Influence of process conditions on product composition in the traditional and deep catalytic cracking

Abstract

In order to increase the yield of C2–C4 light olefins compared to conventional catalytic cracking we studied experimentally the effect of temperature and catalyst/feed ratio on the main products distribution of crude oil catalytic cracking on bizeolite catalyst and industrial catalyst LUX. Bizeolite catalyst contains ultrastable zeolite Y and ZSM-5 in equal amounts, the catalyst LUX – 18 % mass fraction of Y zeolite in HREE form. Test results showed that in the range of ratios catalyst/feed 5-7 and temperatures 540-560 °C with a deep catalytic cracking of the hydrotreated vacuum gasoil on bizeolite catalyst C2–C4 olefin yield reaches 32–36 wt.%. The yield of gasoline is about 30 wt.%. Under similar conditions, the cracking catalyst in a series of suites overlook light olefins and gasoline are 12–16 and 37–45 wt.%, respectively. The distribution of final products in deep catalytic cracking of various hydrocarbon fractions (vacuum gasoil, gas condensate and its fractions after distillation of boiling up to 216 °С, as well as the heavy residue hydrocracking) to bizeolite catalyst. It is shown that the fraction of gas condensate and residue hydrocracking may be an additional source of hydrocarbons in the olefin production.