氢气在柴油中溶解度的测定与模拟计算

摘要

为了减少有害物质的排放和改善空气质量，许多国家把柴油中硫含量降到超低水平。液相循环加氢技术是柴油超深度脱硫的一种新工艺，其优点是依靠油品或溶剂中溶解的氢来参与原料的加氢反应。在这一过程中，氢气在柴油中的溶解度起着关键作用。本文采用实验测定和 Aspen Plus模拟运算两种方法，分别选用温度323～623 K和压力2～10 MPa的实验条件，研究了氢在不同型号柴油中的溶解度，得出了氢在不同型号柴油中的溶解度数据及溶解规律。实验条件下，氢气在0#柴油、直馏柴油、焦化柴油和催化柴油中溶解度大小顺序为：0#柴油>直馏柴油>焦化柴油>催化柴油；氢气在柴油中的溶解规律为随着温度和压力的增大而增大。研究结果可为柴油的液相循环加氢工艺操作参数的确定提供依据。%Sulfur content in diesel has been restricted to ultra low levels in many countries with the aim of reducing harmful emissions and improving air quality. As a novel technology for the diesel production with ultra low levels of sulfur,liquid phase hydroprocessing has caused more attention,in which,the oil is externally saturated with H2 in a presaturator and only the H2 saturated liquid oil is passed over the catalyst bed. So the hydrogen solubility plays an important role in the hydrotreating process. In this paper,the hydrogen solubility in different diesel samples was measured and simulated with Aspen Plus,at the temperature of 323~623 K and pressure of 2~10 MPa. The results show that the hydrogen solubility in the 0# diesel,straight-run diesel,coking diesel and catalytic diesel is in descending order. Moreover,the hydrogen solubility in all samples increases with the temperature and pressure. This investigation can provide useful information for the parameter optimization in the liquid phase hydroprocessing.