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Fecha de registro: 14 may 2022

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Esko Artios CAD V12.0 Torrent.zi chadhono



 


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paul jacobs x-ray and geometry - 3d engineering software. Malaga Design 2022. Esko Artios CAD v12.0 | WINDOWS | 392 MB EFI Fiery eXpress v4.6.1 | paul jacobs x-ray and geometry - 3d engineering software | Description The paul jacobs x-ray and geometry - 3d engineering software is. Www.cadsoft.it Category: Computer-aided design softwareThe present invention relates to a process for the preparation of organic polyisocyanates or their mixtures of isomeric organic polyisocyanates, especially those having a linear structure, which is based on the poly-N-phenylcarbamylation of suitable aromatic amines in a low-temperature batchwise distillation. The N-carbamylation of aromatic amines has been known for a long time, starting with the publication of a paper by P. G. Manners and A. M. L. Taylor, J. Chem. Soc. (1935) 1548, in which N-carbamylation of aniline with cyanamide was carried out. According to EP-A-0 174 791, the reaction product obtained in this way can be reacted further with a polyfunctional cyanate, for example, with isocyanato-trimethylchlorosilane or with phosgene, in order to obtain the corresponding isocyanates. In EP-A-0 291 872, the N-carbamylation of aromatic amines is also described, which is carried out in one step in an organic solvent. In DE-C-26 10 881, N-carbamylation is also described, which is carried out in a two-phase system, in which the organic solvent used is replaced by water. EP-A-0 517 049 describes the distillation of the reaction product obtained in the N-carbamylation of aromatic amines, starting with a binary mixture of aniline and cyanamide, in which the amine is firstly reacted with cyanamide in a low-temperature batchwise distillation, and the reaction mixture is subsequently reacted with a polyfunctional cyanate. The problems that result in this case from the distillation of reaction mixtures are that part of the amine that has been converted in the N-carb

 

 

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Esko Artios CAD V12.0 Torrent.zi chadhono

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