Preparation of aromatic hydrocarbons by reforming naphtha fraction from Shenfu direct coal liquefaction oil
Huang Peng
Abstract：Naphtha fraction (＜200 ℃) from direct coal liquefaction (DCL) oil possessing high proportion of aromatic hydrocarbon is a potential feedstock to prepare aromatic hydrocarbons.The naphtha from the light fraction(＜200 ℃) after sulrry-bed hydrocraking was used as the raw material.Primarily,the sulfur and nitrogen in raw material wcre reduced to less than 1 mg/kg by hydrorefining to meet the requirement of hydrorefoming.Subsequentially,hydroreforming experiments were carried out on a bench-scale fixed-bed continuous flow reactor for preparation of aromatics.The changes of group components and the yields of main aromatic compounds were investigated.Results show that n-alkane isomerization reaction is dominating during the hydroreforming process,that is,the naphthenics are converted to aromatics via dehydrogenation and aromatization.The naphtha fraction from DCL oil is available for catalytic reforming with C1-C4 hydrocarbon and hydrogen yield of 6.03％ and 3.6％,respectively.The content of aromatic hydrocarbons reaches to 83.2％ after reforming,and which contain 61.3 ％ of C6 C8 aromatics hydrocarbon.It is considered be feasible resources to extract BTX.To some extent,the yield of the aromatic hydrocarbons is influenced by the distillation range of naphtha.Roughly,the 60-160 ℃ is an appropriate range in this study.
Keywords：direct coal liquefaction oilnaphthaaromatic hydrocarboncatalytic reforming
Publication Date：2017-01-01