Mild hydrocracking process can give the diesel/gasoline ratio new flexibility for refinery.The effect of the operating conditions of hydrogen partial pressure,LHSV and H2/oil on the product properties were tested.Results indicated that at the same conversion,the qualities of the wax oil and diesel fractions are all improved and the high content of the mono-aromatic is easy to react when the hydrogen partial pressure increased;when the content of single cyclic aromatic hydrocarbons with different carbon number is consistent,the aromatic with lower carbon number is more likely to react as the hydrogen partial pressure increases,while the distribution changes of the carbon number of naphthene and chain alkane are small with the hydrogen partial pressure variation.Increasing LHSV,little changes of the product qualities are observed at the same conversion.At higher LHSV,the maximum carbon number of each hydrocarbon in wax oil is higher significantly than that at lower LHSV;At the same conversion,increasing H2/oil can only cause small quality changes,higher H2/oil ratio gives higher peak of carbon number than that at lower ratios.It is recognized that at the same conversion,higher partial pressure of H2 is helpful to produce high quality diesel blending component and wax oil product,while higher H2/oil and LHSV are benefit to the production of wax oil with higher carbon number,which can be used as feed for FCC or catalytic cracking process.%为了利用蜡油缓和加氢裂化工艺灵活调节炼油厂的柴汽比,考察了反应氢分压、空速及氢油比对缓和加氢裂化蜡油及柴油产品性质的影响.结果表明:在相同转化率下提高氢分压时,蜡油及柴油产品性质均改善显著,且含量较高的单环芳烃较易发生反应,碳数较低的单环芳烃随氢分压进一步提高较易发生反应,环烷烃及链烷烃碳数分布随氢分压的变化较小;在相同转化率下提高空速时,蜡油及柴油产品性质变化较小,高空速条件下,蜡油产品各烃类碳数分布的峰值显著高于低空速的蜡油产品;在相同转化率下提高氢油比时,蜡油和柴油产品性质变化较小,高氢油比条件下,蜡油产品各烃类碳数分布峰值高于低氢油比条件下的蜡油产品.因此,在相同转化率条件下,高的氢分压有利于生产优质柴油调合组分及蜡油产品,高氢油比和高空速有利于生产碳数较高的蜡油产品,可作为优质的催化裂化或催化裂解原料.
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