Rhodia Acetow Gmbh

Solvay Acetow Gmbh

Rhodia Operations

Cerdia International Gmbh

Andreas Hummel

Thomas Krumrey

Dirk Hölter

Philippe Lapersonne

Jean-François Viot

Jean-Francois Viot

Dirk Holter

Hans-Juergen Ehret

Carsten Habeck

Daniel Amoros

Mathias Brehelin

The invention relates to a method for separating acetone from acetone/water mixtures, according to which a partial flow of the acetone/water mixture is concentrated in a column operating under positive pressure in order to obtain a product with an acetone concentration of at least 80 wt. %, and a partial flow of the acetone/water mixture is concentrated in a column operating under normal pressure. The top product from the column operated under positive pressure is used to heat the bottom product of the column operated under normal pressure, by means of a heat exchanger, and the top product is then introduced into the column operated under normal pressure, above the supply of the partial flow of the acetone/water mixture. This method allows the specific energy demand for acetone separation to be significantly reduced, thereby presenting considerable cost advantages. The invention also relates to a device for carrying out such a method.

Method and device for purifying acetone/water mixtures by means of double-effect distillation

The invention concerns a process for the manufacture of an acylated polysaccharide which comprises. (a) reacting a polysaccharide with an acylating agent to produce an acylated polysaccharide and (b) washing the acylated polysaccharide with water containing from 0.05 to 15 mg/l Ca-ions (c) recovering the washed acylated polysaccharide and an aqueous phase containing carboxylic acid from step (b).

Acylation process

Highly cohesive composite materials, formed of at least one polymer and at least one compound selected from among the mineral oxides, silicoaluminates and activated carbon, have:

Highly cohesive composite polymer materials, preparation thereof and, E.G., cigarette filters comprising same

The present invention concerns a process for manufacturing a fraction comprising carboxylic acid anhydride by reaction of a fraction comprising carboxylic acid with a ketene, and the use of the fraction comprising carboxylic acid anhydride in a process for acylation of polysaccharides.

Process for the manufacture of carboxylic anhydride

The present invention concerns a process for the recovery of carboxylic acid from a fraction comprising carboxylic acid and impurities, and a process for the manufacture of treated wood, which comprise the step of submitting a fraction containing carboxylic acid and impurities to a gas stripping operation.

Process for the recovery of carboxylic acid and wood treatment process

Process for the recovery of carboxylic acid, in particular acetic acid containing carboxylic anhydride in particularacetic anhydride and other impurities, which comprises: (a) treating a fraction, in particular a fraction originating from a wood treatment process, containing carboxylic acid and impurities with a metal salt in the presence of water, (b) treating at least part of the fraction obtained from step (a) to remove metal salt and, (c) treating at least part of the fraction obtained from step (b) by distillation, stripping or membrane separation to recover at least a purified carboxylic acid fraction.

The present invention relates to a process for the recovery of acetic acid. The invention more particularly relates to a process comprising a stage of liquid/liquid extraction of an aqueous solution comprising acetic acid and to a stage of distillation of the extract obtained.

Growing community of inventors

Freiburg, Germany

Andreas Hummel