Methylamine and NMP production tail gas treatment method

The invention relates to the technical field of tail gas treatment in the methylamine and NMP production process, in particular to a methylamine and NMP production tail gas treatment method. The tail gas containing methylamine, tetrahydrofuran and incompletely reacted butanol can be sequentially subjected to acid pickling neutralization, removal and absorption of alkaline substances, filtration and adsorption and the like by adopting a composite treatment process of an acidic spraying absorption tower, a recovered wastewater spraying absorption tower and a gas-liquid separation tower; compared with the prior art, the method has the advantages that the removal and absorption effects of alkaline substances in the tail gas can be obviously improved, water-soluble impurities, moisture and trace pollution factors in the tail gas can be effectively removed, the conditions of large peculiar smell of a discharge outlet and heavy ammonia smell of a working area are avoided, the tail gas treatment effect is obvious, an