柴油电催化加氢与氧化脱硫的系统集成

Integrated process of electrochemical hydrogengation and electrooxidation of diesel oil

柴油中硫和多环芳烃含量要求越来越严,由于二苯并噻吩类硫化物的空间位阻导致传统的催化加氢难以实现以上目标。本文以泡沫铅为阴极,以石墨为阳极,在CH3CN+EtOH+H2O+Bu4NBr电解体系中可以将柴油中多环芳烃的电解加氢和含硫化合物的电解氧化脱除集成。在该电解体系中泡沫铅电极上柴油电解加氢主要是温和的加氢,电解加氢后氢含量增加了1.1%,三环芳烃蒽类和菲类减少3.3%,但是总芳烃含量变化不大,十六烷值增加3.9。在石墨阳极上柴油中硫化物容易电解氧化,氧化产物砜类不能完全由电解体系萃取脱除,进一步通过活性炭吸附可以将柴油硫含量由884μg.g-1降低至44μg.g-1。

Due to the future specifications for sulfur and polyaromatic content in diesel,the traditional hydrotreatment process was confronted with the difficulty to fulfill this target for the steric hindrance of polyaromatic sulfur compounds such as dibenzothiophene（DBT） and its derivatives,lead to their slow reactivity with catalysts.An alternative method for desulfurization was the oxidation and extraction removal of sulfur compounds,but the polyaromatic content remained the original content.A new integrated process was studied in which the electrochemical hydrogenation of polycyclic aromatics and electrooxidation of sulfur compounds in diesel oil could be integrated in CH3CN＋EtOH＋H2O＋Bu4NBr electrolysis system with spumous Pb as cathode and graphite as anode.The electrochemical hydrogenation was mild,the content of H for diesel increased 1.1%,the content of polycyclic aromatics decreased 3.3%,cetane increased 3.9.The sulfur compounds in diesel oil were oxidized,the sulphone compounds were not extracted into electrolysis system completely,further by adsorption with activated carbon,the sulfur content decrease from 884 μg·g-1 to 44 μg·g-1.