Thermal transformations of deasphaltenized oil in the presence of butyl bromide

Abstract

Thermal transformations of heavy deasphaltenized oil in the presence of butyl bromide (C4H9Br) are studied. Cracking in the presence of C4H9Br is carried out at 450°C for 2 hours in the isothermal mode. The material balance of the process is determined from the yield in gaseous, solid, and liquid products. It is shown that the yield in solid products increases during the cracking in the presence of C4H9Br, while the yields in gases during cracking with and without the additive are similar. Changes in the composition of liquid cracking products are studied. Cracking in the presence of С4Н9Br results in a decrease in the amount of resins by 2.0–2.5 times as compared with their content in the initial deasphaltenized oil and products of its cracking without the additive. In cracking products in presence of C4H9Br, the content of n-alkanes increases, and the content of low molecular C11–C19 homologues increases significantly. It is shown that the addition of butyl bromide results in an increase in the yield of distillate fractions bp-360°C by 1.8 times as compared with the cracking without the additive. It is found out that during the cracking of deasphaltenized oil with C4H9Br, the deep destruction of resins is observed. Hydrocarbons also undergo a transformation due to dealkylation and dehydrogenation reactions.