The generation of test gas from pure liquids has a wide variety of applications in laboratory and field experiments, for which the quality of the test gas is of significance. Therefore, various methods for test gas generation have been designed. Each method has unique advantages and disadvantages. Thus, a short overview is presented within the scope of this paper. Furthermore, a common bubbler system is presented, which was built to generate test gas from volatile organic compounds for experimental usage in laboratory applications. An analysis is conducted with respect to the generated concentrations at different temperatures and flow rates of the diluting gas. Accuracy and stability of this method are investigated.

Effective Separation of Gas and Fluid Phases by Means of Selective AdsorptionAdsorption is a versatile tool for the separation of low abundant molecules from complex mixtures. The affinity and selectivity of the adsorbents are crucial parameters for the efficiency of the separation process. This work provides an overview of the basic adsorption mechanisms and illustrates their relevance for technical applications based on own experimental data in bioprocess, environmental and safety engineering. Distinctive features between the adsorption from the gas and fluid phase, respectively, the differences between small molecules and interacting biomacromolecules are presented.

Nowadays sustainable technologies gain in importance. A promising field of activity is the exhaust air treatment by adsorption, especially the removal and recovery of valuable substances like solvents. In this letter three types of adsorbents, being the critical part in technical separation processes by adsorption, are evaluated according to separation of isopropanol from humid air. Isopropanol has been chosen as it is one of the frequently used solvents which need to be separated from humid air in practice. The suitability and performance as well as information about the possible constraints are derived from state of the art measurements and multifaceted analyses of the experimental data. The evaluation is based on physical data, isotherms at different temperatures and for both components, isopropanol and water, as well as on energetic calculations and comparison with values from recent literature.

Selective Adsorbents Enhancing Exhaust Air Treatment for the Food-Processing IndustryMethods and criteria for the evaluation and characterization of specific acting adsorbents are introduced. The results of the investigation are used to verify a new multivariate cluster analysis tool. Hence, in contrast to common screening procedures, the expenditure of time and effort for choosing optimized adsorbents can be minimized. The importance of the adsorption of water vapor and the possibilities to influence the adsorbents by modifications are presented. Finally, the economic and technical advantages of adsorption for exhaust air treatment within the food-processing industry are discussed.

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