[특허]Recovery of methane from land fill gas

Recovery of methane from land fill gas 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	B01D-053/04
출원번호	US-0092746 (1987-09-03)
발명자 / 주소	Sircar Shivaji (Wescosville PA) Kumar Ravi (Allentown PA) Koch William R. (Fleetwood PA) VanSloun John (Allentown PA)
출원인 / 주소	Air Products and Chemicals, Inc. (Allentown PA 02)
인용정보	피인용 횟수 : 79 인용 특허 : 0

초록 ▼

High purity methane and carbon dioxide are recovered from landfill gas in an integrated multi-column adsorption system having a temperature swing adsorption section (TSA) for pretreatment of the crude landfill gas to remove trace impurities therefrom, the thus cleaned gas being fed to a pressure swing adsorption section (PSA) for bulk separation of CO2 from methane. Regeneration of the impurity-laden adsorbent bed of the TSA section is carried out using part of the CO2 product gas recovered from the PSA section which gas is heated to thermal regeneration temperature.

대표청구항 ▼

In the process for purification and recovery of methane from landfill gas by subjecting such gas to pretreatment for removal of trace impurities therefrom followed by bulk separation of CO2 from CH4 from the pretreated gas by selective adsorption, the improvement which comprises; effecting such pretreatment in a multi-column temperature swing adsorption section integrated with a subsequent multi-column pressure swing adsorption section in which the separation of CO2 from CH4 is carried out, wherein a portion of the separated CO2 product recovered from the pressure swing adsorption section is employed in regeneration of adsorbent in the temperature swing adsorption section, wherein the time cycle of adsorption and regeneration in said temperature swing adsorption section is independent of that employed in said pressure swing adsorption section, and wherein the pretreatment of the landfill gas comprises the sequence of steps: (a) selective adsorption of contained impurities therefrom in an adsorbent bed at super ambient pressure during a predetermined time period while discharging an unadsorbed effluent consisting essentially of CO2 and CH4, (b) thereafter depressuring said bed to ambient pressure level and at said ambient pressure level, (c) thermally regenerating the impurity-laden bed with hot gas obtained by heating a portion of the CO2 product gas from said pressure swing adsorption section, followed by, (d) cooling the bed, and (e) restoring the bed to super-ambient adsorption pressure; and wherein said bulk separation effected in said pressure swing adsorption section comprises at least the sequence of steps: (1) selective adsorption of CO2 at super-ambient pressure during a predetermined time period while discharging unadsorbed high purity CH4 effluent as a product, (2) depressuring of the column to near-ambient pressure potentially as a CO2 product, followed by, (3) evacuation of said column to sub-atmospheric pressure level thereby removing sorbed CO2 from said column as a CO2 product, and (4) restoring the column to super ambient pressure by introduction therein of part of the CH4 produced in step (1).

이 특허를 인용한 특허 (79)

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IPC	Description
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A62	인명구조; 소방(사다리 E06C)
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연합인증

Recovery of methane from land fill gas 원문보기

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Recovery of methane from land fill gas 원문보기

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대표청구항 ▼

연구과제 타임라인

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