Process for separating isobutene from C.sub.4 streams
AssigneeChemical Research & Licensing Company
InventorLawrence A. Smith, Jr.
Life of this patent
Estimating the term…
Abstract
A method for the separation of isobutene from a mixture comprising n-butene and isobutene comprising feeding a C.sub.4 stream containing n-butene and isobutene to a distillation column reactor into a feed zone contacting the stream with fixed bed acidic cation exchange resin to form diisobutene which passes to the bottom of the column, said n-butene being removed overhead. The reaction and distillation occur concurrently.
Claims14
A method of separating isoolefins from a mixture containing isoolefins and normal olefins comprising:
- (a) feeding a mixture containing an isoolefin and the corresponding normal olefin to a distillation column reactor into a feed zone,
- (b) concurrently in said distillation column reactor:
- (1) contacting said mixture with a fixed bed acidic cation exchange resin, thereby catalytically reacting the isoolefin with itself to form a dimer, and
- (2) fractionating the resulting mixture of dimer and normal olefin in said fixed bed acidic cation exchange resin,
- (c) withdrawing the dimer from the distillation column at a point below said feed zone, and
- (d) withdrawing the normal olefin from the distillation column at a point above the acidic cation exchange resin.
A method for separating isobutene from a mixture containing n-butene and isobutene comprising:
- (a) feeding a mixture containing n-butene and isobutene to a distillation column reactor into a feed zone,
- (b) concurrently:
- (1) contacting said mixture with a fixed bed acid cation exchange resin, thereby catalytically reacting isobutene with itself to form diisobutene, and
- (2) fractionating the resulting mixture comprising diisobutene and n-butene,
- (c) withdrawing said diisobutene from said distillation column reactor at a point below said feed zone, and
- (d) withdrawing n-butene from said distillation column reactor at a point above the feed zone.
A method of preparing diisobutene comprising:
- (a) feeding a C.sub.4 hydrocarbon stream containing isobutene to a distillation column reactor into a feed zone,
- (b) concurrently in said distillation column reactor:
- (1) contacting said stream with a fixed bed acid cation exchange resin, thereby catalytically reacting isobutene with itself to form diisobutene, and
- (2) fractionating the resulting mixture of C.sub.4 hydrocarbons and diisobutene in said fixed bed acidic cation exchange resin, and
- (c) withdrawing said diisobutene from said distillation column reactor at a point below said feed zone.
A method for separating isobutene from a C.sub.4 hydrocarbon stream comprising feeding a C.sub.4 hydrocarbon stream containing isobutene to a distillation column reactor containing a fixed bed acid cation exchange resin, contacting said C.sub.4 stream with said resin by distillation, thereby catalytically reacting isobutene with itself to form diisobutene, removing diisobutene from the column below said fixed bed and concurrently removing a C.sub.4 concentrate greatly reduced in isobutene from the column above said fixed bed.
A method for separating isoolefins from a mixture containing isoolefins and normal olefins comprising:
- (a) feeding a water saturated mixture containing an isoolefin and the corresponding normal olefin to a distillation column reactor into a feed zone,
- (b) concurrently in said distillation column reactor:
- (1) contacting said mixture with a fixed bed acidic cation exchange resin, thereby catalytically reacting the isoolefin with itself to form a dimer, and
- (2) fractionating the resulting mixture of dimer and normal olefin in said fixed bed acidic cation exchange resin,
- (c) withdrawing the dimer from the distillation column at a point below said feed zone, and
- (d) withdrawing the normal olefin from the distillation column at a point above the acidic cation exchange resin.
A method of preparing diisobutene comprising:
- (a) feeding a water saturated C.sub.4 hydrocarbon stream containing isobutene to a distillation column reactor into a feed zone,
- (b) concurrently in said distillation column reactor:
- (1) contacting said stream with a fixed bed acid cation exchange resin, thereby catalytically reacting isobutene with itself to form diisobutene, and
- (2) fractionating the resulting mixture of C.sub.4 hydrocarbons and diisobutene in said fixed bed acidic cation exchange resin, and
- (c) withdrawing said diisobutene from said distillation column reactor at a point below said feed zone.
A method for separating isoolefins from a mixture containing isoolefins and normal olefins comprising:
- (a) feeding a substantially anhydrous mixture containing an isoolefin and the corresponding normal olefin to a distillation column reactor into a feed zone,
- (b) concurrently in said distillation column reactor:
- (1) contacting said mixture with a fixed bed acidic cation exchange resin, thereby catalytically reacting the isoolefin with itself to form a dimer, and
- (2) fractionating the resulting mixture of dimer and normal olefin in said fixed bed acidic cation exchange resin,
- (c) withdrawing the dimer from the distillation column at a point below said feed zone, and
- (d) withdrawing the normal olefin from the distillation column at a point above the acidic cation exchange resin.
A method of preparing diisobutene comprising:
- (a) feeding a substantially anhydrous C.sub.4 hydrocarbon stream containing isobutene to a distillation column reactor into a feed zone,
- (b) concurrently in said distillation column reactor:
- (1) contacting said stream with a fixed bed acid cation exchange resin, thereby catalytically reacting isobutene with itself to form diisobutene, and
- (2) fractionating the resulting mixture of C.sub.4 hydrocarbons and diisobutene in said fixed bed acidic cation exchange resin, and
- (c) withdrawing said diisobutene from said distillation column reactor at a point below said feed zone.
Dependencies are inferred from the claim text.