Liquid-phase hydrodechlorination of chlorobenzene by molecular hydrogen: The influence of reaction medium on process efficiency

Catalytic hydrodechlorination (HDCl) of chlorobenzene was carried out in a two-phase aqueous–organic solvent system and a single-phase solvent composed of saturated KOH solution in a secondary alcohol over Pd-based catalysts at 50 °C and atmospheric pressure of H . It was shown that an aqueous–organ...

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Bibliographic Details
Published in:Pure and applied chemistry 2009-11, Vol.81 (11), p.2107-2114
Main Authors: Simagina, Valentina I., Tayban, Elena S., Grayfer, Ekaterina D., Gentsler, Anna G., Komova, Oksana V., Netskina, Olga V.
Format: Article
Language:English
Subjects:
Catalysis
Chloride ions
chlorinated organics
Chlorobenzene
Deactivation
Hydrodechlorination
isopropyl alcohol
Liquid phases
Mass transfer
Pd catalyst
Phase transfer catalysts
propan-2-ol
solvent
Solvents
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Summary:Catalytic hydrodechlorination (HDCl) of chlorobenzene was carried out in a two-phase aqueous–organic solvent system and a single-phase solvent composed of saturated KOH solution in a secondary alcohol over Pd-based catalysts at 50 °C and atmospheric pressure of H . It was shown that an aqueous–organic solvent system containing propan-2-ol and aqueous KOH increases catalyst activity by promoting mass transfer of the formed chloride ions to water phase that prevents catalyst deactivation. It is inferred that propan-2-ol favors hydrogen activation during the HDCl process. Use of the Pd catalysts based on hydrophobic carbon support enables chlorobenzene HDCl to proceed in a two-phase solvent at a satisfactory rate, even in the absence of phase-transfer catalysts.
ISSN:0033-4545
1365-3075
DOI:10.1351/PAC-CON-08-10-12