Low pressure recovery of olefins from refinery offgases

Details Low pressure recovery of olefins from refinery offgases Low pressure recovery of olefins from refinery offgases

1995-01-09

1996-04-02

Capossela, Ronald C.

Refrigeration

Processes

Circulating external gas

62 40, 585867, F25J 300

Patent

active

055029710

ABSTRACT:
A low pressure cryogenic process is disclosed for recovering C.sub.2 and heavier hydrocarbons and particularly olefins from a refinery offgas containing hydrogen, methane, nitrogen oxide in addition to the C.sub.2 and heavier hydrocarbons. The conventional high pressures are eliminated and the temperatures are maintained higher than the temperature at which nitrated gums can form while still maintaining high olefin recovery. The feed is deethanized or depropanized to remove the C.sub.4 and heavier hydrocarbons at a temperature above the nitrated gum formation temperature. The overhead is then demethanized in a column using an enriching zone above the rectifying zone with a feed of C.sub.2 or heavier paraffins between these two zones.

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