화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.21, 1077-1088, January, 2015
DOI10.1016/j.jiec.2014.05.018  Export Citation
Influence of toluene-tetramethylbenzene transalkylation on heavy aromatics conversion to xylenes
Sulaiman S. Al-Khattaf†, Syed A. Ali1, Mogahid S. Osman2, and Abdullah M. Aitani3
  • Center of Research Excellence in Petroleum Refining & Petrochemicals, King Fahd University of Petroleum & Minerals, PO Box 898, Dhahran 31261, Saudi Arabia
  • 1Center of Research Excellence in Petroleum Refining & Petrochemicals, King Fahd University of Petroleum & Minerals, KFUPM Mail Box 341, Dhahran 31261, Saudi Arabia
  • 2Center of Research Excellence in Petroleum Refining & Petrochemicals, King Fahd University of Petroleum & Minerals, KFUPM Mail Box 5040, Dhahran 31261, Saudi Arabia
  • 3Center of Research Excellence in Petroleum Refining & Petrochemicals, King Fahd University of Petroleum & Minerals, KFUPM Mail Box 883, Dhahran 31261, Saudi Arabia
E-mail:
Transalkylation of toluene.tetramethylbenzene (TeMB) over MOR and BEA was investigated at 250-400 ℃. Conversion of TeMB was higher than trimethylbenzene (TMB) and toluene. Xylene yield was in the following order: [toluene - TMB - TeMB]>[toluene - TeMB]>[toluene - TMB]≫[toluene]. Kinetic modeling for reaction network consisting of toluene.TeMB transalkylation; toluene disproportionation; and toluene-TMB transalkylation was carried out. Toluene-TeMB transalkylation rate was >50% higher than the toluene-TMB transalkylation while the toluene disproportionation was an order of magnitude slower than transalkylation reactions. An addition of 5-10 wt.% TeMBs to the heavy reformate caused minor impact on the xylene yield but an improvement in xylene selectivity.
Keywords:Transalkylation;Zeolite beta;Mordenite;ZSM-5;Xylenes
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