Dealkylation in Fluid Catalytic Cracking Condition for Efficient Conversion of Heavy Aromatics to Benzene-Toluene-Xylene

Di Wang; Xiaoli Wei; Shi Shou; Jianhong Gong

doi:10.1021/acsomega.2c06507

Dealkylation in Fluid Catalytic Cracking Condition for Efficient Conversion of Heavy Aromatics to Benzene-Toluene-Xylene

ACS Omega. 2023 Mar 17;8(12):10789-10795. doi: 10.1021/acsomega.2c06507. eCollection 2023 Mar 28.

Authors

Di Wang¹, Xiaoli Wei¹, Shi Shou¹, Jianhong Gong¹

Affiliation

¹ Sinopec Research Institute of Petroleum Processing Co., Ltd., Beijing 100083, China.

Abstract

Based on the characteristics of typical C₉ ⁺ aromatics in naphtha fractions, the effects of key process parameters and heavy aromatic composition on product distribution of fluid catalytic cracking (FCC) of heavy aromatics (HAs) were investigated. The results show that catalysts with large pore size and strong acid sites are favorable for the conversion of HAs to benzene-toluene-xylene (BTX) at higher reaction temperatures and moderate catalyst-oil ratios (C/O). With a Y zeolite-based catalyst which was hydrothermally pretreated for 4 h, the conversion of Feed 1 at 600 °C and C/O of 10 may reach 64.93%. Meanwhile, the yield and selectivity of BTX are 34.80 and 53.61%, respectively. The proportion of BTX can be adjusted within a certain range. The HAs from different sources show high conversion and good BTX selectivity, which provides strong support for the technological development of HAs to light aromatics in FCC operation.