Abstract:
Die vorliegende Erfindung ist auf ein Verfahren zur Herstellung von Hexamethylenbiscyanoguanidin gerichtet. Diese Verbindung wird als Intermediat zur Herstellung von Chlorhexidin verwandt. Die Bildung des Hexamethylenbiscyanoguanidins läuft unter Basenkatalyse in einem organischen Lösungsmittel ab. Als Base wird erfindungsgemäß Chlorhexidin selbst eingesetzt. Desweiteren ermöglicht diese Erfindung die Herstellung von Chlorhexidin-Base in einem sogenannten Eintopfverfahren ohne Zwischenisolierung des HMBCGs.
Abstract:
The invention is directed to an improved, reliably performable process for preparing triallyl isocyanurate (TAIC) by Cu 2+ -catalysed rearrangement of triallyl cyanurate (TAC) at at least 90°C. According to the invention, TAC and, if required, also a Cu 2+ catalyst and solvent are fed continuously to a start reaction mixture after onset of the initially inhibited isomerization reaction, the isomerization is performed at from 90 to 160°C and an amount of reaction mixture equivalent to the amount of reactant is drawn off continuously and sent to the workup. Preference is given to effecting the isomerization in TAIC as the reaction medium.
Abstract:
The present invention is directed to a process for preparing amides. In particular, the process is directed to a process performable on the industrial scale, in which a ketoxime can be converted to a cyclic or acyclic amide by means of a Beckmann rearrangement using 2,4, 6-trichloro-1, 3, 5-triazine as a catalyst in a nonpolar organic solvent.
Abstract:
The invention is directed to an improved, reliably performable process for preparing triallyl isocyanurate (TAIC) by Cu 2+ -catalysed rearrangement of triallyl cyanurate (TAC) at at least 90°C. According to the invention, TAC and, if required, also a Cu 2+ catalyst and solvent are fed continuously to a start reaction mixture after onset of the initially inhibited isomerization reaction, the isomerization is performed at from 90 to 160°C and an amount of reaction mixture equivalent to the amount of reactant is drawn off continuously and sent to the workup. Preference is given to effecting the isomerization in TAIC as the reaction medium.
Abstract:
Method and apparatus for degermination of waste water and oxidative inactivation of substances contained therein. For degermination of flowing waste water by UV irradiation, the waste water flowing in an effluent launder (230) of a final clarification basin (200) to a launder outlet (250) is allowed to flow, before reaching the launder outlet, into and through a UV irradiation chamber integrated within the effluent launder.
Abstract:
The present invention is directed towards a method for the production of 2, 4, 6-trimercapto-1, 3, 5-triazine (TMT-H 3 ). In particular, the method of the subject matter relates to the operation of acidifying the salts of 2, 4, 6-trimercapto-1, 3, 5-triazine in aqueous solution and in a defined pH range.