet of second rectifying column passes through pipeline intercommunication extractant and receives the jar.
2. The system for refining and extracting lubricating oil according to claim 1, wherein: the extraction liquid is equipped with first atmospheric pressure balance pipe between jar and the raffinate jar of keeping in, first atmospheric pressure balance pipe is located the upper portion of extract jar and the raffinate jar of keeping in, be equipped with the second atmospheric pressure balance pipe between the pipeline of extraction separator intercommunication extract jar of keeping in and the pipeline of extraction separator intercommunication raffinate jar of keeping in.
3. The system for refining and extracting lubricating oil according to claim 1, wherein: the liquid outlet of the raffinate temporary storage tank is arranged in the middle of the side wall of the raffinate temporary storage tank, a branch pipe is arranged on a pipeline between the extract temporary storage tank and the first rectifying tower, one end of the branch pipe is communicated with the bottom of the raffinate temporary storage tank, and a valve is arranged on the branch pipe.
4. The system for refining and extracting lubricating oil according to claim 1, wherein: the extraction separation tower comprises a lower separation section, a lower extraction section, an upper extraction section and an upper separation section, wherein the lower separation section, the lower extraction section, the upper extraction section and the upper separation section are arranged from bottom to top, a heavy liquid outlet is arranged at the bottom of the lower separation section, a light liquid outlet is arranged at the top of the upper separation section, a pipeline mixer is sleeved outside the lower extraction section, a liquid inlet is arranged at the bottom of the pipeline mixer, a liquid outlet is arranged at the top of the pipeline mixer, the liquid outlet is arranged between the lower extraction section and the upper extraction section in the extraction tower, and the pipeline mixer is provided with a high-speed.
5. The system for refining and extracting lubricating oil according to claim 1, wherein: the first rectifying tower and the second rectifying tower are both film flash rectifying towers, and each film flash rectifying tower comprises an evaporator, a rectifying section and a cooling recovery section which are arranged from bottom to top; the evaporimeter is the back taper, the evaporimeter bottom is equipped with the liquid outlet, the fixed hydrocyclone flow distribution plate that is equipped with on the inside wall of evaporimeter, evaporimeter upper portion is equipped with the inlet, first sump oil tank section lateral wall upper portion is equipped with the extractant liquid outlet.
6. The system for refining and extracting lubricating oil according to claim 1, wherein: a first heater is arranged between the extraction liquid temporary storage tank and the first rectifying tower, and a second heater is arranged between the raffinate temporary storage tank and the second rectifying tower.
7. The system for refining and extracting lubricating oil according to claim 1, wherein: a first cooler is arranged between the first rectifying tower and the extracting agent receiving tank, and a second cooler is arranged between the second rectifying tower and the extracting agent receiving tank.
8. The system for refining and extracting lubricating oil according to claim 1, wherein: the system for extracting and refining lubricating oil further comprises a vacuum unit, and the vacuum unit is communicated with the extracting agent receiving tank.
9. A process for refining a lubricating oil by using the lubricating oil refining and extraction system according to any one of claims 1 to 8, wherein: the method comprises the following steps:
(1) premixing: adding lubricating oil and an extracting agent into a high-speed centrifugal pump together for premixing, wherein the volume ratio of the lubricating oil to the extracting agent is 1: 1.0-1.4;
(2) and (3) extraction: sending the premixed mixed solution into an extraction separation tower through a pipeline for extraction and liquid separation, discharging the extract from a heavy liquid outlet, and discharging the raffinate from a light liquid outlet;
(3) temporary storage: temporarily storing the extraction liquid discharged from the extraction separation tower in an extraction liquid temporary storage tank, and temporarily storing the raffinate discharged from the extraction separation tower in a raffinate temporary storage tank;
(4) refining: delivering the extract liquor in the extract liquor temporary storage tank into a first rectifying tower through a pipeline for rectification, discharging the rubber oil into a rubber oil receiving tank from a liquid outlet at the bottom of the first rectifying tower in the rectification process, and discharging the extracting agent in a vapor phase into an extracting agent receiving tank from a liquid outlet at the top of the first rectifying tower through condensation; and conveying the raffinate in the raffinate temporary storage tank into a second rectifying tower through a pipeline for rectification, discharging the lubricating oil into a lubricating oil receiving tank from a liquid outlet at the bottom of the second rectifying tower in the rectification process, and discharging the extracting agent in a vapor phase into an extracting agent receiving tank from a liquid outlet at the top of the second rectifying tower through condensation.
10. The process for refining lubricating oil according to claim 9, wherein: the extractant is one or a mixture of more of furfural, N-methyl pyrrolidone or N, N-dimethylformamide.
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