Molecular networks may be considered as elastic fluids, the conformational abilities of which are adecuately characterized with the aid of the model of a Van der Waals conformational gas with weak interactions. The internal properties are submitted to the conditions of internal equilibrium, thus, having their changes uniquely related to the global transformations of the network upon deformation. The global properties are at least determining the limits of stability which are expressed in the Van der Waals approach by formulating of a reduced equation of state of real networks. lt will be discussed on hand of thermo-elastic measurements and its quantitative description what is in need for a full and self-containing phenomenological description of molecualr networks.

In this paper the simulation of separation systems LV ( G) for simple multistage multicomponent absorbers and absorbers with reboiler , where mixtures are considered ideal behavior and distillation processes is studied which mixtures can be considered ideal or not with behavior ideal. The simulation of such separation process is performed using the Newton -Raphson method numerical 2N . For non-ideal mixtures the activity coefficient is used in the liquid phase , which is evaluated from thermodynamic models : Wilson, NRTL , UNIQUAC and UNIFAC . In this paper the mathematical model and simulation program developed for the separation of these processes is described. A variety of examples have been used to test the functionality of the program. The results produced by the program are compared with those for the CHEMCAD III. It has also conducted sensitivity analysis for the initial temperatu...

Molecular networks may be considered as elastic fluids, the conformational abilities of which are adecuately characterized with the aid of the model of a Van der Waals conformational gas with weak interactions. The internal properties are submitted to the conditions of internal equilibrium, thus, having their changes uniquely related to the global transformations of the network upon deformation. The global properties are at least determining the limits of stability which are expressed in the Van der Waals approach by formulating of a reduced equation of state of real networks. lt will be discussed on hand of thermo-elastic measurements and its quantitative description what is in need for a full and self-containing phenomenological description of molecualr networks.

In this paper the simulation of separation systems LV ( G) for simple multistage multicomponent absorbers and absorbers with reboiler , where mixtures are considered ideal behavior and distillation processes is studied which mixtures can be considered ideal or not with behavior ideal. The simulation of such separation process is performed using the Newton -Raphson method numerical 2N . For non-ideal mixtures the activity coefficient is used in the liquid phase , which is evaluated from thermodynamic models : Wilson, NRTL , UNIQUAC and UNIFAC . In this paper the mathematical model and simulation program developed for the separation of these processes is described. A variety of examples have been used to test the functionality of the program. The results produced by the program are compared with those for the CHEMCAD III. It has also conducted sensitivity analysis for the initial temperatu...