Refrigeration – Cryogenic treatment of gas or gas mixture – Separation of gas mixture
Patent
1996-05-24
1997-11-25
Kilner, Christopher B.
Refrigeration
Cryogenic treatment of gas or gas mixture
Separation of gas mixture
62908, F25J 304
Patent
active
056899742
ABSTRACT:
The present invention offers a pre-purification method and apparatus for an air cryogenic separation plant for removing water vapor and carbon dioxide from feed air, which is able to operate at high air temperatures without the use of special installations such as pre-cooling equipment or demoisturizers to replace freon refrigerators or water spray cooling columns. One aspect of the present invention is a pre-purification method for an air cryogenic separation plant which continuously purifies feed air using a plurality of reciprocally-used adsorption columns 5a, 5b filled with adsorbents for adsorption removal of water vapor and carbon dioxide from the feed air. The method includes an adsorption step, a depressurization step, a heating step, a cooling step, and a repressurization step, whereof the adsorption step for adsorption removal of impurities is performed by feeding pressurized feed air at a temperature of 10.degree..about.45.degree. C. into an adsorption column filled with water adsorbent and carbon dioxide adsorbent arranged respectively in that order from the air entrance, at a superficial velocity of 5.about.40 cm/s. Another aspect of the present invention is a pre-purification apparatus for an air cryogenic separation plant having adsorption columns 5a, 5b filled with water adsorbent and carbon dioxide adsorbent arranged respectively in that order from the air entrance, wherein the weight ratio of the water adsorbent to the total amount of adsorbents is 0.4.about.0.7.
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Fujita Atsushi
Nakamura Morimitsu
Kilner Christopher B.
Nippon Sanso Corporation
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