Appeal No. 95-4665
Application No. 08/101,111
APPENDIX
1. In the process for the production of diisopropyl
ether by hydration and etherification of hydrocarbon feedstock
containing propene, propane and C - light gas components,
2
which comprises contacting the feedstock and water in a
catalytic reactor containing porous solid acidic olefin
hydration catalyst under olefin hydration and etherification
conditions, the improvement which comprises:
recovering a liquid effluent stream from said catalytic
reactor containing diisopropyl ether, isopropanol, water,
unreacted propene, hydrocarbon oligomer by-product, propane
and C - light gas components;
2
separating said liquid effluent stream in a vertical
stripper column having a lower reboiler portion and an upper
contact portion;
recovering an overhead vapor stream containing propene,
propane and C - light gas components from the stripper column;
2
cooling the overhead vapor stream to provide a condensed
reflux stream rich in propene and propane;
removing the C - light gas components from the condensed
2
reflux stream;
recycling the reflux stream to the upper contact portion
of the stripper column;
recovering a predominantly C recycle stream from the
3
upper contact portion of the stripper column for recycle to
the catalytic reactor;
recovering from the stripper column an ether-rich liquid
stream containing said oligomer and isopropanol;
extracting the ether-rich liquid stream with water to
remove isopropanols in an aqueous extract stream and recover a
wet liquid product raffinate stream consisting essentially of
di-isopropyl ether, oligomer and at least 0.2 wt% water;
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