Hoechst Aktiengesellschaft

Ernst Horoldt

Siegbert Rittner

Kurt Kraft

Jurgen Ritz

Herbert Kuckertz

Franz Jakob

Richard Grimm

Helmut Vollmuller

Harald M Strobel

Wilfried Billmann

Heinz D Bernhard

Adam Urschel

A process for the separation of undesired organic ingredients from waste gases which are formed in the preparation of aromatic intermediates which comprises washing the waste gases with a washing liquid comprising

Process for separating organic constituents from waste gases of the

Process for the removal of the residual sulfuric acid from the reaction mixture which has been obtained in the reaction of paraffin with sulfur dioxide, oxygen and water under irradiation by UV light and which has been freed from sulfur dioxide by degassing at an elevated temperature and from which the bulk of the sulfuric acid has been removed by concentration, by warming this concentrated product and adding as much of an alkali metal carbonate, peroxide, hydroxide, sulfate or sulfonate as is required to convert the residual sulfuric acid into an alkali metal bisulfate.

Process for the removal of the residual sulfuric acid from the reaction

Molding compositions containing triketoimidazolidine precondensates,

The invention relates to a process and device for the production of highly concentrated spinning solutions from acrylonitrile polymers, where the dissolving is carried out in one step in a stirred mixing vessel, which has a disc-shaped stirrer rotating in a horizontal plane, the polymeric material to be dissolved and the solvent are metered in separately at room temperature into the stirring vortex which is formed, and the temperature of the solution being formed is maintained at a constant preset value in the range from 60.degree. to 120.degree. C. by controlling the peripheral velocity of the stirrer.

Continuous process for the production of highly concentrated spinning

Growing community of inventors

Kelkheim, Germany

Ernst Horoldt