Abstract: The present invention relates to stable salts of O-acetylsalicylic acid with basic amino acids, a process for their preparation and their use as medicaments.

Abstract: A process for the separation a substantially adduct-free diaryl carbonate from reaction solution is disclosed. The process entails obtaining a solution that contains diaryl carbonate, catalyst system components and an aromatic solvent, lowering the temperature of the solution, optionally in the presence of a nucleating agent, to produce a crystallization product, and washing the crystallization product with an anhydrous wash solution to remove catalyst residues and impurities.

Abstract: The present invention relates to stable salts of O-acetylsalicylic acid with basic amino acids, a process for their preparation and their use as medicaments.

Abstract: The present invention relates to stable salts of O-acetylsalicylic acid with basic amino acids, a process for their preparation and their use as medicaments.

Abstract: A process for the separation a substantially adduct-free diaryl carbonate from reaction solution is disclosed. The process entails obtaining a solution that contains diaryl carbonate, catalyst system components and an aromatic solvent, lowering the temperature of the solution, optionally in the presence of a nucleating agent, to produce a crystallization product, and washing the crystallization product with an anhydrous wash solution to remove catalyst residues and impurities.

Abstract: A process for the separation a substantially adduct-free diaryl carbonate from reaction solution is disclosed. The process entails obtaining a solution that contains diaryl carbonate, catalyst system components and an aromatic solvent, lowering the temperature of the solution, optionally in the presence of a nucleating agent, to produce a crystallization product, and washing the crystallization product with an anhydrous wash solution to remove catalyst residues and impurities.

Abstract: A process for the separation a substantially adduct-free diaryl carbonate from reaction solution is disclosed. The process entails obtaining a solution that contains diaryl carbonate, catalyst system components and an aromatic solvent, lowering the temperature of the solution, optionally in the presence of a nucleating agent, to produce a crystallization product, and washing the crystallization product with an anhydrous wash solution to remove catalyst residues and impurities.

Abstract: The invention relates to frost-stable aqueous alkaline solutions of highly concentrated o-phenylphenol and to their use as preservatives.

Abstract: The present invention relates to stable salts of O-acetylsalicylic acid with basic amino acids, a process for their preparation and their use as medicaments.

Abstract: The invention relates to frost-stable aqueous alkaline solutions of highly concentrated o-phenylphenol and to their use as preservatives.

Abstract: The invention relates to a process for the preparation of nifedipine by the reaction of methyl 2-(2-nitrobenzylidene)acetoacetate and methyl 3-aminocrotonate and the use of the nifedipine thus prepared for the production of a medicament.

Abstract: Catalyst systems with a content of a platinum-group-metal catalyst, a co-catalyst, a quaternary salt and a base for the oxidative carbonylation of aromatic hydroxy compounds to the corresponding diaryl carbonates are according to the invention obtained as a mother liquor by suspension crystallization and can be returned into the carbonylation reaction or worked up to valuable materials. The crystallizate, which consists predominantly of diaryl carbonate and the parent aromatic hydroxy compound, is worked up to pure diaryl carbonate and pure hydroxy compound.

Abstract: Catalyst systems with a content of a platinum-group-metal catalyst, a co-catalyst, a quaternary salt and a base for the oxidative carbonylation of aromatic hydroxy compounds to the corresponding diaryl carbonates are obtained according to the invention as a residual melt by melt crystallization and can be returned into the carbonylation reaction or worked up to valuable materials. The melt crystallizate, which consists predominantly of diaryl carbonate and the parent aromatic hydroxy compound, is worked up to pure diaryl carbonate and pure hydroxy compound.

Abstract: Ethylene glycol carbonate (EGC) can be isolated in purified form from contaminated material which contains impurities from the group comprising starting materials, by-products and/or catalysts of the preparation process in that the contaminated EGC is subjected to a fractional melt crystallization and the crystals of the purified EGC formed in this case are mechanically separated off from the remaining impurities dissolved in the residual melt.

Abstract: The invention relates to a special process for the production of high-purity bisphenol A from acetone and phenol in the presence of acidic catalysts.