工艺条件对费-托合成蜡加氢裂化催化剂性能的影响

EFFECT OF PROCESS CONDITIONS ON PERFORMANCE OF FISCHER-TROPSCH WAX HYDROCRACKING CATALYST

采用等体积浸渍法,制备了以USY-Al_2O_3为载体、Ni-W为金属组分的加氢裂化催化剂,并用X-射线衍射、吡啶吸附红外漫反射光谱、低温N_2吸附-脱附等对催化剂进行表征。利用单因素变量法,分别考察了温度、空速、氢油比以及压力等工艺条件对费-托合成蜡加氢裂化反应性能的影响。结果表明,工艺条件对催化剂反应性能的影响强度由大到小的顺序为温度>空速>氢油比>压力,在温度340℃、质量空速1.5h^(-1)、氢油体积比1 000、压力4 MPa的条件下,转化效果最佳,重质蜡转化率高达98.11%,轻质燃料油选择性为92.77%,裂解气选择性仅为7.23%。

The hydrocracking catalysts were prepared by loading Ni-W onto USY-Al2O3carrier through incipience wetness impregnation method and characterized by X-ray diffraction,infrared diffuse reflectance-pyridine adsorption and low temperature nitrogen adsorption desorption techniques.The effects of temperature,space velocity,hydrogen-oil ratio,and pressure on the hydrocracking performance of Fischer-Tropsch waxes were investigated by the single-factor variable method.The results showed that the influence of operating conditions changes as orders:temperature>space velocity>hydrogen oil volume ratio>pressure.At the optimized conditions of a temperature of340℃,a pressure of4MPa,a mass space velocity of1.5h^-1,a hydrogen to oil volume ratio of1000,the conversion is the best.The conversion rate of heavy wax oil is as high as98.11%,light oil yield reaches93.5%,and the yield of cracked gas is only6.5%.