| 摘要 |
The invention relates to an improved process for making available, for an intended downstream application (i.e. for a chemical reaction), the hydrogen chloride by-product that is produced during production of an isocyanate by phosgenation of the corresponding amine, where, by reducing the pressure of the crude product, a portion of the entire hydrogen chloride produced is obtained in gaseous form at a pressure that is higher than the pressure desired for the downstream application, and the remaining portion of the entire hydrogen chloride produced is separated, at a pressure lower than that desired for the intended downstream application, from the crude liquid phosgenation product that remains when the pressure is reduced, and is then compressed to a pressure which is higher than that desired for the downstream application, and where both resultant hydrogen chloride streams are purified, preferably together after they have been combined, in a manner that produces purified hydrogen chloride at a pressure higher than the pressure desired for the downstream application. |
