CN203960086U - A kind of device that can adjust flexibly ethylene yield - Google Patents
A kind of device that can adjust flexibly ethylene yield Download PDFInfo
- Publication number
- CN203960086U CN203960086U CN201420062184.XU CN201420062184U CN203960086U CN 203960086 U CN203960086 U CN 203960086U CN 201420062184 U CN201420062184 U CN 201420062184U CN 203960086 U CN203960086 U CN 203960086U
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- CN
- China
- Prior art keywords
- ethylene
- pipeline
- ethene
- rectification tower
- tower
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 title claims abstract description 118
- 239000005977 Ethylene Substances 0.000 title claims abstract description 87
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 claims abstract description 19
- 238000010992 reflux Methods 0.000 claims abstract description 15
- 125000004122 cyclic group Chemical group 0.000 claims abstract description 13
- 239000007788 liquid Substances 0.000 claims description 10
- 230000001105 regulatory effect Effects 0.000 claims description 7
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 abstract description 13
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 abstract description 13
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 abstract description 12
- 238000004821 distillation Methods 0.000 abstract description 10
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000000605 extraction Methods 0.000 description 11
- 238000000034 method Methods 0.000 description 11
- 239000004743 Polypropylene Substances 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 5
- -1 polypropylene Polymers 0.000 description 5
- 229920001155 polypropylene Polymers 0.000 description 5
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 3
- 235000011941 Tilia x europaea Nutrition 0.000 description 3
- 239000004571 lime Substances 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 238000009835 boiling Methods 0.000 description 1
- 230000004087 circulation Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The utility model relates to a kind of petrochemical unit, a kind of device that can adjust flexibly ethylene yield, it is characterized in that, ethene, ethane inlet duct are provided with FC1 regulation system, ethene, ethane inlet duct are connected with ethylene rectification tower 1 at middle part, ethylene rectification tower 1 bottom is provided with pipeline and is connected with tower bottom reboiler 5, the top of ethylene rectification tower 1 is provided with pipeline and is connected with condenser 2, condenser 2 bottoms are provided with pipeline and are connected with return tank 3, return tank 3 is provided with pipeline and is connected with reflux pump 4, reflux pump 4 is provided with pipeline and is connected with ethylene rectification tower 1, and its pipeline is provided with FC2 regulation system.The advantage of this device is, for process for preparing propylene from methanol, demand according to downstream unit to ethene, by cyclic part ethylene product, make it be further converted to propylene by reactive system, and then realize accurate adjustment ethylene yield, reduce the dependence to ethene storage facility, and ethylene distillation system operation load can remain unchanged, ensure system stable operation.
Description
Technical field
The utility model relates to a kind of petrochemical unit.
Background technology
In methanol-to-olefins field, there are at present two main technique routes, one is to produce ethene and propylene product simultaneously, two kinds of product productions are roughly suitable, are conventionally called methanol-to-olefins (MTO) technique; Another kind is to take as the leading factor with production propylene product, does not produce or only produce the ethylene product compared with small proportion, is conventionally called preparing propylene from methanol (MTP) technique.
For preparing propylene from methanol (MTP) technique, if the supporting polypropylene plant in downstream, because the different polypropylene trades mark requires to add the ethene of different ratios as comonomer, therefore require upstream MTP technique, according to polypropylene plant, the conditions of demand of ethene are produced to ethylene product.As everyone knows, because ethene boiling point is extremely low, and have the characteristics such as inflammable, explosive, condition of storage harshness and storage cost costliness are difficult to transportation and sale in addition, and this just requires the ethylene product output of MTP output and polypropylene plant demand to match.And being polypropylene plants, practical situation be there is to variation by a relatively large margin in the demand of ethene, this turndown ratio relatively little with ethylene distillation system contradicts, therefore be necessary for a kind of new technique of MTP device development, the supporting device that can adjust flexibly ethylene yield, can stablize ethylene distillation operation, guarantee ethylene product quality, can adjust flexibly again ethylene yield, reduce the investment of ethene storage facility, avoid the waste of ethene resource simultaneously.
Summary of the invention
The purpose of this utility model is to overcome the deficiency of prior art, and a kind of device that can adjust flexibly ethylene yield is provided.
On the basis of existing MTP technique lighter hydrocarbons circulations (C2～C6 hydro carbons circulating reaction), newly-increased a set of ethylene recycle facility, ethylene recycle except being used as product after separating is returned to anterior reactive system, be translated into propylene by methanation reaction.
From traditional loading or the product of output cushioned, allocate different by storing and transporting system by adjustment System, this technique is by cyclic part ethylene product, it is further converted to propylene by reactive system, and then realize accurate adjustment ethylene yield, the demand of flexible adaptation downstream unit to ethene, reduce the dependence to ethene storage facility, and ethylene distillation system operation load can remain unchanged, ensure system stable operation.
Ethene, ethane parallel feeding enter ethylene rectification tower by certain flow, steam ethene from tower top, this ethene steam is divided into two portions, and a part enters condenser, after the whole condensations of cryogen, entered return tank, return tank liquid level is regulated by the cryogen amount that enters condenser.Lime set in return tank is extracted out and pressurizes through reflux pump, and part conduct refluxes, and through quantitatively regulating and return to ethylene distillation column overhead, a part is quantitative extraction ethylene product as required.From the rest part ethylene vapor of ethylene distillation column overhead, regulate control tower top pressure through pressure, then return to anterior MTP reactor as cyclic ethylene after subsequent recovery cold, be converted into propylene through reaction process.
Ethylene rectification tower heats through tower bottom reboiler, obtains ethane product from tower bottom, the liquid level at the bottom of variable valve carrys out control tower, extraction ethane product.
A kind of device that can adjust flexibly ethylene yield, it is characterized in that, ethene, ethane inlet duct is provided with FC1 regulation system, ethene, ethane inlet duct is connected with ethylene rectification tower at middle part, ethylene rectification tower bottom is provided with pipeline and is connected with tower bottom reboiler, the top of ethylene rectification tower is provided with pipeline and is connected with condenser, condenser is provided with pipeline and is connected with return tank, return tank is provided with pipeline and is connected with reflux pump, reflux pump is provided with pipeline and is connected with ethylene rectification tower, its pipeline is provided with FC2 regulation system, reflux pump is provided with pipeline and is connected with ethylene product outlet, its pipeline is provided with FC3 regulation system,
Ethylene rectification tower bottom is provided with liquid level LC2 regulation system, and its variable valve is located on ethylene product outlet conduit; Return tank is provided with liquid level LC1 regulation system, and its variable valve is located on condenser cryogen inlet duct;
Ethylene distillation column overhead is provided with PC1 pressure regulating system, and its pressure regulator valve is located on ethylene distillation top of tower cyclic ethylene outlet conduit.
This device can maintain under the certain condition of ethylene rectification tower feed rate, trim the top of column amount, by by overhead extraction gas phase cyclic ethylene, realizes ethylene yield and adjusts flexibly in 0～100% load range of designed capacity; Meanwhile, due to continuous extraction ethane product, avoided the ethane composition of inertia to accumulate in system; By extraction gas phase cyclic ethylene, reduce the load of ethylene rectification tower overhead condenser.Therefore, this technique not only can guarantee that system operation is stable, and energy consumption is lower.
This device can be adjusted the device of ethylene yield flexibly.For process for preparing propylene from methanol, demand according to downstream unit to ethene, by cyclic part ethylene product, make it be further converted to propylene by reactive system, and then realizing accurate adjustment ethylene yield, the demand of flexible adaptation downstream unit to ethene, reduces the dependence to ethene storage facility, and ethylene distillation system operation load can remain unchanged, ensure system stable operation.
Brief description of the drawings
Fig. 1 is a kind of structural representation that can adjust flexibly the device of ethylene yield.
In figure, there are ethylene rectification tower 1, condenser 2, return tank 3, reflux pump 4, reboiler 5.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is made and being described in further detail.
As shown in the figure, be provided with FC1 regulation system, ethene, ethane mixed gas enter ethylene rectification tower 1 from middle part, the tower top of ethylene rectification tower 1 steams ethene, this ethene steam is divided into two portions, and a part enters condenser 2, after the whole condensations of cryogen, is entered return tank 3, regulate return tank 3 liquid levels by the cryogen amount that enters condenser 2, be provided with LC1 regulation system; Lime set in return tank 3 is extracted out and pressurizes through reflux pump 4, a part is as refluxing, through quantitatively returning to ethylene rectification tower 1 tower top, be provided with FC2 regulation system, another part, quantitative extraction ethylene product as required, be provided with quantitative FC3 regulation system, from the rest part ethylene vapor of ethylene rectification tower 1 tower top, be provided with PC1 pressure regulating system, control tower top pressure, another part ethylene vapor is cyclic ethylene, through subsequent technique, after recovery cold, return to anterior MTP reactor as cyclic ethylene, then be converted into propylene through reaction process again;
Ethylene rectification tower 1 heats through tower bottom reboiler 5, obtains ethane product from tower bottom, is provided with LC2 regulation system, then liquid level at the bottom of variable valve carrys out control tower, sends ethane product.
Implementation process, containing ethene, the ethane parallel feeding of ethene 30～95% (v), enter ethylene rectification tower 1 by certain flow, tower 1 is for having the plate distillation column of more than 50 theoretical stage, tower top working pressure is 1.5～2.3MPaG, service temperature-25～-38 DEG C, rectifying institute energy requirement is supplied with by tower bottom reboiler 5.Tower top obtains the gaseous ethene of purity >=99.5% (v), this ethene is divided into two portions, a part enters condenser 2, enter return tank 3 after being condensed into liquid ethylene by cryogen condenser 2 is interior, the liquid level of return tank 3 is regulated by the cryogen amount that enters condenser 2, to guarantee the stable of trim the top of column amount.Lime set in return tank 3 is extracted out and pressurizes through reflux pump 4, a part is as refluxing through quantitatively regulating and return to ethylene rectification tower 1 tower top, a part is quantitative extraction ethylene product as required, and ethylene product flow range can regulate arbitrarily in 0～100% scope of designed capacity.Rest part gaseous ethylene from ethylene rectification tower 1 tower top regulates control tower top pressure through pressure, then returns to anterior MTP reactor as cyclic ethylene after subsequent recovery cold, is converted into propylene through reaction process.
Ethylene rectification tower 1 tower reactor temperature-5～-20 DEG C, obtain 92～98% (v) ethane from tower bottom, after liquid level at the bottom of variable valve control tower as ethane product extraction.
The present embodiment can maintain under the certain condition of ethylene rectification tower 1 feed rate, trim the top of column amount, by by overhead extraction gas phase cyclic ethylene, realizes ethylene yield and adjusts flexibly in 0～100% load range of designed capacity; Meanwhile, due to continuous extraction ethane product, avoided the ethane composition of inertia to accumulate in system; By extraction gas phase cyclic ethylene, reduce the load of ethylene rectification tower 1 overhead condenser 2.Therefore, the present embodiment not only can guarantee that system operation is stable, and energy consumption is lower.
Claims (1)
1. can adjust flexibly the device of ethylene yield for one kind, it is characterized in that, ethene, ethane inlet duct is provided with FC1 regulation system, ethene, ethane inlet duct is connected with ethylene rectification tower (1) at middle part, ethylene rectification tower (1) bottom is provided with pipeline and is connected with tower bottom reboiler (5), the top of ethylene rectification tower (1) is provided with pipeline and is connected with condenser (2), condenser (2) bottom is provided with pipeline and is connected with return tank (3), return tank (3) is provided with pipeline and is connected with reflux pump (4), reflux pump (4) is provided with pipeline and is connected with ethylene rectification tower (1), its pipeline is provided with FC2 regulation system, reflux pump (4) is provided with pipeline and is connected with ethylene product outlet, its pipeline is provided with FC3 regulation system,
Ethylene rectification tower (1) bottom is provided with liquid level LC2 regulation system, and its variable valve is located on ethylene product outlet conduit;
Return tank (3) is provided with liquid level LC1 regulation system, and its variable valve is located on condenser (2) cryogen inlet duct;
Ethylene rectification tower (1) tower top is provided with PC1 pressure regulating system, and its pressure regulator valve is located on the cyclic ethylene outlet conduit of ethylene rectification tower (1) top.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420062184.XU CN203960086U (en) | 2014-01-29 | 2014-01-29 | A kind of device that can adjust flexibly ethylene yield |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420062184.XU CN203960086U (en) | 2014-01-29 | 2014-01-29 | A kind of device that can adjust flexibly ethylene yield |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203960086U true CN203960086U (en) | 2014-11-26 |
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ID=51920695
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420062184.XU Expired - Lifetime CN203960086U (en) | 2014-01-29 | 2014-01-29 | A kind of device that can adjust flexibly ethylene yield |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203960086U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104844407A (en) * | 2015-04-30 | 2015-08-19 | 中国石油集团东北炼化工程有限公司吉林设计院 | System for adjusting ethylene output |
-
2014
- 2014-01-29 CN CN201420062184.XU patent/CN203960086U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104844407A (en) * | 2015-04-30 | 2015-08-19 | 中国石油集团东北炼化工程有限公司吉林设计院 | System for adjusting ethylene output |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20200925 Address after: 132002 3-6 and 9-13 floors of Block A, Jihua Economic and Trade Center, Tongtan Road, Changyi District, Jilin Province Patentee after: PetroChina Jilin Chemical Engineering Co.,Ltd. Address before: 132001 Jilin District of Changyi province Tong Tan Road Jihua Trade Center building A Patentee before: JILIN DESIGNING INSTITUTE OF CNPC NORTHEAST REFINING & CHEMICAL ENGINEERING Co.,Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20141126 |