CN208525868U - A kind of next door tower aromatic hydrocarbons extraction rectifier unit - Google Patents
A kind of next door tower aromatic hydrocarbons extraction rectifier unit Download PDFInfo
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- CN208525868U CN208525868U CN201820597333.0U CN201820597333U CN208525868U CN 208525868 U CN208525868 U CN 208525868U CN 201820597333 U CN201820597333 U CN 201820597333U CN 208525868 U CN208525868 U CN 208525868U
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Abstract
The utility model relates to a kind of aromatic hydrocarbons device for making, in particular to a kind of next door tower aromatic hydrocarbons extraction rectifier unit.Its structure includes extractive distillation column, the extractive distillation column connects feeding pipe by feed preheater, extractive distillation column top connects aromatic hydrocarbons condenser, for generating aromatic hydrocarbons, the extractive distillation column lower part connection extracting rectifying tower reboiler and extractive distillation column heat exchanger, the extractive distillation column heat exchanger also passes through piping connection feed preheater, the pipeline of the feed preheater is also connected with solvent cooler, the solvent cooler passes through piping connection extractive distillation column, the extracting rectifying tower bottom is sequentially connected solvent regenerator by pipeline, condenser for solvent and solvent collector.A kind of next door tower aromatic hydrocarbons extraction rectifier unit of the utility model, next door tower technology is applied in aromatic hydrocarbons extraction rectifier unit by it, Aromatics Extractive Project/extractive distillation column and solvent recovery tower are integrated into Yi Taita, it can reduce the energy consumption of device, reduce the ability of the complexity of solvent loadings and device, the final economy for improving device and long time stability operation.
Description
Technical field
The utility model relates to a kind of aromatic hydrocarbons device for making, in particular to a kind of next door tower aromatic hydrocarbons extraction rectifier unit.
Background technique
Aromatic hydrocarbons is one of most important industrial chemicals of modern industry, and the main source that aromatic hydrocarbons is obtained on modern industry is petroleum
Or class petroleum distillate.Due to numerous containing component in raw material petroleum distillate, many components are close with aromatic hydrocarbons boiling point, and there are also many
Component, such as hexamethylene form azeotropic with aromatic hydrocarbons, can not be separated aromatic hydrocarbons from petroleum distillate using conventional distillation method.
Therefore most common Aromatics Production Technology is Aromatics Extractive Project/extraction and distillation technology on modern industry, is to improve virtue using solvent
The relative volatility of hydrocarbon and non-aromatics or difference according to aromatic hydrocarbons and non-aromatics solubility in a solvent, by aromatic hydrocarbons and non-aromatics
It is kept completely separate and comes.Resulting BTX aromatics pass through conventional distillation again and further separate, so obtain purified petroleum benzin (B), toluene (T) and
The products such as dimethylbenzene (X), this is modern most important a kind of bulk chemical.Virtue is obtained currently with aromatic hydrocarbons extraction distillation technology
The primary raw material of hydrocarbon includes naphtha (PYGAS), the coal tar that catalytic reforming generates oily (CRO), steam cracking lighter hydrocarbons by-product
Crude benzol (COLO), cat cracked naphtha etc..
Modern Aromatics Extractive Project/extracting rectifying device mainly includes Aromatics Extractive Project/extractive distillation column and solvent recovery tower two
Point.The features such as these Aromatics Extractive Project/extraction rectification techniques are low, aromatic hydrocarbon product is high-quality, low energy consumption, high income due to its investment,
Extensive industrial application is obtained.In extracting/extracting rectifying part, the aromatic hydrocarbons in charging is absorbed into solvent, non-aromatics from
Overhead extraction；In Solvent recovery portion, aromatic hydrocarbons rises to overhead extraction, and lean solvent is recycled in tower reactor；Then poor molten
Agent can be recycled to extracting/extracting rectifying part, absorb aromatic hydrocarbons again, to recycle.Few partial solvent need into
Row regeneration, to guarantee the superperformance of whole solvent.
But this Aromatics Extractive Project/extraction and distillation technology the shortcomings that also having its:
1, energy consumption is high
Aromatics Extractive Project/extractive distillation column operates under normal pressure, and the rich solvent of tower reactor is made of aromatic hydrocarbons and solvent, in order to anti-
Only non-aromatics enters tower reactor, is heated to suitable high-temperature, is then pumped into solvent recovery tower.Solvent recovery tower is in negative pressure
Lower operation, when rich solvent enters solvent recovery tower, temperature is more than bubble point temperature, its thermodynamic efficiency in this way is lower, and energy consumption is also
It is relatively high.
2, device is more complex
Modern Aromatics Extractive Project/extracting rectifying device mainly includes Aromatics Extractive Project/extractive distillation column and solvent recovery tower two
King-tower, this two towers require that the auxiliary devices such as reboiler, tower reactor pump, condenser, return tank, reflux pump are respectively configured.Equipment
It is more, it operates also more complex.
3, just loading amount is high for solvent
Solvent is equipped in Aromatics Extractive Project/extractive distillation column and solvent recovery tower, the pipeline of connection is also filled with solvent, molten
Agent loadings are more.Higher solvent loadings mean that the amount of degrading solvent in future can be relatively more, and the consumption of solvent also can
Compare more.
For these problems, " application of aromatic hydrocarbon extraction solvent regeneration new process in actual production " (" oil Refining Technologies and work
Journey ", 2004,34 (7): 23-25) literary grace with filtering technique remove macromolecule polyalcohol, guarantee solvent cleaning, efficiently.So
And since these polymer are molecule ranks, mechanical filtering method is difficult to remove, and practical application effect is also just not satisfactory.Lee race
Light (a kind of regeneration method of aromatic hydrocarbon extraction solvent of CN1062007C) proposes the method for solvent reclamation.Zhou Shiwei
(CN201520824691.7, a kind of extraction solvent recycling and reusing system) also attempts to use the means such as interpolation type reboiler to pumping
Extraction solvent recycling and reusing system improves.However these methods can not carry out revolutionary improvement, institute to current device
Can not promote.
Summary of the invention
In order to solve problems in the prior art, the utility model provides a kind of next door tower aromatic hydrocarbons extraction rectifier unit,
Next door tower technology is applied in aromatic hydrocarbons extraction rectifier unit, Aromatics Extractive Project/extractive distillation column and solvent recovery tower are integrated into
One tower, can reduce the energy consumption of device, reduce the complexity of solvent loadings and device, the final economy for improving device with
And the ability of long time stability operation.
Technical solution used by the utility model is as follows:
A kind of next door tower aromatic hydrocarbons extraction rectifier unit, including extractive distillation column, the extractive distillation column are pre- by charging
Hot device connects feeding pipe, and extractive distillation column top connects aromatic hydrocarbons condenser, for generating aromatic hydrocarbons, under the extractive distillation column
Portion's connection extracting rectifying tower reboiler and extractive distillation column heat exchanger, the extractive distillation column heat exchanger also pass through piping connection
Feed preheater, the pipeline of the feed preheater are also connected with solvent cooler, and the solvent cooler is connected by pipeline
Extractive distillation column is connect, the extracting rectifying tower bottom is sequentially connected solvent regenerator, condenser for solvent and solvent by pipeline
Collector.
Raffinate oil condenser is connected on extractive distillation column, for raffinating oil.
Extracting rectifying tower bottom passes through extractive distillation column heat exchanger described in piping connection.
The aromatic hydrocarbons condenser extractive distillation column also described by recovery pipe connection.
Technical solution provided by the utility model has the benefit that
The utility model applies to next door tower technology in aromatic extraction unit, physically by Aromatics Extractive Project/extracting rectifying
Tower and solvent recovery tower are entirely integrated into an extractive distillation column.Specific practice is one piece of partition of setting in tower, is solvent
Two functions of extracting rectifying and solvent recovery are confined to different regions, and the function of extracting rectifying had both may be implemented in such tower
Can, it can also realize the function of solvent recovery.The top of tower produces raffinate oil product and aromatic hydrocarbon product respectively；Tower bottom extraction is poor molten
Agent.Lean solvent is by the heat of heat exchange recycling for several times, using the top for entering tower after the cooling temperature for adjusting lean solvent, again into
The operation of row extracting rectifying.
The lean solvent come from extracting rectifying tower bottom is by heat exchange sufficiently recycling heat, then through supercooling, into extraction essence
Evaporate the middle and upper part of tower.Charging enters from the middle part of extractive distillation column.One piece of partition is set in extractive distillation column, a part of tower into
The extracting rectifying expected of advancing operates, and a part carries out solvent recovery operation.The top of tower produces raffinate oil product and aromatic hydrocarbons respectively
Product；Tower bottom produces lean solvent.Lean solvent is laggard using the cooling temperature for adjusting lean solvent by the heat of heat exchange recycling for several times
Enter the top of tower, carries out extracting rectifying operation again.
After this technology, concentration back-mixing is not present in this component of aromatic hydrocarbons in tower, therefore is built using this technology
The energy consumption of aromatics producing unit can be lower by 25% or so than normal aromatic hydrocarbon extracting/extracting rectifying device.
Change the relative volatility of aromatic hydrocarbons and non-aromatics since next door extractive distillation column needs solvent, so this technology must
Solvent must be used as working medium.Solvent can be the chemistry such as sulfolane, N-methylmorpholine, benzothiophene, methyl sulfolane
Product, it is also possible to the compound prescription solution of two kinds of even more multi-chemicals.
Since next door extractive distillation column needs solvent as working medium, and solvent cannot operate at relatively high temperatures,
So this tower must operate under negative pressure.In general the operating pressure of tower is between -0.8barg to -0.2barg.
Since solvent can go bad in long-term circulate operation, degrade, system is caused to generate acidic materials, thus need plus
Enter weak base, such as MEA to neutralize acidic materials.
Since solvent is easy foaming in lighter hydrocarbons, lead to the inefficiency of tower, so need that defoaming agent is added, it is such as siliceous or
Person reduces foaming tendency without silicon defoaming agent etc..
This next door extractive distillation column operates under negative pressure, and operation temperature is generally between 45C~250C.In general,
Tower top is minimum, tower reactor highest.
This next door extractive distillation column both using plate column or can use packed tower in tower internals, can also use tower
The combination tower that disk and filler are all made of.
Detailed description of the invention
It, below will be to required in embodiment description 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 system flow chart of next door tower aromatic hydrocarbons extraction rectifier unit of the utility model.
Specific embodiment
It is practical new to this 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 Fig. 1, a kind of next door tower aromatic hydrocarbons extraction rectifier unit, including extractive distillation column 1, the extracting rectifying
Tower 1 connects feeding pipe by feed preheater 6, and 1 top of extractive distillation column connects aromatic hydrocarbons condenser 2, for generating aromatic hydrocarbons, institute
1 lower part of the extractive distillation column connection extracting rectifying tower reboiler 4 and extractive distillation column heat exchanger 5 stated, the extractive distillation column
For heat exchanger 5 also by piping connection feed preheater 6, the pipeline of the feed preheater 6 is also connected with solvent cooler 7, institute
By piping connection extractive distillation column 1,1 bottom of extractive distillation column is sequentially connected the solvent cooler 7 stated by pipeline
Solvent regenerator 8, condenser for solvent 9 and solvent collector 10.
Raffinate oil condenser 3 is connected on extractive distillation column 1, for raffinating oil.
1 bottom of extractive distillation column passes through extractive distillation column heat exchanger 5 described in piping connection.
The extractive distillation column 1 also described by recovery pipe connection of aromatic hydrocarbons condenser 2.
The above is only the preferred embodiment of the present invention, is not intended to limit the utility model, all practical at this
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 next door tower aromatic hydrocarbons extraction rectifier unit, including extractive distillation column, the extractive distillation column pass through feeding preheating
Device connects feeding pipe, which is characterized in that the extractive distillation column top connects aromatic hydrocarbons condenser, for generating aromatic hydrocarbons, institute
The extractive distillation column lower part connection extracting rectifying tower reboiler and extractive distillation column heat exchanger stated, the extractive distillation column heat exchange
Device also passes through piping connection feed preheater, and the pipeline of the feed preheater is also connected with solvent cooler, the solvent
Cooler by piping connection extractive distillation column, the extracting rectifying tower bottom by pipeline be sequentially connected solvent regenerator,
Condenser for solvent and solvent collector.
2. a kind of next door tower aromatic hydrocarbons extraction rectifier unit according to claim 1, which is characterized in that the extracting rectifying
Raffinate oil condenser is connected on tower, for raffinating oil.
3. a kind of next door tower aromatic hydrocarbons extraction rectifier unit according to claim 1, which is characterized in that the extracting rectifying
Tower bottom passes through extractive distillation column heat exchanger described in piping connection.
4. a kind of next door tower aromatic hydrocarbons extraction rectifier unit according to claim 1, which is characterized in that the aromatic hydrocarbons condensation
The device extractive distillation column also described by recovery pipe connection.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110393940A (en) * | 2018-04-25 | 2019-11-01 | 杨祖杰 | A kind of next door tower aromatic hydrocarbons extraction rectifier unit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110393940A (en) * | 2018-04-25 | 2019-11-01 | 杨祖杰 | A kind of next door tower aromatic hydrocarbons extraction rectifier unit |
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