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Selective hydrogenation of 3,4‐dimethoxybenzophenone in liquid phase over Pd/C catalyst in a slurry reactor
Author(s) -
Tiwari Manishkumar S.,
Yadav Ganapati D.,
Ng Flora T. T.
Publication year - 2014
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.22073
Subject(s) - catalysis , tetrahydrofuran , chemistry , selectivity , hydrogen , methanol , solvent , benzophenone , inorganic chemistry , organic chemistry , nuclear chemistry
Selective hydrogenation of benzophenone to benzhydrol is industrially relevant. In the current work, selective hydrogenation of 3,4‐dimethoxybenzophenone (3,4‐DMBP) to 3,4‐dimethoxybenzhydrol (3,4‐DMBH) was investigated over 5 % w/w Pd/C and 5 % w/w Pt/C as catalysts in a slurry reactor. The effects of hydrogen partial pressure (0.2–1 MPa), catalyst loading (2.0 × 10 −4 to 8.0 × 10 −4 g/cm 3 ), initial concentration of 3,4‐dimethoxybenzophenone (5.0 × 10 −6 to 1.5 × 10 −4 mol/cm 3 ) and temperature (40–70 °C) on rate of reaction and selectivity were studied. Effect of solvent such as methanol, ethanol, 2‐propanol and tetrahydrofuran (THF) was also investigated. 5 % w/w Pd/C was the better catalyst with THF as the best solvent, which gave 100 % conversion and 80 % selectivity in 1 h for 0.5 MPa hydrogen pressure at 60 °C. The Langmuir‐Hinshelwood‐Hougen‐Watson model was fitted. The intrinsic kinetics and mechanism of hydrogenation were established.