GB720064A - Process for the preparation of benzene and benzene homologues - Google Patents
Process for the preparation of benzene and benzene homologuesInfo
- Publication number
- GB720064A GB720064A GB19137/52A GB1913752A GB720064A GB 720064 A GB720064 A GB 720064A GB 19137/52 A GB19137/52 A GB 19137/52A GB 1913752 A GB1913752 A GB 1913752A GB 720064 A GB720064 A GB 720064A
- Authority
- GB
- United Kingdom
- Prior art keywords
- fraction
- cycloalkanes
- separated
- dehydrogenation
- hydrogen
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C5/00—Preparation of hydrocarbons from hydrocarbons containing the same number of carbon atoms
- C07C5/32—Preparation of hydrocarbons from hydrocarbons containing the same number of carbon atoms by dehydrogenation with formation of free hydrogen
- C07C5/367—Formation of an aromatic six-membered ring from an existing six-membered ring, e.g. dehydrogenation of ethylcyclohexane to ethylbenzene
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/582—Recycling of unreacted starting or intermediate materials
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Benzene and its homologues are prepared by subjecting C6 cycloalkanes viz. methyl cyclopentane, cyclohexane and mixtures thereof, to dehydrogenation in the vapour phase at an elevated temperature in the presence of a gas containing hydrogen and a platinum catalyst under pressure to form benzene, separately subjecting cycloalkanes having more than 6 carbon atoms to dehydrogenation in the vapour phase at an elevated temperature in the presence of a platinum catalyst and a gas containing hydrogen to form benzene homologues, the gas containing hydrogen being under such a pressure that the gas separated from the hydrocarbon products after this dehydrogenation is under a pressure higher than that employed in the dehydrogenation of the C6 cycloalkanes and using this separated gas, wholly or in part, in the dehydrogenation of the C6 cycloalkanes. The C6 cycloalkanes may be contained in a hydrocarbon fraction having a boiling range closely approximating to their boiling points. Similarly, the higher cycloalkanes may be a fraction from the same or different source. The C6 hydrocarbons are preferably treated at 450-525 DEG C., under 10-15 atmospheres hydrogen pressure and the higher hydrocarbons at similar temperatures under 20-50 atmospheres. The catalyst is preferably used on an acidic carrier, e.g. alumina-silica or alumina treated with a hydrohalic acid or otherwise containing halogen. The hydrocarbons are usually fed at the rate of 1-10 liquid volumes per volume of catalyst per hour and the hydrogen is used in molar amounts of 2-10 times that of the hydrocarbon. In a process illustrated by a flow sheet (not shown) a petroleum fraction rich in C6-8 cycloalkanes is separated into C6 and C7-8 fractions. The C6 fraction is passed with hydrogen through a series of reactors containing the catalyst under the specified conditions, the mixture being heated prior to entering each reactor and the final products are separated into a benzene-rich fraction and a gas containing hydrogen, part of which is recycled. The C7-8 is likewise treated with hydrogen in a similar series of reactors but at a higher pressure and the products are separated into a toluenexylene fraction and a gas containing hydrogen, part of which is recycled and the remainder fed into the stream of C6 hydrocarbons treated in the lower pressure hydrogenation. If desired, the C7-8 fraction may be separated into C7 and C8 fractions and each separately dehydrogenated as above, the C8 fraction being treated under a still higher pressure and the gas separated from the xylene product being used in the dehydrogenation of the C7 fraction.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL720064X | 1951-07-31 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB720064A true GB720064A (en) | 1954-12-15 |
Family
ID=19815173
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB19137/52A Expired GB720064A (en) | 1951-07-31 | 1952-07-29 | Process for the preparation of benzene and benzene homologues |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB720064A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009131769A1 (en) * | 2008-04-25 | 2009-10-29 | Exxonmobil Chamical Patents Inc. | Process for producing phenol and/or cyclohexanone |
US8802907B2 (en) | 2010-02-05 | 2014-08-12 | Exxonmobil Chemical Patents Inc. | Dehydrogenation process |
US8884088B2 (en) | 2010-02-05 | 2014-11-11 | Exxonmobil Chemical Patents Inc. | Dehydrogenation process |
US9580368B2 (en) | 2010-12-17 | 2017-02-28 | Exxonmobil Chemical Patents Inc. | Dehydrogenation process |
-
1952
- 1952-07-29 GB GB19137/52A patent/GB720064A/en not_active Expired
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009131769A1 (en) * | 2008-04-25 | 2009-10-29 | Exxonmobil Chamical Patents Inc. | Process for producing phenol and/or cyclohexanone |
US8247627B2 (en) | 2008-04-25 | 2012-08-21 | Exxonmobil Chemical Patents Inc. | Process for producing phenol and/or cyclohexanone |
US8802907B2 (en) | 2010-02-05 | 2014-08-12 | Exxonmobil Chemical Patents Inc. | Dehydrogenation process |
US8884088B2 (en) | 2010-02-05 | 2014-11-11 | Exxonmobil Chemical Patents Inc. | Dehydrogenation process |
US9580368B2 (en) | 2010-12-17 | 2017-02-28 | Exxonmobil Chemical Patents Inc. | Dehydrogenation process |
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