Research On Catalytic Cracking Oil By Supported Mesoporous Molecular Sieve

Bio-fuels,as one of best alternative petroleum diesel,are environment-friendly green fuel that has been far-reaching social and economic benefits.Compared the edible oil,the non-edible oil has been concerned due of the advantages of widely distributed,not compete with food,more environmentally friendly,available by-product and the obvious economic advantages.As one of the low cost feedstocks and the inedible vegetable oils for reducing the dependency on edible oil to make bio-fuels,it is an inevitable trend that searched some non-edible seed oil instead of the traditional edible vegetable oil as biodiesel raw material.This paper investigated on the catalytic cracking reaction of soybean oil,Cornus wisoniana oil and waste oil,and components of pyrolysis product preliminary studied by using Gas chromatography-mass spectrometry(GC-MS).Firstly,soybean oil as a raw material,and selecting cracking catalyst and it be modified,and the composition of pyrolysis products and physical and chemical properties were analyzed.The results showed a high liquid pyrolysis products from cracking soybean oil was obtained by three catalysts,such as Na₂CO₃,La SBA-15 and SO₄^2-/Al MCM-41.in which La SBA-15 is a catalyst obtained the highest yield of 85.3%for liquid pyrolysis products,in addition of the relatively low acid value of those.Those main liquid component concentrated was C₁₂-C₁₇,most similar to petroleum diesel.La SBA-15had better selectivity for composition of soybean oil.The cracking reactions of soybean oil were investigated by using different reaction devices.The results showed that modified simple cracking system(MC)reactor can deepen secondary cracking,and effectively decrease acid value.It also can make the composition pyrolysis of products and performance closer to petroleum diesel.In this study,response surface methodology was applied to optimize on the percentages catalyst,cracking temperature and cracking time in using simple cracking system(SC)as a reactor and La SBA-15 as a catalyst.A central composite design was used to develop the quadratic model that was subsequently optimized and the optimal conditions were as follows:the percentages catalyst 1.07wt%,cracking temperature485?and there was84.15%conversion in 53 min.There is a positive correlation between yields of biofuels and the dosage of cracking catalyst,the cracking temperature and cracking time,the cracking temperature and cracking time interaction was significant.This paper also investegated catalytic cracking reaction of boybean oil,Cornus wisoniana oil and waste oil by using La SBA-15 as a catalyst.The results showed that:the main component of pyrolysis products obtained were alkanes,alkenes,aromatics,carboxylic acids,ketones and alcohols and other organic compounds.The distilled light fraction obtained mainly was C₄-C₁₄,and the heavy fraction mainly was C₆-C₃₀.The SC reaction apparatus can get a better yield of pyrolysis products;there was a small number of acids exist using the MC reaction apparatus.Therefore,it is obvious that MC reaction apparatus not only promoted the secondary cracking process and made the fatty acid decomposited to hydrocarbons,but also has wide applicability to materials.