费-托合成蜡加氢裂化工艺条件的研究

STUDY ON HYDROCRACKING PROCESS OF F-T WAX

通过单因素实验筛选影响费-托合成蜡加氢裂化深度的关键因素,在此基础上,采用中心复合实验设计考察各因素的单项、交互作用项以及平方项对费-托合成蜡加氢裂化转化率和中间馏分油(150～370℃)产率的影响,并调用MATLAB中的优化函数分析实验数据,确定最佳工艺条件。结果表明:在试验范围内,各因素对费-托合成蜡加氢裂化转化率影响从强到弱的顺序为:温度>液体空速>压力>氢蜡比;费-托合成蜡加氢裂化的转化率随温度升高、氢蜡比增加而增加,随压力增大、液体空速增加而减小;温度和压力的交互作用、液体空速和压力的交互作用对费-托合成蜡的裂化深度也有显著影响;确定的最佳工艺条件为温度377℃、压力5.0MPa、液体体积空速1.95h-1、氢蜡体积比820,在该条件下中间馏分油的产率达到66.3%。

It is very meaningful to optimize the hydrocracking process for obtaining high quality fuels from FT wax. After the main factors that have significant effect on the hydrocracking conversion of FT wax were determined through conditional experiment, the central composite design method was used to investigate the influence of single items, interaction items and square items of these major factors on the wax conversion and middle fraction content of products. In order to test the optimum operating conditions, full quadratic models describing the conversion of FT wax and the content of C10-22 fraction of the hydrocracking products were determined based on MATLAB. Results indicate that temperature has a significant effect on the wax conversion, followed by liquid space velocity, pressure and H2/Wax ratio; furthermore, temperature and H2/Wax ratio have a positive effect on the wax conversion while pressure and space velocity have an inverse relationship with conversion rate.The interaction items of temperature and pressure, space velocity and pressure also play a major role in the hydrocracking process.The middle fraction content may reach maximal value under the following conditions： 377 ℃, 5.0 MPa, 1.95 h-1 of WHSV, 820 V/V of H2/Wax ratio.