Fractional distillation of C.sub.2 /C.sub.3 hydrocarbons at opti

Refrigeration – Processes – Circulating external gas

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62 26, F25J 302

Patent

active

044116764

ABSTRACT:
A method of recovering by distillation the separate components of a hydrocarbon gas mixture comprising ethylene, ethane, propylene and propane which comprises separating the ethylene as an overhead from an ethane, propylene and propane bottom in a first distillation tower at from about 500 to about 650 psia, separating ethane as an overhead from a propylene and propane bottom in a second distillation tower at from about 390 to about 520 psia, and separating propylene as an overhead from a propane bottom in a third distillation tower at from about 100 to about 170 psia is disclosed.
A method of separating ethylene and ethane from propylene and propane in a first distillation tower at from about 400 to about 600 psia, separating the overhead product from the first tower in a second tower at from about 600 to about 700 psia to produce ethylene and ethane products, and separating a propylene/propane mixture in a third tower at from about 100 to about 170 psia is disclosed.
The heat for operating the propylene/propane splitter is derived from the cooling water of a heat exchange system or from hot quench tower oil.

REFERENCES:
patent: 2619814 (1952-12-01), Kniel
patent: 3390535 (1968-07-01), Marshall
patent: 4272270 (1981-06-01), Higgins

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