Feedstock preparation and conversion of oxygenates to olefins

Patent · Tue Oct 11 04:00:00 EDT 1988

OSTI ID:6632379

Harandi, M N; Owen, H; Smyth, S C

This patent describes a continuous process for converting crude methanol to olefinic hydrocarbons in a catalytic reaction zone with a crystalline acid zeolite catalyst at elevated temperature comprising the steps of: (a) contacting a crude methanol feedstock containing a minor amount of water with a liquid hydrocarbon extraction stream rich in propane and lighter hydrocarbons 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 the extracted methanol substantially free of water to the catalytic reaction zone under process conditions for converting methanol to predominantly C/sub 2/-C/sub 5/ olefinic hydrocarbons; (c) cooling reaction effluent to recover aqueous liquid byproduct, gas rich in C/sub 3//sup -/ hydrocarbons, and product comprising C/sub 4//sup +/ hydrocarbons; and (d) condensing and recycling at least a portion of the C/sub 3-/ liquid phase to step (a) for use as propane-rich extraction liquid.

• Assignee: Mobil Oil Corp., New York, NY
• Patent Number(s): US 4777321
• OSTI ID: 6632379
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020400* -- Petroleum-- Processing
ACIDIFICATION
ALCOHOLS
ALKANES
ALKENES
CATALYSIS
CATALYSTS
CHEMICAL COMPOSITION
CHEMICAL PREPARATION
EVAPORATION
EXTRACTION
HYDROCARBONS
HYDROXY COMPOUNDS
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
MATERIALS
METHANOL
MINERALS
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PRODUCTION
PROPANE
SEPARATION PROCESSES
SYNTHESIS
ZEOLITES