Bio-Oil Model Compounds Co-Pyrolysis To Prepare Hydrocarbons

With the contradiction between supply and demand of petroleum resources and environmental pollution, more and more attention has been paid to the study of clean and renewable energy, especially converting bio-oil into biofuel. Due to the synergistic effect between substances, co-pyrolysis reaction can promot the quality of the product simply and effectively. So co-pyrolysis has been endowed with unique chemical application prospect. Guaiacol is selected as model compound of bio oil, HZSM-5 molecular sieve is selected as catalyst, co-pyrolysis reactions of guaiacol in specific conditions are studied systematically.The main research content and conclusions are as follows:(1) In order to explore the effect of the proportion of co-pyrolysis materials, taking butanol and guaiacol mixture as reactant. With the decrease of butanol guaiacol ratio, the content of water in oil phase increased, the carbon deposited on catalyst and the yield of hydrocarbons decreased. Compared with the contrast group, the quality of oil phase product improved by the co-pyrolysis reaction.(2) Through the sudy of the yield of target product, synergy coefficient of the co-pyrolysis reaction can be defined. When the ratio of guaiacol and butanol is 3:1; 2:1; 1:1; 1:2; 1:3, the synergy coefficient is 0.11; 0.29; 0.32; 0.39; 0.15 respectively. When the ratio of guaiacol and butanol is 1:2, the synergy coefficient reaches the highest value, in which guaiacol and butanol have the best synergistic effect.(3) In order to explore the effect of the water content in the reactant, with water content in the reactant increased, the carbon deposited on catalyst firstly increases and then decreases, the yield of hydrocarbons decreased, and the quality of oil phase decreased rapidly. Water content in the reactant has adverse effect on the reaction. When water content in the reactant is 0%; 10%; 20%; 30%; 40%, the synergy coefficient is 0.316; 0.188;-0.059;-0.149;-0.255, respectively. The water content in bio oil is 15%?30%, which will hamper bio-oil after modification.(4) In order to explore the effect of different kinds of co-pyrolysis materials, taking butanol, butanone, butyrate as co-pyrolysis materials. Butyrate group has the the highest water content in oil phase. Butanone group has the the highest calorific value of oil phase product. The oil phase product of butanol group has the best quality, which the water content is 0.91%, and the calorific value reaches 39.80MJ/kg. So butanol is the best co-pyrolysis material among them.(5) In order to explore the effect of different carbon number of co-pyrolysis materials, taking methanol?ethanol?propanol?n-butanol?n-pentanol?n-hexyl alcohol as co-pyrolysis material. With the increase of carbon number of co-pyrolysis alcohols, the yield of water decreased, carbon deposited on the catalysts and the oil quality gradually increased. The quality of oil phase product reaches best in n-pentanol group, in which the calorific value of oil phase is 40.8 MJ/kg, the water content is 1.4%. So n-pentanol is the best co-pvrolvsis material among them.