The palladium catalysed hydrogenation of 2-butyne-1,4-diol in a monolith bubble column reactor

Loop reactor staged with structured fibrous catalytic layers for liquid-phase hydrogenations

“…Linear dependency of the reaction rate as a function of hydrogen pressure was found in the pressure range from 0.1 to 2 MPa, whereas the reaction rate followed a zero order with respect to butynediol in the concentration range between 0.2 and 1 kmol m −3 . At higher butynediol concentrations, a decrease of the hydrogenation rate is observed (Chaudhari et al, 1987Winterbottom et al, 2003). The observations can be rationalised on the bases of a Langmuir-Hinshelwood model assuming competitive adsorption of the reactants and a bimolecular reaction of the adsorbed species.…”

Hydrogenation in the Vitamins and Fine Chemicals Industry – An Overview

“…The hydrogenation can also be carried out in a monolith bubble column reactor. Full conversion and high selectivity can be achieved in presence of a Pd-catalyst [50]. Scheme 13.…”

Analysis of the performance of single capillary and multiple capillary (monolith) reactors for the multiphase Pd-catalyzed hydrogenation of 2-Butyne-1,4-Diol

“…A difficulty inherent to this process is the appearance of side products as a consequence of 2-butene-1,4-diol isomerization, i.e., crotyl alcohol andhydroxybutyraldehyde. A complete reaction scheme can be found in Winterbottom et al (2003b). High selectivity values towards (C) have been usually achieved by combining two metals or by adding organic bases.…”