Integrated etherification process with recycle post treatment

Details Integrated etherification process with recycle post treatment Integrated etherification process with recycle post treatment

1988-06-24

1989-03-28

Mars, Howard T.

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

585331, C07C 4106

Patent

active

048166073

ABSTRACT:
A multistep hydrocarbon conversion process for the production of ethers including methyl tertiary butyl ether (MTBE) from light paraffins and alcohols is disclosed. A mixture of C.sub.4 isoparaffins, normal paraffins, an etherification recycle and butane isomerization effluent enter a deisobutanizer column. Normal paraffins withdrawn from the fractionator are isomerized and returned to the fractionator, and isoparaffins are withdrawn from the fractionator and dehydrogenated. The resulting olefins enter an etherification zone for reaction of isobutene with a C.sub.2 -C.sub.5 alcohol. Unreacted paraffins and olefins comprise a portion of the etherification effluent entering the deisobutanizer. After separation for recovery of the ether product, unreacted paraffins and olefins are passed through a dehydrogenation zone for saturation of the olefins and then returned to the deisobutanizer column. Normal butanes are withdrawn as a sidecut from the deisobutanizer. The sidecut passes to an isomerization zone and a mixture of isobutane and normal butane is recycled to the deisobutanizer. In a highly preferred embodiment, spent catalyst from the isomerization zone fulfills the catalyst requirement of the dehydrogenation zone.

REFERENCES:
patent: 2720547 (1955-10-01), Wolff
patent: 3726942 (1973-04-01), Louder
patent: 4118425 (1978-10-01), Herbstman
patent: 4219678 (1980-08-01), Obenaus et al.
patent: 4252412 (1981-02-01), Herbstman
patent: 4329516 (1982-05-01), Muddarris

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