The Synthesis Of Solution-Structures Of Azeotropic-Distillation Systems

The purpose of separation-network synthesis is how to choose suitable separate methods and to confirm the best separate sequence in terms of economic competence. Separation-network synthesis,as a part of process synthesis,is studied with important meaning.But because of the complexity and multiformity of the separation-network synthesis itself,the actual theory and method can only solve some simple problems relatively,which exist lots of difficulties and deficiencies in the research of the separation-network synthesis.The work presented in this thesis aims at providing a new method of separation-network synthesis based on analysis of separation process itself.In the thesis,the methods of Solution-structures generation are illustrated by taking heterogenerous azeotropic-distillation systems for example .First, ternary heterogene- rous azeotropic mixture is studied with residue curve maps(RCM) to determine the separation direction,and then all the candidate operating units are identified by an innovative method of partitioning lumped materials with the critical curves and lines.At last,we generate the solution-structures and then find the optimal solutions under the restriction of simple objective functions.In the thesis, HOAc-Toluene-Water system and HOAc-Water-EtOAC system are taken as examples to demonstrate two methods of feasible flowsheets generation,and the results show that backward synthesizing of solution-structures from maximal structure involve all the ones so that the optimal flowsheet cann't be lost,and the systematic method of partioning the lumped materials is essential for synthesizing process,and what's more important,the innovative method of generating the maximal structure is highly effective and right.