Rhodia Acetow Gmbh

Solvay Acetow Gmbh

Cerdia International Gmbh

Thomas Krumrey

Andreas Hummel

Dirk Hölter

Dietmar Kern

Martin Moser

Daniel Amoros

Mathias Brehelin

Dieter Ruf

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 present invention relates to a method for producing a packed bale of highly compacted filter tow material. A compressed filter tow bale is first provided in cuboid shape in a baler. Then the compressed filter tow bale is packaged, having an air-tight packaging sleeve fully enclosing the compressed filter tow bale. According to the invention, the packaging sleeve is applied to the compressed filter tow bales such that at least 80%, preferably at least 90% and more preferably at least 95%, of the packaging sleeve is directly adjacent to the highly compacted filter tow material and touches, or is at least spaced less than 15 mm from, the highly compacted filter tow material.

Method for producing a packed filter tow bale

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.

Process for the recovery of acetic acid

The invention relates to methods for simultaneously producing crimped fiber strips in parallel, in particular filter tow strips, in a crimping machine (KM) having an inlet region (), a squeezing zone () formed between two transport rollers (), and a compression channel (), comprising the following steps: a) simultaneously feeding in parallel a plurality of fiber strips () via the inlet region (), wherein the fiber strips are guided separately in the inlet region (), using a first separating device (), b) simultaneously transporting and compacting in parallel the fiber strips in the squeezing zone () by way of the two transport rollers (), and c) simultaneously crimping in parallel the fiber strips in the compression channel (), wherein the fiber strips are guided separately in method step b) by using a second separating device () and in method step c) by using a third separating device (), and wherein the first, second and third separating devices () are designed such that the separate guidance in parallel of the fiber strips takes place from the inlet region () through the squeezing zone () into the compression channel () without interruption. Moreover, the invention relates to an apparatus for executing said method. The invention enables the simultaneous formation of a plurality of separate, crimped fiber strips, having a substantially constant and symmetric crimping characteristic over the respective entire fiber strip cross-section, and in particular also cost-effective production of crimped filter tow strips, having a low overall titer, by avoiding the phenomenon of the split-off edge, by way of a conventional spinning and crimping machine.

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Teningen, Germany

Thomas Krumrey