Intellectual Property India Publishes Patent Application for Process For Cryogenic Air Separation And Air Separation Plant

MUMBAI, India, Aug. 10 -- Intellectual Property India has published a patent application (202617077071 A) filed by Linde Gmbh on June 22, 2026, for Process For Cryogenic Air Separation And Air Separation Plant.

Inventor includes Golubev, Dimitri.

The application for the patent was published on July 31, 2026, under issue no. 31/2026.

Abstract: This process for cryogenic air separation and the respective air separation plant use a high-pressure column (101), high-pressure column (101) and low-pressure column (102), a usual main condenser (103) and a crude argon column (107a/b/c) connected to the low-pressure column (102) at a first intermediate position, the argon transition. A second nitrogen top gas (40) is withdrawn from the top of the low-pressure column (102) and used as recycle nitrogen (41, 42, 44,47,48), recycled nitrogen (48) being introduced in gaseous form (48) into the high-pressure column (101) and/or into the main condenser (103) and/or into a bottom reboiler of a separation column (81,77). The air separation plant further comprises a medium-pressure column (104) being operated at intermediate pressure and fed by a first oxygen-enriched fraction (33, 34) from the high-pressure column (101) is introduced as feed into the medium-pressure column (104). A portion (38) of the argon transition fraction is introduced as heating medium into a bottom evaporator (106) of the medium-pressure column (104). A first portion (362) of the third nitrogen top gas (361) from the medium-pressure column (104) in gaseous form, warmed in the main heat exchanger (9) und finally withdrawn as gaseous nitrogen product (UHPGAN). A second portion (53) of the third nitrogen top gas (361) is liquefied in the top condenser (105) of the medium-pressure column (104) and used as reflux in the medium-pressure column (104). A second oxygen-enriched fraction is withdrawn from the medium-pressure column (104) and introduced into the top condenser (105) of the medium- pressure column (104) as cooling medium (38). At least a portion of the oxygen-enriched gas (36) produced in the top condenser (10) is introduced into the low- pressure column (102) at a second intermediate position at least 25 theoretical trays above the first intermediate position.

Disclaimer: Curated by HT Syndication.