CN102220164B - Utilization method of aldehydic water of furfural extraction solvent recovery system - Google Patents
Utilization method of aldehydic water of furfural extraction solvent recovery system Download PDFInfo
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- CN102220164B CN102220164B CN2010101470576A CN201010147057A CN102220164B CN 102220164 B CN102220164 B CN 102220164B CN 2010101470576 A CN2010101470576 A CN 2010101470576A CN 201010147057 A CN201010147057 A CN 201010147057A CN 102220164 B CN102220164 B CN 102220164B
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Abstract
The invention relates to a utilization method of aldehydic water of a furfural extraction solvent recovery system, which comprises the following steps: feeding a furfural solvent into an upper part of a first extraction tower, allowing the solvent to be in countercurrent contact with raw oil in the first extraction tower; feeding an extract of the first extraction tower, which is used as a raw material of a second extraction tower, into the lower part of the second extraction tower, feeding the furfural solvent into the upper part of the second extraction tower, allowing the two to be in countercurrent contact in the second extraction tower, separating raffinate oil of the second extraction tower from a residual extract of the second extraction tower; injecting aldehydic water from an aldehyde-water separation pot of a furfural extraction solvent recovery system into the extract of the first extraction tower and the furfural solvent fed into the second extraction tower. By using the method of the invention, not only the throughput of aldehydic water is decreased and the energy consumption of the device is reduced, but also oil products rich in monocyclic aromatics and bicyclic aromatics can be produced.
Description
Technical field
The present invention relates to the method for utilizing that solvent recovering system in a kind of furfural extracting contains aldehyde water, belong to the solvent extraction field in refining of petroleum.
Background technology
The ideal composition of lubricant base is isoparaffin and the long side links alkane of few ring.Have certain side chain lengths and side chain and have monocycle and the double ring arene of certain isomerisation degree, its viscosity temperature characteristic and anti-oxidative stability are better, and additive is had to stronger dissolving power, are therefore the better components of lubricant base.The non-hydrocarbon compound of colloid, bituminous matter, the three above polycyclic aromatic hydrocarbonss of ring and some sulfur-bearing, nitrogen, oxygen is the undesirable components of lubricant base.Solvent extraction in conventional lubrication oil base oil production process is the selective dissolution ability of utilizing organic solvent, remove undesirable components in lube stock, the viscosity temperature characteristic of raising base oil and anti-oxidative stability etc., thus reach the purpose that improves the base oil quality.Solvent extraction process is in the non-hydrocarbon compound that removes colloid, the three above polycyclic aromatic hydrocarbonss of ring and some sulfur-bearing, nitrogen, oxygen, most of ring and two Polycyclic aromatic hydrocarbons have also been removed, and these rings and two Polycyclic aromatic hydrocarbons are better components of lubricant base, therefore wish to retain ring and two Polycyclic aromatic hydrocarbons when removing polycyclic aromatic hydrocarbons.Aromatic hydrocarbon rubber oil requires to have higher aromatic carbon content in addition, while polycyclic aromatic hydrocarbons (polycyclicaromatics, be abbreviated as PCA, adopt the method IP346 of Institute of Petroleum(IP) to measure) content requires again lowlyer, and this will seek survival and produce the oil product that is rich in a ring and two Polycyclic aromatic hydrocarbons.In sum, the needs exploitation is a kind of both can remove polycyclic aromatic hydrocarbons, can retain again the solvent extraction process of a ring and two Polycyclic aromatic hydrocarbons.
The furfural extracting is to produce one of main technique of lubricant base.In order to improve the remove ability of furfural to aromatic hydrocarbons in oil product, generally use the water content low furfural of trying one's best, if required, control and reclaim furfural water content<0.5% (quality).Therefore in the solvent recuperation process, need furfural is carried out to drying, remove moisture content contained in furfural, the dry furfural after removing moisture content is used as circulating solvent.The furfural drying process is the moisture furfural in the aldehyde water separation tank to be sent into to drying tower carry out drying, obtains the dry furfural of moisture<0.5%, uses as circulating solvent; The aldehyde water that contains in the aldehyde water separation tank is sent into to dehydration tower, remove moisture content, send again condensed dehydration tower top aldehyde water mixture back to the aldehyde water separation tank and separate.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of method of utilizing of aldehyde-contained water of furfural extraction solvent recovery system, and the method can reduce treatment capacity, the reduction plant energy consumption that contains aldehyde water, produces simultaneously the oil product that is rich in a ring and two Polycyclic aromatic hydrocarbons.
A kind of aldehyde-contained water of furfural extraction solvent recovery system utilize method, by furfural solvent input the first extraction tower top, with stock oil counter current contact in the first extraction tower; Using the raw material of the Extract of the first extraction tower as the second extraction tower, input the bottom of the second extraction tower, by the top of furfural solvent input the second extraction tower, the two is counter current contact in the second extraction tower, raffinates oil from the raffinate of the second extraction tower, isolating the second extraction tower; At the Extract of the first extraction tower with in entering the furfural solvent of the second extraction tower, inject and contain aldehyde water from furfural extraction solvent recovery system aldehyde water separation tank.
The present invention adopts double-column process, usings the Extract of the first extraction tower as the raw material of the second extraction tower.The present invention is by using the furfural solvent of moisture<0.5% (quality) in the first extraction tower, and at the Extract of the first extraction tower with in entering the furfural solvent of the second extraction tower, inject and contain aldehyde water, thereby the second extraction tower that has obtained being rich in a ring and two Polycyclic aromatic hydrocarbons is raffinated oil.Adopt method of the present invention can obtain three kinds of products, the first extraction tower that at the bottom of the first extraction tower, raffinate obtains after solvent recuperation is raffinated oil, and can be used as the raw material of downstream unit; The second extraction tower raffinate obtains after reclaiming solvent the second extraction tower that is rich in a ring and two Polycyclic aromatic hydrocarbons is raffinated oil, and can be used as aromatic rubber oil; The second extraction tower Extract obtains after reclaiming solvent the second extraction tower is extracted oil out, can be used as the condensed-nuclei aromatics oil that is rich in polycyclic aromatic hydrocarbons.The present invention has also reduced the treatment capacity that contains aldehyde water, has reduced plant energy consumption.
The accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the inventive method.
Embodiment
A kind of aldehyde-contained water of furfural extraction solvent recovery system utilize method, by furfural solvent input the first extraction tower top, with stock oil counter current contact in the first extraction tower; Using the raw material of the Extract of the first extraction tower as the second extraction tower, input the bottom of the second extraction tower, by the top of furfural solvent input the second extraction tower, the two is counter current contact in the second extraction tower, raffinates oil from the raffinate of the second extraction tower, isolating the second extraction tower; At the Extract of the first extraction tower with in entering the furfural solvent of the second extraction tower, inject and contain aldehyde water from furfural extraction solvent recovery system aldehyde water separation tank.
The quality of the furfural solvent that enters the first extraction tower of take is benchmark, and the amount that contains aldehyde water of injecting in the Extract of the first extraction tower is 1.0%～8.0%, is preferably 3.0%～6.0%.
The quality of the furfural solvent that enters the second extraction tower of take is benchmark, and the amount that contains aldehyde water of injecting in the furfural solvent that enters the second extraction tower is 1.0%～6.0%, is preferably 2.0%～5.0%.
Under preferable case, will contain aldehyde water and be injected in the first extraction tower Extract, after mixing tank mixes, then enter the second extraction tower.
Under preferable case, will contain aldehyde water and be injected in the first extraction tower Extract, after the interchanger cooling, then enter the second extraction tower.
In preferred situation, will contain aldehyde water and be injected in the first extraction tower Extract, first through mixing tank, mix, then, through the interchanger cooling, then enter the second extraction tower.
Under preferable case, will contain aldehyde water and be injected in the furfural solvent that enters the second extraction tower, after mixing tank mixes, then enter the second extraction tower.
Method of the present invention comprises, raffinates oil from the first extraction tower raffinate, isolating the first extraction tower.
Method of the present invention comprises, extracts oil out from the second extraction tower Extract, isolating the second extraction tower.
Described stock oil comprise crude oil Light lube oil, subtract three line distillates, subtract four line distillates, one or more in decompression wide fraction oil, solvent-deasphalted oils and their pressed oil.Described solvent-deasphalted oils is to take the vacuum residuum of crude oil to be raw material, and the propane of take produces as solvent.Described solvent dewaxing is to adopt organic solvent, filters at low temperatures the Light lube oil of removing crude oil, subtracts three line distillates, subtracts four line distillates, subtracts the high condensation point component in five line distillates, solvent deasphalting wet goods.
Of the present invention preferred embodiment a kind of below in conjunction with the accompanying drawing explanation.
Stock oil 9 enters from the first extraction tower 1 bottom, with the furfural solvent 10 entered from the first extraction tower top counter current contact the first extraction tower, the first extraction tower raffinate enters the first extraction tower raffinate solvent recovering system 3 through pipeline 11 and reclaims solvent, the aldehyde water mixture enters condensate cooler 7 through pipeline 12, cooled aldehyde water mixture enters after aldehyde water separation tank 8, the first extraction tower raffinates reclaim solvents and obtains the first extraction tower raffinate oil (not marking in figure) through pipeline 20.The first extraction tower Extract through pipeline 13 and interchanger 5 cooling after, through pipeline 14, enter extraction tower 2, with solvent 15 counter current contact the second extraction tower entered from the second extraction tower 2 tops.The second extraction tower raffinate enters the second extraction tower raffinate solvent recovering system 4 through pipeline 16 and reclaims solvent, the aldehyde water mixture enters condensate cooler 7 through pipeline 17, cooled aldehyde water mixture enters aldehyde water separation tank 8 through pipeline 20, after the second extraction tower raffinate recovery solvent, obtain the second extraction tower and raffinate oil (not marking in figure), namely be rich in the oil product of a ring and two Polycyclic aromatic hydrocarbons.The second extraction tower Extract enters Extract solvent recovering system 6 through pipeline 18 and reclaims solvent, dry solvent enters solvent seasoning tower (not marking in figure), the aldehyde water mixture enters condensate cooler 7 through pipeline 19, cooled aldehyde water mixture enters aldehyde water separation tank 8 through pipeline 20, the second extraction tower Extract obtains the second extraction tower extraction oil (not marking in figure) after reclaiming solvent, namely is rich in the condensed-nuclei aromatics oil of polycyclic aromatic hydrocarbons.Aldehyde water mixture after condensing cooling is divided into two-layer in aldehyde water separation tank 8, upper strata is the aqueous layer that contains aldehyde 6% left and right, and lower floor is the furfural solution layer of moisture 6% left and right, contains aldehyde aqueous solution baffle plate in aldehyde water separation tank 8 and flows into the opposite side in tank.The aldehyde aqueous solution that contains of a part goes dehydration tower to remove moisture content through pipeline 24, and dehydration tower top aldehyde water mixture enters the aldehyde water separation tank again after condensing cooling; Another part is used (not marking in figure) as raffinate stripping tower and extract stripper backflow; Some the aldehyde aqueous solution that contains has entered in the second extraction tower, for reducing the first extraction tower Extract and the second extraction tower furfural solvent dissolving power to few Polycyclic aromatic hydrocarbons.Enter the containing in the aldehyde aqueous solution of the second extraction tower, the aldehyde aqueous solution that contains of a part is injected in the first extraction tower Extract 13 through pipeline 21 and pipeline 22, after mixing tank mixes (not marking in figure) and interchanger 5 and lowers the temperature, enters the second extraction tower through pipeline 14; The aldehyde aqueous solution that contains of another part injects the second extraction tower solvent 15 through pipeline 21 and pipeline 23, after mixing tank mixes (not marking in figure), enters the second extraction tower.Moisture furfural solution removes the furfural drying tower through pipeline 25.
Below in conjunction with embodiment, the present invention is described further.
Embodiment 1
The 20 ℃ of density of take are 0.9685g/cm
3, 100 ℃ of kinematic viscosity are 38.52mm
2The four line distillates that subtract of/s are raw material, according to the first extraction tower Extract shown in Figure 1, enter into the flow process of the second extraction tower as the extracting raw material, the first extraction tower tower top temperature is 120 ℃, and column bottom temperature is 100 ℃, and the mass ratio of furfural solvent and stock oil is 1.5: 1.The first extraction tower furfural solvent quality of take is benchmark, and the amount that contains aldehyde water be injected in the first extraction tower Extract is 3.0%.The second extraction tower tower top temperature is 65 ℃, and column bottom temperature is 50 ℃, and the mass ratio of furfural solvent and stock oil is 0.5: 1, and the second extraction tower furfural solvent quality of take is benchmark, is 2.5% to the amount that contains aldehyde water of injecting in the second extraction tower solvent.First yield of raffinating oil is that 60.2%, the second yield of raffinating oil is 15.1%, and extracting oily yield out is 24.7%.Adopt mass spectroscopy compositions of raffinating oil, the second middle aromatic hydrocarbons mass content of raffinating oil is 72.3%, one to encircle and two Polycyclic aromatic hydrocarbons mass content are 65.1%.
Embodiment 2
The 20 ℃ of density of take are 0.9685g/cm
3, 100 ℃ of kinematic viscosity are 38.52mm
2The four line distillates that subtract of/s are raw material, according to the first extraction tower Extract shown in Figure 1, enter into the flow process of the second extraction tower as the extracting raw material, the first extraction tower tower top temperature is 120 ℃, and column bottom temperature is 100 ℃, and the mass ratio of furfural solvent and stock oil is 1.5: 1.The first extraction tower furfural solvent quality of take is benchmark, and the amount that contains aldehyde water be injected in the first extraction tower Extract is 6.0%.The second extraction tower tower top temperature is 78 ℃, column bottom temperature is 65 ℃, and the second extraction tower furfural solvent quality of take is benchmark, and the mass ratio of furfural solvent and stock oil is 0.7: 1, the second extraction tower furfural solvent quality of take is benchmark, is 5.0% to the amount that contains aldehyde water of injecting in the second extraction tower solvent.First yield of raffinating oil is that 60.2%, the second yield of raffinating oil is 15.8%, and extracting oily yield out is 24.0%.Adopt mass spectroscopy compositions of raffinating oil, the second middle aromaticity content content of raffinating oil is 73.5%, one to encircle and two Polycyclic aromatic hydrocarbons Contents are 65.4%.
Comparative Examples 1
Adopt the raw material identical with embodiment 1, according to the first extraction tower Extract shown in Figure 1, enter into the flow process of the second extraction tower as the extracting raw material, the first extraction tower tower top temperature is 120 ℃, and column bottom temperature is 100 ℃, and the mass ratio of furfural solvent and stock oil is 1.5: 1.In Extract, do not annotate and contain aldehyde water.The second extraction tower tower top temperature is 65 ℃, and column bottom temperature is 50 ℃, and the mass ratio of furfural solvent and stock oil is 0.5: 1, does not annotate and contains aldehyde water in the second extraction tower solvent.First yield of raffinating oil is that 60.2%, the second yield of raffinating oil is 9.7%, and extracting oily yield out is 30.1%.Adopt mass spectroscopy compositions of raffinating oil, the second middle aromatic hydrocarbons mass content of raffinating oil is 61.6%, one to encircle and two Polycyclic aromatic hydrocarbons mass content are 56.1%.
Claims (11)
- An aldehyde-contained water of furfural extraction solvent recovery system utilize method, by furfural solvent input the first extraction tower top, with stock oil counter current contact in the first extraction tower; Using the raw material of the Extract of the first extraction tower as the second extraction tower, input the bottom of the second extraction tower, by the top of furfural solvent input the second extraction tower, the two is counter current contact in the second extraction tower, raffinates oil from the raffinate of the second extraction tower, isolating the second extraction tower; It is characterized in that, at the Extract of the first extraction tower with in entering the furfural solvent of the second extraction tower, inject and contain aldehyde water from furfural extraction solvent recovery system aldehyde water separation tank.
- 2. in accordance with the method for claim 1, it is characterized in that, the quality of the furfural solvent that enters the first extraction tower of take is benchmark, and the amount that contains aldehyde water of injecting in the Extract of the first extraction tower is 1.0%～8.0%.
- 3. in accordance with the method for claim 2, it is characterized in that, the quality of the furfural solvent that enters the first extraction tower of take is benchmark, and the amount that contains aldehyde water of injecting in the Extract of the first extraction tower is 3.0%～6.0%.
- 4. in accordance with the method for claim 1, it is characterized in that, the quality of the furfural solvent that enters the second extraction tower of take is benchmark, and the amount that contains aldehyde water of injecting in the furfural solvent that enters the second extraction tower is 1.0%～6.0%.
- 5. in accordance with the method for claim 4, it is characterized in that, the quality of the furfural solvent that enters the second extraction tower of take is benchmark, and the amount that contains aldehyde water of injecting in the furfural solvent that enters the second extraction tower is 2.0%～5.0%.
- 6. in accordance with the method for claim 1, it is characterized in that, will contain aldehyde water and be injected in the first extraction tower Extract, after the interchanger cooling, then enter the second extraction tower.
- 7. in accordance with the method for claim 6, it is characterized in that, will contain aldehyde water and be injected in the first extraction tower Extract, first through mixing tank, mix, then, through the interchanger cooling, then enter the second extraction tower.
- 8. in accordance with the method for claim 1, it is characterized in that, will contain aldehyde water and be injected in the furfural solvent that enters the second extraction tower, after mixing tank mixes, then enter the second extraction tower.
- 9. in accordance with the method for claim 1, it is characterized in that, raffinate oil from the first extraction tower raffinate, isolating the first extraction tower.
- 10. in accordance with the method for claim 1, it is characterized in that, extract oil out from the second extraction tower Extract, isolating the second extraction tower.
- 11. in accordance with the method for claim 1, it is characterized in that, described stock oil comprise crude oil Light lube oil, subtract three line distillates, subtract four line distillates, one or more in decompression wide fraction oil, solvent-deasphalted oils and their pressed oil.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1107174A (en) * | 1994-11-15 | 1995-08-23 | 荆门石油化工研究院 | Reusing method for extracted solution of lubricating oil solvent |
| CN101597512A (en) * | 2009-07-14 | 2009-12-09 | 中国海洋石油总公司 | Environment-friendly rubber oil and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1107174A (en) * | 1994-11-15 | 1995-08-23 | 荆门石油化工研究院 | Reusing method for extracted solution of lubricating oil solvent |
| CN101597512A (en) * | 2009-07-14 | 2009-12-09 | 中国海洋石油总公司 | Environment-friendly rubber oil and preparation method thereof |
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