Device for rectifying and purifying m-nitrotoluene coarse products

The utility model discloses a device for rectifying and purifying m-nitrotoluene coarse products; the lower end of a rectifying column (2) is connected with a reboiler (1), the upper end of the rectifying column (2) is connected with a condenser (3), and the condenser (3) is connected with a material tank (9) through a return tank (4), a gas-liquid separator (5), a vacuum trap (6), a Roots vacuum pump (7) and a liquid ring type vacuum pump (8), the material tank (9) is connected with the rectifying column (2) by a material pump (10). The device is simple, convenient and safe to operate, has high vacuum degree, remarkably reduces the distilling temperature, effectively improves the separation efficiency, ensures the m-nitrotoluene product quality, reduces abrasion and high-temperature dangers of a high vacuum unit and reduces environment pollution.