MVR evaporation and concentration process of NMMO solvent

A MVR evaporation and concentration process of an NMMO solvent includes a preheating part and an MVR evaporation and concentration system, wherein the preheating part includes a non-condensable gas preheating part and a condensed water preheating part, waste heat of the system is fully utilized without additionally supplemented heat energy, and the heat energy consumption is reduced; the MVR evaporation and concentration system includes a vacuum system utilizing secondary steam heating, evaporative concentration, secondary steam re-compression and independence, can reasonably utilize the effective temperature difference of the system to reduce energy consumption, and can also ensure the stable operation of the system. The process adopts an MVR evaporation and concentration mode, greatly reduces the energy consumption, reduces the operation costs and can also meet the high-vacuum requirement of the system.