The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 10, 1981
Filed:
May. 14, 1980
Michimasa Okabe, Kudamatsu, JP;
Shozi Koyama, Kudamatsu, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
In a low pressure type air separation apparatus provided with a reversing heat exchanger for removing water vapor and carbon dioxide gas in feed air, a nitrogen gas taken out of a high pressure column in a duplex type rectification tower is led to an expander for generating subcooling for the air separation apparatus, and the effluent nitrogen gas is obtained under a predetermined pressure by controlling a pressure of the effluent gas from the expander. The effluent nitrogen gas is adjusted to a temperature satisfactory for the inlet temperature conditions for the reversing heat exchanger by passing the effluent nitrogen gas through a heat exchanger, and then is passed through the reversing heat exchanger, whereby the effluent gas from the reversing exchanger is obtained as a product nitrogen gas under a predetermined pressure.