Separation of raw biogas with PIM based membranes and liquid infused membranes

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27710%2F23%3A10252420" target="_blank" >RIV/61989100:27710/23:10252420 - isvavai.cz</a>

Result on the web

<a href="https://euromembrane2022.eu/" target="_blank" >https://euromembrane2022.eu/</a>

DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Separation of raw biogas with PIM based membranes and liquid infused membranes

Original language description

Biogas represent an alternative gas fuel where unwanted impurities are removed from CH4 to avoid corrosion of pipelines or engines and increase its calorific value. The potential of an ultrapermeable benzotriptycene-based polymer of intrinsic microporosity (PIM-TMN-Trip) for the upgrading of raw biogas was investigated. Permeation measurements were performed with model mixtures as well as real biogas from a sewage treatment plant. Permeability and CO2/CH4 selectivity for either pure gases or for real biogas up to feed pressure 5 bar were high and lie almost on the recently defined 2019 Robeson upper bound based on ideal permselectivities. Further, a remarkable increase in CO2/CH4 selectivity was observed after two weeks of continuous exposure to CO2 due to a significant decrease of CH4 permeability. The constant CO2 permeability and increased selectivity upon ageing suggest that ageing in the presence of CO2 causes rather a rearrangement than a reduction of the fractional free volume. The mixed gas permeability measurements were performed with high stage-cut in order to mimic a real separation process, and the results confirmed the potential of PIM-TMN-Trip membranes for biogas upgrading. Also we compare price of the membrane module consisting of such functional layer with conventionally available modules for biogas upgrading. On the other hand, we have previously demonstrated that separation membrane units for biogas upgrading based on cheaper thin film composite (TFC) membranes for reverse osmosis can be used under conditions when water condensing layer is formed at hydrophilic polyamide functional layer. The selectivity water swollen barrier is able to remove unwanted impurities such as CO2 and H2S due to significantly higher solubility of them in water. The selection of the most suitable thin hydrophilic composite membrane is discussed and other physical or chemical modification of the functional layer were tested.

Czech name

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Czech description

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Type

O - Miscellaneous

CEP classification

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OECD FORD branch

20400 - Chemical engineering

Project

<a href="/en/project/EF17_049%2F0008419" target="_blank" >EF17_049/0008419: Support of cross-sectoral cooperation in the field of environmental pollutants reduction and waste recovery</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2023

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů