Refrigeration – Processes – Circulating external gas
Patent
1980-08-06
1982-04-06
Yudkoff, Norman
Refrigeration
Processes
Circulating external gas
62 38, 62 41, 62 26, F25J 306
Patent
active
043233805
ABSTRACT:
In a process for the rectification of a raw gaseous mixture under superatmospheric pressure and containing at least three components, e.g. natural gas wherein the gaseous mixture is fractionated in a first rectifying column into a head product largely freed of at least one higher-boiling component and into a bottoms product largely freed of at least one lower-boiling component, the improvement which comprises compressing the liquid bottoms product of the first rectifying column; passing resultant compressed bottoms product in indirect heat exchange relationship with the gaseous mixture to at least partially vaporize said bottoms product; engine-expanding resultant vaporized compressed bottoms product to form a liquid which is then passed as reflux into a second rectifying column; and fractionating resultant expanded bottoms product in said second rectifying column to form a top product containing lower-boiling components and into a sump product containing higher-boiling components.
REFERENCES:
patent: 2559132 (1951-07-01), Roberts
patent: 2600494 (1952-06-01), Ferro, Jr.
patent: 2850880 (1958-09-01), Jakob
patent: 3074245 (1963-01-01), Becker
patent: 3163511 (1964-12-01), Linde et al.
patent: 4061481 (1977-12-01), Campbell et al.
patent: 4211544 (1980-07-01), Springmann
Forg Wolfgang
Muller Karl-Heinz
Linde Aktiengesellschaft
Yudkoff Norman
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