Extraction of crude methanol and conversion of raffinate
A continuous process is described for converting crude methanol to methyl tertiary-alkyl ethers comprising the steps of: (a) contacting a crude methanolic feedstock containing a minor amount of water with a liquid olefinic hydrocarbon extraction stream rich in C/sub 4/+ iso-alkene hydrocarbon under extraction conditions favorable to selective extraction of the methanol, thereby providing an extract liquid stream rich in methanol and an aqueous raffinate stream lean in methanol; (b) charging liquid hydrocarbon extractant and extracted methanol substantially free of water to a first catalytic reaction zone for contact with acid etherification catalyst under etherification process conditions for converting methanol and iso-alkene hydrocarbon to predominantly methyl tertiary-alkyl ether; (c) fractionating the etherification effluent from step (b) to recover unreacted vapor and to recover unreacted methanol and light olefinic hydrocarbon overhead vapor and to recover liquid product containing methyl tertiary-alkyl ether; (d) catalytically upgrading olefinic overhead vapor from step (c) to provide liquid hydrocarbon product; and (e) charging at least a portion of the aqueous raffinate stream from step (a) for conversion of methanol to hydrocarbons concurrently with olefin upgrading in step (d).
- Assignee:
- Mobil Oil Corp., New York, NY
- Patent Number(s):
- US 4827046
- OSTI ID:
- 5857488
- Resource Relation:
- Patent File Date: Filed date 11 Apr 1988
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
METHANOL
PROCESSING
METHYL ETHER
PRODUCTION
ALKENES
ALKYL RADICALS
CATALYSIS
FRACTIONATION
HYDROCARBONS
ALCOHOLS
ETHERS
HYDROXY COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
RADICALS
SEPARATION PROCESSES
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