【摘要】 生物油与石油馏分共炼制被认为是一种具有规模化应用前景的生物油精制方法。生物油共炼制过程不仅与原料和反应条件有关,同时也受到内扩散的影响。文章采用固定床反应器研究生物油与石蜡油的共炼制,考察了温度、质量空速以及催化剂的粒径对共炼制反应的影响,同时引入效率因子衡量内扩散对共炼制过程的影响。通过实验发现:共炼制的最佳反应温度为793 K,此时液体收率最高为85%;较小的质量空速有利于裂解反应进行,因此焦炭及气体产率增加;随着质量空速的增大,液体收率增加,但质量空速过大会导致停留时间短而反应不完全;催化剂粒径越大,液体收率越小。文章基于反应动力学参数以及气固催化理论,提出了内扩散效率因子的计算方法,计算效率因子与实验效率因子的相对偏差小于4%,表明该方法可以用于定量评估共炼制过程中内扩散的影响程度。更多还原

【Abstract】 Co-processing of bio-oil and petroleum fraction is considered as a promising bio-oil upgrading method for large-scale utilization of bio-oil. The co-processing process is influenced by the feed and the reaction conditions as well as the transfer process. In this article, co-processing of bio-oil and paraffin oil was carried out in a fixed bed reactor. The effect of temperature, WHSV and catalyst particle size on the process was investigated, and the effectiveness factor was introduced to estimate the effect of internal diffusion on the co-processing process. According to the experimental results, the optimal reaction temperature was 793 K, at which the liquid yield was 85%. Low WHSV could promote the cracking process and increase the coke and gas yields. With the increase of WHSV the liquid yield increased, however, short retention time might lead to the incomplete conversion of the feed. And with the increase of catalyst particle size the liquid yield decreased. Based on the kinetic parameters and gas-solid catalysis theory, a method for calculating the effectiveness factor was proposed. The relative error between calculated effectiveness factor and experimental effectiveness factor was less than 4%,which proved that this method can be used to estimate the effect of internal diffusion on the co-processing process quantitatively.更多还原