Study On Preparation Biodiesel From Rosin Cracking By Acid-Modified FCC Spent Catalyst

Biodiesel from rosin were prepared by cracking method with rosin as raw material and acid-modified FCC spent catalyst as catalyst. The different influence factors in catalytic preparation and rosin cracking reaction were investigated. The optimum preparation process of acid-modified FCC waste catalyst and optimal reaction condition for preparation of rosin cracking were searched. The physicochemical properties of catalyst and cracking reaction product were characterized. The process of prepared Biodiesel was explored through mixing the rosin-based Biodiesel and0#petroleum diesel. It will provide technical support for renewable biomass rosin processing of Guang Xi and new way for resources regeneration of FCC spent catalyst.The acid modified FCC waste catalyst was prepared by the impregnation method. The influence factors in catalytic activity of acid modified FCC waste catalyst were investigated by Single-factor and orthogonal method. The optimum prepatation process of acid modified FCC waste catalyst obtained was: liquid-solid ratio4:1, concentration of hydrochloric acid12%(w%), activated temperature363K, activated time2h, agitator speed450r·min-1, drying temperature423K. The structures and physicochemical properties of catalyst in modification stage were characterized by SEM-EDS, BET, XRD, FI-IT, and so on. The results showed, after activation and acid modification, the catalyst remained its Y zeolite bone structure. The layer stripping phenomenon was obvious on the surface of the catalyst and the channel structure of the catalyst was improved. The specific surface area and pore volume were increased. Ca, Fe, Ni ion content were reduced. After reaction, the fine structure of catalyst was not destroyed. The specific surface of particle, the number of acidic sites and the reaction activation of catalyst were decreased as a result of carbon deposition.According to Single-factor, the influence of reaction temperature, reaction time and dosage of catalyst in weight of resin on the cracking reaction were studied. The optimum conditions were confirmed, which are reaction temperature553K, reaction time2h, dosage of catalyst15%. In this condition, the acid value of rosin-based Biodiesel of was0.64mgKOH-g-1。Gas chromatography(GC) and gas chromatography-mass spectroscopy(GC-MS) were developed to determine the structures and composition of the products.The results showed that, this products consisted of two parts, the essential oil and the rosin-based Biodiesel. In the essential oil, the main components were olefins, naphthalene, carboxylic acid, luxuriant, aromatic hydrocarbon and ketone, which their relative contents were31.54%,26.94%,9.64%,9.08%,6.85%and6.85%. In the rosin-based Biodiesel, the main components were luxuriant, naphthalene and ketone, which their relative contents were42.3%,23.64%and16.82%.The physical and chemical properties of rosin-based Biodiesel and blend oil were also analyzed with national standard. The results showed that, the most physical and chemical properties of rosin-based Biodiesel (B100) can approach the requirements of GB/T20828-2007national standards, the physical and chemical properties of the rosin-based Biodiesel blend oil (B5) satistied the requirements of GB/T25199-2010biodiese fuel blend (B5).