| 摘要 |
PURPOSE: To provide a method for producing methylamine capable of retaining for a long time the activity of the catalyst in the main reaction vessel and of continuing the continuous operation stably. CONSTITUTION: The reaction product from a reaction vessel 1 to produce the objective methylamine chiefly from ammonia and methanol in the presence of a solid acid catalyst is distilled, and the whole amount of the vapor taken from the top of the distillation column 3 is condensed in a condenser 5 followed by circulating part of the condensate via a vaporizer to the reaction vessel. In this method for producing the methylamine, part of the vapor 4 from the top of the distillation column is circulated as it is and the rest is condensed in the condenser and returned to the distillation column; or, part of the vapor is condensed in the condenser and the resultant vapor phase is circulated to the reaction vessel while the liquid phase is returned to the distillation column. |
