The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 24, 2004
Filed:
Jan. 09, 2002
Christoph Rüdinger, Starnberg, DE;
Harald Herbert Voit, Reischach, DE;
Michael Hallmann, Hochburg-Ach, AT;
Mehmet Günaltay, Emmerting, DE;
Barbara Geborene Neé Reil Wild, Emmerting, DE;
Hans Jürgen Eberle, München, DE;
Consortium fur Elektrochemische Industrie GmbH, München, DE;
Abstract
A method for the separation and purification of an aqueous mixture of main components, namely acetic acid and formic acid and non-volatiles by extraction, uses a solvent in a circulatory system. A raffinate stream is mixed with the larger proportion of water from a solvent stripper column ( ) for the removal of water. The extraction stream is introduced into a solvent distillation column ( ), from which in a first step involving the use of a mixture (A) containing a larger proportion of the solvent is separated out via a header and a mixture (B) of formic acid, water and solvent is separated out via a side offtake and a mixture (C) of acetic acid and non-volatiles is also separated out. A mixture (B) is introduced into a formic acid distillation column ( ) for further processing, and a mixture (C) is introduced into an acetic acid distillation column ( ), and purified acetic acid is subsequently isolated in the acetic acid distillation column ( ) from the header. Pure formic acid is isolated at the settling basin of the formic acid distillation column ( ).