Back to results
US 4,778,497 AGranted
Process to produce liquid cryogen
AssigneeUnion Carbide Corporation
InventorsThomas C. Hanson, Leslie C. Kun
Life of this patent
Estimating the term…
Abstract
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.
Claims24
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.
4 more elements
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) expanding the cold supercritical fluid to produce lower pressure fluid;
- (D) cooling lower pressure fluid to produce liquid cryogen and thereafter expanding a first portion of the liquid cryogen to a lower pressure;
- (E) vaporizing said expanded first portion by indirect heat exchange with the cooling lower pressure fluid of step (D);
- and
- (F) recovering the remaining second portion of liquid cryogen as liquid product.
4 more elements
A process for the production of liquid cryogen comprising:
- (A) dividing feed gas into two portions, compressing each portion separately to a pressure at least equal to its critical pressure by separate compressor means powered by expansion of some of the compressed gas through expander means, and recombining the compressed portions to form compressed gas;
- (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;
- (E) vaporizing a first portion of the expanded liquid cryogen by indirect heat exchange with subcooling cold supercritical fluid of step (C);
- and
- (F) recovering a second portion of liquid cryogen as product.
4 more elements
A process for the production of liquid cryogen comprising:
- (A) dividing feed gas into two portions, compressing each portion separately to a pressure at least equal to its critical pressure by separate compressor means powered by expansion of some of the compressed gas through expander means, and recombining the compressed portions to form compressd gas;
- (B) cooling the compressed gas to produce cold supercritical fluid;
- (C) expanding the cold supercritical fluid to produce lower pressure fluid;
- (D) cooling lower pressure fluid to produce liquid cryogen;
- (E) vaporizing a first portion of the liquid cryogen by indirect heat exchange with the cooling lower pressure fluid of step (D);
- and
- (F) recovering a second portion of liquid cryogen as product.
4 more elements
Dependencies are inferred from the claim text.