Hydrocarbon recovery with pressure swing adsorption
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B01D-053/047
C07C-007/12
C07C-007/13
C08F-010/02
C07C-007/00
C07C-007/04
B01J-008/20
B01J-019/24
C08F-002/14
B01J-019/18
출원번호
US-0957412
(2015-12-02)
등록번호
US-9427694
(2016-08-30)
발명자
/ 주소
Ji, Lei
Chang, Ai-Fu
출원인 / 주소
Chevron Phillips Chemical Company LP
대리인 / 주소
Conley Rose, P.C.
인용정보
피인용 횟수 :
0인용 특허 :
33
초록▼
A process for component separation in a polymer production system comprising: (a) separating a polymerization product into a gas stream and a polymer stream; (b) processing the gas stream in distillation columns to yield a light hydrocarbon stream (LHS) comprising ethylene and ethane; (c) contacting
A process for component separation in a polymer production system comprising: (a) separating a polymerization product into a gas stream and a polymer stream; (b) processing the gas stream in distillation columns to yield a light hydrocarbon stream (LHS) comprising ethylene and ethane; (c) contacting LHS with a purged hydrocarbon adsorber to yield a loaded hydrocarbon adsorber and a non-adsorbed gas stream, wherein ethane is adsorbed by the purged hydrocarbon adsorber at a first pressure to yield adsorbed ethane, and wherein the non-adsorbed gas stream comprises recovered ethylene; (d) contacting the loaded hydrocarbon adsorber with a sweeping gas stream at a second pressure to yield an unloaded hydrocarbon adsorber and a recovered adsorbed gas stream comprising the sweeping gas stream and desorbed ethane; and (e) contacting the unloaded hydrocarbon adsorber with the sweeping gas stream at the first pressure to yield the purged hydrocarbon adsorber and a spent sweeping gas.
대표청구항▼
1. A polyethylene production system comprising: an ethylene polymerization reactor system, a separator, one or more distillation columns, and at least two pressure swing adsorption units operated in parallel;wherein the ethylene polymerization reactor system is configured to receive a reagents strea
1. A polyethylene production system comprising: an ethylene polymerization reactor system, a separator, one or more distillation columns, and at least two pressure swing adsorption units operated in parallel;wherein the ethylene polymerization reactor system is configured to receive a reagents stream and to produce a polymerization product stream;wherein the separator is configured to receive at least a portion of the polymerization product stream and to produce a polymer stream and a gas stream;wherein the one or more distillation columns are configured to receive at least a portion of the gas stream and to produce a light hydrocarbon stream, wherein the light hydrocarbon stream comprises a first hydrocarbon and a second hydrocarbon;wherein each of the at least two pressure swing adsorption units is configured to receive at least a portion of the light hydrocarbon stream and a sweeping gas stream, and to produce a non-adsorbed gas stream comprising the second hydrocarbon and a spent sweeping gas comprising the first hydrocarbon;wherein a hydrocarbon adsorber bed is disposed in each pressure swing adsorption unit, wherein the hydrocarbon adsorber bed comprises a hydrocarbon adsorber and wherein the hydrocarbon adsorber has an adsorption selectivity of the first hydrocarbon versus the second hydrocarbon as determined by volumetric adsorption at 298 K and at a first pressure of equal to or greater than about 2;wherein upon contact of the light hydrocarbon stream with the hydrocarbon adsorber at the first pressure the hydrocarbon adsorber adsorbs at least a portion of the first hydrocarbon of the light hydrocarbon stream to yield a loaded hydrocarbon adsorber comprising adsorbed first hydrocarbon, and the non-adsorbed gas stream comprising at least at least a portion of the second hydrocarbon of the light hydrocarbon stream;wherein the hydrocarbon adsorber regenerates at a second pressure to yield an unloaded hydrocarbon adsorber and a desorbed first hydrocarbon, wherein the desorbed first hydrocarbon comprises at least a portion of the adsorbed first hydrocarbon, and wherein the first pressure is greater than the second pressure by equal to or greater than about 400 kPa; andwherein the unloaded hydrocarbon adsorber is contacted with the sweeping gas stream to yield a purged hydrocarbon adsorber. 2. The polyethylene production system of claim 1, wherein the hydrocarbon adsorber bed of each of the at least two pressure swing adsorption units has a bed thickness of from about 0.1 ft to about 20 ft. 3. The polyethylene production system of claim 1, wherein each of the at least two pressure swing adsorption units has a cylindrical geometry. 4. The polyethylene production system of claim 1, wherein open flow channels are provided through the hydrocarbon adsorber bed of each of the at least two pressure swing adsorption units. 5. The polyethylene production system of claim 4, wherein the open flow channels comprise structurally added elements to the pressure swing adsorption unit, perforated tubes that enable gas flow, spacers, spaces between hydrocarbon adsorber particles, hydrocarbon adsorber pores, support pores, or combinations thereof. 6. The polyethylene production system of claim 5, wherein the spacers comprise dimples or corrugations within a support, wherein the dimples or corrugations have a predetermined size to provide a desired flow channel volume of the open flow channels; particles; glass microspheres; wires of suitable size; or combinations thereof. 7. The polyethylene production system of claim 1, wherein the hydrocarbon adsorber comprises a zeolitic imidazolate framework (ZIF). 8. The polyethylene production system of claim 7, wherein the zeolitic imidazolate framework is characterized by a pore window size of from about 0.2 nm to about 0.5 nm. 9. The polyethylene production system of claim 7, wherein the zeolitic imidazolate framework comprises ZIF-7, ZIF-8, ZIF-65, ZIF-67, or combinations thereof. 10. The polyethylene production system of claim 7, wherein the hydrocarbon adsorber further comprises a support, wherein the zeolitic imidazolate framework contacts at least a portion of the support, is distributed throughout the support, or combinations thereof. 11. The polyethylene production system of claim 10, wherein the support has a porosity of from about 0 vol. % to about 99 vol. % based on the total volume of the support. 12. The polyethylene production system of claim 10, wherein the support comprises a support outer surface, wherein at least a portion of the support outer surface is in contact with the zeolitic imidazolate framework. 13. The polyethylene production system of claim 1, wherein the first pressure is from about 600 kPa to about 3,000 kPa. 14. The polyethylene production system of claim 1, wherein the first hydrocarbon is a saturated hydrocarbon, and wherein the second hydrocarbon is an olefin. 15. The polyethylene production system of claim 1, wherein the pressure swing adsorption unit is characterized by a cycle time of from about 10 seconds to about 1 hour. 16. The polyethylene production system of claim 1, wherein from about 2 to about 8 pressure swing adsorption units are operated in parallel. 17. A polyethylene production system comprising: a slurry loop reactor system, a flash chamber, one or more distillation columns, and a first pressure swing adsorption unit and a second pressure swing adsorption unit operated in parallel;wherein the slurry loop reactor system is configured to receive a reagents stream and to produce a polymerization product stream;wherein the flash chamber is configured to receive at least a portion of the polymerization product stream and to produce a polymer stream and a gas stream;wherein the one or more distillation columns are configured to receive at least a portion of the gas stream and to produce a light hydrocarbon stream, wherein the light hydrocarbon stream comprises a saturated hydrocarbon and an olefin;wherein each pressure swing adsorption unit is configured to receive at least a portion of the light hydrocarbon stream and a sweeping gas stream, and to produce a non-adsorbed gas stream comprising the olefin and a spent sweeping as comprising the saturated hydrocarbon;wherein a hydrocarbon adsorber bed is disposed in each pressure swing adsorption unit, wherein the hydrocarbon adsorber bed comprises a hydrocarbon adsorber and wherein the hydrocarbon adsorber has an adsorption selectivity of the saturated hydrocarbon versus the olefin as determined by volumetric adsorption at 298 K and at a first pressure of equal to or greater than about 2;wherein each of the first pressure swing adsorption unit and the second pressure swing adsorption unit independently and successively cycles through each of an adsorption step, a desorption step, and a purging step;wherein the hydrocarbon adsorber of each of the first pressure swing adsorption unit and the second pressure swing adsorption unit is independently contacted with the sweeping gas stream during the purging step to yield a purged hydrocarbon adsorber;wherein each of the first pressure swing adsorption unit and the second pressure swing adsorption unit independently adsorbs at the first pressure during the adsorption step, wherein the purged hydrocarbon adsorber adsorbs at least a portion of the saturated hydrocarbon of the light hydrocarbon stream to yield a loaded hydrocarbon adsorber comprising an adsorbed saturated hydrocarbon and a non-adsorbed gas stream comprising at least a portion of the olefin of the light hydrocarbon stream;wherein each of the first pressure swing adsorption unit and the second pressure swing adsorption unit independently regenerates at a second pressure during the desorption step, wherein the loaded hydrocarbon adsorber is regenerated to yield an unloaded hydrocarbon adsorber and a desorbed saturated hydrocarbon, wherein the desorbed saturated hydrocarbon comprises at least a portion of the adsorbed saturated hydrocarbon;wherein the first pressure is greater than the second pressure by equal to or greater than about 400 kPa; andwherein the first pressure swing adsorption unit and the second pressure swing adsorption unit are offset operationally such that at any given time one of the units is ready to or undergoing the adsorption step, thereby providing for a continuous process. 18. The polyethylene production system of claim 17, wherein while the first pressure swing adsorption unit undergoes the adsorption step, the second pressure swing adsorption unit undergoes successively both the desorption step and the purging step. 19. The polyethylene production system of claim 18, wherein the hydrocarbon adsorber bed has a bed thickness of from about 0.1 ft to about 20 ft; wherein open flow channels are provided through the hydrocarbon adsorber bed; wherein the hydrocarbon adsorber comprises a zeolitic imidazolate framework (ZIF) characterized by a pore window size of from about 0.2 nm to about 0.5 nm; and wherein the zeolitic imidazolate framework comprises ZIF-7, ZIF-8, ZIF-65, ZIF-67, or combinations thereof. 20. A polyethylene production system comprising: a slurry loop reactor system, a flash chamber, one or more distillation columns, and a first pressure swing adsorption unit, a second pressure swing adsorption unit, and a third pressure swing adsorption unit operated in parallel;wherein the slurry loop reactor system is configured to receive a reagents stream and to produce a polymerization product stream;wherein the flash chamber is configured to receive at least a portion of the polymerization product stream and to produce a polymer stream and a gas stream;wherein the one or more distillation columns are configured to receive at least a portion of the gas stream and to produce a light hydrocarbon stream, wherein the light hydrocarbon stream comprises a saturated hydrocarbon and an olefin;wherein each pressure swing adsorption unit is configured to receive at least a portion of the light hydrocarbon stream and a sweeping gas stream, and to produce a non-adsorbed gas stream comprising the olefin and a spent sweeping gas comprising the saturated hydrocarbon;wherein a hydrocarbon adsorber bed is disposed in each pressure swing adsorption unit, wherein the hydrocarbon adsorber bed comprises a hydrocarbon adsorber and wherein the hydrocarbon adsorber has an adsorption selectivity of the saturated hydrocarbon versus the olefin as determined by volumetric adsorption at 298 K and at a first pressure of equal to or greater than about 2;wherein each of the first pressure swing adsorption unit, the second pressure swing adsorption unit, and the third pressure swing adsorption unit independently and successively cycles through each of an adsorption step, a desorption step, and a purging step;wherein the hydrocarbon adsorber of each of the first pressure swing adsorption unit, the second pressure swing adsorption unit, and the third pressure swing adsorption unit is independently contacted with a sweeping gas stream during the purging step to yield a purged hydrocarbon adsorber;wherein each of the first pressure swing adsorption unit, the second pressure swing adsorption unit, and the third pressure swing adsorption unit independently adsorbs at a first pressure during the adsorption step, wherein the purged hydrocarbon adsorber adsorbs at least a portion of the saturated hydrocarbon of the light hydrocarbon stream to yield a loaded hydrocarbon adsorber comprising an adsorbed saturated hydrocarbon and a non-adsorbed gas stream comprising at least a portion of the olefin of the light hydrocarbon stream;wherein each of the first pressure swing adsorption unit, the second pressure swing adsorption unit, and the third pressure swing adsorption unit independently regenerates at a second pressure during the desorption step, wherein the loaded hydrocarbon adsorber is regenerated to yield an unloaded hydrocarbon adsorber, and a desorbed saturated hydrocarbon, wherein the desorbed saturated hydrocarbon comprises at least a portion of the adsorbed saturated hydrocarbon;wherein the first pressure is greater than the second pressure by equal to or greater than about 400 kPa; andwherein the first pressure swing adsorption unit, the second pressure swing adsorption unit, and the third pressure swing adsorption unit are offset operationally such that at any given time one of the units is ready to or undergoing the adsorption step, thereby providing for a continuous process. 21. The polyethylene production system of claim 20, wherein while the first pressure swing adsorption unit undergoes the adsorption step, the second pressure swing adsorption unit undergoes the desorption step and the third pressure swing adsorption unit undergoes the purging step. 22. The polyethylene production system of claim 20, wherein the hydrocarbon adsorber bed of each of the first pressure swing adsorption unit, the second pressure swing adsorption unit, and the third pressure swing adsorption unit has a bed thickness of from about 0.1 ft to about 20 ft; wherein open flow channels are provided through the hydrocarbon adsorber bed of each of the first pressure swing adsorption unit, the second pressure swing adsorption unit, and the third pressure swing adsorption unit; wherein the hydrocarbon adsorber comprises a zeolitic imidazolate framework (ZIF) characterized by a pore window size of from about 0.2 nm to about 0.5 nm; and wherein the zeolitic imidazolate framework comprises ZIF-7, ZIF-8, ZIF-65, ZIF-67, or combinations thereof.
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