Natural Gas Processing Refinery Gas Processing Hydrogen Recovery Purge Gas Processing		...Refinery Gas     Processing
		Off Gas Recovery for Ethylene-Plus Off Gas Recovery for Propane-Plus      Off Gas Recovery for Ethylene-Plus 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: Features______________________________ Wide Feedstock Flexibility Absorption-based system offers inherent flexibility for ever-changing flow and compositions common to refinery off-gases. High Component Recovery Ethylene recovery typically exceeds 95+%. Hydrogen recovery across the AET Process HRU exceeds 95+%. Tolerance for NOx and 'Blue Ice' The prevalent non-cryogenic operating temperatures avoid the region where NOx and 'blue ice' have been reportedly found. Inexpensive Metallurgy Lowest temperature, limited by the C3 refrigeration system, permits the use of carbon steel metallurgy predominantly. [TECH]  [CONSULT]  [PAPERS]  [ABOUT]   Copyright © 2004 by Advanced Extraction Technologies, Inc. All rights reserved. Advanced Extraction Technologies, Inc.         2 Northpoint Drive, Suite 820 Houston, Texas 77060-3237 USA                Phone: (281) 447-0571 Facsimile: (281) 447-5601     E-mail: seekinfo@aet.com