Abstract: New-vst Plus trays have been successfully used in the technical transformation of MAL dewatering column in the MMA industry. In the case of the original column shell, only using New-vst Plus trays to replace the original packing, the long-standing problem of blocking in the column has been successfully solved. After transformation, the operating indicators are normal, the water content of the column bottom is less than 0.02 wt%, the whole column pressure drop is maintained within 10 kPa. The technical transformation not only brings economic benefits for manufacturers, but also provides a new way to other process of internal transformation in easy polymerizing system. It has a broad application prospect.