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Research of olefin reduction by Prins condensation for FCC gasoline
ZHAO Dezhi1,2,3, AN Gaojun2, LU Changbo2, XIONG Chunhua2, SHANG Hongyan3
(1.School of Mechanical Engineering in Tianjin University, Tianjin 300072, China;2.Chinese People 's Liberation Army 62025 Unit, Beijing 102300, China;3.College of Science in China University of Petroleum (East China), Qingdao 266580, China)
Abstract:
The performance of olefin reduction by Prins condensation was investigated using 1-hexene and triformol as the model system. The catalytic activity of macropore cation exchange resins Amberlyst-35, DFHS-6, zeolite H-Y, and supported ionic liquid BsMIMHSO4/sg were compared, through which the Amberlyst-35 was selected. And the influences of formaldehyde origin, catalyst amount, 1-hexene triformol molar ratio, reaction temperature, reaction pressure and reaction time on the reaction were investigated. The results show that the optimal conditions are as follows:w(catalyst)∶w(raw material)=4%, n(1-hexene)∶n(triformol)=1∶1.5, the reaction temperature of 105 ℃, the reaction pressure of 1.5 MPa, the reaction time of 4 h. Under these conditions, the olefin mass fraction in gasoline is reduced from 25.1% to 12.2% (by mass) with triformol FCC Gasoline mass ratio of 1∶7, and the gasoline octane number is declined to a small extent.
Key words:  Prins reaction  oxygenated compounds  olefin reduction  gasoline