Modelling of catalytic hydrotreating and dewaxing of diesel fuel in Aspen Hysys environment

The article discusses the use of digital tools for modelling real production facilities. The oil and gas industry today is one of the key sectors of the country's economy, providing a significant part of energy resources and raw materials for industry. Digitalization plays an important role in the development of the Russian oil and gas industry. Speaking about the stable and efficient operation of oil refineries, we note the importance of the hydrotreating process. Hydrotreating is one of the key processes at refineries, playing a crucial role in improving the quality of petroleum products. This is due to the tightening of environmental requirements for commercial fuels, the need to reduce the content of catalytic poisons (metals, arsenic, silicon) in straight-run fractions and increase the chemical and physical stability of fuels. At oil refineries the dewaxing process is more often applied to diesel and oil fractions. Improvement of low-temperature properties - the result of dewaxing process - allows to use oil products in winter period and in the territory of the extreme North. The raw material of the unit is straightrun diesel fraction 180-340 ⁰С, consisting of paraffin and naphthenic hydrocarbons, containing mainly sulphur. The digital model under consideration allows estimating the efficiency of the plant operation mode, depending on the selected grade of diesel oil (summer, winter, arctic). The model also allows to predict the yield and quality of products, which helps to optimize the process conditionsto achieve the desired results; in the future, it can be used to design new units or modernize existing ones, taking into account the optimal technological scheme of the reactor unit. This allows selecting the most efficient solutions to minimize catalyst loading and improve product quality