CN209508158U - A kind of extraction distillation tower - Google Patents
A kind of extraction distillation tower Download PDFInfo
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- CN209508158U CN209508158U CN201821516498.7U CN201821516498U CN209508158U CN 209508158 U CN209508158 U CN 209508158U CN 201821516498 U CN201821516498 U CN 201821516498U CN 209508158 U CN209508158 U CN 209508158U
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- feed pipe
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- extraction
- distillation tower
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Abstract
The utility model relates to a kind of extraction distillation towers, including exhausting section, extraction section and rectifying section, the exhausting section includes recycling packing layer, takes out pressure chamber and the second return pipe, the top taken out pressure chamber and be located at the recycling packing layer, the both ends of second return pipe are separately connected the upper end and the upper end for taking out pressure chamber of the recycling packing layer；The extraction section includes column plate and the first feed pipe, and the both ends of first feed pipe are separately connected the lower end of the column plate and the upper end of the recycling packing layer；Second feed pipe is set between the exhausting section and the extraction section, is provided with the filtering tank with thermo detector on second feed pipe；The rectifying section includes float valve filler plate and packing area；It is provided with the first discharge nozzle below the rectification zone, is provided with the return pipe with reboiler on first discharge nozzle.Temperature pure and appropriate is kept into the barren solution in tower, avoids influencing the dissolution of styrene because of the temperature difference, avoids the appearance of Two Liquid Phases, realize single liquid phase extractive distillation.
Description
Technical field
The utility model relates to the fractionation fields of drippolene, and in particular to a kind of extraction distillation tower.
Background technique
The ethylbenzene containing 30wt% or more and styrene mixed component, pyrolysis gasoline hydrogenation are anti-in drippolene C8+ fraction
Seasonable styrene conversion is ethylbenzene, causes the waste of a large amount of styrene resources, a large amount of ethylbenzene also can be to the product of mixed xylenes
Matter impacts.Using styrene extraction device, drippolene styrene extraction process is used before pyrolysis gasoline hydrogenation, from splitting
It is pre-separated out styrene in solution gasoline C8+ fraction, the consumption of hydrogen is reduced, improves the service life of hydrogenation catalyst, obtain high-purity
Styrene.Drippolene styrene extraction process include prefractionation, selective hydrogenation, extractive distillation and styrene refine this four
A technique unit, wherein extractive distillation unit includes extractive distillation (ED) tower, solvent recovery tower and solvent regeneration system.Extract into
Material is C8 fraction after the selective hydrogenation from pretreatment unit, using sulfolane double solvents (efficient) to styrene and C8 virtue
Hydrocarbon relative volatility influences different basic principles, by proposing the separation taken out rectifying and realize styrene and C8 aromatic hydrocarbons, obtained production
Product are that crude styrene and C8 raffinate oil.
The control target of extraction distillation tower be make tower bottom flow out styrenic component in solvent content be less than 1000ppm, and
Styrene and arene content should be less than 1.0% in the solvent of recovered overhead, guarantee that the key of product quality and yield is to ensure that this
Tower steady operation avoids the formation of liquid-liquid three-phase in single liquid phase region.The prior art generally passes through control tower pressure, solvent ratio and molten
The operation indexs such as agent water content realize single liquid phase work of extraction distillation tower, complicated for operation, it is difficult to realize stability contorting.
Utility model content
The purpose of this utility model is to provide a kind of extraction distillation tower, solve to realize in extraction distillation tower in the prior art
When single liquid phase works, the operating parameters such as tower pressure, solvent ratio and the solvent water content of extraction distillation tower need to be controlled, it is complicated for operation, surely
Fixed operation difficult the problem of realizing.
To achieve the above object, the utility model provides the following technical solutions: a kind of extraction distillation tower, including exhausting section,
Extraction section and rectifying section, the exhausting section include recycling packing layer, take out pressure chamber and the second return pipe, and the pumping pressure chamber is located at described
The top of packing layer is recycled, the both ends of second return pipe are separately connected the upper end for recycling packing layer and the pumping pressure chamber
Upper end, second return pipe includes diversion cans；The extraction section includes column plate and the first feed pipe, first feed pipe
Both ends be separately connected the column plate lower end and it is described recycling packing layer upper end；Between the exhausting section and the extraction section
Second feed pipe is set, is provided with the filtering tank with thermo detector on second feed pipe；The rectifying section include laminate area and
Packing area, the packing area are located at the lower section in the laminate area；It is provided with the first discharge nozzle below the rectifying section, described first
The return pipe with reboiler is provided on discharge nozzle.
Further, water ring vacuum pump is provided in the pumping pressure chamber.Water ring vacuum pump can extract misty gas,
Water ring vacuum pump is arranged in extraction distillation tower upper end, and air pressure in tower is made to maintain negative pressure state, while avoiding the gas of distillation to pumping
Pressure has an impact, and makes tower pressure keep stablizing, material evaporation is stablized in tower.
Further, flow controller is provided on first feed pipe, first feed pipe connects the column plate
Lower end at be provided with thermo detector.Raw material C8 fraction is entered in drawer destilling tower by the first feed pipe, passes through flow controller
The inlet of raw material C8 fraction is controlled, while thermo detector real-time detection feeding temperature is set, feeding temperature is made to be maintained at appropriate
In temperature range, avoid Two Liquid Phases occur because of sulfolane double solvents and raw material excessive temperature differentials, while guaranteeing the dissolution of styrene
Power.
Further, the theoretical number of plies of the float valve filler plate is greater than 60, and the float valve filler plate includes downspout, overflow
Plate, filling block, stomata and column plate, the downspout are located at the side of the column plate, and it is close that the overflow plate is located at the column plate
The side of the downspout, the stomata are evenly distributed on the column plate, and the top of the stomata is arranged in the filling block.
In the float valve filler plate that extraction section setting is sufficient, makes to be passed through the raw material C8 fraction gas in extraction distillation tower and pass through float valve filler plate
On stomata and top filling block, the sulfolane double solvents that top is fallen is sufficiently mixed in filling block with unstrpped gas
Even, styrene is substantially dissolved in sulfolane double solvents.
Further, the third feed pipe with measuring fixed amount pump is provided with above the rectifying section.Styrene is easily certainly
It is poly-, it is quantitatively pumped into above appropriate polymerization inhibitor to the rectifying section of extraction distillation tower by third feed pipe, makes polymerization inhibitor and lower section essence
The compound benzene-enriched ethylene solvent mixing of sulfolane for evaporating section, reduces the loss of styrene, increases the yield of styrene.
Further, cooler is provided on first feed pipe, second isocon and second feed pipe.
Cooler is set on feed pipe, and control enters the temperature of charge in extraction distillation tower, avoids because of the excessively high influence benzene second of temperature
Solvability of the alkene in sulfolane double solvents.
Further, the packing area includes the laminate being mutually inclined, and the theoretical number of plies is 20~30.In rectifying section, phase is set
Mutual inclined laminate, makes the compound benzene-enriched ethylene solvent of sulfolane extracted by top be slowly drop down to the packing area of lower section, keeps away
Exempt from styrene mother solution because acute variation occurs in fast drop course, while making the polymerization inhibitor and ring of top third feed pipe injection
The compound benzene-enriched ethylene solvent of fourth sulfone is sufficiently mixed, and styrene is avoided autohemagglutination occur.
Compared with prior art, the utility model has the beneficial effects that exhausting section, extraction section are arranged in extraction distillation tower
And rectifying section makes air pressure in tower maintain negative regulation state, above extraction section by the way that vacuum pump is arranged above exhausting section
It is provided with the filtering tank with thermo detector on second feed pipe, carries out temperature control after lean solvent filtering sundries, makes to enter poor molten in tower
Liquid keeps temperature pure and appropriate, avoids influencing the dissolution of styrene because of the temperature difference, avoids the appearance of Two Liquid Phases, realizes single liquid phase
Extractive distillation；Extraction section is provided with float valve filler plate simultaneously, fills sulfolane double solvents in extraction section with unstrpped gas
Divide and be uniformly mixed, styrene is substantially dissolved in sulfolane double solvents.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor
Under, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is the overall structure diagram of extraction distillation tower；
Fig. 2 is the structural schematic diagram of float valve filler plate.
In appended drawing reference: 1, extraction distillation tower, 2, recycling packing layer, 3, float valve filler plate, 304, downspout, 303, overflow
Plate, 301, filling block, 302, stomata, 305, column plate, 4, packing area, 5, laminate area, the 6, first feed pipe, 601, flow control
Device, 7, thermo detector, the 8, first discharge nozzle, 801, reboiler, 802, return pipe, the 9, second return pipe, 901, diversion cans, 10, water
Ring vacuum pump, 1001, pumping pressure chamber, the 11, second feed pipe, 1101, filtering tank, 12, third feed pipe, 1201, measuring fixed amount pump,
13, cooler.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describing, it is clear that described embodiment is only the embodiment of the utility model a part, rather than all
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
Every other embodiment obtained, fall within the protection scope of the utility model.
Refering to fig. 1-2, the utility model provides a kind of technical solution, a kind of extraction distillation tower 1, including exhausting section, extraction
Section and rectifying section, the exhausting section include recycling packing layer 2, taking out pressure chamber 1001 and the second return pipe 9, and described pumping pressure chamber 1001
In it is described recycling packing layer 2 top, the both ends of second return pipe 9 be separately connected it is described recycling packing layer 2 upper end with
The upper end for taking out pressure chamber 1001, second return pipe 9 include diversion cans 901；The extraction section include column plate and first into
Expects pipe 6, the both ends of first feed pipe 6 are separately connected the lower end of the column plate and the upper end of the recycling packing layer 2；It is described
Second feed pipe 11 is set between exhausting section and the extraction section, is provided with the mistake with thermo detector 7 on second feed pipe 11
Filter tank 1101；The rectifying section includes laminate area 5 and packing area 4, and the packing area 4 is located at the lower section in the laminate area 5；Institute
It states and is provided with the first discharge nozzle 8 below rectifying section, be provided with the return pipe with reboiler 801 on first discharge nozzle 8
802。
Water ring vacuum pump 10 is provided in the pumping pressure chamber 1001.Water ring vacuum pump 10 can extract misty gas,
Water ring vacuum pump 10 is arranged in 1 upper end of extraction distillation tower, and air pressure in tower is made to maintain negative pressure state, while avoiding the gas pair of distillation
It takes out pressure to have an impact, makes tower pressure keep stablizing, material evaporation is stablized in tower.
Flow controller 601 is provided on first feed pipe 6, first feed pipe 6 connects under the column plate
Thermo detector 7 is provided at end.Raw material C8 fraction is entered in drawer destilling tower by the first feed pipe 6, passes through flow controller 601
The inlet of raw material C8 fraction is controlled, while 7 real-time detection feeding temperature of thermo detector is set, feeding temperature is made to be maintained at appropriate
In temperature range, avoid Two Liquid Phases occur because of sulfolane double solvents and raw material excessive temperature differentials, while guaranteeing the dissolution of styrene
Power.
The theoretical number of plies of the float valve filler plate 3 is greater than 60, and the float valve filler plate 3 includes downspout 304, overflow plate
303, filling block 301, stomata 302 and column plate 305, the downspout 304 are located at the side of the column plate 305, the overflow plate
303 are located at the column plate 305 close to the side of the downspout 304, and the stomata 302 is evenly distributed on the column plate 305,
The top of the stomata 302 is arranged in the filling block 301.In the float valve filler plate 3 that extraction section setting is sufficient, make to be passed through pumping
The raw material C8 fraction gas in destilling tower 1 is mentioned by stomata 302 and top filling block 301 on float valve filler plate 3, top is fallen
Sulfolane double solvents be sufficiently mixed in filling block 301 with unstrpped gas uniformly, it is multiple that styrene is substantially dissolved in sulfolane
In bonding solvent.
The third feed pipe 12 with measuring fixed amount pump 1201 is provided with above the rectifying section.Styrene easily autohemagglutination,
It is quantitatively pumped into above appropriate polymerization inhibitor to the rectifying section of extraction distillation tower 1 by third feed pipe 12, makes polymerization inhibitor and lower section essence
The compound benzene-enriched ethylene solvent mixing of sulfolane for evaporating section, reduces the loss of styrene, increases the yield of styrene.
Cooler 13 is provided on first feed pipe 6, second isocon and second feed pipe 11.Into
Cooler 13 is set on pipe material, and control enters the temperature of charge in extraction distillation tower 1, avoids because of the excessively high influence styrene of temperature
Solvability in sulfolane double solvents.
The packing area 5 includes the laminate being mutually inclined, and the theoretical number of plies is 20~30.It is mutually inclined in rectifying section setting
Laminate makes the compound benzene-enriched ethylene solvent of sulfolane extracted by top be slowly drop down to the packing area 4 of lower section, avoids sulfolane
Compound benzene-enriched ethylene solvent makes the polymerization inhibitor of 12 injection of top third feed pipe because acute variation occurs in fast drop course
It is sufficiently mixed with the compound benzene-enriched ethylene solvent of sulfolane, styrene is avoided autohemagglutination occur.
The working principle of the utility model is: extraction distillation tower, which takes out the Water-ring vacuum pump depletion in pressure chamber by top, to be made to take out
It mentions destilling tower and maintains negative pressure state, raw material C8 fraction gas is entered by the first feed pipe with flow controller and thermo detector
The middle part of ED tower, unstrpped gas part rise to the extraction section of top, pass through after the water cooled device temperature adjustment of the compound lean solvent of sulfolane
Enter the top of extraction section after filtering tank elimination foul by the second feed pipe, unstrpped gas and the compound lean solvent of sulfolane are floating
It is sufficiently mixed at valve filler plate and recycling packing layer, the styrene in unstrpped gas is substantially dissolved in the compound lean solvent of sulfolane
In, the compound benzene-enriched ethylene solvent of sulfolane is fallen in the rectification zone of lower section, has been extracted the C8 fraction gas of styrenic component
The second return pipe is continued to rise to, diversion cans are entered after cooler and carry out water-oil separating, separates water and part C8 fraction difference
Bleeder, remaining C8 fraction pass back into extraction distillation tower with recovery section sulfolane double solvents；It is fed simultaneously by third
Pipe is quantitatively pumped into above appropriate polymerization inhibitor to rectifying section, and the compound benzene-enriched ethylene solvent of sulfolane of top extraction is slow by laminate area
Slowly the packing area of lower section is dropped to, while making the polymerization inhibitor and the compound benzene-enriched ethylene solvent of sulfolane of top third feed pipe injection
It is sufficiently mixed, the compound benzene-enriched ethylene solvent of sulfolane flows out extraction distillation tower by the first discharge nozzle, and part rich solvent passes through band
There is the return pipe of reboiler to be back in tower.
Compared with prior art, the utility model has the beneficial effects that exhausting section, extraction are arranged in extraction distillation tower 1
Section and rectifying section take out pressure chamber by setting above exhausting section, so that air pressure in tower is maintained negative regulation state, above extraction section
The second feed pipe 11 on be provided with the filtering tank 1101 with thermo detector 7, carry out temperature control after lean solvent filtering sundries, make to enter tower
Interior barren solution keeps temperature pure and appropriate, avoids influencing the dissolution of styrene because of the temperature difference, avoids the appearance of Two Liquid Phases, real
Now single liquid phase extractive distillation；Extraction section is provided with float valve filler plate 3 simultaneously, make sulfolane double solvents in extraction section with original
Material gas is sufficiently mixed uniformly, and styrene is substantially dissolved in sulfolane double solvents.
The above content is combine specific embodiment further detailed description of the utility model, and it cannot be said that
The specific implementation of the utility model is confined to described above.To those skilled in the art, this reality is not being departed from
With above embodiments can be carried out with several simple deduction or replace under the premise of novel design, the scope of the utility model is by institute
Attached claim and its equivalent limit.
Claims (7)
1. a kind of extraction distillation tower, including exhausting section, extraction section and rectifying section, which is characterized in that the exhausting section includes recycling
Packing layer takes out pressure chamber and the second return pipe, and the pressure chamber of taking out is located at the top for recycling packing layer, second return pipe
Both ends are separately connected the upper end and the upper end for taking out pressure chamber of the recycling packing layer, and second return pipe includes diversion cans；
The extraction section includes column plate and the first feed pipe, and the both ends of first feed pipe are separately connected lower end and the institute of the column plate
State the upper end of recycling packing layer；Second feed pipe is set between the exhausting section and the extraction section, on second feed pipe
It is provided with the filtering tank with thermo detector；The rectifying section includes float valve filler plate and packing area, and the packing area is located at described floating
The lower section of valve filler plate；It is provided with the first discharge nozzle below the rectifying section, is provided on first discharge nozzle with reboiling
The return pipe of device.
2. a kind of extraction distillation tower according to claim 1, which is characterized in that be provided with Water-ring vacuum in the pumping pressure chamber
Pump.
3. a kind of extraction distillation tower according to claim 1, which is characterized in that be provided with flow control on first feed pipe
Device processed, first feed pipe connect and are provided with thermo detector at the lower end of the column plate.
4. a kind of extraction distillation tower according to claim 1, which is characterized in that the theoretical number of plies of the float valve filler plate is greater than
60, the float valve filler plate includes downspout, overflow weir, filling block, through-hole and column plate, and the downspout is located at the column plate
Side, the overflow weir are located at the column plate close to the side of the downspout, and the through-hole is evenly distributed on the column plate,
The top of the through-hole is arranged in the filling block.
5. a kind of extraction distillation tower according to claim 1, which is characterized in that it is quantitative to be provided with band above the rectifying section
The third feed pipe of metering pump.
6. a kind of extraction distillation tower according to claim 2, which is characterized in that first feed pipe, second reflux
Pipe, second feed pipe and the vacuum pump and the extraction distillation tower junction are provided with cooler.
7. a kind of extraction distillation tower according to claim 1, which is characterized in that the packing area includes the layer being mutually inclined
Plate, the theoretical number of plies are 20~30.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821516498.7U CN209508158U (en) | 2018-09-17 | 2018-09-17 | A kind of extraction distillation tower |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821516498.7U CN209508158U (en) | 2018-09-17 | 2018-09-17 | A kind of extraction distillation tower |
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| Publication Number | Publication Date |
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| CN209508158U true CN209508158U (en) | 2019-10-18 |
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| CN201821516498.7U Active CN209508158U (en) | 2018-09-17 | 2018-09-17 | A kind of extraction distillation tower |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114470834A (en) * | 2020-10-27 | 2022-05-13 | 湖南中岭化工有限责任公司 | Crude benzene hydrogenation extraction device |
-
2018
- 2018-09-17 CN CN201821516498.7U patent/CN209508158U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114470834A (en) * | 2020-10-27 | 2022-05-13 | 湖南中岭化工有限责任公司 | Crude benzene hydrogenation extraction device |
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