| 摘要 |
<p>The present invention refers to an improved process for producing alkanolamines, which consists of at least two or three Reaction Systems with a liquid phase. The First Reaction System is useful for reacting an epoxide with a mixture of water and ammonia in order to form alkanolamines, in the Second or Third Reaction System the aforesaid epoxide reacts with an alkanolamine or a mixture of water and ammonia in order to form alkanolamines; in the Second or Third Reaction System the aforesaid epoxide reacts with an alkanolamine or a mixture of alkanolamines in liquid phase, virtually in the absence of ammonia or water so as to form more alkanolamines. The invention further comprises a system for Preparing Ammonia Water, a Column for isolating Ammonia, a Column for Drying vacuum alkanolamines; optionally a Column for Concentrating Monoalkanolamine and a system for purifying alkanolamines, which consists of a plurality of vacuum distillation columns. The improved process of the present inv ention is useful for obtaining alkanolamines with a wide range of products distribution without requiring recycling pure amines with regard to the First Reaction System. Moreover, the selection of particular operating conditions of said improved process and the thermal integration among certain sections of the process are carried out in such a manner that a substantial reduction of the energy consumption is achieved, in comparison with conventional processes, thereby producing the same amount of products. Said improved process can be used in the construction of novel unities for producing alkanolamines, as well as in the modification of former unities, which require changing the distribution of the obtained products and increasing the production capacity or reducing the energy consumption.</p> |
