Process for making cyclohexylbenzene

Details Process for making cyclohexylbenzene Process for making cyclohexylbenzene

2008-10-10

2009-08-25

Dang, Thuan Dinh (Department: 1797)

Chemistry of hydrocarbon compounds

Plural serial diverse syntheses

With hydrocarbon recycle from later to earlier synthesis

C585S314000, C585S318000, C585S319000, C585S320000, C585S323000

Reexamination Certificate

active

07579511

ABSTRACT:
Provided is a process for making cyclohexylbenzene. The process includes the following steps: (a) contacting benzene and hydrogen in the presence of a first catalyst under hydroalkylation conditions sufficient to form a first effluent stream having cyclohexylbenzene, cyclohexane, methyl cyclopentane, and unreacted benzene; (b) supplying at least part of said first effluent stream to a first separation system to divide said first effluent stream part into a cyclohexane/methylcyclopentane-rich stream, a cyclohexane-rich stream, a benzene-rich stream, and a dicyclohexyl benzene-rich stream; (c) recycling at least part of the benzene-rich stream to the contacting step (a); (d) contacting the cyclohexane/methylcyclopentane-rich stream with a second catalyst that catalyzes dehydrogenation and exhibits low acidity under conditions sufficient to convert at least a portion of the cyclohexane to benzene and at least a portion of the methylcyclopentane to linear and/or branched paraffins to form a second effluent stream; and (e) recycling at least part of the second effluent stream to the contacting step (a).

REFERENCES:
patent: 3962362 (1976-06-01), Suggitt
patent: 4094918 (1978-06-01), Murtha et al.
patent: 4122125 (1978-10-01), Murtha et al.
patent: 4177165 (1979-12-01), Murtha et al.
patent: 4206082 (1980-06-01), Murtha et al.
patent: 5053571 (1991-10-01), Makkee
patent: 6037513 (2000-03-01), Chang et al.
patent: 6489529 (2002-12-01), Cheng et al.
patent: 177505 (1977-07-01), None
U.S. Appl. No. 61/047,821, filed Apr. 25, 2008, ExxonMobil Chemical Patents, Inc.
Neftekhimiya, V17, N. 5705-9, Sep.-Oct. 1977, “A Commercial Synthesis of Phenylcyclohexane ((PHCH)) by the Hydrodimerization of Benzene”.

Affiliated with

Also associated with

Rating

Process for making cyclohexylbenzene does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for making cyclohexylbenzene, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for making cyclohexylbenzene will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4090119