Irena Dolganova

Development of approach to modelling and optimization of non-stationary catalytic processes in oil refining and petrochemistry

Abstract An approach to modelling of non-stationary catalytic processes of oil refining and petrochemistry is proposed. The computer modelling systems under development take into account the physical and chemical reaction laws, raw materials composition, and catalyst nature. This allows using the software for the optimization of process conditions and equipment design. The models created can be applied for solving complex problems of chemical reactors design; calculation of different variants of industrial plants reconstruction; refining and petrochemicals catalysts selection and testing; catalyst service life prolongation; determination of optimum water supply into the alkanes dehydrogenation reactor; optimization of products separation in the benzene alkylation process.

Effect of thermodynamic stability of higher aromatic hydrocarbons on the activity of the HF catalyst for benzene alkylation with C9-C14 olefins

Results of thermodynamic analysis of reactions occurring during the alkylation of benzene with C9-C14 olefins, including the reversible reactions of formation of high-molecular-mass aromatic hydrocarbons, are presented. The thermodynamic relationships revealed have formed the basis for deriving a mathematical model of the alkylation process with allowance for alteration in the activity of the HF catalyst. It has been shown that the buildup of higher aromatic hydrocarbons in the alkylation reactor has a detrimental effect on the properties of HF. Operating modes and controlling parameters of the main stages of the production f linear alkylbenzenes to ensure the maximal efficiency of the process and maintain the activity of the HF catalyst at the optimal level have been determined.

Benzene alkylation with ethylene process mathematical modeling

On the example of the synthesis of ethylbenzene, an approach to reaction network formalization was proposed. This approach consists in grouping the components according to their reactivity their reactivity with respect to a specific reaction. The values of compensation degrees of reactions as an indicator of components reactivity were calculated. The kinetic model of alkylation of benzene with ethylene and heavy alkylates transalkylation was developed. The proposed approach is promising for development of mathematical modeling of multi-component processes of oil refining and petrochemical industries.

Simulation of the high-octane alkylates manufacturing considering the process unsteadiness

ABSTRACT The aim of this paper work is to study the model of the process of sulphuric-acid alkylation of isobutane using a mathematical model. The model of the object was developed considering the physicochemical regularities of the process. The paper analyzes the main processes occurring at the installation and performs the results of model verification. In addition, the technological scheme of one of the sulphuric-acid alkylation existing installations were considered. The developed program is able to calculate the composition of the obtained alkylate, to determine the yield of target products and by-products, to select optimal technological process conditions for a given raw material composition. It was noted, that the consumption of sulfuric acid increases as a result of the accumulation of high-molecular organic compounds in it, as well as its dilution with water, which enters the reactor along with the raw material and forms during the side reactions of the process.

Low-temperature separation of gas: Simulation of dynamic conditions

ABSTRACT The aim of the present paper is to increase the efficiency of low-temperature gas separation plant with use of simulation dynamic model. The paper analyzes the main processes occurring at the installation and performs the results of model verification. In addition, the technological scheme of natural low-temperature gas separation and operating parameters of one of the existing installations were considered. A non-stationary mathematical model of the chemical-technological system of low-temperature gas separation was developed. Due to the unsteady mathematical model, it became possible to estimate the time spent on the transient phenomena, as well as to choose the rate of low-temperature separation control parameters change, depending on the technological mode. Eventually, the calculations show how it is possible to avoid the instability of plant operation upset conditions at the workplace. The field of the developed model application is oil and gas industry and also higher education institutions. This software can be used to test the stability of both existing and projected low-temperature gas separation plants.