PVA produces by -product acetic acid methyl ester and rectification full gear system for acetaldehyde

The utility model provides a PVA produces by -product acetic acid methyl ester and rectification full gear system for acetaldehyde, includes rectifying column, reboiler, condenser, distributor, the groove of distilling off, the pump of distilling off, acetaldehyde storage tank, still sets up first trip valve between the liquid phase backward flow of the backward flow mouth of distributor and rectifying column mouthful, sets up the second governing valve at the oil production port of distributor between the groove with distilling off, still distilling off the pump and set up second backward flow connecting line between the first backward flow connecting line to to distil off the liquid phase material of inslot through the power of the pump of distilling off mouthful forces to flow back to the rectifying column in from the backward flow of the liquid phase of rectifying column, the rectification piece -rate system still includes temperature automatic control device, the utility model discloses in, adopting the