Study On The Preparation Process Of Bio-aviation Fuel And High-value Chemicals By Efficient Use Of Oil And Grease

Bio-aviation fuel is a kind of fuel produced from biomass feedstock,which conforms to the use standard of aircraft.Bio-aviation fuel is a potential alternative to petroleum-based jet fuel.The bio-aviation fuel preparation process is a method that uses biomass such as non-edible vegetable oil,agricultural and forestry waste,waste oil from industry and catering industry to turn into green renewable aviation fuel.The development of bio-aviation fuel can not only alleviate the dependence on limited fossil resources,but also reduce the negative impact of the use of fuel on the environment.The use of industrial by-product oils or waste oils to synthesize bio-aviation fuel can also achieve resource recycling and reuse,improving utilization and economic benefits.In order to make efficient use of oil and grease as raw materials for the preparation of bio-aviation fuel,the key to the research is the selection of suitable raw materials and the design and study of relevant processes for the appropriate raw materials.In this paper,based on the characteristics of the industrial by-product tall oil,two kinds of structural substances as raw materials for the preparation of bio-aviation fuel are studied,namely monounsaturated fatty acid and tricyclic abietic acid.The fatty acid content of tall oil is mainly monounsaturated fatty acids.In this paper,an experimental study was conducted on the conversion of monounsaturated fatty acids into hydrocarbon products and related valuable chemicals in the range of bio-aviation fuel through the combined process of olefin cross metathesis and hydrogenation reaction.During the process,the erucic acid raw material was cracked through the olefin cross-metathesis reaction,and then molecular sieve catalysts were used for hydrogenation to obtain α-olefins and bio-aviation fuel components.The catalyst obtained by adding the template agent polyether P123(x=0.001)during the preparation of Y molecular sieve has a regular structure and a regular arrangement of particles.Compared with the catalyst prepared by commercial Y molecular sieve,the content of biological aviation fuel is higher,with a content of 47.09%.Abietic acid is one of the main compositions of tall oil and rosin,it has a tricyclic molecular structure,which could be further modified into a branched saturated bicyclic substance with the process of hydro-creaking treatment.Branched decalin and its derivatives are main hydrocracking products from abietic acid,which are promising aviation fuel components since they owe high density,good thermal stability,and low freezing point.In this work,two routes for the target aviation fuel production with abietic acid as raw material were investigated,and their reaction conditions were optimized.Under the optimal conditions,target aviation fuel with a yield of 45.85%saturated bicyclic products was obtained through the route of hydrogenation-cracking process.Meanwhile,a yield of 42.21%was obtained with the route of cracking-hydrogenation process.The branched saturated bicyclic compounds obtained from both processes had excellent fuel properties.Especially,the pour point of the fuel was below-75℃,which makes the product could be potentially used as bio-aviation fuel in special areas,or as additive to improve low temperature performance of conventional bio-jet fuels.The research in this article provides a process reference for monounsaturated fatty acids,tricyclic abietic acid and their structural analogs for the synthesis of bio-aviation fuel and related high-value chemicals.