Processes and equipment for establishing vacuum insulation under cryogenic conditions

摘要

Processes for establishing vacuum insulation under cryogenic conditions and devices compatible with such processes are described. When an insulated enclosure filled with high purity CO2 is evacuated to about 100 absolute Pa at ambient temperature, when the temperature drops to about -170 ° C or less than -170 ° C, 1 Pa absolute in the insulated enclosure. Less than a high vacuum can be obtained automatically. This process can be used to provide vacuum insulation for cold box housing air separation units operated under cryogenic conditions. [Selection diagram] FIG.