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ISSN 1817-2172, рег. Эл. № ФС77-39410, ВАК

Differential Equations and Control Processes
(Differencialnie Uravnenia i Protsesy Upravlenia)

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Kinetic model of the ammonium chloride sublimation process

Author(s):

Maksim Igorevich Kuzmin

Researcher, Group of the Software Development, Modeling and Digitalization,
N.P. Sazhin State Research and Design Institute of Rare Metal Industry "Giredmet",
Postgraduate student, Department of Information Computer Technologies, D. Mendeleev University of
Chemical Technology of Russia

mimikatz@mail.ru

David Ilyich Kushniruk

Head of the group, Group of the Software Development, Modeling and Digitalization,
N.P. Sazhin State Research and Design Institute of Rare Metal Industry "Giredmet"

DIKushniruk@rosatom.ru

Nikita Sergeevich Romanov

Junior researcher, Department of film materials technology, S.E. Vyatkin Scientific Research Institute of
Graphite-based Structural Materials "NIIgrafit",
Postgraduate student, Department of Nanomaterials and Nanotechnology, D. Mendeleev University of
Chemical Technology of Russia

NSRomanov@rosatom.ru

Egor Andreevich Danilov

Head of the department, Department of Functional Materials, S.E. Vyatkin Scientific Research
Institute of Graphite-based Structural Materials "NIIgrafit"

EgADanilov@rosatom.ru

Anastasia Nikolaevna Babkina

Ph.D., Associate Professor, Department of Optoinformational Materials and Technologies, ITMO National Research University

babkina.anastasya@bk.ru

Abstract:

The article discusses the process of sublimation of chemically pure ammonium chloride crystals. Instrumental studies were conducted using synchronous thermal analysis, including thermogravimetry and differential scanning calorimetry, under non-isothermal conditions with three different heating rates (3, 5, and 10 В°C/min). The data obtained from the experiments were processed using the Friedman isoconversion method. Based on the assumption that the sublimation process consists of three successive stages that can be modeled by n-th order reaction kinetics, a kinetic model was developed to describe the change in sample mass over time. Statistical and nonlinear regression techniques were used to determine the kinetic triplets for each stage. The model was then applied to predict the progression of the sublimation process under various temperature regimes. The results of the work can be used both in an independent form and in the construction of complex models of chemical processes in which it is necessary to take into account the course of a competing process of sublimation of ammonium chloride.

Keywords

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