Análise da permeabilidade ao gás hidrogênio de recipientes para amostras laboratoriais

Abstract

Due to their light weight and small size, hydrogen molecules can easily penetrate materials, posing challenges for the storage of this gas. The aim of this study is to analyze the hydrogen permeability of the commercial polyvinyl fluoride (PVF) bag, as well as to develop and test the hydrogen permeability of a polyvinyl chloride (PVC) container developed in the Heat and Mass Transfer Laboratory (LTCM). For this, gas chromatography was used, along with the Clapeyron Equation, to determine the concentrations of each gas in a H2 + CH4 + CO mixture over several days. It was found that the commercial PVF bag is not a good option for storing gases with a high H2 concentration, as it is highly permeable, causing the sample to lose its initial characteristics rapidly, with about 5% of the H2 concentration lost. However, the PVC container developed in the laboratory proved to be a viable alternative, as it was able to maintain the concentrations of the gases in the aforementioned mixture almost constant for twenty days. This result provides a practical application by facilitating laboratory work in the storage of hydrogen containing gas samples. Furthermore, it is expected that the results of this study will offer a practical application and enhance the analyses and work to be developed in the Experimental Thermochemical Laboratory, which will be built at UFU, Glória Campus.