초록

A process to produce liquid cryogen wherein subcooled supercritical liquid is expanded without vaporization and a portion thereof is used to carry out the subcooling by vaporization under reduced pressure.

대표청구항 ▼

A process for the production of liquid cryogen comprising: (A) compressing feed gas to a pressure at least equal to its critical pressure; (B) cooling the compressed gas to produce cold supercritical fluid; (C) subcooling the cold supercritical fluid to produce cold supercritical liquid; (D) expandi

A process for the production of liquid cryogen comprising: (A) compressing feed gas to a pressure at least equal to its critical pressure; (B) cooling the compressed gas to produce cold supercritical fluid; (C) subcooling the cold supercritical fluid to produce cold supercritical liquid; (D) expanding the cold supercritical liquid to produce liquid cryogen essentially without formation of vapor land thereafter further expanding a first portion of the expanded liquid cryogen to a lower pressure; (E) vaporizing said further expanded first portion by indirect heat exchange with subcooling cold supercritical fluid of step (C); and (F) recovering the remaining second portion of liquid cryogen as liquid product.