Method for obtaining pure tert-butyl (meth) acrylate from crude tert-butyl (meth) acrylate by distillation

摘要

In a method for obtaining pure tert-butyl (meth) acrylate from crude tert-butyl (meth) acrylate by distillation, the method comprises the steps of: separating a partition wall column (1) having a separating internal structure and an evaporator (7); In the bulkhead tower (1), a bulkhead (8) is arranged along the longitudinal direction of the tower, and an upper tower common area (9), a lower tower common area (14), a side part Forming a feed section (10, 12) having a feed port (2) and a discharge section (11, 13) having a side discharge port (3), said tower having a theoretical plate number in the range of 20 to 80; Here, the number of theoretical plates of the partition tower (1) is based on the total number of theoretical plates in the upper column common region (9), the lower column common region (14), and the supply units (10, 12). , The crude tert-butyl (meth) acryl The side supply port (2) of the plate is a theoretical plate in a region starting from a theoretical plate at least two stages above the lowest theoretical plate and ending with at least two theoretical plates below the highest theoretical plate. And the side outlet (3) of the pure tert-butyl (meth) acrylate is at least two stages above the lowest theoretical plate and higher than the highest theoretical plate. Are also arranged in the theoretical plate in the region ending with at least two theoretical plates, and the partition (8) in the column is located at the top starting from the theoretical plate at least one stage above the lowest theoretical plate. In the region ending with at least one theoretical plate below the theoretical plate, where it goes to the enrichment section (10) and the recovery section (11) of the column at the upper end of the partition (8). The amount ratio of the liquid is in the range of 1: 0.2 to 1: 5. And setting the method.