反应详情

Another embodiment of the invention utilizing the same amine groups in similar manner is the addition of one or more amine of Group A to a CAA having a high (>2,000 ppm) level of acetic acid. This high acetic acid-containing CAA feed stream may be fed to an acetic add distillation column, that is, a distillation column used for effectively reducing, by its distillation, acetic acid from the CAA. Distillation of the Group A-treated CAA yields a low acrolein (also now low acetic add) CAA. (The Group A amine can be fed to the acetic acid removal column as a separate stream as the high acetic acid CAA is fed to the column.) Subsequently, the low acrolein CAA is fed to a final distillation column, i.e., a high purity acrylic acid distillation column, where the final distillation steps, previously described, are carried out.

1. additionadd
2. distillationdistillation column
3. distillationa distillation column
4. distillationfor effectively reducing, by its distillation, acetic acid from the CAA
5. distillationDistillation of the Group
6. additionA-treated CAA