由C^＋9重芳烃制取轻芳烃

Preparing light aromatic hydrocarbons from C￣+_9heavy aromatic hydrocarbons

国外由重芳烃制取苯等轻芳烃有多种方法，其中由重芳烃热脱烷基和催化加氢脱烷基制苯的方法比较成熟。正在开发的工艺还有重芳烃加氢裂解或非临氢裂解制取Ｃ＿６～Ｃ＿８的轻芳烃以及水蒸气转化法制苯等过程。我国Ｃ＿９重芳烃产量逐年增加，而轻芳烃供需矛盾日益加剧，故应重视由Ｃ＿９重芳烃制取轻芳烃的研究开发工作。

Therp are many ways to prepare light aromatic hvdrocarbons such as benzene from heavy aromatic hydrocarbons in foreign countries, among which pro-cesses of the preparation of benzene by thermal and catalytlc hydredealkylation of heavy aromatic hydrocarbons have been well-developed,Meanwhile,the prepation of C_6～C_8 light aromatic hYdrocarbons by drocracking and non-hydrocracking processes and that of benzene by steam reforming process is being made. In China,however,the output of heavy aromatic hydrocarbons is increased annually with the short supply of light aromatic hydrocarbons. As a result, it should be taken seriously the research and development of preparation of light aromatic hydrocarbens form heavy aromatic hy-drocarbons.