Method for removing quinoline in DMNO-3

The invention provides a method for removing quinoline in DMNO-3. The method comprises the following steps: mixing CMNO-1 and sulfuric acid, separating quinoline sulfate and acid CMNO-3, discharging the quinoline sulfate out of an interface region; performing a neutral reaction of acidic CMNO-3 and an alkali lye to obtain the CMNO-3; and performing desalination on the residual acidic CMNO-3. Compared with the current beta methylnaphthalene distillation production technology, through reconstruction of a system 93, problems of weak acidity of DMNO-3, high salt content, and difficult operation on a tower 94 can be solved, technology index of an intermediate product of company is satisfied, and a base is established for optimization operation of the tower 95. 本发明提供了种去除DMNO-3中喹啉的方法，其包括如下步骤：将CMNO-1与硫酸混合后，分离出硫酸喹啉和酸性CMNO-3，并将所述硫酸喹啉排除介区以外；将部分所述酸性CMNO-3与碱液进行中和反应，得到CMNO-3；将剩余所述酸性CMNO-3进行脱盐基处理。本发明的优点在于：与现有β甲基萘的蒸馏生产工艺相比，经过对93系统的改造，解决了DMNO-3偏酸性以及盐基含量高、不利于94塔操作的难题，满足了公司中间产品的工艺指标，同时也为95塔的优化操作奠定了基础。