Modeling and simulation are the principal approaches employed for quantitative descriptions of processes and process systems in chemical and process engineering for the solution of scientific and engineering problems.  From a scientific point of view, the quantitative process description addresses the process mechanism.  The creation of a hypothesis about the process mechanism is followed by a mathematical model and proof of its adequacy, which in fact is a proof of the hypothesis.  The employment of modeling and simulation during the quantitative description of processes and systems needs clear determination of the chemical engineering and the chemical technology problems. 

Chemical engineering is a branch of the chemical sciences concerning implementations of physical chemistry processes at an industrial scale in chemical plants.  Chemical engineering employs modeling or simulation of processes as the principal tool based on an amalgam of fundamentals of chemistry, physics and mathematics.  The main target of such investigations is the quantitative description of the process mechanisms and kinetics under industrial conditions.  These descriptions are the first steps of the optimal process design, process control, and plant renovation.  The industrial implementation of physical chemistry processes considers purely chemical and physical phenomena whose performance is affected mainly by the scale of the contacting devices used.

Chemical technology is a science oriented towards the creation of technological schemes including the consequences of processes.  The flowsheet synthesis provides all the relationships between the processes at the flowsheet sublevels that need a systematic approach to be employed.  In this context, the objects of the investigations of chemical technology are technological systems.  The analyses of such systems with the methods of the system techniques are in the domain of process system engineering.  Such an approach is not trivial and it is based on some common suggestions, among them.  Separate chemical and physical (hydrodynamic, diffusion, thermal, adsorption, etc.) processes of chemical technologies are the subjects of chemistry and physics. 

The simulation occurrence of these processes in industrial devices is the subject of chemical engineering.  In this context, the complex interrelations between the processes of technological systems are a subject of chemical technology.  It should be noted that the system synthesis and optimization are also branches of process system engineering.  These standpoints allow chemical technology to be described as a chemical engineering system technique employing both modeling and simulations as working methods based on the developments of chemical engineering and applied mathematics.  The main goal of studies employing these methods is the quantitative descriptions of the systems and the subsequent optimal process design, process control and plant renovation.  It should be noted that optimal reconstruction could be defined as a renovation from a more generalized point of view.  Thus, the development of the system towards a better and more efficient state with respect to the existing situation is the main purpose of the renovation.

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