Research On Copolymerization Of Mixed Olefin-maleic Anhydride And Olefin Reduction Of Gasoline

As the main light petroleum product of petrochemical industry,gasoline is made by fractionation of crude oil and splitting of heavy distillation,which is mainly composed of C4-C12 olefins,alkanes and aromatic hydrocarbons.After reducing olefins and increasing octane,gasoline is mainly used as fuel for engines.In this paper,a novel technology for olefin reduction in gasoline is developed based on self-stable precipitation polymerization of gasoline and maleic anhydride(MAH).The effects of various reaction parameters,including solvent,monomer feed ratio,monomer concentration and temperature,on the copolymerization behavior of gasoline-MAH and the reduction of olefins were investigated systematically.Based on the experimental results,the optimum reaction conditions are attained for the highest monomer conversion and the biggest reduction in olefin,and meanwhile polymer particles with relatively uniform particle size were successfully obtained.The specific research work is as follows:1.The olefin monomers in the unetherified gasoline and MAH were directly copolymerized by self-stable precipitation polymerization,and the influence of reaction conditions,including solvent,monomer feed ratio,monomer concentration,on the monomer conversion and olefin reduction rate were studied in detail.When the weight ratio of olefin monomer in gasoline:MAH is 10:7.5,the monomer concentration is 19 wt%,the initiator concentration is 3 wt%,and the reaction was carried out at 70? for 12 h,the monomer conversion and olefin reduction rate of the reaction system were the highest,reaching up to 72%and 60%,respectively.Meanwhile,the unetherified gasoline-maleic anhydride copolymer microspheres with a particle size of 2100 nm and particle size distribution of 1.02 were successfully obtained.2.The presence of nitrogen and sulfur compounds in the FCC gasoline would exhibit severe inhibition effects and black by-products was formed due to the reaction between nitrogen and sulfur compounds and MAH.To eliminate the reverse influence of the impurities,the FCC gasoline was purified and the pretreated FCC gasoline was copolymerized with MAH.The effects of various reaction parameters,including solvent,monomer feed ratio and monomer concentration,on the monomer conversion and olefin reduction rate were investigated in detail.The optimum reaction condition is:the weight ratio of olefin monomer in gasoline:MAH is 10:7.5,the monomer concentration is 19 wt%,the initiator concentration is 3 wt%.The copolymerization reaction was carried out at 70? for 12 h,the monomer conversion and olefin reduction rate of the reaction system reached up to 72%and 60%,respectively.And monodisperse copolymer microspheres with a diameter of 2000 nm were facilely obtained.