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Home > News > Recycling

New way developed by scientists for recycling plant-based plastics

Source：Adsale Plastics Network Date ：2020-02-13 Editor ：VC

Scientists have developed new way to break down plant-based plastics into their original building blocks, potentially allowing products to be recycled repeatedly without a loss in the quality of the plastic.

 

One of the problems with current plastic recycling methods is that they end up lower quality plastic with worse properties than the original. This means that plastic drinks bottles cannot simply be recycled into new drinks bottles continuously, but instead are used for other lower grade products such as water pipes, park benches and traffic cones.

 

Now scientists from the Universities of Bath and Birmingham have developed a new way of chemical recycling - converting plastics back into their constituent chemical molecules - so that they can be used to make new plastics of the same quality as the original.

 

The team’s method, published in ChemSusChem, uses lower temperatures and more environmentally-friendly catalysts than previous methods.

 

Professor Matthew Jones, from the Centre for Sustainable & Circular Technologies at the University of Bath, said: “Most plastic is currently recycled using mechanical methods, where they are chipped into granules and melted down before being molded into something new.”

 

“The problem is, melting plastic changes its properties, and reduces the quality, which limits the range of products in which it can be used,” he explained. “Our method of chemical recycling overcomes this problem by breaking down plastic polymers into their chemical building blocks, so they can be used all over again to make virgin plastic without losing any properties.”


Recyclables_S_web.jpg

 

The researchers recycled plant-based PLA, which is made from starch or crop waste instead of petrochemicals, and is used in “biodegradable” food packaging and disposable cutlery and cups.

 

PLA isn’t currently recycled because it’s not used widely yet, however with growing awareness of plastic pollution, the demand from consumers for recyclable packaging is growing.

 

The team has also started trialing a similar process for recycling PET, which is used for drinks bottles.

 

First author of the paper, Dr Paul McKeown from the University of Bath, said: “PLA is being increasingly used as a sustainable alternative for single-use plastics. Whilst it’s biodegradable under industrial conditions, it doesn’t biodegrade with home composting, and isn’t currently recycled, so at the moment it commonly ends up contributing to the tonnes of plastic waste in landfill and oceans.”

 

“There is no single solution to the problem of plastic waste, the approach has to be a combination of reducing, reusing and recycling. Our method of chemical recycling could allow carbon to be recycled indefinitely - creating a circular economy rather than digging more up from the ground in the form of fossil fuels, or releasing it into the atmosphere as a greenhouse gas,” he continued.

 

So far, the technology has only been demonstrated on a small scale, however collaborators at the University of Birmingham are now working to scale up the system to produce larger quantities of starting chemicals.

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Source：Adsale Plastics Network Date ：2020-02-13 Editor ：VC

Scientists have developed new way to break down plant-based plastics into their original building blocks, potentially allowing products to be recycled repeatedly without a loss in the quality of the plastic.

 

One of the problems with current plastic recycling methods is that they end up lower quality plastic with worse properties than the original. This means that plastic drinks bottles cannot simply be recycled into new drinks bottles continuously, but instead are used for other lower grade products such as water pipes, park benches and traffic cones.

 

Now scientists from the Universities of Bath and Birmingham have developed a new way of chemical recycling - converting plastics back into their constituent chemical molecules - so that they can be used to make new plastics of the same quality as the original.

 

The team’s method, published in ChemSusChem, uses lower temperatures and more environmentally-friendly catalysts than previous methods.

 

Professor Matthew Jones, from the Centre for Sustainable & Circular Technologies at the University of Bath, said: “Most plastic is currently recycled using mechanical methods, where they are chipped into granules and melted down before being molded into something new.”

 

“The problem is, melting plastic changes its properties, and reduces the quality, which limits the range of products in which it can be used,” he explained. “Our method of chemical recycling overcomes this problem by breaking down plastic polymers into their chemical building blocks, so they can be used all over again to make virgin plastic without losing any properties.”


Recyclables_S_web.jpg

 

The researchers recycled plant-based PLA, which is made from starch or crop waste instead of petrochemicals, and is used in “biodegradable” food packaging and disposable cutlery and cups.

 

PLA isn’t currently recycled because it’s not used widely yet, however with growing awareness of plastic pollution, the demand from consumers for recyclable packaging is growing.

 

The team has also started trialing a similar process for recycling PET, which is used for drinks bottles.

 

First author of the paper, Dr Paul McKeown from the University of Bath, said: “PLA is being increasingly used as a sustainable alternative for single-use plastics. Whilst it’s biodegradable under industrial conditions, it doesn’t biodegrade with home composting, and isn’t currently recycled, so at the moment it commonly ends up contributing to the tonnes of plastic waste in landfill and oceans.”

 

“There is no single solution to the problem of plastic waste, the approach has to be a combination of reducing, reusing and recycling. Our method of chemical recycling could allow carbon to be recycled indefinitely - creating a circular economy rather than digging more up from the ground in the form of fossil fuels, or releasing it into the atmosphere as a greenhouse gas,” he continued.

 

So far, the technology has only been demonstrated on a small scale, however collaborators at the University of Birmingham are now working to scale up the system to produce larger quantities of starting chemicals.

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New way developed by scientists for recycling plant-based plastics

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