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℃。 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 were 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 C_1-C_4 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 C_6-C_8 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