Iso-olefin etherification, upgrading and paraffin transhydrogenation
Patent
·
OSTI ID:6126800
This patent describes a technique for converting olefinic light hydrocarbons to ether-rich liquid fuels and olefinic gasoline including etherification, olefin upgrading an transhydrogenation operations. The process comprises: reacting a fresh hydrocarbon stream containing C{sub 4} + iso-alkene with lower aliphatic alcohol in an etherification zone in contact with an acidic etherification catalyst under etherification conditions whereby an effluent stream containing C{sub 5} + tertiary-alkyl ether is produced; separating the etherification effluent stream to provide a first liquid stream comprising C{sub 5} + ether and a second stream comprising unreacted alcohol and C{sub 4} + hydrocarbons; contacting the second stream with acidic metallosilicate catalyst for conversion of oxygenates and olefins under olefin oligomerization and isomerization conditions at elevated temperature; separating oligomerization effluent to recover an intermediate hydrocarbon stream rich in C{sub 4} + paraffinic hydrocarbon, a light gas stream, and a liquid product stream comprising C{sub 6} + olefinic gasoline; contacting the C{sub 4} + intermediate hydrocarbon stream with lower alkene in the presence of transhydrogenation catalyst whereby C{sub 4} + paraffin is converted to C{sub 4} + olefin, including iso-alkene; separating transhydrogenation effluent to recover C{sub 4} + olefin containing iso-alkene; and passing at least a portion of iso-alkene to etherification zone for co-conversion with fresh hydrocarbon and alcohol to produce tertiary-alkyl ether.
- Assignee:
- Mobil Oil Corp., New York, NY (USA)
- Patent Number(s):
- A; US 4975097
- Application Number:
- PPN: US 7-454473
- OSTI ID:
- 6126800
- Country of Publication:
- United States
- Language:
- English
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