Synthesis And Characterization Of Advanced Alpha Olefin

Higher alpha olefin is an important and general organic chemical raw materials. It can bewidely used as comonomer, surfactant intermediates and oil additivities. Higher fatty alcoholsare mainly divided into natural alcohol and synthesized alcohol. Higher fatty alcohols whichare obtained by natural oils are inartificial and reproducible, its market storage capacity ismore. Therefore, natural fatty alcohol is used as raw material for producing higher alpha olefin,it can not only meet the lager demand of the market for higher alpha olefin, at the same time,the technological is more accord with the requirement of green chemical industry.The process production of1-octene and dodecene based on1-octyl alcohol and laurylalcohol as raw materials are studied in the fixed bed reactor with solid acid catalysts (modifiedγ-Al2O3) in the paper. In order to improve the catalytic performance and get high selectivity ofalpha olefin, preparation conditions and modification methods of γ-Al2O3are investigated.Dehydration catalyst of γ-Al2O3can be prepared by calcining aluminium hydroxide. Thebest roasting temperature is550℃and the best roasting time is5h. Si, Ti and Sn electrongroups are introduced by immersion method, ultrasonic immersion method and sol-gel method.In order to determine the catalytic properties of γ-Al2O3modified by different materials, theperformances of catalyst are characted by FT-IR, TG-DTA, XRD, SEM, LPAand BET.The synthesis of1-octene is based on1-octanol as raw materials and produced bycatalytic dehydration. The process is simple and easy to operate. The appropriate reactionconditions as follows: reaction temperature is340℃; space velocity is2.5h-1; volume flow rateis0.100mL/min; carrier gas (N2) volume flow is10mL/min; the catalyst is Si modifiedγ-Al2O3by ultrasonic immersion method. The highest1-octene yield more than90%, and the1-octanol conversion more than99%.Using dodecanol as raw materials and select dodecylbenzene as high boiling pointsolvent to produce dodecene is the first technology on using natural fat primary alcohol as rawmaterial to make higher alpha olefins. The appropriate reaction conditions as follows: reactiontemperature is360℃; space velocity is2.5h-1; volume flow rate is0.100mL/min; carrier gas(N2) volume flow is10mL/min; the catalyst is Si modified γ-Al2O3by ultrasonic immersionmethod. The highest dodecene yield as high as85%, dodecanol conversion more than95%. Natural higher alpha olefin can be produced by catalytic dehydration from higher fattyalcohols. The product of this process has high yield. The process also has many advantagessuch as easy obtainment of the raw materials, and the materials are natural, low cost andenvironmental friendly. It not only makes full use of the natural resources, but also meets theneeds of the market. This technology will surely become an inevitable trend of green chemicalindustry.