SEPARATION OF A SUBSTANCE MIXTURE CONSISTING OF HYDROGEN CHLORIDE AND PHOSGENE
The invention relates to a method for partially or completely separating a substance mixture consisting of hydrogen chloride and phosgene, optionally of solvents and optionally of low-boiling fractions and inert substances such as those that normally arise during the production of isocyanates by rea...
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Format: | Patent |
Sprache: | eng ; spa |
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Zusammenfassung: | The invention relates to a method for partially or completely separating a substance mixture consisting of hydrogen chloride and phosgene, optionally of solvents and optionally of low-boiling fractions and inert substances such as those that normally arise during the production of isocyanates by reacting amines with phosgene. The inventive method is characterized in that a partial or complete condensation of phosgene is firstly carried out followed by a distillation or stripping inside a column for removing the hydrogen chloride from the bottom product phosgene and lastly, a washing of the top product hydrogen chloride with the process solvent for absorbing the phosgene in the process solvent is carried out. A subsequent purification by means of adsorption on activated carbon or other appropriate methods can be used for removing solvent remnants.
La invencion se refiere a un metodo para separar parcial o totalmente una mezcla de sustancias que consiste de cloruro de hidrogeno y fosgeno, opcionalmente de solventes y opcionalmente de fracciones de sustancias de bajo punto de ebullicion y sustancias inertes tales como las que surgen normalmente durante la produccion de isocianatos por reaccion de aminas con fosgeno. El metodo de la presente invencion se caracteriza porque una condensacion parcial o completa de fosgeno se lleva a cabo primero, seguido por una destilacion o agotamiento en una columna para remover el cloruro de hidrogeno del fosgeno de producto de fondo y finalmente se lleva a cabo un lavado de cloruro de hidrogeno de producto superior con el solvente de proceso para absorber el fosgeno en el solvente de proceso. Una purificacion subsiguiente a traves de adsorcion en carbon activado u otros metodos apropiados puede utilizarse para remover los restos de solvente. |
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