Ni3CuSn0.3/SiO2催化剂上的裂解汽油C8芳烃选择性加氢反应本征动力学与固定床反应器数学模型OA北大核心CSTPCD

Styrene is an important monomer in the petrochemical industry and can be produced through the pyrolysis gasoline(PYGAS)extraction.To prevent contamination of styrene by trace amounts of phenylethylene,which leads to downstream catalyst poisoning and product non-compliance,selective hydrogenation technologies are commonly employed in industry to remove phenylethylene.The selective hydrogenation of C8 aromatic fraction of PYGAS over Ni3CuSn0.3/SiO2 catalysts was studied.The concentration variations of phenylethylene and styrene were first investigated under 60-90℃and 0.2-1.0 MPa in a stirred tank reactor using Ni3CuSn0.3/SiO2 catalyst powder.The intrinsic activation energies for phenylethylene →styrene and styrene → ethylbenzene were determined as 46.33 kJ·mol-1 and 68.95 kJ·mol-1,respectively.The effects of reaction temperature,pressure,molar ratio of H2 to phenylethylene,and phenylethylene concentration on the selective hydrogenation of C8 aromatic fraction of PYGAS were then examined in a fixed bed reactor using Ni3CuSn0.3/SiO2 catalyst pellets.A fixed-bed reactor mathematical model was established to describe the reaction process and the variation of effectiveness factors for each component along the reactor axis was analyzed.The experimental results validated the accuracy of the fixed-bed reactor mathematical model,with average absolute relative errors between experimental and predicted values of outlet concentrations for phenylethylene,styrene,and ethylbenzene of 9.8%,0.3%,and 0.3%,respectively.