ИСПОЛЬЗОВАНИЕ ГИДРОКРЕКИНГА ПРИ ПЕРЕРАБОТКЕ СВЕРХВЯЗКОЙ НЕФТИ АШАЛЬЧИНСКОГО МЕСТОРОЖДЕНИЯ

Abstract

The high necessity of development of innovative technologies for heavy oil processing is caused by decreasing reserves and increasing volumes of conditioned oil and gas fields in the world. One of the alternatives to primary processing of heavy oils, implemented at the fields, can be technologies based on extraction processes to obtain deasphalted oil. The present study is aimed at studying the products of various stages of hydrotreating of heavy high-sulfur deasphalted oil from the Ashalchinskoye field (Tatarstan, Russia) in the presence of aluminocobaltmolybdenum and aluminoplatinum catalysts. Conversion of deasphalted heavy oil on aluminocobaltmolybdenum catalyst in the hydrocracking process led to changes in the properties and composition of distillate fractions. Decrease in the content of bicyclic aromatic hydrocarbons, increase in the amount of monocycloaromatic and paraffin-naphthenic hydrocarbons, decrease in refractive indices, density and viscosity of distillate fractions were found. The revealed regularities in the composition of hydrotreating products testify to the hydrogenation reactions of polycyclic aromatic compounds, naphthene rings splitting, decomposition of long paraffin chains and their isomerization. It was shown that sulfur compounds contained in different fractions of deasphalted heavy oil differ in their stability to transformation reactions under conditions of catalytic hydrogenation on aluminocobalt-molybdenum catalyst. The second stage of hydrogenation on aluminoplatinum catalyst allowed to reduce the sulphur content in the final product to 0.035 % wt. The obtained data on the composition and technological properties of products of catalytic hydrotreating of heavy deasphalted oil from Ashalchinskoye field indicate the possibility of using widely available aluminocobaltmolybdenum catalysts in processing to obtain high quality hydrocarbon feedstock for petrochemical processes.