| Résumé : |
Protecting the global climate is an undertaking that presents both industry and society with a major task. It will not be possible to achieve the climate targets simply by limiting global emissions, by saving carbon dioxide (CO2). This is because there wiII continue to be unavoidable CO, emissions that wiII nevertheless have to be compensated. Ways out of this unfortunate situation can be measures such as reforestation, carbon sequestration in the soiI or even the active capture of CO, from the air. Such so-called 'direct air capture technologies', are already being tested from various approaches on a research scale or in pilot plants. In one of these processes, special filters are used to remove CO, from the atmosphere. As part of a research project, the German Institutes of Textile and Fiber Research (DITF), Denkendorf/Germany, are developing textile materials for separating CO, from the air. CO, can be fixed in this way over the long term and thus permanently removed from the climate cycle. Or it can be used as a raw material for the production of CO2-neutral hydrocarbons.
While several companies are already competing internationally to find the best technology for extracting CO, from the air in large quantities and profitably, the economics still stand in the way of the really big breakthrough : The small proportion of CO, in the atmosphere (0.04%) requires enormous amounts of air to be pumped through the filters in order to filter out a significant proportion of CO,. Separating the absorbed carbon dioxide from the filters in turn requires larger amounts of thermal energy. Economic operation is not possible under current conditions. In the further development of CO, separation from air, it will therefore be necessary to turn several screws to increase the technological efficiency of the process white minimizing energy consumption. |
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Cellulose fibers against climate change in CHEMICAL FIBERS INTERNATIONAL, (10/2021)
