RESEARCH OF THE KINETICS OF THE PROCESS OF METHANE OXIDATIVE AMMONOLYSIS
DOI:
https://doi.org/10.24025/2306-4412.1.2020.193467Keywords:
hydrogen cyanide, hydrocyanic acid, catalyst, time of the contact, rate of reaction, platinum.Abstract
The main results of research of the kinetics of the process of methane oxidative ammonolysis are presented. Industrial production of hydrogen cyanide is the basis for the production of one of the important components for gold production – sodium cyanide. Now, the main method of production of sodium cyanide is based on the neutralization of hydrocyanic acid, obtained by catalytic synthesis of methane, ammonia and oxygen in a platinum catalyst, by alkali solution. The purpose of the investigation is to research kinetic parameters of the process of methane oxidative ammonolysis, namely to determine the dependence of contact time and reaction rate on technological parameters of the process. It is known that the content of platinized metals in the catalyst, as well as the number of nets in the package and its surface development, have the greatest influence on the process of methane oxidative ammonolysis. It is established that with the reduced content of the one of reagents in the initial gas mixture, namely NH3, after cyanide hydrogen synthesis reactor, a considerable amount of unreacted components of the mixture is present in contact gas. The time of the contact for platinum nets for different developed surfaces at different pressures and constant temperature of 1193 K is calculated. The number of nets in the platinum catalyst package have the greatest influence on contact time. It is proved that with increasing a linear velocity of the gas stream, the cyanide hydrogen output is increased. Based on the experimental data, the rate of the reaction of HCN formation and the flow of the diffusion process in the first order are determined. At a volumetric ammonia concentration 10,75 % vol., the rate of the reaction of cyanide hydrogen formation is 0,75 s.References
L. L. Tovazhnyanskiy, O. Ya. Loboyko, H. I. Grin, et al., The technology of bound nitrogen. Kharkiv: NTU «KhPI», 2007 [in Ukrainian].
M. E. Pozin, Mineral salt technology. Le-ningrad: Khimiya, 1974 [in Russian].
S. I. Avina, "Ways to improve the quality of cyanide sodium", in I Int. Sci. Conf. of stu-dents, postgraduates and young scientists. Chemical problems of the present (CPP-2018): abstracts coll., Vinnitsya, 2018, p. 232 [in Ukrainian].
H. Dong, J. Zhao, J. Chen, Y. Wu, and B. Li, "Recovery of platinum group metals from spent catalysts: A review", International Journal of Mineral Processing, vol. 145, pp. 108-113, 2015. doi: 10.1016/j.minpro.2015.06.009
V. V. Barchenkov, Technology of hydro-metallurgical processing of goldcontaining flotation concentrates with the use of activated carbon. Chita: Search, 2004 [in Russian].
S. I. Avina, H. I. Grin, and T. V. Shkolnikova, "Investigation of the effect of the composition of initial gas mixture on the formation of hydrogen cyanide", Visnyk Natsionalnoho tekhnichnoho universytetu «KhPI». Seriia: Khimiia, khimichna tekhno-lohiia ta ekolohiia, no. 39 (1315), pp. 27-30, 2018 [in Ukrainian].
doi: 10.20998 / 2079-0821.2018.39.05
D. Hasenberg, and L. D. Schmidt, "HCN synthesis from CH4, NH3, and O2 on clean Pt", J. of catalysis, vol. 104, рр. 441-453, 1987.
Daniel A. Hickman, Marylin Huff, and Lanny D. Schmidt, "Alternative catalyst supports for HCN synthesis and NH3 oxida-tion", Ind. Eng. Chem. Res., vol. 32, no. 5, 1993.
A. G. Knapton, "The structure of catalyst gauzes J after hydrogen cyanide produc-tion", Platinum Metals Rev., 22, (4), 1978.
Zhi-Pan Liu, and P. Hua, "General trends in the barriers of catalytic reactions on transi-tion metal surfaces", Journal of chemical physics, vol. 115, no. 11, 2001. doi: 10.1063/1.1403006
G. Deschênes, "Project development and operation", in Gold Ore Processing (Second Edition), 2016, pp. 429-445. doi:10.1016/B978-0444-63658-4.00026-8
R. K. Asamoaha, W. Skinnera, and J. Addai-Mensah, "Alkaline cyanide leaching of refractory gold flotation concentrates and bio-oxidised products: the effect of process variables", Hydrometallurgy, vol. 179, pp. 79-93, 2018. doi: 10.1016/j.hydromet.2018.05.010
E. La Torre, S. Gámez, and E. Pazmiño, "Improvements to the cyanidation process for precious metal recovery from WPCBs", in Waste Electrical and Electronic Equip-ment Recycling, 2018, pp. 115-137.
doi: 10.1016/B978-0-08-102057-9.00005-6
S. S. Bobkov, and S. K. Smirnov, Hydrocyanic acid. Moscow: Himiya, 1970 [in Russian].
V. F. Berezina, N. A. Koskina, and N. T. Meshenko, "Method for calculating technological indicators of hydrocyanic acid synthesis", Khimicheskaya tekhnologiya, no. 6, pp. 33-37, 1989 [in Russian].
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