Abstract: The present invention relates to a method for producing trimethylolpropane having a low color number by processing a raw reaction solution obtained according to the inorganic Cannizarro process while adhering to precisely defined pH values.

Abstract: The present invention relates to a method for isolating ditrimethylol propane from secondary trimethylol propane production streams.

Abstract: The present invention relates to the industrial production of vinylene carbonate (VC) by elimination of hydrogen chloride from chloroethylene glycol carbonate (CGC) with tertiary amines in the absence of relatively large amounts of additional solvent.

Abstract: The present invention relates to a method for producing trimethylolpropane having a low color number by processing a raw reaction solution obtained according to the inorganic Cannizarro process while adhering to precisely defined pH values.

Abstract: The present invention relates to a method for isolating ditrimethylol propane from secondary trimethylol propane production streams.

Abstract: The present invention relates to a method for the production of trimethylolpropane with a low color number by treatment with activated carbon.

Abstract: The present invention relates to a method for the production of trimethylolpropane with a low color number by treatment with activated carbon.

Abstract: The present invention relates to a process for preparing monomethylhydrazine by methylating hydrazine or hydrazinium hydrochloride or hydrazinium dihydrochloride with methyl chloride and/or a methano/HCl mixture, characterized in that the reaction mixture formed in the methylation is reacted with an organic base from the group of the alkylamines or alkanolamines and monomethylhydrazine is removed by distillation from the reaction mixture in a low boiler fraction and the low boiler fraction is optionally subjected to a further distillation.

Abstract: The present invention relates to the industrial production of vinylene carbonate (VC) by elimination of hydrogen chloride from chloroethylene glycol carbonate (CGC) with tertiary amines in the absence of relatively large amounts of additional solvent.

Abstract: The present invention relates to a process for preparing monomethylhydrazine by methylating hydrazine or hydrazinium hydrochloride or hydrazinium dihydrochloride with methyl chloride and/or a methano/HCl mixture, characterized in that the reaction mixture formed in the methylation is reacted with an organic base from the group of the alkylamines or alkanolamines and monomethylhydrazine is removed by distillation from the reaction mixture in a low boiler fraction and the low boiler fraction is optionally subjected to a further distillation.

Abstract: The present invention relates to a process for preparing trimethylolpropane having a low APHA color number.

Abstract: Noble metal/reducible metal oxide catalysts effective for the direct amination of aromatic hydrocarbons and heterocyclic analogs thereof are disclosed. In one embodiment, the cataloxidant comprises a noble metal selected from Pd, Rh, Ir and/or Ru and a reducible metal oxide. In another embodiment, the cataloxidant comprises a noble metal and a reducible oxide of a metal selected from Ni, Mn, V, Ce, Th, Pr, Te, Re, Co, Fe, Cu and/or Bi. A preferred cataloxidant comprises one or more noble metals selected from Pd, Rh, Ir and/or Ru, in combination with nickel oxide and/or manganese oxide. In preferred applications, benzene can be aminated in the presence of the cataloxidants to form aniline. A benzene conversion of at least 5% is achieved, with more than 90% selectivity for aniline. Significantly, the cataloxidant can be regenerated without a substantial loss of performance.

Abstract: The present invention relates to a process for preparing trimethylolpropane having a low APHA color number.

Abstract: Described is a sol-gel supported catalyst comprising: (i) a first metal oxide selected from the group consisting of silicon oxide, aluminum oxide, titanium oxide, zirconium oxide and mixtures thereof; (ii) a second metal oxide selected from the group consisting of oxides of the elements of groups 4, 5, 6, 7, 11, 12, 13, 14, the iron group (atomic numbers 26 to 28), the rare-earth metals (atomic numbers 58 to 71) and mixtures thereof; and (iii) a metal selected from the group consisting of platinum metals, compounds of platinum metals (atomic numbers 44 to 46 and 77 and 78) and mixtures thereof. The sol-gel supported catalyst is prepared by: (a) providing a sol-gel comprising (i), (ii) and (iii); (b) aging the sol-gel to obtain an aged sol-gel; (c) drying the aged sol-gel to obtain said catalyst; and (d) optionally annealing the dried catalyst obtained in step (c).

Abstract: Described is a process for preparing an aromatic carbonate, e.g., diphenyhl carbonate, in which an aromatic hydroxy compound, e.g., phenol, is reacted with carbon monoxide and oxygen in the resence of a supported catalst prepared by a sol-gel process, a quatermary ammonium or phosphonium salt and a base. The sol-gel supported catlyst comprises: (i) a first metal oxide selected from the group consisting of silicon oxide, aluminum oxide, titanium oxide, zirconium oxide and mixtures thereof; (ii) a second metal oxide selected from the group consisting of oxides of the elements of groups 4, 5, 6, 7, 11, 12, 13, 14, the iron group (atomic numbers 26 to 28), the rare-earth metals (atomic numbers 58 to 71) and mixtures thereof; and (iii) a metal selected from the group consisting of platinum metals, compounds of platinum metals (atomic numbers 44 to 46 and 77 and 78) and mixtures thereof. The sol-gel supported catlyst is aged, dried and optionally annealed prior to use in the process of the present invention.

Abstract: A catalyst containing (i) at least one oxide of an element selected from the group consisting of silicon, aluminum, titanium and zirconium and (ii) at least one metal oxide of an element selected from groups 4, 5, 6, 7, 11, 12, 13 and 14, the iron group and the rare earth metals, and (iii) at least one platinum metal or compound of platinum metal is disclosed. A method for preparing the catalyst and a process for preparing an organic carbonate using the catalyst are also disclosed.

Abstract: A platinum metal-containing supported catalyst in which the support contains mixed oxides of metals, transition metals and semiconductor elements, which can act as redox catalysts under the reaction conditions is disclosed. Also disclosed is the preparation of these catalysts and their use in a process for preparing diaryl carbonates.

Abstract: 4-aminodiphenylamines are prepared by hydrogenating nitrosobenzene or mixtures of nitrosobenzene and nitrobenzene with hydrogen in the presence of bases containing hydroxide, oxide and/or alkoxide groups and heterogeneous catalysts in inert aprotic solvents at temperatures of from 0 to 200.degree. C. and at pressures of from 0.1 to 150 bar.

Abstract: 4-aminodiphenylamines are produced by hydrogenating nitrobenzene with hydrogen in the presence of bases containing hydroxide and/or oxide groups and heterogeneous catalysts and in the presence of inert aprotic solvents at temperatures of 0 to 200.degree. C. and pressures of 0.1 to 150 bars.

Abstract: Carbazole can be prepared by dehydrogenation of compounds of the formula ##STR1## or by aminating dehydrogenation of compounds of the formula ##STR2## at 300.degree. to 600.degree. C. in the presence of hydrogen over an iridium catalyst or an iridium-containing catalyst.