Ticona Gmbh

Hoechst Aktiengesellschaft

Cabot Corporation

Aventis Pharma Deutschland, Gmbh

Hoechst Research & Technology Gmbh & Co. Kg

Werner Sievers

Elke Schweers

Reinhold Keller

Andreas Zimmermann

Gunter Muller

Michael Rosenberg

Richard Bicker

Harald B&ouml;nsel

Christine Meister

Frank Richard

Joachim Semel

J&ouml;rg Von Eysmondt

Wolfgang Bauer

Dieter Desch

Ulrich Daiminger

Interpenetrating organic and inorganic networks with a maximum dimension of 100 mn are produced by: (1) mixing aqueous solutions or dispersions of organic polymers capable of forming polymer networks in aqueous phase, polymer precursors or the mixtures thereof and silicon dioxide components; (2) changing the pH value and/or thermally treating the aqueous solution or dispersion in order to form a gel made of interpenetrating organic and silica gel networks and (3) drying the gel.

Nanoporous interpenetrating organic-inorganic networks

The present invention relates to an improved procedure for the chromatographic purification of insulins wherein a pressure-stable organic polymeric chromatography material is used as a stationary phase, and the mobile phase contains at least one water-miscible organic solvent and at least one buffer substance and the pH is from about 7 to about 11.

Procedure for the chromatographic purification of insulins

A process for the post-purification in particular of pyrolysis gases for preparing pure formaldehyde, hemiformal being pyrolyzed in an evaporator, the resulting formaldehyde vapor being passed through a condensed liquid component collected in the bottom area of the evaporator, the condensed liquid component being passed out as a falling film situated on the inner wall through a cooled outlet tube disposed in the bottom area of the evaporator and the formaldehyde vapor being passed through the cooled outlet tube in cocurrent and the liquid component and the formaldehyde being taken off separately at the outlet tube end remote from the evaporator.

Process and device for preparing pure formaldehyde

High-temperature resistant sulfonated aromatic polyether ketone cation exchangers and sulfonated poly (phenylene sulfide) cation exchangers as catalysts at reaction temperature above 150&deg; C

Abstract A process for purifying formaldehyde in which the formaldehyde is scrubbed with alcohol in an absorption unit and in the course of this reacted virtually completely to form the hemiformal and is simultaneously separated off from gaseous impurities in a first purification step. In a desorption unit, the residual impurities are then converted into a gaseous state and separated off from the liquid hemiformal, whereupon the purified hemiformal is thermally cleaved into alcohol and formaldehyde in a pyrolysis unit. The formaldehyde thus prepared is suitable, for example, for preparing oligomers, polymers, dyestuffs and fertilizers, as well as for the treatment of seeds. Process for purifying formaldehyde, its use and plastics prepared using it

Method for purification of formaldehyde, use thereof and plastics produced therewith

The invention relates to a fluidized-bed scrubber containing fluidizing bodies for purifying gases and to processes for its operation. The invention enables the fluidized-bed scrubber to be dimensioned, and the processes to be carried out, in such a manner that the number of fluidizing bodies is minimized and as much energy as possible is saved, without this decreasing the purifying efficiency.

Column and processes for purifying solvent-containing gases

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Frankfurt-am-Main, Germany

Werner Sievers