C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
260/648, 260/707
C07C 2/62 (2006.01) C07C 1/20 (2006.01) C07C 9/16 (2006.01) C07C 41/06 (2006.01) C07C 43/04 (2006.01) C10G 3/00 (2006.01) C10G 29/20 (2006.01) C10L 1/02 (2006.01) C10L 1/18 (2006.01)
Patent
CA 1275420
IMPROVED PROCESS FOR CONVERTING METHANOL TO ALKYL ETHERS ABSTRACT A multistage process for producing isoalkyl ethers from lower aliphatic oxygenate feedstock, such as methanol. Feedstock is catalytically converted in a primary catalyst stage at elevated temperature in contact with zeolite catalyst to predominantly C2-C7 lower olefins comprising isobutylene and isoamylene, by-product water and a minor amount of C8+ hydrocarbons, followed by fractionation of the C2-C7 olefins to recover a C2-C3-rich recycle stream for further catalytic conversion in the primary stage. C4-C7 olefins are passed to a second catalytic etherification stage for reaction of isoalkenes with methanol to produce methyl tertiary-butyl ether, methyl isoamylether and higher isoalkyl ethers. The second stage effluent may be fractionated to recover an ether product, C5+ hydrocarbon liquid product, and unreacted butenes. Advantageously, the unreacted butenes are further reacted with isoparaffin in a third catalytic stage under acid catalysis alkylation conditions, and fractionated to recover C6+ alkylate liquid, liquid hydrocarbon product. The ethers may be blended with at least one C6+ hydrocarbon to produce high octane gasoline.
542219
Avidan Amos A.
Krambeck Frederick J.
Tabak Samuel A.
Avidan Amos A.
Kirby Eades Gale Baker
Krambeck Frederick J.
Mobil Oil Corporation
Tabak Samuel A.
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