The utility model discloses a
methanol rectification
system capable of improving
methanol yield, which is characterized by comprising a crude
methanol preheater, a pre-rectification
tower, a pre-prognosis methanol pump, a pressurizing
tower inlet preheater, a pressurizing
tower, an atmospheric tower, an atmospheric tower condenser, an atmospheric tower
reflux tank, an atmospheric tower product cooler and a methanol
storage tank, and the
cold medium outlet of the pressurizing tower inlet preheater is also communicated with the feeding hole of the atmospheric tower through a pipeline. The method has the advantages that in the start-up process, tower bottoms in the pre-rectifying tower are heated by the tower inlet preheater of the pressurizing tower and are supplied to the pressurizing tower and the atmospheric tower respectively, so that the time required for establishing the liquid level of the atmospheric tower can be shortened, the start-up time of the
system is shortened, the output time of refined methanol is prolonged, and finally the yield of methanol is increased; the heat carried by the steam discharged from the top of the pressurizing tower can be recycled, and the methanol carried by the steam can be recovered, so that the yield of the methanol is increased.