Abstract:

The alkylation route of naphthalene and isopropanol was used to investigate the effects of catalytic performance and reaction conditions of the modified molecular sieve on the isopropylation reaction.Using molecular sieve as carrier,HM(H-SAPO-11 and HZSM-5) zeolite catalysts supported on FeCl₃ were prepared by ion exchange method.The above catalysts were characterized by means of X-ray diffraction（XRD）,scanning electron microscope/energy dispersion spectrometer (SEM/EDS）,Brunauer-Emmett-Teller（BET）,Fourier transform infrared spectroscopy（FT-IR）.The effects of catalytic properties and reaction conditions of modified molecular sieve on isopropylation of naphthalene were carried out with fixed-bed flow microreactor.The conversion of naphthalene increased substantially with the increase of FeCl₃ on HM loading from 10% to 50%(mass fraction).The ratio of raw materials was[n(naphthalene)∶n(isopropanol)∶n(cyclohexane)=1∶2∶10],the mass of the catalyst was 2 g,the mass space velocity was 1 h^-1,and the reaction temperature was 280 ℃. Under the conditions,for the 50% Fe/HM,the conversion of naphthalene reached 61.4%,the yield of 2,6-DIPN was 38.4% and the selectivity of β,β-DIPN was 84.6%.

Key words: molecular sieves, ferric chloride, isopropylation, fixed-bed flow microreactor