| 主权项 |
1. A process system for separating chemicals, said system comprising:
a first distillation column (100), a first decanter (122), and a third distillation column (106), wherein:
said first distillation column (100) is configured to receive a mixture that comprises water and at least formic acid and acetic acid, which are organic acids, and an extractant that comprises at least one of the following: hexanol, an ester of hexanol with said at least two organic acids, and 2-methylpentanol;said first distillation column (100) is configured to form a heterogeneous azeotrope of water and extractant at its top (104) on the basis of reactive heteroazeotropic extractive distillation not controlling the chemical reactions of the extractant and said at least two organic acids, which azeotrope said first distillation column (100) is configured to remove through its top (104) into the first decanter (122) to separate water from organic acid;said decanter (122) is configured to separate the heterogeneous azeotrope of water and extractant into an organic phase which, as a substance less dense than water, rises to the top in the decanter (122) and an aqueous phase with a greater density remains at the bottom of the decanter (122);said first distillation column (100) is configured to feed said at least two organic acids, extractant and water to the third distillation column (106); andsaid third distillation column (106) is configured to form extractant at its bottom (110) for recovery and/or recycling, and the third distillation column (106) is configured to form, based on distillation, a mixture of water and said at least two organic acids at its top (112) for recovery and/or recycling. |
