Organic compounds -- part of the class 532-570 series – Organic compounds – Oxygen containing
Patent
1991-05-06
1992-11-24
Mars, Howard T.
Organic compounds -- part of the class 532-570 series
Organic compounds
Oxygen containing
203DIG6, C07C 4106
Patent
active
051664542
ABSTRACT:
A multistage process for etherifying C.sub.4.sup.+ aliphatic hydrocarbon feedstock containing isoalkane including the step of contacting the hydrocarbon feedstock with dehydrogenation catalyst at elevated temperature under dehydrogenation reaction conditions to obtain C.sub.4.sup.+ isoalkene and hydrogen, and separating dehydrogenation effluent to obtain an olefinic stream rich in isoalkene and a hydrogen stream.
The olefinic stream and aliphatic alcohol are contacted in an esterification stage under partial etherification conditions with a regenerable inorganic metal oxide acid solid catalyst to convert a major amount of the isoalkene to C.sub.5.sup.+ tertiary-alkyl ether. In the preferred embodiment, effluent recovered from the first stage containing ether product, unreacted alcohol and unreacted olefin including isoalkene is charged to a second stage catalytic distillation column containing solid acid resin etherification catalyst in a plurality of fixed bed catalysis-distillation zones to complete substantially full etherification of isoalkene.
At least a portion of recovered hydrogen is employed for contacting the regenerable etherification catalyst to remove feedstock impurity and coke and to restore acid activity. In the manufacture of MTBE, the alcohol consists essentially of methanol and the C4+ feedstock consists predominantly of C.sub.4 hydrocarbons containing isobutane. The first etherification stage catalyst may comprise medium pore zeolite and the second stage catalyst may comprise polymeric sulfonic acid resin.
REFERENCES:
patent: 4417088 (1983-11-01), Miller
patent: 4906788 (1990-03-01), Scott et al.
patent: 5013329 (1991-05-01), Bell et al.
patent: 5015782 (1991-05-01), Harandi et al.
Chu et al., Ind. Eng. Chem. Res. 1987, 26, 365-369.
Harandi Mohsen N.
Owen Hartley
Mars Howard T.
McKillop Alexander J.
Mobil Oil Corporation
Speciale Charles J.
Wise L. G.
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