Method for isolating pure t-butyl (meth) acrylate by distillation from crude t-butyl (meth) acrylate

摘要

The present invention relates to a process for obtaining pure t-butyl (meth) acrylate from crude t-butyl (meth) acrylate, which method comprises a split wall column (1) having a separating component and an evaporator (7). In this case, the dividing wall 8 is arranged in the column length direction in the dividing wall column, so that the upper joint column region 9, the lower joint column region 14, the side feed point (2) and an intake section (11, 13) having a side outlet point (3) and an intake section (2), wherein the column has a theoretical plate number in the range of 20 to 80 ( number of theoretical plates, the theoretical plate number of the partition wall column 1 refers to the sum of the theoretical plates in the joint upper column region 9, the joint lower column region 14 and the inlet zones 10, 12. Crude t-butyl (meth) acrylate The side feed point 2 for the trough is arranged in a theoretical plate in a region starting at at least two theoretical plates above the lowest theoretical plate and ending at at least two theoretical plates below the top theoretical plate, the pure t − The side discharge point 3 for butyl (meth) acrylate is arranged in a theoretical plate in an area starting at at least two theoretical plates above the lowest theoretical plate and ending at at least two theoretical plates below the top theoretical plate, The dividing wall 8 is arranged in a column in a region starting above at least one theoretical plate above the lowest theoretical plate and ending below at least one theoretical plate above the top theoretical plate, the enrichment zone 10 and the stripping zone 11 of the column. Minute introduced into The ratio of the liquid amount in the upper end of the wall (8) (upper end) is from 1: 5 is set to the range: 0.2 to 1.