The kinetics of the catalytic isomerization and transalkylation of cumene

Journal Article · Fri Jun 30 04:00:00 EDT 1978 · J. Catal.; (United States)

DOI:https://doi.org/10.1016/0021-9517(78)90072-6· OSTI ID:5872837

Best, D A; Wojciechowski, B W

New and previously published kinetic data for cumene cracking on lanthanum Y zeolite were used to determine the initial rates and selectivities for the primary products benzene, n-propylbenzene, cymene, m-diisopropyl benzene, p-diisopropyl benzene, isobutene, and butene at 360/sup 0/-500/sup 0/. An analysis of the activation energies and frequency factors shows that the addition of a methyl group of one cumene molecule to the benzene ring of another to form cymene is energetically favored over the insertion of the methyl group into an isopropyl side chain; that, in the formation of butenes by transfer of a methyl group from one cumene molecule to the isopropropyl group of another, the addition to the ..cap alpha..-carbon is energetically favored over additon to the ..beta..-carbon (i.e., that isobutene is the favored product); that in the disproportionation of cumene to benzene and diisopropyl benzene the meta form is the main product at 500/sup 0/C as a result of entropy (or configurational) requirements, and that at room temperature the para form is favored by the activation energy; and that the isomerization of cumene to n-propylbenzene requires almost complete rupture of the side chain. Graph and tables.

• Research Organization: Queens Univ., Kingston, Canada
• OSTI ID: 5872837
• Journal Information: J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 53:2; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020400* -- Petroleum-- Processing
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400301 -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
ACTIVATION ENERGY
ALKENES
ALKYLATION
AROMATICS
BENZENE
BUTENES
CATALYTIC CRACKING
CATALYTIC EFFECTS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CRACKING
CUMENE
DECOMPOSITION
ELEMENTS
ENERGY
ENTROPY
HIGH TEMPERATURE
HYDROCARBONS
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
ISOMERIZATION
KINETICS
LANTHANUM
MATERIALS
METALS
MINERALS
ORGANIC COMPOUNDS
OXIDATION
PHYSICAL PROPERTIES
PYROLYSIS
RARE EARTHS
REACTION KINETICS
REDUCTION
THERMOCHEMICAL PROCESSES
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENTS
YTTRIUM
ZEOLITES