In the series of environmental protection measures avoidance-utilisation-disposal the greatest priority in the chemical industry is given to the first, particularly since it is the chemical reaction which predetermines the nature and extent of subsequent work-up steps and the environmental burden. This reactor-integrated environmental protection leads to a process reappraisal which is divided into searches for alternative synthetic routes, reactants, reaction media, and catalysts. However, one of the principal tasks concerns reexamination of the thermodynamics and kinetics, not only to ensure optimised concentration and temperature control but also to examine the possibility of integrating separation operations during the course of reaction with the aim of shifting equilibria.