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1. (WO2018119831) PROCESS AND APPARATUS FOR ESTABLISHING VACUUM INSULATION UNDER CRYOGENIC CONDITION

Pub. No.:    WO/2018/119831    International Application No.:    PCT/CN2016/112920
Publication Date: Fri Jul 06 01:59:59 CEST 2018 International Filing Date: Fri Dec 30 00:59:59 CET 2016
IPC: F16L 59/06
Applicants: L'AIR LIQUIDE, SOCIETE ANONYME POUR L'ETUDE ET L'EXPLOITATION DES PROCEDES GEORGES CLAUDE
BRIGLIA, Alain
GUERET, Vincent
CHEN, Ren
Inventors: BRIGLIA, Alain
GUERET, Vincent
CHEN, Ren
Title: PROCESS AND APPARATUS FOR ESTABLISHING VACUUM INSULATION UNDER CRYOGENIC CONDITION
Abstract:
A process for establishing vacuum insulation under cryogenic condition and an apparatus compatible with such process are described. When an insulation enclosure filled with high purity CO2 is evacuated to around 100 absolute Pa at ambient temperature, hard vacuum of below 1 absolute Pa may be automatically obtained within the insulation enclosure when temperature drops to around or below -170℃. This process can be employed to provide vacuum insulation for cold box housing air separation units operated under cryogenic condition.