公开(公告)号：BRPI0413168A

公开(公告)日：2006-10-03

申请号：BRPI0413168

申请日：2004-07-15

Applicant: BASF AG

Inventor： BESTE YORK ALEXANDER ,  SCHOENMAKERS HARTMUT ,  ARLT WOLFGANG ,  SEILER MATHIAS ,  JORK CARSTEN

IPC: B01D3/14 ,  B01D3/34 ,  B01D3/40

Abstract: An extraction-rectification process produces a low-volatile sump fraction and ionic fluid, in a reaction in which the ionic fraction is used as an entrainer. The sump fraction is discharged to an evaporator stage operated at a pressure of less than 500 mbar, thereby separating most of the low-volatile fraction from the ionic fluid. The low-volatile content in the ionic fluid falls to less than 5% wt. Alternatively, the discharging sump fraction is surrendered to a stripper where it is exposed to an inert gas or super-heated steam at ambient pressure or less than 900 mbar. The ionic fluid is surrendered to a further stripper where it is exposed to an inert gas or super-heated steam at ambient pressure or less than 500 mbar. The inert gas is dry air. The ionic fluid yield is returned to the extraction-rectification column. An independent claim is included for a process to separate mixtures of polar and non-polar substances that form azeotropes, or have a narrow boiling point range.