Consortium Fur Elektrochemische Industrie Gmbh

Consortium F&uuml;r Elektrochemische Industrie Gmbh

Mehmet G&uuml;naltay

Harald Voit

Michael Hallmann

Christoph R&uuml;dinger

Hans-J&uuml;rgen Eberle

Barbara Geborene Ne&eacute; Reil Wild

Barbara Reil

Hans J&uuml;rgen Eberle

The invention relates to a method for separating and purifying an aqueous mixture that mainly consists of acetic acid, formic acid and high-boiling substances by extraction with a solvent in a cyclic process. The inventive method is characterized in that the flow of raffinate is fed to a solvent stripping column ( ) with the major part of the water in order to remove the water from the cycle. The flow of extract is fed to a solvent recovery distillation column ( ). In a first step, a mixture (A) that consists of water and solvent, is separated by overhead distillation. A mixture (B) that consists of acetic acid, formic acid and high-boiling substances is separated via a sump. Once the formic acid is removed in a column ( ), mixture (B) is separated in an acetic acid distillation column to give pure acetic acid and high-boiling substances. Mixture (A) is fed to a phase separator and the aqueous phase is returned to the solvent stripping column ( ) together with any residual portions of the solvent while the organic phase is returned to the extractor ( ).

Method for separating and purifying an aqueous mixture that mainly consists of acetic acid and formic acid

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 ( ).

Method for the separation of and purification of an aqueous mixture consisting of the main components acetic acid and formic acid

Growing community of inventors

Emmerting, Germany

Mehmet Günaltay

Growing community of inventors

Emmerting, Germany

Mehmet G&uuml;naltay

Mehmet Günaltay