神府煤液化油石脑油馏分重整生产芳烃的研究

由于煤液化油石脑油馏分(200℃)中芳烃潜含量较高,利用煤液化油石脑油馏分为原料,进行加氢精制,将原料中的硫氮含量降至1 mg/kg左右,满足重整进料要求,然后在小型固定床连续反应器上进行加氢重整生产芳烃试验。着重考察重整反应前、后族组成的变化及主要芳烃化合物的产率。结果表明,加氢重整过程中发生正构烷烃异构化反应;环烷烃主要发生脱氢芳构化反应转化为芳香烃;煤液化油石脑油馏分适宜进行催化重整,C_1~C_4烃气产率6.03%,氢气产率3.60%;重整后,芳烃含量达83.20%,其中C_6~C_8芳烃含量61.03%,是提取BTX的良好原料。石脑油的馏程对芳烃的组成和产率有一定影响,适宜的馏程为60~160℃。

Preparation of aromatic hydrocarbons by reforming naphtha fraction from Shenfu direct coal liquefaction oil

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.