Ultra-deep desulfurization of coker and straight-run gas oils: Effect of lowering feedstock 95% boiling point
Ultra-deep desulfurization of coker and straight-run gas oils: Effect of lowering feedstock 95% boiling point
复制标题
DOI：
10.1016/j.fuproc.2006.10.008
复制
发表时间：
2007-03
影响因子：
7.5
通讯作者：
A. Al-Barood;A. Stanislaus
中科院分区：
文献类型：
--
作者：
A. Al-Barood;A. Stanislaus
近年来，通过柴油原料深度脱硫生产超低硫柴油在炼油厂中受到了相当大的重视。粗柴油原料的类型及其蒸馏温度在深度脱硫过程中起着关键作用。在本研究项目中，研究了降低两种粗柴油原料（即直馏粗柴油（SRGO）和焦化粗柴油（CGO））的95%蒸馏温度（T95）对深度脱硫至超低硫水平的影响。结果表明，对于两种类型的进料，通过将 T95 从 >360 °C 降低至 <340 °C，可以实现更高程度的脱硫。沸点高于 320 °C 的难熔烷基二苯并噻吩在低沸点馏分中以非常低的浓度存在，并且在低严酷的操作条件下实现了深度 HDS 至超低硫水平 (<50 ppm)。两种进料中，氮含量高、位阻烷基DBT浓度高、芳烃含量高（进料饱和度低）的CGO比SRGO更难脱硫。
Production of diesel fuels with ultra-low-sulfur levels by deep desulfurization of gas oil feeds has received considerable importance in the petroleum refineries in recent years. The type of the gas oil feed and its distillation temperature play a key role in the deep desulfurization process. In the present research project, the effect of lowering the 95% distillation temperature (T95) of two gas oil feeds, namely, straight-run gas oil (SRGO) and coker gas oil (CGO), on deep desulfurization to ultra-low-sulfur levels was investigated. The results showed that for both types of feeds a higher degree of desulfurization was achieved with reduction of T95from >360 °C to <340 °C. The refractory alkyl dibenzothiophenes boiling above 320 °C were present in very low concentrations in the low-boiling cuts and deep HDS to ultra-low-sulfur levels (<50 ppm) was achieved at low severity operating conditions. Among the two feeds, the CGO that contained high nitrogen content, high concentrations of sterically hindered alkyl DBTs and high aromatics content (low feed saturation) was more difficult to desulfurize than SRGO.