This passage introduced the process of pre - distillation column. Analyzed the main role of the pre- distiUation column in the methanol distillation, by controlling the non -condensable temperature, extraction of water, lye and other adjustment methods.%介绍了预精馏塔的工艺流程,通过控制不凝气温度、萃取水、碱液等几个调节方法,分析了预精馏塔在甲醇精馏中的主要作用。
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