磷酸活化褐煤半焦用于柴油吸附脱硫的研究

采用磷酸活化褐煤半焦为载体,负载多种金属氧化物制备了催化裂化(FCC)柴油吸附脱硫剂。煅烧温度、载样种类、浸渍比、煅烧时间和浸渍时间等因素都会对脱硫剂的性能产生显著的影响,按正交实验设计方法,采用FCC柴油为原料,考察了这5种因素对脱硫活性的影响。结果表明,半焦载体的煅烧温度对于脱硫活性的影响最为显著,最佳的煅烧温度为700℃,其他影响因素依次为:载样种类CuO、浸渍比1.5∶1、煅烧时间1.5 h和浸渍时间20 h。实验还考察了采用最佳制备条件得到的吸附脱硫剂在空速为2 h-1和120℃条件下的脱硫性能,并对其失活样品在350℃进行水蒸气再生。结果表明,无论是新鲜脱硫剂还是再生样品,其脱硫率都随脱硫时间的延长而下降,且再生后脱硫剂脱硫效果明显下降。

Desulfurization of diesel oil by adsorption over H3PO4 modified lignite semi-cokes

One kind of desulfurizer for FCC diesel oil was prepared with semi-coke modified by phosphoric acid.Some factors,such as calcination temperature,metal loading species,dipping ratio,calcination time and dipping time,etc.,could influence the activity of desulfurizer remarkably.All of those were investigated carefully by orthogonal experiment.The results show that the calcination temperature of semi-coke has the most notable effect on desulfurizer activity and the optimal calcination temperature is 700 ℃.The other factors are in turn the metal loading species(CuO),the dipping ratio(1.5∶1),the calcination time(1.5 h) and the dipping time(20 h).The desulfurization ability of this desulfurizer prepared under the optimal conditions was studied at space velocity of 2 h-1 and 120 ℃,which was regenerated at 350 ℃ by stream after it was deactivated.The results indicate that the sulfur removal conversion drops with the extending of desulfurization operation time no matter it is the fresh desulfurizer or regenerative samples,and the regenerative ones have obviously low activity.