CN207862264U - A kind of solvent depth retracting device of Aromatics Extractive Project extraction rectification technique - Google Patents
A kind of solvent depth retracting device of Aromatics Extractive Project extraction rectification technique Download PDFInfo
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- CN207862264U CN207862264U CN201721924501.4U CN201721924501U CN207862264U CN 207862264 U CN207862264 U CN 207862264U CN 201721924501 U CN201721924501 U CN 201721924501U CN 207862264 U CN207862264 U CN 207862264U
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- solvent
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- aromatic hydrocarbons
- solvent recovery
- stripper
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Abstract
The utility model is related to chemical separation engineering aromatic hydrocarbons extraction rectifying/extraction technique domain, more particularly to the solvent depth retracting device of a kind of Aromatics Extractive Project extraction rectification technique.Its structure includes solvent recovery tower, solvent recovery tower is for detaching the rich solvent containing aromatic hydrocarbons, the solvent recovery top of tower is connected with condenser in turn by pipeline, return tank and reflux pump, the reflux pump passes through the return line connection solvent recovery tower, the piping connection external world is produced by product, the bottom of the solvent recovery tower is respectively by piping connection solvent recovery bottom of tower pump and solvent stripper, and the solvent stripper is for the aromatic hydrocarbons contained in lean solvent to be stripped off.A kind of solvent depth retracting device of the Aromatics Extractive Project extraction rectification technique of the utility model, can solve the problems, such as the solvent recovering system solvent under the prior art be not properly separated with aromatic hydrocarbons, solvent recovery it is incomplete.
Description
Technical field
The utility model is related to chemical separation engineering aromatic hydrocarbons extraction rectifying/extraction technique domain, more particularly to a kind of aromatic hydrocarbons is taken out
Carry the solvent depth retracting device of extraction rectification technique.
Background technology
Aromatic hydrocarbons is one of most important industrial chemicals, and the main source that the mankind obtain aromatic hydrocarbons is petroleum distillate.Most often at present
Aromatics Production Technology is Aromatics Extractive Project/extraction and distillation technology, is waved using solvent raising aromatic hydrocarbons and the opposite of non-aromatics
Hair degree, to which the aromatic hydrocarbons in oil to be kept completely separate with non-aromatics.BTX aromatics obtained by oil pass through conventional distillation point again
From, and then purified petroleum benzin (B) is obtained, toluene (T) and dimethylbenzene (X) etc., this is now most important a kind of bulk chemical.Profit at present
The main petroleum that aromatic hydrocarbons is obtained with aromatic hydrocarbons extraction distillation technology includes that catalytic reforming generates oily (CRO), steam cracking lighter hydrocarbons
The naphtha (PYGAS) of by-product, the crude benzol (COLO) of coal tar, cat cracked naphtha etc..
It is Aromatics Extractive Project/extraction rectification technique of solvent since investment is low, aromatic hydrocarbon product is high-quality, energy consumption for it using sulfolane
The features such as low, high income, extensive commercial Application is obtained.Modern Aromatics Extractive Project/extracting rectifying device includes mainly that aromatic hydrocarbons is taken out
Carry/extracting rectifying and solvent recovery two parts.In extracting/extracting rectifying part, the aromatic hydrocarbons in charging is absorbed into solvent, non-
Aromatic hydrocarbons is from overhead extraction；In Solvent recovery portion, aromatic hydrocarbons rises to overhead extraction, and lean solvent is recycled in tower reactor.So
Lean solvent can be recycled to extracting/extracting rectifying part afterwards, absorb aromatic hydrocarbons again.
Fresh solvent does not have impurity, very good in extracting/extraction partial properties；But in Solvent recovery portion, on a small quantity
Aromatic hydrocarbons can not be completely out next from lean solvent, and extracting/extraction ability of lean solvent is caused slowly to decline.Ideally ring fourth
Sulfone can be deteriorated slowly as main solvent in cyclic process, generate minimal amount of acidic materials.PPM amounts are added in a solvent
The weak base such as MEA (ethanol amine), it will be able to reduce the acidity of solvent, reduce corrosivity；And modern Aromatics Extractive Project/extracting rectifying
Solvent reclamation Tower System can be all arranged in system, can regenerate a small amount of lean solvent, to arrange a part of macromolecule polyalcohol
Except system.However due in solvent regeneration tower a small amount of aromatic hydrocarbons can not be separated from lean solvent completely, this is greatly reduced
Extracting/extracting power of aromatic hydrocarbons.
In order to ensure that Aromatics Extractive Project/extracting power of device, operating personnel have to operate under harsh operating condition,
It is namely operated under more high solvent ratio and higher recovered temperature, this is further degrading operating condition, accelerates the bad of solvent
Change the corrosion with equipment.In general, partial devices are had to parking maintenance after driving 4 or five years, solvent is replaced completely, it is rotten
The equipment of erosion is also required to be handled.This will cause larger economic loss and environmental protection pressure, on the one hand because sweetening agent is high
Expensive, another aspect solvent is sulfide, deals with and inevitably causes environmental pollution.Therefore for Aromatics Extractive Project/extraction
Rectifier unit ensures going for the macromolecule polyalcohol generated in depth recycling, the deterioration for preventing solvent and the solvent of lean solvent
Except being very crucial technology.
The problem of for Aromatics Extractive Project/extracting rectifying device,《Aromatic hydrocarbon extraction solvent regeneration new process is in actual production
Using》(《Oil Refining Technologies and engineering》, 2004,34 (7)：23-25) literary grace removes macromolecule polyalcohol with filtering technique, ensures
Solvent cleans, efficiently.However since these polymer are molecule ranks, mechanical filtering method is difficult to remove, practical application effect
Fruit is also just not satisfactory.Lee race light (a kind of regeneration methods of aromatic hydrocarbon extraction solvent of CN1062007C) proposes the side of solvent reclamation
Method.Zhou Shiwei (CN201520824691.7, a kind of extraction solvent recycling system) also attempts to utilize interpolation type reboiler
Etc. means extraction solvent recycling system is improved.
Invention content
In order to solve problems in the prior art, the utility model provides a kind of solvent of Aromatics Extractive Project extraction rectification technique
Depth retracting device, can solve that solvent recovering system solvent under the prior art is not properly separated with aromatic hydrocarbons, solvent returns
Receive incomplete problem.
Technical solution used by the utility model is as follows：
A kind of solvent depth retracting device of Aromatics Extractive Project extraction rectification technique, including solvent recovery tower, the solvent
For recovery tower for detaching the rich solvent containing aromatic hydrocarbons, the solvent recovery top of tower is connected with condenser in turn by pipeline,
Return tank and reflux pump, the reflux pump produce pipeline by the return line connection solvent recovery tower by product
Connection is extraneous, and the bottom of the solvent recovery tower passes through piping connection solvent recovery bottom of tower pump and solvent stripper, institute respectively
The solvent stripper stated is for the aromatic hydrocarbons contained in lean solvent to be stripped off.
Solvent stripper includes tank body, and steam pre-distributor, distribution of steam are from bottom to top disposed in the tank body
Device, contactor and solvent distributor, the tank base are provided with stripped vapor entrance and lean solvent outlet, the tank body
Top is provided with containing aromatic hydrocarbon steam outlet and import containing aromatic solvent.
The lean solvent of solvent recovery tower bottom flows into the solvent stripper after catch box is collected by gravity.
Solvent stripper is vacuum.
In the utility model, the rich solvent for having fully absorbed aromatic hydrocarbons come from extractive distillation column or Aromatics Extractive Project tower,
Initially enter the middle part of solvent recovery tower.Solvent recovery tower overhead reflux tank extraction extracting aromatic hydrocarbons；Solvent recovery tower lower part it is poor
Solvent flows into solvent stripper after catch box is collected by gravity.The stripped vapor that solvent reclamation tank is sent simultaneously enters molten
In the steam distributor of agent stripper, solvent stripper is entered after the good distribution of distributor, then passes through bubble and liquid
The continuous contact and disengaging of film continuously will be in lean solvents along with the bubbling of solvent stripper internal heater wall surface acts on
The aromatic hydrocarbons contained is stripped off, these aromatic hydrocarbons, which enter gas phase and return solvent recovery tower, rises to tower top, is plucked out of as product；
The lean solvent in solvent stripper has also obtained depth recycling simultaneously, no longer contains aromatic hydrocarbons, can be recycled back to Aromatics Extractive Project/extraction
Rectifying part absorbs aromatic hydrocarbons with superior performance.
The steam distributor of solvent stripper, when flowing to pressure lower region from pressure upper zone using gas, due to
The characteristics of reduction of itself potential energy can generate suction force, promotes the heat and mass of gas vapor and lean solvent.Solvent reclamation tank pressure
Power is slightly higher, and solvent stripper operates under vacuum completely, and pressure is relatively low.Using steam from the slightly higher region of pressure enter pressure compared with
Low area can generate the principle of suction force so that thus the steam distributor of rational design can be carried with suction part lean solvent
High Srteam Stripping effect.
Lean solvent stripper, by stripped vapor good distribution, keeps it good fit between heating tube using distributor, from
And the lean solvent being stripped is made to be sufficiently heated, so that lean solvent is fully stripped under low pressure, low temperature, aromatic hydrocarbons quilt therein
It drives out of and completely, be plucked out of into solvent recovery tower top.
The advantageous effect that technical solution provided by the utility model is brought is：
The utility model promotes aromatic hydrocarbons in solvent using the update of solvent distributor and the bubbling and liquid film of contactor
Mass transfer and diabatic process, accelerate aromatic hydrocarbons vaporescence from solvent；To ensure in less harsh process condition
Under (under lower temperature and pressure), it is complete that solvent has obtained recycling, is kept completely separate with aromatic hydrocarbons.Solvent recovery bottom of tower and molten in this way
Agent stripper avoids accumulation of the aromatic hydrocarbons in solvent using lower operation temperature.
After this technology, the operation temperature of solvent recovery tower and solvent stripper can only have 160~165 DEG C, this is less than
Common solvent recovery bottom temperature.Under this lower temperature, the non-normal temperature of performance of solvent will not deteriorate, in this way
It can ensure the operation of device reliably and with long-term, not need parking maintenance and change the outfit solvent.Still further aspect, temperature is low to mean solvent
Low energy consumption for recovery section, generally can be lower by 5~10% than common Aromatics Extractive Project/extracting rectifying device.
To sum up, the utility model can improve the lean solvent recycling of Aromatics Extractive Project/extracting rectifying device Solvent recovery portion
Depth reduces aromatic hydrocarbons entrainment, can reduce the cycle lean solvent amount and operation temperature of device in this way, finally reduce plant energy consumption
The ability run steadily in the long term with the loadings of solvent, raising device.
Description of the drawings
It is required in being described below to embodiment in order to illustrate more clearly of the technical scheme in the embodiment of the utility model
Attached drawing to be used is briefly described, it should be apparent that, the accompanying drawings in the following description is only some realities of the utility model
Example is applied, it for those of ordinary skill in the art, without creative efforts, can also be according to these attached drawings
Obtain other attached drawings.
Fig. 1 is a kind of structural principle of the solvent depth retracting device of Aromatics Extractive Project extraction rectification technique of the utility model
Figure；
Fig. 2 is a kind of solvent stripping of the solvent depth retracting device of Aromatics Extractive Project extraction rectification technique of the utility model
The structure principle chart of device.
Specific implementation mode
It is new to this practicality below in conjunction with attached drawing to keep the purpose of this utility model, technical solution and advantage clearer
Type embodiment is described in further detail.
Embodiment one
As shown in attached drawing 1,2, a kind of solvent depth retracting device of Aromatics Extractive Project extraction rectification technique, including solvent recovery
Tower 1, solvent recovery tower 1 are sequentially connected for detaching the rich solvent containing aromatic hydrocarbons, 1 top of solvent recovery tower by pipeline
There are condenser 2, return tank 3 and reflux pump 4, the reflux pump 4 to connect the solvent recovery tower 1 by return line 5, leads to
It crosses product extraction pipeline 6 and connects the external world, the bottom of the solvent recovery tower 1 is pumped by piping connection solvent recovery bottom of tower respectively
7 and solvent stripper 8, the solvent stripper 8 is for the aromatic hydrocarbons contained in lean solvent to be stripped off.
Solvent stripper 8 includes tank body 81, and steam pre-distributor 82 is from bottom to top disposed in the tank body 81, is steamed
Vapour distributor 83, contactor 85 and solvent distributor 84,81 bottom of tank body are provided with stripped vapor entrance 86 and poor molten
Agent outlet 87,81 top of tank body are provided with containing aromatic hydrocarbon steam outlet 88 and import containing aromatic solvent 89.
The lean solvent of solvent recovery tower bottom flows into the solvent stripper after catch box is collected by gravity.
Solvent stripper is vacuum.
Solvent stripper is vertical or horizontal.It can also be bubble type, can also be falling film type.Lean solvent can be with
Tube side is walked, shell side can also be walked.
Below according to passing through some specific examples, it was demonstrated that the utility model and industrial normal aromatic hydrocarbon extracting/extraction at present
Rectifier unit solvent recovery process is compared, and purpose and effect are more notable.
Example one：
Certain mixed hydrogenation gasoline feeding extracts essence to add based on hydrogen C6/C7 using a kind of Aromatics Extractive Project of the utility model
The solvent depth retracting device for evaporating technique, is installed horizontal solvent stripper, is heated using middle pressure steam, and device produces grade oil benzene
With toluene product.Since solvent recovery ability protrudes, cycle sweetening agent is small, and bottom temperature only has 163 DEG C, vapor flow of stripper
It is smaller.Therefore extracting rectifying device, unit aromatic hydrocarbons energy consumption only have 24KG standard oils, comprehensive steam consumption to be filled than conventional extraction rectifying
Reduction by 15% is set, economic benefit is huge.
Example two：
Certain drippolene is fed, and to add based on hydrogen C6/C7/C8, produces aromatic hydrocarbon product using extraction and distillation technology, especially
Be vertical solvent stripper separation lean solvent and aromatic hydrocarbons, alkane ability it is very outstanding, can be by solvent recovery tower reactor lean solvent
It is kept completely separate with aromatic hydrocarbons (including cycloalkane), so that it is guaranteed that the good extracting power of solvent.The present apparatus can produce grade oil benzene,
Toluene and xylene product, this is the former unexistent ability of ordinary skill at present.Further, since using individual solvent vapour
Carry device, solvent recovery tower reactor diameter is there is no expanding, so the solvent loadings of device will reduce 20% than conventional equipment, this is not
It mean onlys that the expense of solvent filling for the first time reduces, and means that the production process air leakage such as amount in system is also reduced.This
For device is long-term, reliably operation provides guarantee.
Example three：
Certain existing apparatus processes reformation light naphthar, production benzene, toluene using existing normal aromatic hydrocarbon extraction and distillation technology
Product.Occur after the operation of this device aromatic hydrocarbons in solvent recovery bottom temperature higher (up to 180 DEG C), lean solvent can not remove it is dry
Only, the phenomenon that reboiler seriously corroded, with the increase of device lifetime, this phenomenon is more serious, while energy consumption increase also surpasses
The range of planning approval is gone out.Using a kind of solvent depth retracting device of Aromatics Extractive Project extraction rectification technique of the utility model
It is transformed, Solvent recovery portion pipeline, tower internals and automatic instrument(s) is slightly transformed, increase solvent stripper, then bottom temperature
167 DEG C can be reduced to, aromatic hydrocarbons can not remove totally in lean solvent.Then the energy consumption of device can also reduce by 10% or so.
Example four：
Certain blend gasoline produces aromatic hydrocarbon product using Aromatic Extraction Process, since part of gasoline supplied materials contains alkene, adopts
With solvent depth recovery technology come recycling design, while producing grade oil benzene, toluene product.Due to using the one of the utility model
The solvent depth retracting device of kind Aromatics Extractive Project extraction rectification technique, solvent recovery ability is higher, and rectifying tower reactor temperature is relatively low, molten
Agent will not deteriorate as acidity, even if there are alkene for charging, (163 DEG C) will not gather under present apparatus operation temperature
It closes.Since bottom temperature is low, plant energy consumption also lower than common device 12%.
The above is only the preferred embodiment of the present invention, is not intended to limit the utility model, all in this practicality
Within novel spirit and principle, any modification, equivalent replacement, improvement and so on should be included in the guarantor of the utility model
Within the scope of shield.
Claims (4)
1. a kind of solvent depth retracting device of Aromatics Extractive Project extraction rectification technique, including solvent recovery tower, which is characterized in that institute
For detaching the rich solvent containing aromatic hydrocarbons, the solvent recovery top of tower is connected in turn the solvent recovery tower stated by pipeline
Condenser, return tank and reflux pump, the reflux pump are adopted by the return line connection solvent recovery tower by product
Go out the piping connection external world, the bottom of the solvent recovery tower is stripped by piping connection solvent recovery bottom of tower pump and solvent respectively
Device, the solvent stripper is for the aromatic hydrocarbons contained in lean solvent to be stripped off.
2. a kind of solvent depth retracting device of Aromatics Extractive Project extraction rectification technique according to claim 1, feature exist
In the solvent stripper includes tank body, and steam pre-distributor, distribution of steam are from bottom to top disposed in the tank body
Device, contactor and solvent distributor, the tank base are provided with stripped vapor entrance and lean solvent outlet, the tank body
Top is provided with containing aromatic hydrocarbon steam outlet and import containing aromatic solvent.
3. a kind of solvent depth retracting device of Aromatics Extractive Project extraction rectification technique according to claim 1, feature exist
In the lean solvent of the solvent recovery tower bottom flows into the solvent stripper after catch box is collected by gravity.
4. a kind of solvent depth retracting device of Aromatics Extractive Project extraction rectification technique according to claim 1, feature exist
In the solvent stripper is vacuum.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721924501.4U CN207862264U (en) | 2017-12-29 | 2017-12-29 | A kind of solvent depth retracting device of Aromatics Extractive Project extraction rectification technique |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721924501.4U CN207862264U (en) | 2017-12-29 | 2017-12-29 | A kind of solvent depth retracting device of Aromatics Extractive Project extraction rectification technique |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207862264U true CN207862264U (en) | 2018-09-14 |
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ID=63464372
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721924501.4U Active CN207862264U (en) | 2017-12-29 | 2017-12-29 | A kind of solvent depth retracting device of Aromatics Extractive Project extraction rectification technique |
Country Status (1)
| Country | Link |
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| CN (1) | CN207862264U (en) |
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2017
- 2017-12-29 CN CN201721924501.4U patent/CN207862264U/en active Active
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