Method for producing oxygen

Application Number: 00107530
Application Date: 2000.05.17
Publication Number: 1274829
Publication Date: 2000.11.29
Priority Information: 1999/5/21 JP 142030/99
International: F25J3/04
Applicant(s) Name: Kobe Steel, Ltd.
Inventor(s) Name: Yamamoto Seiichi;Asahara Kazuhiko;Tanaka Masayuki
Patent Agency Code: 11021
Patent Agent: yan fang
Abstract Liquid oxygen, which is extracted from the bottom of a lower pressure rectifier and compressed by a liquid oxygen pump to a predetermined supply pressure, is evaporated in a main heat exchanger to prepare an oxygen gas product, while oxygen gas is circulated in the main heat exchanger at a linear velocity which is equal to or higher than the terminal velocity, calculated depending on the supply pressure, of an oxygen droplet having a diameter of 200 mum. This process effectively prevents precipitation of heavy impurities in the heat exchanger and produces higher pressure oxygen gas at reduced operational costs.