Farag Hamdy
Department of Material Process Engineering, Graduate School of Engineering, Kyushu University, Motooka 744, Fukuoka 819-0395, Japan.
J Colloid Interface Sci. 2007 Mar 1;307(1):1-8. doi: 10.1016/j.jcis.2006.11.024. Epub 2006 Nov 22.
Adsorption technique could be a reliable alternative in removing to a certain remarkable extent the sulfur species from the feedstock of petroleum oil. The performance of various carbons on adsorption of model sulfur compounds in a simulated feed solution and the sulfur containing compounds in the real gas oil was evaluated. The adsorption experiments have been carried out in a batch scale at ambient temperature and under the atmospheric pressure. In general, the most refractory sulfur compounds in the hydrotreatment reactions were selectively removed and adsorbed. It was found that the adsorbents affinities to dibenzothiophene and 4,6-dimethyldibenzothiophene were much more favored and pronounced than the aromatic matrices like fluorene, 1-methylnaphthalene and 9-methylanthracene. Among the sulfur species, 4,6-dimethyldibenzothiophene was the highest to be removed in terms of both selectivity and capacity over all the present adsorbents. The studied adsorbents showed significant capacities for the polyaromatic thiophenes. The electronic characteristics seem to play a certain role in such behavior. Regeneration of the used adsorbent was successfully attained either by washing it with toluene or by the release of the adsorbates through heat treatment. A suggested adsorptive removal process of sulfur compounds from petroleum distillate over carbon supported CoMo catalyst was discussed.
吸附技术在从石油原料中去除一定程度的硫物种方面可能是一种可靠的替代方法。评估了各种碳对模拟进料溶液中模型硫化合物以及实际瓦斯油中含硫化合物的吸附性能。吸附实验在常温常压下以间歇方式进行。一般来说，加氢处理反应中最难处理的硫化合物被选择性地去除和吸附。发现吸附剂对二苯并噻吩和4,6-二甲基二苯并噻吩的亲和力比芴、1-甲基萘和9-甲基蒽等芳烃基质更有利且更明显。在所有硫物种中，就选择性和容量而言，4,6-二甲基二苯并噻吩在所有现有吸附剂中去除率最高。所研究的吸附剂对多芳基噻吩具有显著的吸附容量。电子特性似乎在这种行为中起一定作用。通过用甲苯洗涤或通过热处理释放吸附质成功实现了用过的吸附剂的再生。讨论了一种在碳负载的CoMo催化剂上从石油馏分中吸附去除硫化合物的建议工艺。
