Secondary deethanizer to debottleneck an ethylene plant

Details Secondary deethanizer to debottleneck an ethylene plant Secondary deethanizer to debottleneck an ethylene plant

2007-04-24

2007-04-24

Doerrler, William C. (Department: 3744)

Refrigeration

Cryogenic treatment of gas or gas mixture

Separation of gas mixture

Reexamination Certificate

active

10710676

ABSTRACT:
A process for deethanizing light hydrocarbons comprising olefins is disclosed. A feed stream, comprising ethylene, ethane, propylene, and propane, is supplied to a primary deethanizer24, having absorption and stripping sections. The absorption section produces an overhead vapor effluent128, consisting primarily of ethylene and ethane, which is supplied to a C2 splitter to separate ethane and ethylene. The stripping section produces a primary deethanizer bottoms stream having an ethane concentration from 1 to 20 mole percent of the feed ethane. The primary deethanizer bottoms120are cooled and supplied to a secondary deethanizer142having absorption and stripping sections. The absorption section is refluxed, producing an overhead effluent154essentially free of ethylene. The stripping section is refluxed to produce a secondary deethanizer bottoms stream essentially free of ethane. The secondary deethanizer bottoms stream is supplied to a depropanizer or C3 splitter for separation of the remaining olefins.

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