邻苯基苯酚的工业化生产工艺

邻苯基苯酚的工业化生产工艺以环己酮为原料,在酸性催化剂作用下进行缩聚反应,反应过程中经带水剂脱水,得到二聚中间体2-(1-环己烯基)环己酮和2-环己亚烷基环己酮的混合物,采用高效精馏技术对二聚中间体进行分离提纯,并回收未完全反应的环己酮。提纯后的二聚体以氢气作为载气,进入固定床反应器进行催化脱氢反应,反应得到的产物经过高效精馏、重结晶、干燥及切片等单元操作,最终可以得到质量分数大于99.5%的成品邻苯基苯酚。

Industrial production technology of o-phenylphenol

The cyclohexanone was used as raw material in the industrial production technology of o-phenylphenol(OPP).The cyclohexanone was polycondensed in the presence of acid catalysts.In this reaction,water was removed by entrainer.The mixture of 2-(1-cyclohexenyl) cyclohexanone and 2-cyclohexyl alkylidene cyclohexanone was obtained through this reaction.The products were purified by high-efficiency distillation techniques,and the non-fully reacted cyclohexanone was recycled in the distillation process.After the purification,the dimers entered into the fixed-bed reactor with hydrogen as carrier gas,and the catalytic dehydrogenation reaction was carried out.The reaction products underwent the unit operations like high-efficiency distillation,recrystallization,drying and slicing.The mass fraction of finished product OPP can eventually achieve more than 99.5%.