CN101028987A - Method and apparatus for extracting, rectifying and separating propane and propylene by separated wall tower - Google Patents
Method and apparatus for extracting, rectifying and separating propane and propylene by separated wall tower Download PDFInfo
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- CN101028987A CN101028987A CN 200610161598 CN200610161598A CN101028987A CN 101028987 A CN101028987 A CN 101028987A CN 200610161598 CN200610161598 CN 200610161598 CN 200610161598 A CN200610161598 A CN 200610161598A CN 101028987 A CN101028987 A CN 101028987A
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Abstract
An apparatus for separating propane from propene by extracting-rectifying in a divided wall column (DWC) in which the water contained acetonitrile is used as the extractant is disclosed. Said DWC has a vertical bulkhead to divide it into three regions: the region A for extracting rectifying of propene and propane, the region B for separating propane from propene, and the region C as common desorption region. Its separation method is also disclosed.
Description
Technical field
The present invention relates to a kind of chemical separating, extraction equipment, refer in particular to the method and the device thereof of a kind of dividing wall column extracting rectifying separating propane and propylene, it can realize that the extracting rectifying of propylene and propane and being recovered in the dividing wall column of solvent finish simultaneously.
Background technology
When separating propane, propylene mixtures, the difference according to working pressure is divided into low-pressure distillation, high-pressure rectification and three kinds of methods of low pressure heat pump distillation usually.
High-pressure process is because tower top temperature is higher than 40 ℃, and available water quench produces and refluxes, and the tower still can heat with low-pressure steam or hot water, and equipment is simple.But because the relative volatility between two components is less, the tower height of design reaches 90 meters, and stage number is more than 200, and reflux ratio is greater than 10, pressure height, big energy-consuming.
Adopt low-pressure process, propylene, propane relative volatility height, thus reduce stage number and reflux ratio, but cat head need adopt the cryogen condensation lower than coolant water temperature, big energy-consuming.
Low pressure heat pump method often adopts heat pump, and promptly the low temperature hydrocarbon vapour that steams with cat head is sent to tower still heat and changed as the refrigeration cycle cryogen after compressed pressurize and the temperature, emits heat and condenses into liquid, part discharging, partial reflux, this flow process complexity.
Present domestic most employing high-pressure process.Do not see the novel process report of useful dividing wall column extracting rectifying separation of propylene and propane at home and abroad so far.
Use the dividing wall column extracting rectifying to separate thick 1,3-butadiene among the USPA2003018772.Three steps have been comprised in this process: extracting rectifying; Selective hydrogenation; The purification of thick 1,3-butadiene.The structure of the dividing wall column in this patent is different with dividing wall column structure of the present invention, among the present invention partition wall is extended to the cat head of dividing wall column.
Use the dividing wall column extracting rectifying to separate thick 1,3-butadiene among the USPA20040065538.Comprise two towers in this technical process: dividing wall column and extraction-scrub column.Partition wall in the dividing wall column extends to cat head and is in the position of departing from the tower center.Have only a dividing wall column among the present invention, partition wall extends to cat head and is in the central position of tower.
Use the dividing wall column extracting rectifying to contain the mixture of two or more component among the USPA20050199482.Use one extraction agent or two strands of different extraction agents in this method.When using one extraction agent, do not recycle at the residual solvent of tower still place's extraction.Adopt one extraction agent among the present invention, and the solvent cycle of tower still extraction is used.
CN03817644 has introduced the method for using dividing wall column continuous fractionation C 4 fraction.The present invention adopts dividing wall column continuous fractionation C3, both separation system differences.
CN200510041506 has introduced a kind of extraction rectifying method and device that the partition wall rectifying tower is arranged.In this device, cat head is only established a condenser, and a condenser is established in two zones that separate in cat head punishment next door among the present invention respectively.
The gas fractionation process that CN98110924 has introduced the energy-conservation high yield of a kind of province's tower is used for separating of propylene and propane, and this technology does not adopt dividing wall column.
Summary of the invention
The objective of the invention is to propose the novel process with dividing wall column extracting rectifying separation of propylene and propane: the extracting rectifying of propylene and propane and the recovery of solvent can be finished in dividing wall column simultaneously, the present invention compares with existing four-column process flow technology, under identical operations condition and separation requirement, simplified flow process, can improve relative volatility to contain water-acetonitrile as the extraction agent extracting rectifying, finish identical separation task and only need less reflux ratio and less number of theoretical plate.The dividing wall column good separating effect, solvent loss is little, and product yield improves 2.7% than existing technology, and energy efficient reaches 32.5%, saves 50% tower, 60% heat interchanging area and 32.2% number of theoretical plate.
The used extracting rectifying device of the present invention is a dividing wall column, be DWC (Dividing wall column), be to establish a vertical wall at the tower middle part, tower is divided into three zones, mainly carry out the extracting rectifying of propylene and propane in the zone one, mainly carry out separating of propylene and acetonitrile in the zone two, zone three is the public profit reduction and reserving district in zone one and zone two: zone one and zone three are referred to as the DWC king-tower, raw material is from the middle part charging in zone one, extraction agent is near the charging cat head in zone one, the propane that is insoluble in extraction agent is from a regional cat head extraction, and separating of propylene and extraction agent mainly finished in zone two, is soluble in the cat head extraction of the propylene of extraction agent from zone two.
The used extraction agent of the present invention is for containing water-acetonitrile, and water content is 5～40% (Wt%), uses this extraction agent can improve the relative volatility of propylene, can also reduce solvent boiling point simultaneously.
Dividing wall column extracting rectifying separation of propylene and propane flow process have obvious superiority:
(1) product yield height
When separation of propylene and propane miscellany, (C3H6 purity 99.3%, mol% under identical separation requirement; Down together), the isolated propylene product yield of dividing wall column is 95.7%, and the isolated propylene product yield of four-column process flow is 93%, shows the identical separation task of finishing, and the yield of dividing wall column flow process product is than four-column process flow height.
(2) solvent loss is little
During separation of propylene/propane miscellany, under identical separation requirement, the extent of damage of dividing wall column flow process solvent is 0.12%, the extent of damage of four-column process flow solvent is 0.28%, show the identical separation task of finishing, the loss of dividing wall column flow process solvent is little, and the utilization ratio of solvent is than four-column process flow height.
(3) less energy-consumption
Dividing wall column is the system architecture of thermodynamics coideal, when separating multicomponent mixture, with identical number of theoretical plate, finish identical separation task, dividing wall column is than four-column process flow need boiling hot again amount and condensation number still less, reboiler and condenser heat load have saved 46.5% and 0.012% respectively, and total thermal load has saved 32.5%.Show that for some given material, partition wall is compared with the conventional rectification tower with rectifying tower and needed less thermal load, so operation capacity is big, energy-conservation reaching more than 30%.
When separation of propylene and propane miscellany, under identical separation requirement, the dividing wall column flow process has been saved three towers and three interchanger than four-column process flow, and number of theoretical plate has also reduced 32.2%.
(4) save working cost
When separation of propylene and propane miscellany, under identical separation requirement, DWC flow process steam unit consumption saves 29% than four-column process flow, and refrigerant amount ratio four-column process flow saves 14%.Show that the DWC flow process is saved a large amount of working costs than four-column process flow.
(5) can separate polycomponent (three components or more than three components) mixture
When separation of propylene and propane miscellany, (C3H6 purity 99.3%, mol% under identical separation requirement; Down together), the isolated propylene product yield of dividing wall column is 95.7%, and the isolated propylene product yield of four-column process flow is 93%, shows the identical separation task of finishing, and the yield of dividing wall column flow process product is than four-column process flow height.The rectifying extraction section of dividing wall column is established a vertical wall, also can make three or four component mixtures be divided into purified product simultaneously, and energy-conservation prospect is bigger.
Description of drawings
Fig. 1 is a structural representation of the present invention:
1. 2 3. zones three, regional one 2. zones
Embodiment
As shown in Figure 1, the used extracting rectifying device of the present invention is that dividing wall column is that DWC (Dividing wall column) establishes a vertical wall at the tower middle part, and tower is divided into 3 zones.Mainly carry out the extracting rectifying of propylene and propane in the zone one, mainly carry out separating of propylene and acetonitrile in the zone two.Zone three is the public profit reduction and reserving district in zone one and zone two.Zone one and zone three are referred to as the DWC king-tower.Raw material is from the middle part charging in zone one, and extraction agent is near the charging cat head in zone one.Be insoluble in of the cat head extraction of the propane of extraction agent from zone one.Separating of propylene and extraction agent mainly finished in zone two.Be soluble in of the cat head extraction of the propylene of extraction agent from zone two.
The used extraction agent of the present invention is for containing water-acetonitrile, and water content is 5～40% (Wt%).Use this extraction agent can improve the relative volatility of propylene, can also reduce solvent boiling point simultaneously.
Embodiment 1: adopt four-column process flow extracting rectifying propylene and propane.Processing condition are: treatment capacity is 15000t/a, and containing propylene in the raw material is 70% (mol%), and working pressure is 1.72Mpa, and changing into molar flow rate is 48.905Kmol/hr.Extraction agent is for containing water-acetonitrile, and wherein water content is 40% (mol%).The processing parameter of each tower is as shown in table 1.Separating resulting is: the purity of propylene is 99.3% (mol%), and the rate of recovery is 93%.The four-column process flow flow process needs 90 theoretical stages altogether.Processing parameter is as shown in table 1.
Table 1 four-column process flow apparatus and process parameter table look-up
| Project | Extractive distillation column | Gas stripping column | Water wash column | Recovery tower |
| Tower top pressure (absolute pressure), MPa | 1.72 | 1.50 | 0.60 | 0.10 |
| Tower still pressure (absolute pressure), MPa | 1.77 | 1.55 | 0.605 | 0.105 |
| Tower top temperature, ℃ | 48.5 | 68.3 | 25.3 | -33.3 |
| Tower still temperature, ℃ | 110.4 | 168.6 | 48.6 | 99.6 |
| Stage number, piece reflux ratio R solvent ratio S1/F, mol/mol | 50 10 6 | 10 | 10 | 20 1.3 |
| Design spotting out percentage, % | 80 | 80 | 80 | 80 |
| Tower diameter, mm | 800 | 800 | 400 | 400 |
| The cat head thermal load, MMkcal/h | 0.413 | 0.145 | 0.134 | 0.026 |
| Tower still thermal load, MMkcal/h | 5.482 | 5.201 | 5.445 | 5.352 |
Comparative Examples 1: adopt dividing wall column extracting rectifying propylene and propane.Processing condition are: containing propylene in treatment capacity 15000t/a, the raw material is 70% (mol%), and working pressure is 1.72Mpa, and changing into molar flow rate is 48.905Kmol/hr.Extraction agent is for containing water-acetonitrile, and wherein water content is 40% (mol%).Separating resulting is: purified propylene is 99.3% (mol%), and the propylene rate of recovery is 95.7%.The DWC flow process needs 61 theoretical stages altogether.Process flow diagram as shown in Figure 2, processing parameter is as shown in table 2.
Table 2 DWC apparatus and process parameter table look-up
| Project | The DWC king-tower | Zone two |
| Tower top pressure (absolute pressure), MPa | 1.72 | 1.72 |
| Tower still pressure (absolute pressure), MPa | 1.82 | 1.82 |
| Tower top temperature, ℃ | 48.6 | 41.6 |
| Tower still temperature, ℃ | 181.9 | |
| Stage number, piece | 50 | 11 |
| Reflux ratio R | 10 | 3 |
| Solvent ratio S1/F, mol/mol | 7 | |
| Design spotting out percentage, % | 0.80 | |
| Tower diameter, mm | 800 | 600 |
| The cat head thermal load, MMkcal/h | 0.406 | 0.299 |
| Tower still thermal load, MMkcal/h | 5.250 |
Claims (2)
1. the method for dividing wall column extracting rectifying separating propane and propylene, it is that tower is divided into three zones, carries out the extracting rectifying of propylene and propane in the zone one, carries out separating of propylene and acetonitrile in the zone two, zone three be zone one and regional two a public stripping zone; Raw material is from the middle part charging in zone one, and extraction agent is near the charging cat head in zone one, and the propane that is insoluble in extraction agent is soluble in the cat head extraction of the propylene of extraction agent from zone two from a regional cat head extraction.
2. the device of the method for dividing wall column extracting rectifying separating propane according to claim 1 and propylene is characterized in that establishing a vertical wall at the tower middle part, forms three zones.
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| CN 200610161598 CN101028987A (en) | 2006-12-29 | 2006-12-29 | Method and apparatus for extracting, rectifying and separating propane and propylene by separated wall tower |
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| CN 200610161598 CN101028987A (en) | 2006-12-29 | 2006-12-29 | Method and apparatus for extracting, rectifying and separating propane and propylene by separated wall tower |
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| CN101774877A (en) * | 2010-01-22 | 2010-07-14 | 天津大学 | Operation method for full energy coupling separation system of C3, C4 and C5 in front-end depropanization ethylene process |
| CN102657949A (en) * | 2012-05-09 | 2012-09-12 | 河北工业大学 | Method for increasing thermodynamic efficiency of dividing wall column and dividing wall column |
| CN101798528B (en) * | 2010-01-22 | 2013-02-06 | 天津大学 | Partial energy coupled separation system of carbon 3, carbon 4 and carbon 5 used in predepropanization ethylene process and operation method |
| CN103012033A (en) * | 2011-09-22 | 2013-04-03 | 西安石油大学 | Method for separating propylene and propane from liquid hydrocarbon |
| CN104058920A (en) * | 2013-12-19 | 2014-09-24 | 武汉优立克新材料科技有限公司 | Separation method of propylene from propane by extractive rectification with alkane as extracting agent |
| CN104193575A (en) * | 2014-09-11 | 2014-12-10 | 中建安装工程有限公司 | Device and method for extracting, distilling and separating propane and propylene |
| CN104334243A (en) * | 2012-06-05 | 2015-02-04 | 阿克佐诺贝尔化学国际公司 | Dehydration of dilutions of compounds forming an azeotrope with water |
| CN104961651A (en) * | 2015-05-18 | 2015-10-07 | 中国石油大学(华东) | Method for separation of acetonitrile and water by use of extraction rectification dividing wall column |
| CN105749575A (en) * | 2014-12-17 | 2016-07-13 | 新特能源股份有限公司 | Divided wall distillation column for recovery of tail gas absorption liquid and condensate liquid in polysilicon production, method and processing system |
| CN108698956A (en) * | 2015-12-18 | 2018-10-23 | 沙特基础全球技术有限公司 | Produce the method and system of 1,3- butadiene |
| CN109096033A (en) * | 2018-07-17 | 2018-12-28 | 天津大学 | Remove the method and apparatus of oxygenatedchemicals in Fischer-Tropsch synthesis oil narrow fraction |
| CN110393940A (en) * | 2018-04-25 | 2019-11-01 | 杨祖杰 | A kind of next door tower aromatic hydrocarbons extraction rectifier unit |
| WO2020006226A1 (en) * | 2018-06-29 | 2020-01-02 | Uop Llc | Process for separation of propylene from a liquefied petroleum gas stream |
| WO2020006230A1 (en) * | 2018-06-29 | 2020-01-02 | Uop Llc | Process for separation of propylene from a liquefied petroleum gas stream |
| CN111995546A (en) * | 2020-09-07 | 2020-11-27 | 中国石油大学胜利学院 | Method for separating acetonitrile-water mixture by four-tower mode extractive distillation dividing wall tower |
| CN112174768A (en) * | 2020-09-24 | 2021-01-05 | 华南理工大学 | Method for separating cyclopentane and 2, 2-dimethylbutane by extractive distillation in dividing wall column |
| CN114479935A (en) * | 2020-10-23 | 2022-05-13 | 中国石油化工股份有限公司 | Hydrogenation device and hydrogenation method for mixed C4 stream |
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- 2006-12-29 CN CN 200610161598 patent/CN101028987A/en active Pending
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| CN101798528B (en) * | 2010-01-22 | 2013-02-06 | 天津大学 | Partial energy coupled separation system of carbon 3, carbon 4 and carbon 5 used in predepropanization ethylene process and operation method |
| CN101774877B (en) * | 2010-01-22 | 2013-04-10 | 天津大学 | Full energy coupling separation system of C3, C4 and C5 in front-end depropanization ethylene process and operation method |
| CN101774877A (en) * | 2010-01-22 | 2010-07-14 | 天津大学 | Operation method for full energy coupling separation system of C3, C4 and C5 in front-end depropanization ethylene process |
| CN103012033A (en) * | 2011-09-22 | 2013-04-03 | 西安石油大学 | Method for separating propylene and propane from liquid hydrocarbon |
| CN102657949A (en) * | 2012-05-09 | 2012-09-12 | 河北工业大学 | Method for increasing thermodynamic efficiency of dividing wall column and dividing wall column |
| CN102657949B (en) * | 2012-05-09 | 2013-03-06 | 河北工业大学 | Method for increasing thermodynamic efficiency of dividing wall column and dividing wall column |
| CN104334243A (en) * | 2012-06-05 | 2015-02-04 | 阿克佐诺贝尔化学国际公司 | Dehydration of dilutions of compounds forming an azeotrope with water |
| CN104334243B (en) * | 2012-06-05 | 2017-04-05 | 阿克佐诺贝尔化学国际公司 | The dehydration of the chemical compound diluted liquid of azeotropic mixture is formed with water |
| CN104058920A (en) * | 2013-12-19 | 2014-09-24 | 武汉优立克新材料科技有限公司 | Separation method of propylene from propane by extractive rectification with alkane as extracting agent |
| CN104058920B (en) * | 2013-12-19 | 2016-03-23 | 武汉优立克新材料科技有限公司 | A kind of take alkane as the method for extraction agent separation of extractive distillation propylene-propane |
| CN104193575A (en) * | 2014-09-11 | 2014-12-10 | 中建安装工程有限公司 | Device and method for extracting, distilling and separating propane and propylene |
| CN105749575A (en) * | 2014-12-17 | 2016-07-13 | 新特能源股份有限公司 | Divided wall distillation column for recovery of tail gas absorption liquid and condensate liquid in polysilicon production, method and processing system |
| CN105749575B (en) * | 2014-12-17 | 2017-12-19 | 新特能源股份有限公司 | The divided-wall distillation column of tail gas absorption liquid and condensate liquid recovery in production of polysilicon, method, processing system |
| CN104961651A (en) * | 2015-05-18 | 2015-10-07 | 中国石油大学(华东) | Method for separation of acetonitrile and water by use of extraction rectification dividing wall column |
| CN108698956A (en) * | 2015-12-18 | 2018-10-23 | 沙特基础全球技术有限公司 | Produce the method and system of 1,3- butadiene |
| CN108698956B (en) * | 2015-12-18 | 2021-07-27 | 沙特基础全球技术有限公司 | Method and system for producing 1, 3-butadiene |
| CN110393940A (en) * | 2018-04-25 | 2019-11-01 | 杨祖杰 | A kind of next door tower aromatic hydrocarbons extraction rectifier unit |
| WO2020006226A1 (en) * | 2018-06-29 | 2020-01-02 | Uop Llc | Process for separation of propylene from a liquefied petroleum gas stream |
| WO2020006230A1 (en) * | 2018-06-29 | 2020-01-02 | Uop Llc | Process for separation of propylene from a liquefied petroleum gas stream |
| CN112313195A (en) * | 2018-06-29 | 2021-02-02 | 环球油品有限责任公司 | Process for separating propylene from a liquefied petroleum gas stream |
| CN112313195B (en) * | 2018-06-29 | 2023-06-23 | 环球油品有限责任公司 | Process for separating propylene from a liquefied petroleum gas stream |
| CN109096033A (en) * | 2018-07-17 | 2018-12-28 | 天津大学 | Remove the method and apparatus of oxygenatedchemicals in Fischer-Tropsch synthesis oil narrow fraction |
| CN111995546A (en) * | 2020-09-07 | 2020-11-27 | 中国石油大学胜利学院 | Method for separating acetonitrile-water mixture by four-tower mode extractive distillation dividing wall tower |
| CN112174768A (en) * | 2020-09-24 | 2021-01-05 | 华南理工大学 | Method for separating cyclopentane and 2, 2-dimethylbutane by extractive distillation in dividing wall column |
| CN112174768B (en) * | 2020-09-24 | 2021-12-21 | 华南理工大学 | Method for separating cyclopentane and 2, 2-dimethylbutane by extractive distillation in dividing wall column |
| CN114479935A (en) * | 2020-10-23 | 2022-05-13 | 中国石油化工股份有限公司 | Hydrogenation device and hydrogenation method for mixed C4 stream |
| CN114479935B (en) * | 2020-10-23 | 2023-02-28 | 中国石油化工股份有限公司 | Hydrogenation device and hydrogenation method for mixed C4 material flow |
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