How a Tiny Filter Can Make Chemistry Greener

In chemistry, we mix ingredients in a large pot to start a chemical reaction. In many chemical reactions, chemists add a small amount of catalyst to make the reaction faster. After the reaction, the products need to be separated. Traditionally, factories often use separation methods such as distillation (similar to boiling water and collecting the vapor). However, these methods consume a lot of energy and may damage sensitive catalyst molecules. Nowadays, an emerging technology called membrane filtration can be used for separation. It works like separating spaghetti from water, but in this case, the ingredients are molecules, so we need much smaller filters—with tiny holes that are too small to be seen with a typical microscope. These filters can operate under mild temperature without heating. This allows materials to be separated and reused with lower energy consumption, less air pollution, and without damaging the catalyst.