利用孔径均一催化剂测定加氢脱硫条件下重油分子的有效扩散系数  

Effective Diffusivity of Residue Oil in Well-Defined and Uniform Pore-Structure Catalyst under HDS Reaction Condition

作　　者：王志刚[1] 裴嘉宁 陈胜利[1] 蔡奇[1] 薛扬[1] 娄亚峰[1] 

机构地区：[1]中国石油大学(北京)重质油加工国家重点实验室,北京102249

出　　处：《高校化学工程学报》2014年第6期1190-1197,共8页Journal of Chemical Engineering of Chinese Universities

基　　金：国家自然科学基金(21376260);中石化上海石化分公司(30450127-13-ZC0607-0001)

摘　　要：采用反应-动力学法测定了加氢条件下风城减压渣油超临界萃取窄馏分在四种孔径均一催化剂（WDUPS）中的有效扩散系数.结果表明：在400℃,6.0 MPa下,重油分子在催化剂孔道中的扩散系数的数量级在10-9～10-8 cm2·s-1.随着馏分变重,各馏分的有效扩散系数均逐渐降低;随着催化剂孑孔径增加各馏分的有效扩散系数逐渐增加,但当孔径大于48 nm后,有效扩散系数基本不受孔径影响.受限扩散因子的计算结果表明,相比轻馏分,重馏分在催化剂孔道中的扩散更容易受到催化剂孔径的限制.In this study, the effective diffusivities of Feng Cheng vacuum residue narrow cuts, obtained by supercritical fluid extraction and fractionation, were measured by kinetic method over four kinds of well-defined and uniform pore-structure （WDUPS） catalysts under hydrotreating reaction conditions. The results show that the order of magnitude of effective diffusivities of residue oil molecules is in the range of 10-9- 10-8 cm2.s-1. The effective diffusivities of residue oil increase with the decrease of the molecular weight of the residue and the increase of catalyst pore size. In addition, the effective diffusivities of various narrow cuts of residue oil keep almost unchanged when the pore size of catalyst particles is large enough. The calculated restrictive diffusion factor indicates that the diffusion of heavy fraction is more severely hindered than that of light fraction.

关 键 词：渣油 孔径均一催化剂 扩散系数 受限扩散 加氢脱硫 

分 类 号：TQ027.36[化学工程]