propylene

A spherically granular, amorphous, mesoporous catalyst was obtained by supporting V2O5 on synthesized by direct sol-gel method of ZrO2-SiO2 hydrogel and was identified by SEM, XRD and N2 adsorption / desorption. It is shown that its hydrothermal and alcohol treatment increases the specific surface, volume and width of pores and leads to an increase in the yield of propylene in the reaction of propane dehydrogenation and decreases the temperature of reaching its high values.

The article deals with the problems of ethylene and propylene production in the world. The optimal parameters of the pyrolysis process are described. The alternative types of raw materials are analyzed. Hydrocracking vacuum gasoil, straight-run gasoil vacuum obtained from the West-Ukrainian oil, as well as dewaxing filtrate are proposed as raw materials.  Наведено дані щодо виробництва етилену і пропілену у світі. Описано оптимальні параметри проведення процесу піролізу.

Conversion of C4 fraction of hydrocarbon pyrolysis products over high-silica zeolite catalyst ZVM modified by 2 mas % of Zn within the temperature range of 623–823 K and volumetric flow rates of 1000–10000 h-1 has been investigated. The yield and chemical composition of gaseous and liquid products have been determined under various conditions. It has been shown that the initial fraction is converted almost completely (98–100 %); the yield of C6-C8 lower arenes is 44.2–65.4 % within all investigated ranges of temperature and volumetric flow rates.

C2–C4 alkenes conversion over high-silica zeolite catalyst modified with 2 mas % of Zn has been investigated at the laboratory plant of flow type within temperatures ranges of 723–773 K and volumetric flow rates 1000–30000 h-1. It has been shown that a propylene high conversion and high yield of liquid catalizate containing lower arenes are achieved at space velocities of 20000 h-1.