Cryogenic system for removing acid gases from a hydrocarbon gas stream
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F25J-003/08
F25J-003/06
B01D-007/02
C10L-003/10
F25J-003/02
출원번호
US-0828951
(2015-08-18)
등록번호
US-10222121
(2019-03-05)
발명자
/ 주소
Cullinane, John Tim
Northrop, Paul Scott
출원인 / 주소
ExxonMobil Upstream Research Company
대리인 / 주소
ExxonMobil Upstream Research Company Law Department
인용정보
피인용 횟수 :
0인용 특허 :
118
초록▼
A system for removing acid gases from a raw gas stream is provided. The system includes a cryogenic distillation tower. The cryogenic distillation tower has a controlled freezing zone that receives a cold liquid spray comprised primarily of methane. The tower receives and then separates the raw gas
A system for removing acid gases from a raw gas stream is provided. The system includes a cryogenic distillation tower. The cryogenic distillation tower has a controlled freezing zone that receives a cold liquid spray comprised primarily of methane. The tower receives and then separates the raw gas stream into an overhead methane gas stream and a substantially solid material comprised on carbon dioxide. The system includes a collector tray below the controlled freezing zone. The collector tray receives the substantially solid material as it is precipitated in the controlled freezing zone. The system also has a filter. The filter receives the substantially solid material and then separates it into a solid material comprised primarily of carbon dioxide, and a liquid material comprising methane. The solid material may be warmed as a liquid and sold, while the liquid material is returned to the cryogenic distillation tower.
대표청구항▼
1. A method for removing acid gases from a dehydrated raw gas stream, comprising: providing a cryogenic distillation tower, the tower having a controlled freezing zone that receives a cold liquid spray comprised primarily of methane, and a collector tray below the controlled freezing zone;injecting
1. A method for removing acid gases from a dehydrated raw gas stream, comprising: providing a cryogenic distillation tower, the tower having a controlled freezing zone that receives a cold liquid spray comprised primarily of methane, and a collector tray below the controlled freezing zone;injecting the raw gas stream into the cryogenic distillation tower;chilling the raw gas stream so as to cause carbon dioxide within the raw gas stream to precipitate upon the collector tray as a slurry, while allowing methane to vaporize and exit the cryogenic distillation tower as an overhead methane stream;passing the overhead methane stream through a refrigeration system downstream of the cryogenic distillation tower, the refrigeration system cooling the overhead methane stream;returning a portion of the cooled overhead methane stream to the cryogenic distillation tower as liquid reflux to serve as the cold liquid spray;removing the slurry from the cryogenic distillation tower;separating the slurry into a solid material comprised primarily of carbon dioxide, and a liquid material comprising methane, said separating step comprising passing the slurry through a first filter, thereby producing a first filter cake comprising the solid material, and a first filtrate comprising the liquid material, and wherein the first filtrate further comprises methane and carbon dioxide, in liquid phase;warming solid material taken primarily from the first filter cake to produce a carbon dioxide stream, in liquid phase, wherein the liquid carbon dioxide stream comprises a portion of the carbon dioxide stream; andreturning at least a portion of the liquid material to the cryogenic distillation tower. 2. The method of claim 1, wherein: the collector tray comprises a downcomer into which the precipitated slurry falls; andthe collector tray directs the slurry out of the cryogenic distillation tower (i) by gravitational flow, (ii) by operation of a mechanical translation device, (iii) by aid of spraying a portion of the cold liquid spray into the collector tray and against the slurry, or (iv) by combinations thereof. 3. The method of claim 1, wherein: the cryogenic distillation tower further comprises an upper rectification zone above the controlled freezing zone, and a lower distillation zone below the controlled freezing zone; andthe raw gas stream is injected into the lower distillation zone;and further comprising releasing a bottoms stream from the lower distillation zone, the bottoms stream comprising acid gases in liquid phase; andwherein returning at least a portion of the liquid material to the cryogenic distillation tower comprises delivering the liquid material to the lower distillation zone. 4. The method of claim 1, wherein said separating step further comprises: rinsing the first filter cake using a liquid carbon dioxide stream;mixing the first filter cake with the liquid carbon dioxide stream to produce a first solid-liquid slurry; anddelivering the first solid-liquid slurry to a second filter, thereby producing a second filter cake comprised primarily of solid carbon dioxide, and a second filtrate comprising methane, in liquid phase. 5. The method of claim 4, further comprising combining the first filtrate and the second filtrate; andwherein the liquid material that is returned to the lower distillation zone comprises the combined first filtrate and second filtrate. 6. The method of claim 5, further comprising: rinsing the second filter cake using the liquid carbon dioxide stream;mixing the second filter cake to produce a solid-liquid slurry; anddelivering the solid-liquid slurry to a third filter, thereby producing a third filter cake comprised primarily of solid carbon dioxide, and a third filtrate comprising methane, in liquid phase. 7. The method of claim 1, wherein the warming comprises passing slurry taken from the first filter cake through a heat exchanger such that heat is exchanged with the raw gas stream. 8. The method of claim 1, wherein the first filter comprises a porous medium or a centrifuge. 9. The method of claim 1, wherein the step of returning at least a portion of the liquid material to the cryogenic distillation tower comprises injecting the first filtrate directly back into the controlled freezing zone. 10. The method of claim 6, further comprising: combining the second filtrate and the third filtrate;injecting the second filtrate and the third filtrate into a distillation separator, thereby producing a bottoms liquid stream comprised primarily of carbon dioxide, in liquid phase, and a recovery methane stream; andcombining the overhead methane stream from the cryogenic distillation tower with the recovery methane stream. 11. The method of claim 2, wherein the collector tray is inclined towards the downcomer to direct the slurry into the downcomer.
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