A Revolutionary Recycling Method for Polyester Using Hartshorn Salt

The world’s second most utilized textile, polyester, has been a longstanding environmental problem due to its low recycling rates and harmful production effects. However, a team of innovative chemists from the University of Copenhagen has brought forward a green, simple, and groundbreaking solution to recycle polyester using Hartshorn salt.

Source: BBC News/YouTube

Polyester, a blend of plastic and cotton, is prevalent in our daily lives, found in everything from clothes to home furnishings. Annually, around 60 million tons of this fabric are produced, yet a mere 15% is recycled, leaving the majority to end up in landfills or incinerators, contributing significantly to carbon emissions. The challenge has been to separate the plastic and cotton fibers effectively without loss, as current recycling methods often result in the wastage of cotton fibers.

The team from the University of Copenhagen has successfully addressed this issue by introducing a method that depolymerizes polyester back into its monomers while simultaneously recovering cotton. This approach is incredibly simple, requiring only heat, a non-toxic solvent, and hartshorn salt – an everyday household item. The process involves heating the polyester material with the solvent and hartshorn salt to 160 degrees Celsius for 24 hours, resulting in a liquid where plastic and cotton fibers separate into distinct layers.

Hartshorn salt breaks down into ammonia, CO2, and water during this process, with the ammonia and CO2 acting as a catalyst for the selective depolymerization reaction. This reaction effectively breaks down the polyester while preserving the cotton fibers, all while being environmentally friendly and safe.

The researchers have expressed excitement about their method’s scalability and are currently in talks with companies to test it on an industrial scale. With this innovative technique, the sustainability of the textile industry takes a significant step forward, opening the door to increased recycling rates and a greener future.

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