Abstract
The kinetics of hydrogenation of 4-nitro-2′-hydroxy-5′-methylazobenzene in aqueous 2-propanol solution over the skeletal nickel is investigated at different initial concentrations. It is established that the hydrogenation of 4-nitro-2′-hydroxy-5′-methylazobenzene over a skeletal nickel in azeotropic aqueous 2-propanol solution proceeds via two parallel pathways at both low and high initial concentrations. It is shown that increasing the initial concentration of the hydrogenated compound above its level of solubility raises the rate of azo group transformation in 4-nitro-2′-hydroxy-5′-methylazobenzene, while the content of 4-amino-2′- hydroxy-5′-methylazobenzene does not change in the hydrogenate and is not accumulated in the bulk of solution.
Similar content being viewed by others
References
A. V. Finkel’shtein, G. A. Reutov, and Z. M. Kuz’mina, Kinet. Katal. 17, 1223 (1976).
L. Henning and K. Sianette, Acta Chem. Scand. 22, 2879 (1968).
L. Kh. Freindlin, E. F. Litvin, and V. M. Chursina, in Catalytic Reduction and Hydrogenation in Liquid Phase (Ivanovo, 1970), p. 59 [in Russian].
N. N. Vorozhtsov, Basic Principles of the Synthesis of Intermediate Products and Dyes (Goskhimizdat, Moscow, 1955) [in Russian].
L. G. Nishchenkova, V. F. Timofeeva, V. P. Gostikin, et al., Izv. Vyssh. Uchebn. Zaved., Khim. Khim. Tekhnol. 23, 1496 (1980).
Theory and Practice of Processes of Liquid Phase Hydrogenation of Substituted Nitrobenzenes, Ed. by O. I. Koifman (KRASAND, Moscow, 2016) [in Russian].
P. Rautanen, PhD Thesis (Helsinki Univ. Technology, Finland, 2002).
E. A. Gelder, PhD Thesis (Univ. Glasgow, Glasgow, 2005).
Author information
Authors and Affiliations
Corresponding author
Additional information
Original Russian Text © Hoang Anh, M.P. Nemtseva, O.V. Lefedova, 2018, published in Zhurnal Fizicheskoi Khimii, 2018, Vol. 92, No. 4, pp. 567–572.
Rights and permissions
About this article
Cite this article
Anh, H., Nemtseva, M.P. & Lefedova, O.V. Concentration Effects in the Hydrogenation of 4-Nitro-2′-Hydroxy-5′-Methylazobenzene over Skeletal Nickel in an Aqueous 2-Propanol Solution. Russ. J. Phys. Chem. 92, 669–673 (2018). https://doi.org/10.1134/S0036024418040131
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1134/S0036024418040131