Abstract: Process for reducing hexavalent chromium in oxidic solids, which comprises the steps: a) heating of the oxidic solid containing Cr(VI) to a temperature of from 600 to 1400° C. in an atmosphere containing less than 0.1% by volume of an oxidizing gas and b) cooling of the reaction product obtained after step a) to a temperature below 100° C. in an atmosphere containing less than 0.1% by volume of an oxidizing gas, characterized in that no reducing agent is added to the oxidic solid or to the atmosphere in step a) and b) in the process.

Abstract: The present invention relates to a process for preparing high-purity lithium fluoride proceeding from lithium carbonate, and to lithium fluoride having a preferred morphology.

Abstract: The present invention relates to a process for preparing chromium(III) oxide by reaction of alkali metal chromate with gaseous ammonia, subsequent hydrolysis, isolation of the hydrolysis product and calcination.

Abstract: Process for preparing chromium(III) oxide, which comprises the steps: a) reaction of sodium monochromate with gaseous ammonia, in particular at a temperature of from 200 to 800° C., b) hydrolysis of the reaction product obtained in step a) with the pH of the water for the hydrolysis being reduced before the hydrolysis or that of the alkaline mother liquor being reduced during or after the hydrolysis, to a value of from 4 to 11, preferably from 5 to 10, by means of an acid, c) isolation of the hydrolysis product which has precipitated in step b), preferably at a pH of from 4 to 11, in particular from 5 to 10, and optionally washing and optionally drying and d) calcination of the hydrolysis product obtained in step c) at a temperature of from 700 to 1400° C., in particular from 800 to 1300° C.

Abstract: The present invention relates to a method for preparing low-chloride lithium hexafluorophosphate starting from lithium fluoride and phosphorus pentafluoride and use thereof in an electrolyte.

Abstract: The present invention relates to pure lithium hexafluorophosphate and its use in an electrolyte and also a process for reducing the content of fluoride in lithium hexafluorophosphate.

Abstract: The present invention relates to a process for preparing high-purity, especially low-sodium, lithium difluorophosphate, especially in the form of solutions thereof in organic solvents, proceeding from lithium fluoride and phosphorus pentafluoride.

Abstract: The present invention relates to a process for preparing high-purity, especially low-chloride, lithium hexafluorophosphate, especially in the form of solutions thereof in organic solvents, proceeding from lithium fluoride and phosphorus pentafluoride.

Abstract: The present invention relates to a process for preparing high-purity lithium fluoride proceeding from lithium carbonate, and to lithium fluoride having a preferred morphology.

Abstract: The present invention relates to a process for preparing low-chloride LiPF6, in particular low-chloride LiPF6 solutions, from PCl3 as starting material and via PCl5 as intermediate product, and also to apparatus to be used for this.

Abstract: The present invention relates to the preparation of linear butenes from isobutanol which has preferably been obtained from renewable raw materials by microbial and/or fermentation processes.

Abstract: Process for preparing chromium(III) oxide, which comprises the steps: a) reaction of sodium monochromate with gaseous ammonia, in particular at a temperature of from 200 to 800° C., b) hydrolysis of the reaction product obtained in step a) with the pH of the water for the hydrolysis being reduced before the hydrolysis or that of the alkaline mother liquor being reduced during or after the hydrolysis, to a value of from 4 to 11, preferably from 5 to 10, by means of an acid, c) isolation of the hydrolysis product which has precipitated in step b), preferably at a pH of from 4 to 11, in particular from 5 to 10, and optionally washing and optionally drying and d) calcination of the hydrolysis product obtained in step c) at a temperature of from 700 to 1400° C., in particular from 800 to 1300° C.

Abstract: The present invention relates to a process for preparing chromium(III) oxide by reaction of alkali metal chromate with gaseous ammonia, subsequent hydrolysis, isolation of the hydrolysis product and calcination.

Abstract: Process for preparing ammonium dichromate, comprising the steps of c) thermally decomposing an alkali metal ammonium chromate double salt, especially a sodium ammonium chromate double salt or hydrates thereof, at a temperature up to 200° C., especially of 75 to 190° C., to form ammonium dichromate and d) removing the ammonium dichromate from the decomposition product obtained after step c), by crystallization, characterized in that the alkali metal ammonium chromate double salt corresponds to the formula Mx(NH4)yCrO4 or hydrates thereof, in which M is Na or K, particular preference being given to Na, x is from 0.1 to 0.9, preferably from 0.4 to 0.7, y is from 1.1 to 1.9, preferably from 1.3 to 1.6, and the sum of x and y is 2.

Abstract: Process for preparing chromium(III) oxide, comprising the steps of: a) Decomposing an alkali metal ammonium chromate double salt at a temperature of 200 to 650° C., especially of 250 to 550° C., b) washing the decomposition product obtained after a) and c) calcining the product obtained after b) at a temperature of 700 to 1400° C., especially of 800 to 1300° C.

Abstract: A process for preparing benzomorpholine derivatives is described, in which an o-nitrophenoxy carbonyl compound is hydrogenated in the presence of extraneous metal-doped sponge metal catalysts based on nickel or cobalt with ring formation.

Abstract: A process for preparing acyl amide compounds is described, in which a recrystallized o-nitrophenoxy carbonyl compound is hydrogenated with hydrogen gas in the presence of a nickel sponge metal catalyst with ring closure to form a benzoxazine, which is then reacted with an acyl halide to give the corresponding acyl amide compound.

Abstract: Process for preparing A silver-containing, disperse, water-containing formulation useful for producing electrically conductive and/or optically reflective coatings, which comprises (i) reacting a silver salt solution with a solution containing hydroxide ions, wherein at least one of said solutions comprises a polymeric dispersant, to produce an Ag2O sol, (ii) reacting the Ag2O sol obtained from step i) with a reduction agent, and (iii) purifying the solution obtained from step ii).

Abstract: A process for preparing benzomorpholine derivatives is described, in which an o-nitrophenoxy carbonyl compound is hydrogenated in the presence of extraneous metal-doped sponge metal catalysts based on nickel or cobalt with ring formation.

Abstract: A silver-containing, disperse, water-containing formulation and its use to produce electrically conductive and/or optically reflective coatings is described. The formulation contains at least a) 0.5 to 30 parts by wt. of silver metal particles with an effective diameter of at most 150 nm, preferably at most 100 nm, particularly preferably 40 to 80 nm, with a bimodal size distribution, b) 50 to 99.5 parts by wt. of water and optionally up to 30 parts by wt. of solvent, c) 0.01 to 10 parts by wt. of at least one, in particular polymeric, dispersant, d) 0 to 5 parts by wt. of film-producer, e) 0 to 5 parts by wt. of additives, f) 0 to 5 parts by wt. of conductive polymers, and has a viscosity of at most 150 mPa.s.