CN207632728U - Olefin separation system - Google Patents
Olefin separation system Download PDFInfo
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- CN207632728U CN207632728U CN201721729856.8U CN201721729856U CN207632728U CN 207632728 U CN207632728 U CN 207632728U CN 201721729856 U CN201721729856 U CN 201721729856U CN 207632728 U CN207632728 U CN 207632728U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P30/00—Technologies relating to oil refining and petrochemical industry
- Y02P30/40—Ethylene production
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Abstract
The utility model provides a kind of olefin separation system.The olefin separation system includes the product gas separative element of methanol-to-olefins, product gas separative element includes propylene rectification tower and domethanizing column, and propylene rectification tower is connected to domethanizing column by delivery of propane pipeline with domethanizing column and provides propane, olefin separation system further includes liquefied gas separative element, liquefied gas separative element be used for by liquefied gas butane and propane detach, there are liquefied gas separative element propane outlets, propane outlets to be connected with the tower reactor of propylene rectification tower.Itself and propylene are subjected to infinite reflux using the isolated delivery of propane of liquefied gas separative element to propylene rectification tower, make its operating conditions closer to normal production status, greatly shorten propylene rectification tower adjustment time when going into operation, therefore the absorption of propylene when enough propane goes into operation for domethanizing column can be isolated in time from propylene rectification tower, so that propylene rectification tower and domethanizing column smoothly go into operation, the material waste that goes into operation is reduced.
Description
Technical field
The utility model is related to separation of olefins technical fields, in particular to a kind of olefin separation system.
Background technology
In recent years, the increase with world market to polyethylene, polypropylene demand, various regions great amount of investment build petroleum cracking
And coal to olefin project.Wherein coal-to-olefin includes four coal gasification, purified synthesis gas, methanol-fueled CLC and methanol-to-olefins cores
Technology.Methanol-to-olefins complete set technology is made of reaction technology and isolation technics.Reaction technology is with the development and reaction of catalyst
Device exploitation is designed as core, using methanol as olefin production mixture；Isolation technics is then using reaction product as raw material, through impurity
The processes such as removing, compression, separation production polymer grade ethylene and propylene product, core are the exploitations of impurity removal and separation process
And design.
For the above-mentioned project completed and gone into operation, such as separation of ethylene, propylene of light component hydrocarbon and the carbon four of having created using dress
That sets goes into operation, and part flow may require that hydrogenation unit, with remove the alkene in reaction feed or product, alkadienes, alkynes,
The impurity such as aldehyde, oxidation of ketones object reach the cleaning for ensureing follow-up system raw material, special reaction requirement or improve the mesh such as product quality
's.It causes to waste and pass through so that shortening its life cycle because these impurity often cause catalyst poisoning or adsorbent to be poisoned
Ji loss.Therefore, when being driven for the first time using device to the separation of ethylene, propylene and carbon four, to whole device inside system
The cleanliness factor of system has higher requirement, the Safety oil of high-purity just to play a good role at this moment.But actual conditions are
The Safety oil butane buying that there is a problem of going into operation is difficult, and goes into operation the stage for the first time, there is also domethanizing column propane wash it is solvent-free or
The amount of person's solvent be not achieved design value cause ethylene product loss, yield reduce and propylene distillation system go into operation adjustment the period length etc.
Difficult point.
There are following points for the existing start-up method of current separator：
(1) four hydrogenation system of the carbon heat of adsorption that butadiene hydrogenation exothermic heat of reaction and elimination catalyst are fed for the first time in order to control,
The saturated carbon four of 90% or more butane content is needed to be used as driving Safety oil.Currently, market meets the high-purity of Safety oil specification demands
It spends butane price height and buying is difficult；
(2) domethanizing column propane solvent come from propylene distillation system, when domethanizing column goes into operation, rear system propylene rectification tower without
Bromopropane product produces；
(3) existing start-up method, propylene rectification tower is interior only with propylene infinite reflux, and propylene rectification tower is fed when actually going into operation
For the mixture of propane and propylene, and the separating difficulty of propane and propylene is larger, propylene rectification tower tune steady period when causing to go into operation
Long, unqualified propylene product is more.
It can be seen that in order to realize smoothly going into operation for propylene separation device, there is an urgent need for be improved to existing separator.
Utility model content
The main purpose of the utility model is to provide a kind of olefin separation systems, to solve propylene in the prior art point
Problem from device on-stream time length.
To achieve the goals above, one side according to the present utility model provides a kind of olefin separation system, including
The product gas separative element of methanol-to-olefins, product gas separative element include propylene rectification tower and domethanizing column, and propylene rectifying
Tower is connected to domethanizing column by delivery of propane pipeline with domethanizing column and provides propane, and olefin separation system further includes liquefaction qi leel
From unit, liquefied gas separative element be used for by liquefied gas butane and propane detach, liquefied gas separative element goes out with propane
Mouthful, propane outlets are connected with the tower reactor of propylene rectification tower.
Further, above-mentioned liquefied gas separative element is depropenizer.
Further, the tower top of above-mentioned depropenizer is exported with propane outlets, bottom of tower with butane.
Further, the said goods gas separative element further includes hydrogenation unit, and hydrogenation unit has safe oil-in, butane
Outlet is connected with safe oil-in.
Further, above-mentioned depropenizer further includes return tank, and return tank has impurities outlet.
Further, the said goods gas separative element further includes：Depropanizing tower has C3-Group sub-export and C4+Group separates
Mouthful, C3-Group sub-export is connected with the gas entrance to be separated of domethanizing column；Debutanizing tower has C4 group sub-exports, C4+Group sub-export
It is connected with the gas entrance to be separated of debutanizing tower, C4 groups sub-export waits for that hydrogenation gas entrance is connected with hydrogenation unit.
Further, also there is above-mentioned domethanizing column methane outlet and mixed light-hydrocarbon to export, and product gas separative element also wraps
It includes：Dethanizer, mixed light-hydrocarbon outlet are connected with the gas entrance to be separated of dethanizer, and dethanizer also has crude propylene outlet
It is exported with crude ethylene, crude propylene outlet is connected with the gas entrance to be separated of propylene rectification tower.
Further, the said goods gas separative element further includes ethylene rectifying column, the gas entrance to be separated of ethylene rectifying column
It is connected with crude ethylene outlet.
Further, above-mentioned hydrogenation unit is exported with hydrogenated products gas, and product gas separative element further includes：Disproportionated reaction
Unit, the outlet of hydrogenated products gas are connected with the reactant entrance of disproportionated reaction unit, and disproportionated reaction unit also has disproportionated reaction
Product exit；De- ethylene column, disproportionated reaction product exit are connected with the gas entrance to be separated of de- ethylene column.
Further, the said goods gas separative element further includes depropenizer, the gas entrance to be separated of depropenizer with it is de-
The bottom of tower outlet of ethylene column can be opened and closed to connect.
Using the technical solution of the utility model, by the way that product gas separative element and liquefied gas separative element are tied
It closes, using the isolated delivery of propane of liquefied gas separative element to propylene rectification tower by itself and propylene progress infinite reflux, makes it
Operating conditions greatly shorten propylene rectification tower adjustment time when going into operation closer to normal production status, thus can make propylene compared with
Quick separating, and the suction of propylene when enough propane goes into operation for domethanizing column can be isolated in time from propylene rectification tower
It receives so that propylene rectification tower and domethanizing column smoothly go into operation, and solve the problems, such as that domethanizing column goes into operation solvent-free propane, reduction goes into operation
Material waste shortens the on-stream time of olefin separation system so that product gas separative element can smoothly go into operation.
Description of the drawings
The accompanying drawings which form a part of this application are used to provide a further understanding of the present invention, this practicality
Novel illustrative embodiments and their description are not constituted improper limits to the present invention for explaining the utility model.
In the accompanying drawings：
Fig. 1 shows the structure diagram for the olefin separation system that a kind of embodiment according to the present utility model provides.
Wherein, above-mentioned attached drawing includes the following drawings label：
11, depropanizing tower；12, domethanizing column；13, dethanizer；14, propylene rectification tower；15, ethylene rectifying column；16, it takes off
Butane tower；17, hydrogenation unit；18, disproportionated reaction unit；19, ethylene column is taken off；21, depropenizer.
Specific implementation mode
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase
Mutually combination.The utility model will be described in detail below with reference to the accompanying drawings and embodiments.
As the application background technology is analyzed, existing start-up method, only with propylene infinite reflux in propylene rectification tower 14,
The charging of propylene rectification tower 14 is the mixture of propane and propylene when actually going into operation, and the separating difficulty of propane and propylene is larger, leads
Propylene rectification tower 14 adjusts the steady period long when cause goes into operation, and unqualified propylene product is more, and in order to solve this problem, this application provides one
Kind olefin separation system, as shown in Figure 1, the olefin separation system includes the product gas separative element of methanol-to-olefins, the product
Gas separative element includes propylene rectification tower 14 and domethanizing column 12, and propylene rectification tower 14 passes through delivery of propane with domethanizing column 12
Pipeline is connected to domethanizing column 12 and provides propane, which further includes liquefied gas separative element, and liquefied gas separation is single
Member for by liquefied gas butane and propane detach, liquefied gas separative element has propane outlets, propane outlets and propylene essence
The tower reactor for evaporating tower 14 is connected.
By the way that product gas separative element and liquefied gas separative element to be combined, detached using liquefied gas separative element
The delivery of propane arrived, by itself and propylene progress infinite reflux, makes its operating conditions closer to normal production work to propylene rectification tower 14
Condition greatly shortens propylene rectification tower adjustment time when going into operation, therefore propylene can be made faster to detach, and can be from propylene rectifying
The absorption of propylene when enough propane goes into operation for domethanizing column 12 is isolated in tower 14 in time so that propylene rectification tower 14 and de-
Methane tower 12 smoothly goes into operation, and solves the problems, such as that domethanizing column 12 goes into operation solvent-free propane, and reduction goes into operation material waste, so that
Product gas separative element can smoothly go into operation, and shorten the on-stream time of olefin separation system.
Well known to those skilled in the art, liquefied gas is after deep hydrogenation is to control in component containing unsaturated hydrocarbons content
Product is mainly organized as propane, butane and a small amount of ethane and pentane.It therefore, can using existing apparatus depropenizer 21
The lock out operation of liquefied gas when completing to go into operation, preferably above-mentioned liquefied gas separative element are depropenizer 21.It can certainly use
Depropanizing tower detaches liquefied gas as liquefied gas separative element.Through operation adjustment, bottom of tower is separable to obtain satisfaction plus hydrogen
The butane of 17 Safety oil specification requirement of unit；It is propane in 21 tower top of depropenizer, Propylene Spherical Tanks is led to simultaneously by propylene extraction line
Propylene rectification tower 14 is introduced as needed.
Utilization rate in order to further increase liquefied gas reduces the operating cost of olefin separation system, preferably above-mentioned de- propylene
The tower top of tower 21 is exported with propane outlets, bottom of tower with butane.The butane collected by the butane outlet of bottom of tower can be sold in addition, into
And recycle liquefied gas cost.
It is preferred that as shown in Figure 1, the said goods gas separative element further includes hydrogenation unit 17, hydrogenation unit 17 has Safety oil
Entrance, butane outlet are connected with safe oil-in.The butane that liquefied gas is separated is passed through into the peace that goes into operation using depropenizer 21
Full oil line is delivered to hydrogenation unit 17, and the Safety oil as hydrogenation unit 17 uses, and solves hydrogenation unit 17 in the prior art
Problem of high cost caused by outsourcing butane, buying is difficult.And since after the separation of depropenizer 21, the purity of butane reaches
90% or more, the requirement of Safety oil can be met completely, hydrogenation unit Safety oil enters plus hydrogen each unit carries out catalysts
Infiltration, shortens the driving time longer problem brought of system after being infiltrated due to preceding system hydrogenation reaction product system, and can be with
Dilution hydrogenation reaction go into operation charging mixing carbon four in butadiene content, control exothermic heat of reaction rate, and eliminate catalyst for the first time into
The heat of adsorption of material to not only complete going into operation for hydrogenation unit 17 using low cost, but also maintains the entire startup procedure of system
Stablize.As previously mentioned, in addition to containing propane and butane in liquefied gas, also contain a small amount of ethane and pentane, in order to improve propane
With the separative efficiency of butane, preferably above-mentioned depropenizer 21 further includes return tank, and return tank has impurities outlet, ethane and pentane
Etc. components fixed gas pipeline arranged by return tank set fire torch.
In a kind of embodiment of the application, as shown in Figure 1, the said goods gas separative element further includes depropanizing tower 11 and takes off
Butane tower 16, depropanizing tower 11 have C3-Group sub-export and C4+Group sub-export, C3-Group sub-export and domethanizing column 12 wait for point
It is connected from gas entrance；Debutanizing tower 16 has C4 group sub-exports, C4+The gas entrance to be separated of group sub-export and debutanizing tower 16
It is connected, C4 groups sub-export waits for that hydrogenation gas entrance is connected with hydrogenation unit 17.
Above-mentioned C3-C3 in group sub-export-Component includes C1, C2 and C3 component；C4+C4 in group sub-export+Group subpackage
Include C4 and carbon atom number be more than 4 component.Product gas is handled by above-mentioned depropanizing tower 11 and debutanizing tower 16,
In favor of improving the separative efficiency of follow-up domethanizing column 12 and the hydrogenation efficiency of hydrogenation unit 17.
In the application another kind embodiment, above-mentioned domethanizing column 12 also has methane outlet and the outlet of mixing light olefin,
As shown in Figure 1, the said goods gas separative element further includes dethanizer 13, the outlet of mixing light olefin and dethanizer 13 wait for point
It is connected from gas entrance, dethanizer 13 also has crude propylene outlet and crude ethylene outlet, crude propylene outlet and propylene rectification tower 14
Gas entrance to be separated be connected.It is obtained with propylene and ethylene after removing methane and ethane by domethanizing column 12 and dethanizer 13
Based on separation gas；Then rectifying is carried out to crude propylene using propylene rectification tower 14, obtains propylene product.
In order to further increase product gas olefin product yield, as shown in Figure 1, it is preferred that the said goods gas separative element
Further include ethylene rectifying column 15, the gas entrance to be separated of ethylene rectifying column 15 is connected with crude ethylene outlet.Utilize ethylene rectifying column
15 pairs of crude ethylenes carry out rectifying, obtain ethylene product.
In the application another preferred embodiment, as shown in Figure 1, there is above-mentioned hydrogenation unit 17 hydrogenated products gas to go out
Mouthful, the said goods gas separative element further includes disproportionated reaction unit 18 and de- ethylene column 19, and the outlet of hydrogenated products gas and disproportionation are anti-
The reactant entrance of unit 18 is answered to be connected, disproportionated reaction unit 18 also has disproportionated reaction product exit；Disproportionated reaction product goes out
Mouth is connected with the gas entrance to be separated of de- ethylene column 19.The hydrogenated products gas generated to hydrogenation unit 17 is further disproportionated
Reaction increases productivity of propylene；Then, de- ethylene is carried out to disproportionated reaction product using de- ethylene column 19, disproportionation is further purified
Reaction product.
Preferably, as shown in Figure 1, the said goods gas separative element further includes depropenizer 21 above-mentioned, depropenizer 21
The bottom of tower outlet of gas entrance to be separated and de- ethylene column 19 can be opened and closed to connect.By the de- propylene as liquefied gas separative element
Depropenizer 21 of the tower 21 as product gas separative element, divides liquefied gas using the depropenizer 21 in the stage of going into operation
From after completing to go into operation, the depropenizer 21 input product gas separative element carries out de- propylene, has saved equipment investment, simplification
The structure of olefin separation system.
It is illustrated below with reference to embodiment and with reference to figure 1 to a kind of olefin separation system of embodiment of the application.
Outsourcing liquefied gas is the product after deep hydrogenation, mainly organize as propane, butane and a small amount of ethane and
Pentane.Composition such as the following table 1：
Table 1
Outsourcing liquefied gas is unloaded through Truck Loading Point to Propylene Spherical Tanks, is sent to de- third by the propylene line that goes into operation after tank field is pressurizeed
Alkene tower.The tower reactor that comes into operation boils steam again, adjusts tower operating pressure and regurgitant volume, and control return tank arranges regulating valve on fixed gas line, will
The light components such as ethane arrange torch.After butane content is met the requirements in kettle liquid, sent outside to four spherical tank of carbon, top pronane through four line of carbon
Propane outlets through depropenizer tower top are sent by propylene product line to another Propylene Spherical Tanks, wherein tower top, tower reactor composition are shown in Table
2。
2 depropenizer tower top of table, tower reactor composition (mass fraction %)
It can be obtained according to table 2, liquefied gas is after depropenizer detaches, butane a concentration of 97.5% in tower reactor kettle liquid, meets and adds hydrogen
The specification requirement of system Safety oil.The butane outlet of tower reactor kettle liquid butane headframe bottom is sent using Safety oil line to hydrogenation unit, to urging
Agent bed is impregnated, and the butane for absorbing heat of adsorption is pumped by cyclic carbon four, after releasing heat into cooling unit, is returned
Catalyst bed continues to take away heat of adsorption.Catalyst bed starts hydrogenation reactor and comes into operation operation without apparent Wen Shenghou, cycle
Butane is mixed with the fresh mix carbon four of introducing at hydrogenation unit charging, dilution charging in butadiene concentration, by control into
Butadiene concentration in material, hydrogenation reactor rate of heat release when control goes into operation.
The propane that propylene rectification tower is introduced by the propylene line that goes into operation in Propylene Spherical Tanks will be in Propylene Spherical Tanks by process settings
Propane import propylene rectification tower, throwing boils steam, establishes infinite reflux again, keeps tower reactor propane liquid level, waits for the charging of rectifying object；
Domethanizing column go into operation charging when, the propane for producing propylene rectification tower is sent to demethanizer column overhead, and the methane gas of propane and rising exists
Counter current contacting in tower removes the ethylene gas of entrainment.
To sum up, the present invention proposes to replace the buying of Safety oil with liquefied gas, and liquefied gas is separated into propane in depropenizer
And butane.Butane solves the problems, such as that high-purity butane Safety oil is not easy to purchase as hydrogenation unit Safety oil；Propane and propylene
The infinite reflux in propylene rectification tower is established, only establishes system infinite reflux with propylene compared to original method, gas in tower when new method goes into operation
Liquid distribution can shorten system and go into operation the adjustment period, reduce unqualified propylene product closer to normal production status.Meanwhile propylene
He is that going into operation for domethanizing column provides propane solvent for rectifying, will substantially reduce former start-up method and goes into operation caused by no propane solvent
The loss of period product has considerable economic benefit.
It can be seen from the above description that the above embodiments of the present invention achieve the following technical effects：
By the way that product gas separative element and liquefied gas separative element to be combined, detached using liquefied gas separative element
Itself and propylene are carried out infinite reflux by the delivery of propane arrived to propylene rectification tower, make its operating conditions closer to normal production status,
Propylene rectification tower adjustment time when going into operation is greatly shortened, therefore propylene can be made faster to detach, and can be from propylene rectification tower
In isolate the absorption of propylene when enough propane goes into operation for domethanizing column in time so that propylene rectification tower and domethanizing column are suitable
Profit goes into operation, and solves the problems, such as that domethanizing column goes into operation solvent-free propane, and reduction goes into operation material waste, so that product gas separation is single
Member can smoothly go into operation, and shorten the on-stream time of olefin separation system.The above is only the preferred embodiment of the present invention
, it is not intended to limit the utility model, for those skilled in the art, the utility model can have various changes
And variation.Within the spirit and principle of the utility model, any modification, equivalent replacement, improvement and so on should all include
It is within the protection scope of the utility model.
Claims (10)
1. a kind of olefin separation system, includes the product gas separative element of methanol-to-olefins, the product gas separative element includes
Propylene rectification tower (14) and domethanizing column (12), and the propylene rectification tower (14) and the domethanizing column (12) are defeated by propane
It send pipeline to be connected to the domethanizing column (12) and propane is provided, which is characterized in that
The olefin separation system further includes liquefied gas separative element, and the liquefied gas separative element is used for the fourth in liquefied gas
Alkane and propane separation, the liquefied gas separative element have propane outlets, the propane outlets and the propylene rectification tower (14)
Tower reactor be connected.
2. olefin separation system according to claim 1, which is characterized in that the liquefied gas separative element is depropenizer
(21)。
3. olefin separation system according to claim 2, which is characterized in that the tower top of the depropenizer (21) has institute
State propane outlets, bottom of tower is exported with butane.
4. olefin separation system according to claim 3, which is characterized in that the product gas separative element further includes adding hydrogen
There is safe oil-in, the butane outlet to be connected with the safe oil-in for unit (17), the hydrogenation unit (17).
5. olefin separation system according to claim 2, which is characterized in that the depropenizer (21) further includes reflux
Tank, the return tank have impurities outlet.
6. olefin separation system according to claim 4, which is characterized in that the product gas separative element further includes：
Depropanizing tower (11) has C3-Group sub-export and C4+Group sub-export, the C3-Group sub-export and the domethanizing column
(12) gas entrance to be separated is connected；
Debutanizing tower (16) has C4 group sub-exports, the C4+Group sub-export and the gas to be separated of the debutanizing tower (16) enter
Mouth is connected, and the C4 groups sub-export waits for that hydrogenation gas entrance is connected with the hydrogenation unit (17).
7. olefin separation system according to claim 6, which is characterized in that the domethanizing column (12) also goes out with methane
Mouth and mixed light-hydrocarbon outlet, the product gas separative element further include：
Dethanizer (13), the mixed light-hydrocarbon outlet is connected with the gas entrance to be separated of the dethanizer (13), described de-
Also there is ethane tower (13) crude propylene outlet and crude ethylene outlet, the crude propylene outlet to be waited for the propylene rectification tower (14)
Gas entrance is detached to be connected.
8. olefin separation system according to claim 7, which is characterized in that the product gas separative element further includes ethylene
The gas entrance to be separated of rectifying column (15), the ethylene rectifying column (15) is connected with crude ethylene outlet.
9. olefin separation system according to claim 4, which is characterized in that the hydrogenation unit (17) has hydrogenated products
Gas exports, and the product gas separative element further includes：
Disproportionated reaction unit (18), the reactant entrance phase of hydrogenated products the gas outlet and the disproportionated reaction unit (18)
Even, the disproportionated reaction unit (18) also has disproportionated reaction product exit；
De- ethylene column (19), the disproportionated reaction product exit are connected with the gas entrance to be separated of the de- ethylene column (19).
10. olefin separation system according to claim 9, which is characterized in that the product gas separative element further includes institute
Depropenizer (21) is stated, the gas entrance to be separated of the depropenizer (21) and the bottom of tower outlet of the de- ethylene column (19) can open
Close ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721729856.8U CN207632728U (en) | 2017-12-12 | 2017-12-12 | Olefin separation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721729856.8U CN207632728U (en) | 2017-12-12 | 2017-12-12 | Olefin separation system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207632728U true CN207632728U (en) | 2018-07-20 |
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ID=62862538
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| Country | Link |
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| CN (1) | CN207632728U (en) |
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