Natural Gas
Processing
Refinery Gas Processing
Hydrogen Recovery
Purge Gas Processing
- Off Gas Recovery for Ethylene-Plus
- Off Gas Recovery for Propane-Plus
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The patented Off-Gas Recovery (OGR®) Process uses conventional unit operations for non-cryogenically absorbing ethylene and heavier hydrocarbons from FCCU and delayed coker off-gases that are usually burned in refineries. After treating the gases are counter-currently contacted with chilled, pre-saturated lean solvent in an ethylene absorber which is reboiled at the bottom. The demethanized rich solvent is fractionated in the solvent regenerator to produce an overhead ethylene plus product and a bottoms lean solvent stream for returning to the top of the ethylene absorber. The solvent is simply the heavier components of the feed gas.
[click]
here for large, printable view of schematic
The ethylene plus product may be further fractionated to produce ethylene, ethane and
propylene plus products as desired for specific applications. If only C2
product recovery is required, the solvent regenerator can produce a
mixed C2
overhead stream and a C3+
bottoms solvent stream, increasing process efficiency and reducing
fractionation requirements. When desired, the contained hydrogen in the overhead stream from the
ethylene absorber may be recovered in an AET HR unit. For most applications, there are no solvent make-up requirements.
Given the low capital and operating costs, some of the additional
unique features of the OGR Process are summarized as follows:
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