Abstract: 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(a) paraffinic hydrocarbons having from 10 to 20 carbons atoms or(b) diisopropylnaphthalene or a mixture of isomers thereof having the sum formula C.sub.16 H.sub.20, an average molecular weight in the range of from 210 to 215, a boiling range in the range of from 290 to 300.degree. C. (according to DIN 51 761) and a flash point above 130.degree. C. (according to DIN 51 758).at a temperature in the range of from 0 to 50.degree. C. to remove the said undesired organic ingredients.

Abstract: 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.

Abstract: Molding composition containing(a) 2,4,5-triketoimidazolidine precondensates containing terminal oxamide ester, urethane and/or isocyanate groups and(b) customary organic and/or inorganic fillers, which contains the triketo compound (a) in the form of an amorphous precondensate as a reactive filler and(c) at least one further reactive component of a binder from the group consisting of phenolic resins, amine resins, epoxide resins, polyester resins, hydrocarbon resins containing functional groups and/or polymerization resins containing functional groups; their use for manufacturing radiation-, light- and/or heat-resistant and/or abrasion-resistant shaped articles.

Abstract: Molding composition containing(a) 2,4,5-triketoimidazolidine precondensates containing terminal oxamide ester, urethane and/or isocyanate groups and(b) customary organic and/or inorganic fillers, which contain the triketo compound a) as a reactive filler in the form of a composite of a.sub.1) a 2,4,5-triketoimidazolidine precondensate pulp and a.sub.2) a pulp of other fiber-forming polymers or, instead of this pulp a.sub.

Abstract: 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.