Polypropylene recycling has a problem: It stinks. Food and other residues are almost impossible to remove entirely from polypropylene, a.k.a the number “5” plastic of grocery-store fame. Those residues - anything from yogurt to garlic, from fish oil to baby food - not only stick to polypropylene, they degrade there and start to smell even worse!
Current polypropylene recycling techniques are more down-cycling than re-cycling. Unless you break down its molecules through a highly energy-intensive refining process, the material can only get a second life as a black trash can or an underground pipe - wherever its smell doesn’t matter.
But a new technique, called dissolution recycling, is changing all that. Dissolution recycling uses a special hydrocarbon polymer solvent under finely controlled conditions of temperature and pressure to eliminate ALL of the contaminants embedded in the plastic.
Ingenious is a new web series from the American Chemical Society about how leading-edge chemistry is taking on the world’s most urgent issues to advance everyone’s quality of life and secure our shared future.
Hosted by Alex Dainis, Ingenious spotlights stories from the front lines of chemistry research and development, where passionate innovators are stepping up to confront problems like pollution, overfishing, sustainability, and personal safety.
Ingenious releases every month.
Ingenious is made with funding and featuring scientists from 3M, Ascend Performance Materials, Baker Hughes, BASF, Dow, DuPont, Procter & Gamble, PPG, Royal DSM, SABIC, Solvay, and W. L. Gore & Associates, none of whom influenced any editorial decisions.
#recycling #polypropylene #plastics
6 сен 2024
