[특허]VSA adsorption process with energy recovery

VSA adsorption process with energy recovery 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	B01D-053/053
출원번호	US-0606137 (1996-02-23)
발명자 / 주소	Watson Charles Franklin (Orefield PA) Agrawal Rakesh (Emmaus PA) Webley Paul Anthony (Macungie PA) Wehrman Joseph Gerard (Macungie PA)
출원인 / 주소	Air Products and Chemicals, Inc. (Allentown PA 02)
인용정보	피인용 횟수 : 44 인용 특허 : 0

초록 ▼

A vacuum swing adsorption process for separating a feed gas mixture into a more strongly adsorbable component and a less strongly adsorbable component in a process employing two vacuum pumps and three adsorbent beds containing an adsorbent selective for the more strongly adsorbable component using countercurrent depressurization and cocurrent ambient feed repressurization simultaneous with product end to product end pressure equalization and a common-shaft machinery arrangement which allows the expansion energy contained in the countercurrent depressurization and cocurrent ambient feed repressurization streams to be recovered and utilized to reduce overall process power consumption. Addition of three valves and an expander element will also allow expansion energy in the product purge and pressure equalization streams to be recovered. Oxygen product can be recovered from air at low cost using the process.

대표청구항 ▼

A process for selectively separating a more strongly adsorbable component from a less strongly adsorbable component of a feed gas mixture, in a plurality of adsorption beds containing an adsorbent selective for the more strongly adsorbable component, utilizing at least two vacuum pumps, and comprising the steps of: (a) introducing a feed gas mixture at elevated pressure containing said more strongly adsorbable component and said less strongly adsorbable component into an inlet of a first adsorption bed containing said adsorbent selective for the more strongly adsorbable component and adsorbing said more strongly adsorbable component on said adsorbent while said less strongly adsorbable component passes through said first adsorption bed unadsorbed as a product and as a source of purge gas for a second adsorption bed of said plurality of adsorption beds undergoing purge of step (e) and continuing until the adsorption front of said more strongly adsorbable component approaches an outlet of said first adsorption bed and terminating the introduction of said feed gas mixture; (b) following the termination of the introduction of said feed gas mixture into said first adsorption bed, cocurrently depressurizing said first adsorption bed to an intermediate pressure to remove a cocurrent depressurization gas to an outlet of said second adsorption bed of said plurality of adsorption beds at lower pressure undergoing repressurizing of step (f) to at least partially pressure equalize the two beds, while countercurrently depressurizing said first adsorption bed by expanding elevated pressure gas in said first adsorption bed through a first vacuum pump to recover energy from said gas to reduce the power requirement for the countercurrent evacuation of step (d); (c) countercurrently evacuating said first adsorption bed through said first vacuum pump to remove a portion of said more strongly adsorbable component; (d) continuing to evacuate said first adsorption bed through a second vacuum pump to remove an additional portion of said more strongly adsorbable component; (e) countercurrently purging said first adsorption bed with a portion of said less strongly adsorbable component from a third adsorption bed of the plurality of adsorption beds undergoing step (a) to remove a final portion of the more strongly adsorbable component from said first adsorption bed; (f) repressurizing said first adsorption bed with said cocurrent depressurization gas from said third bed of the plurality of adsorption beds undergoing said cocurrently depressurizing of step (b), and with ambient pressure feed gas mixture which expands through a feed gas blower before entering said first adsorption bed wherein the energy recovered is used to reduce the power requirement to evacuate of step (d); (g) further repressurizing said first adsorption bed with said feed gas mixture at elevated pressure; and (h) performing steps (a) through (g) in each of the plurality of adsorption beds in a phased sequence.

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