Alkylation of benzene with isopropyl alcohol over SAPO-5 catalyst in an integral pressure reactor

The alkylation of benzene with isopropyl alcohol was studied in an integral pressure reactor over silicon substituted aluminophosphate molecular sieves, SAPO-5. The influence of various process parameters such as temperature, pressure, time on stream, weight hourly space velocity, and mole ratio of...

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Bibliographic Details
Published inCatalysis letters Vol. 79; no. 1-4; pp. 69 - 73
Main Authors SRIDEVI, U, PRADHAN, Narayan C, RAO, B. K. B, SATYANARAYANA, C. V, RAO, B. S
Format Journal Article
LanguageEnglish
Published Dordrecht Springer 01.04.2002
Springer Nature B.V
Subjects
Alcohol
Alkylation
Aluminum phosphate
Benzene
Catalysis
Catalytic reactions
Chemistry
Cumene
Exact sciences and technology
General and physical chemistry
Hydrocarbons
Integrals
Isopropanol
Molecular sieves
Process parameters
Selectivity
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
Catalytic reaction
Hydrocarbon
Catalyst selectivity
Propanol
Experimental study
Alkylation
Molecular sieve
Heterogeneous catalysis
Benzene
Cumene
Secondary alcohol
Catalyst activity
Aluminium phosphate
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Summary:The alkylation of benzene with isopropyl alcohol was studied in an integral pressure reactor over silicon substituted aluminophosphate molecular sieves, SAPO-5. The influence of various process parameters such as temperature, pressure, time on stream, weight hourly space velocity, and mole ratio of reactants on cumene yield and selectivity were investigated. The activity of SAPO-5 was compared with that of Hbeta for this reaction under similar conditions and in the same reactor. At pressures higher than atmospheric, almost the theoretical maximum yields of cumene were achieved on this SAPO-5. Among the diisopropyl benzenes formed by the alkylation of cumene, the meta-isomer was found to form in a significant amount followed by the para-isomer. The ortho-isomer with relatively high strain energy of 4.26 kcal/mol was almost negligible. The cumene yield goes through a maximum in the temperature range 498-543 K studied. Cumene selectivity was found to decrease at higher temperatures, higher pressures and lower benzene to isopropanol mole ratios.
ISSN:1011-372X
1572-879X
DOI:10.1023/A:1015348402324