Study On Technology Of Combing Methanol MTO With FCC Gasoline Olefine-Reducing

Based on MTO (methanol to olefin) technology and FCC (fluid catalytic cracking) gasoline olefin-reducing technology, combining technology of refining methanol with FCC gasoline was studied because of the consistency and complementary in the catalyst and reaction conditions. The reaction mechanism was the carbeniumion mechanism. Because of MTO reaction process exothermic and FCC reaction process endothermic, the combining technology reaction heat had complementary and formed useful chemical dilution effect. The is to achieve the and. Refining methanol with FCC gasoline can be expected to add the lower-olefin yield from MTO,FCC gasoline olefin-reducing and product gasoline yield, also was beneficial to control the side effects.Refining was carried out in a small-type riser reactor over the FCC catalyst. Effects of refining temperature, refining ratio and methanol feeding position on group composition of product gasoline,cracking gas composition and gasoline yield were investigated. Feeding methanol together with FCC gasoline brought on better results than other options. Refining methanol with FCC gasoline not only enhanced the upgrading of latter but also increased liquid yield to LPG (liquefied petroleum gas) and yield to liquid product. Under appropriate condition:refining temperature 400℃-420℃, refining ratio 5%-15% and m(catalyst):m(gasoline) 10-12, olefin mass fraction in FCC gasoline decreased from 45% to 21%-25%, yield to liquid product increased about 3%, dry gas mass fraction of cracking gas was less than 1.5% and total yield to refined gasoline and LPG reached more than 98%.In the fixed-bed micro-reactor, for the purpose of combination of methanol conversion process MTO and FCC gasoline modification progress, the modification progress of refining methanol with FCC gasoline were studied, using zeolitic catalysts as the combination catalyst. And temperature, space velocity, methanol/gasoline ratio were investigated. Main Effects of refining methanol with FCC gasoline were studied. The results showed that the conversion of methanol MTO on SAPO-34 catalyst had good results, the hydrogen transfer and aromatization of high-olefin content of gasoline on SAPO-34 catalyst were obvious; The appropriate mixing conditions were: reaction temperature 400℃, mixing ratio of 15%, the LHSV(gasoline)2.5h-1, the LHSV(methanol)1.6h-1, the FCC gasoline olefin content on combination of catalyst fell 23% from FCC gasoline.The reactions of FCC fraction, model compounds and single hydrocarbon were studied, reaction heat effect was calculated. Effect of catalyst character on refining reaction was considered. Reaction mechanism model through the analysis of reaction of FCC gasoline mixing with methanol was constructed as the reaction mechanisms involved. The results showed catalyst acid distribution was consistent with the complex reactions. Reaction heat showed the reaction process was exothermic and it reached heat balance when the refining ratio is 15%. MTO,FCC gasoline olefin-reducing and refining reaction process appeared the tendency from alkane to alkene. Hydrogen transfer reaction is the integration point of refining MTO with FCC gasoline olefin-reducing, there is a common network model of reaction mechanism.