Dehydrogenation process
AssigneeExxonMobil Chemical Patents Inc.
InventorsTeng Xu, Edward A. Lemon, Jr., Tan-Jen Chen, Terry E. Helton
Life of this patent
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Abstract
A processes for producing a dehydrogenation reaction product stream comprising the step of contacting a hydrocarbon stream comprising cyclohexane and methyl cyclopentane with a dehydrogenation catalyst comprising at least one metal or compound thereof and at least one molecular sieve and under conditions effective to convert at least a portion of the cyclohexane to benzene and to convert at least a portion of the methyl cyclopentane to at least one paraffin. The hydrocarbon stream is produced by hydroalkylating benzene and hydrogen to form a hydroalkylation reaction product stream which is separated to yield the hydrocarbon stream.
Claims25
A dehydrogenation process comprising:
- (a) contacting benzene and hydrogen in the presence of a hydroalkylation catalyst under hydroalkylation conditions effective to form a hydroalkylation reaction product stream comprising cyclohexylbenzene, cyclohexane, methyl cyclopentane, and benzene;
- (b) dividing at least a portion of the hydroalkylation reaction product stream into a cyclohexylbenzene-rich stream and a C6-rich stream comprising cyclohexane, methyl cyclopentane, and benzene;
- and
- (c) producing a dehydrogenation reaction product stream comprising the step of contacting at least a portion of the C6-rich stream with a dehydrogenation catalyst comprising at least one metal or compound thereof and at least one molecular sieve and under conditions effective to convert at least a portion of the cyclohexane to benzene and to convert at least a portion of the methyl cyclopentane to at least one paraffin.
A process for producing cyclohexylbenzene, the process comprising:
- (a) contacting benzene and hydrogen in the presence of a hydroalkylation catalyst under hydroalkylation conditions effective to form a hydroalkylation reaction product stream comprising cyclohexylbenzene, cyclohexane, methyl cyclopentane, and unreacted benzene;
- (b) dividing at least a portion of the hydroalkylation reaction product stream into (i) a C6-rich stream comprising benzene, cyclohexane, and methylcyclopentane and (ii) a cyclohexylbenzene-rich stream;
- (c) producing a dehydrogenation reaction product stream comprising the step of contacting at least a portion of the C6-rich stream with a dehydrogenation catalyst comprising at least one dehydrogenation metal or compound thereof and at least one molecular sieve and the contacting being conducted under conditions effective to convert at least a portion of the cyclohexane to benzene and at least a portion of the methylcyclopentane to at least one paraffin;
- (d) separating at least a portion of the dehydrogenation reaction product stream produced into a benzene recycle stream and a paraffins-rich stream comprising 2-methylpentane and 3-methylpentane;
- (e) recycling at least a portion of the benzene recycle stream to the contacting step (a);
- and
- (f) recovering cyclohexylbenzene from the cyclohexylbenzene-rich stream.
Dependencies are inferred from the claim text.