Plastic Recycling Not Requiring Sorting Could Be Coming

What if every piece of plastic waste, like bottles, bags, even clothes, could be rebuilt from scratch, no sorting required? Not just melted and reshaped, but broken down to pure chemical building blocks and made new again. That’s what a new wave of recycling tech promises.

At Northwestern University, a team has built a catalyst that can zero in on a single type of plastic in mixed waste and break it down. No sorting, no problem. In South Korea, a 2,000°C hydrogen plasma torch is cracking mixed plastics in milliseconds, turning them into valuable building blocks for brand-new plastics. And in France, an enzymatic recycling plant is transforming previously unrecyclable polyester textiles back into virgin-quality plastic feedstock.

We’ve been sold the recycling dream for decades, but the reality? Most plastic still ends up in landfills or the ocean. Could these breakthroughs finally turn recycling from marketing lie into working reality?

We were told that most of the plastic in our lives — from yogurt tubs to plastic bags — could be set curbside in a mixed plastics bin, transported to a recycling facility, and returned to us on the shelves of a grocery store. But while recycling bins have become standard since the recycling campaigns of the 80s and 90s, actually recycling that plastic has not. I talk about the plastic industry’s history of fibs in another episode.¹ Today, we’re talking about recent breakthroughs in recycling technology that might finally make a plastics-to-plastics recycling loop possible.

Right now, only about 15% of plastics produced each year get recycled worldwide,²³ and in the US that figure is just 5%.⁴³ Humanity has already produced 8 billion tons of plastic,⁵ and most of it is still with us. If not within us.

So why aren’t we recycling? Plastics are made from fossil fuels, which means recycling is always competing on price with freshly pumped oil. Cost is king.

A 2020 McKinsey & Company report estimated that with oil at $60 per barrel, only about 20% of plastics by volume would make back enough money for private investors to risk building out recycling facilities.² And that report landed just as the COVID pandemic sent already-volatile oil prices into the negative.⁶

Right now, the economics work best for PET, polyethylene terephthalate, ♳ number one in recycling, even though it’s the fourth-most produced polymer.⁷ PET is the clear plastic used for fizzy drinks and water, and it can be washed, remelted, and upcycled into new bottles two or three times before its quality goes flat.⁸ But mechanical recycling, as they call it, struggles with contamination, colors, and labels.⁹

A lot of that recycled PET doesn’t come back as bottles at all. It’s downcycled into polyester for fleece and athletic wear.⁹ But there’s only so many Patagonia half-zips a person can use. And, eventually, it all ends up in a landfill.

Today’s best recycling practices still can’t “close the loop.” We need methods that can reliably turn used plastics into other valuable materials, or even “virgin” quality feedstock for new plastics. And we need to tap into the biggest fraction of plastic waste: mixed polyolefins.

The Polyolefin Problem

About 60% of global plastic production⁵¹⁰ falls into three polyolefin plastic codes: the cloudy high density polyethylenes, or HDPE, the flexible low density polyethylenes, or LDPE, and the tough-guy polypropylenes, PP…which, yes, still makes scientists giggle in meetings.

The chemical similarity between PP and both types of PE means they have almost the same density. So in recycling plants, when plastic is ground into flakes, washed, and separated by density, they float or sink together. That imperfect sorting often drags in unwanted hitchhikers like PVC, or polyvinyl chloride.⁹ Heat that, and its chlorine atoms pop off as corrosive hydrogen chloride gas, which is enough to jam up most recycling processes.¹¹

We churn out about 220 million tons of polyolefins every year, and production is on track to quadruple by 2050.⁵ We’ve recycled hardly any of them, mostly because we can’t cleanly sort one from another.⁵ But new chemical recycling technology might finally change that.

Nickel Catalyst Breaks Through

Led by professor Tobin Marks, a team at Northwestern University has developed a method to chemically sort PP from PE. It’s a precision-tuned form of hydrogenolysis, using hydrogen gas and a catalyst to “crack” the long chains of carbon atoms that form the backbones of plastic polymers.¹¹

Why hydrogen? Breaking bonds in a plastic polymer leaves behind unstable fragments that can snap back together in all sorts of random ways. Hydrogen caps the fragments’ loose ends, stabilizing them and steering them toward a predictable set of end products — and predictability is everything when you’re trying to turn trash plastic into something valuable.

And the catalyst? It acts like a reaction whisperer: it makes the chemistry happen faster, but it doesn’t get used up. And because catalysts can be tuned to target specific bonds, they’re what turns a chaotic breakdown into a process you can actually build a recycling system around.

What makes Northwestern University’s hydrogenolysis so special is that its catalyst snips only PP plastics. The catalyst targets carbons near PP’s chemical side groups that act like knots along a rope, making the plastic’s backbone just a little weaker at each one.¹¹ And PE plastic? It’s left untouched. But with PP cut into pieces, PE is effectively sorted out and can be recycled separately.

Not only is Northwestern’s catalyst specific to just one polyolefin plastic, but it’s dirt cheap. Most catalysts are made from noble metals like platinum and palladium, but this one? It’s nickel.¹¹ Not even dime.

Its activity is 10X higher than other nickel-based catalysts, and it does its job at just 200 C (about 400 F), which is 100 C cooler than other catalysts.⁵¹² Those low temps lead to big energy savings.

And when the catalyst eventually wears out, it’s not done. It can be regenerated at least three more times with a cheap treatment ¹¹ while still retaining over half its original activity.¹²

It gets better. Most catalysts get shut down by PVC contamination, but this one keeps on going… even when the mix contains up to 25% PVC.¹¹ In fact, PVC actually boosts its activity. That means batches of messy, mixed plastic waste that would’ve been destined for landfill or incineration suddenly become recyclable.

The catch? This process doesn’t turn PP back into the basic building blocks for new plastics. It stops at lubricants, fuels, and waxes.¹¹ That’s valuable stuff, but it’s not the closed loop we’ve been promised. The dream of those chasing arrows has always been to turn what’s tossed in the bin back into brand-new plastic. And that’s where a very different approach out of South Korea might change the game.

Plastic v. Plasma

Led by Dr. Young-Hoon Song, researchers at the Korea Institute of Machinery and Materials (KIMM) say they’ve built a super hot, hydrogen plasma torch that can blast mixed plastic waste back into its basic chemical building blocks in less than a tenth of a second.¹³

Plasma is the superheated, ionized gas known as the fourth state of matter, and the same stuff that paints the aurora borealis across the night sky.¹⁴ The torches use just hydrogen — no oxygen — so the plastic doesn’t burn. Instead, hydrogen atoms bond with the ends of broken polymer chains, stabilizing them and steering the reaction toward the small molecules ethylene and benzene.¹³

That’s ethylene as in polyethylene, and it’s a building block not just for PE, but for PET and polystyrene, plus plasticizers, detergents… even antifreeze.¹⁵ Benzene is just as versatile a feedstock, although half of it ends up in polystyrene plastic.¹⁶¹⁷

Maybe the most surprising part of KIMM’s approach is just how clean the output is. Instead of the usual soup of a hundred different byproducts, 70 to 80% of what comes out of the plasma torch is just those two molecules: ethylene and benzene.¹³ And they say more than 99% of that output can be purified into high-quality feedstock for new plastics.¹³ If that performance holds up outside the lab, most of a bale of mixed plastic waste could loop right back into the plastics economy.

The cherry Coke on top is how KIMM says the system doesn’t require strict sorting or even label removal.¹³ The torch can handle a wide range of plastics and contamination. If that pans out in real-world conditions, it could remove two of the most expensive bottlenecks in recycling: sorting and cleaning.¹⁸

But before we can call this a closed loop, there are some loose ends to tie up. Running a plasma torch between 1,000 to 2,000 C (~1,800 3,600 F) takes a lot of energy, and how much that will cost at industrial scale is still an open question. Then there’s the hydrogen hitch: most hydrogen today is still made from fossil fuels without carbon capture.¹⁹ Green hydrogen, which is made by splitting water with renewable electricity, is far cleaner, but currently up to six times more expensive.²⁰ I’ve got a full breakdown of that challenge in another episode if you want to go deeper.²¹

Still, KIMM says the profits from selling the recovered ethylene feedstock made the cost pencil out for their pilot operation. Virgin ethylene sells for $800 to $1,450 per metric ton depending on the market,²² so turning plastic trash back into that raw material could potentially offset the system’s energy costs. A long-term demonstration is planned for 2026,¹³ and if this mixed-plastics plasma torch works as advertised, it could bring us closer to a one-bin-to-rule-them-all solution for plastic waste.

But before we fire up the blowtorch, it’s worth asking if that’s always the right tool for the job. Making plastic is a multistep process, turning simple chemical ingredients into complex polymers, with each step adding time, cost, and chemical elbow grease. Chemically recycling a plastic that only needs melting and reshaping is overkill, like smashing a Lego castle to pieces when all you needed was to move a wall.

Still, mixing in chemical recycling can make the whole system work better. A German study found that diverting scraps from incineration to chemical recycling could actually lower overall costs by about €0.14 per kilogram, or roughly 7 cents per pound (in US dollars). That’s because the chemical products replace some of the need for new virgin plastic, while cutting down on the cost and energy of burning waste.²³

The best value, then, is probably going to be the combo meal: use sorting and mechanical recycling when it’s cheap and makes sense — like we already do for PET soda bottles and even HDPE milk jugs — then switch to chemical recycling to handle what’s left.

But what if those leftovers didn’t need a blast furnace? What if biology could take over, breaking down PET and even polyester clothes into their building blocks, all at low temperatures?

PET 2.0

Carbios is a company I’ve covered before, and I keep coming back to. Not just because their tech promises bottle-to-blazer-to-bottle recycling, but because it’s actually starting to deliver on it.

Carbios uses a process called enzymatic hydrolysis. Enzymes are biological catalysts: dynamic proteins that get work done. And hydrolysis literally means splitting with water.

The enzymes help water molecules cut PET’s long chains apart, turning it back into its original ingredients: terephthalic acid and ethylene glycol.

No high heat, no hydrogen, just warm water, an enzyme engineered to chew up plastic… and a little patience. Over 10 hours, the enzymes break down 90% of the PET inside Carbios’ pilot tanks in Clermont-Ferrand, France, where the vessels look more like they belong in a craft brewery than a recycling plant.²⁴

Those breakdown products are drop-in feedstocks for making new, virgin-quality plastics. And starting in October 2025, a shower gel by the French skincare brand L’Occitane en Provence will be 100% made from Carbios’ enzymatically recycled PET.²⁵

These enzymes aren’t just giving soda bottles a second life. They can take on polyester clothing, too — even those mixed fabrics that stump recyclers. Carbios teamed up with Puma, Patagonia, PVH, Salomon, and On to test their toughest materials: polyester blended with cotton, elastane, dyes, and water-repellent coatings.²⁶

It worked. Carbios’ recycled feedstock became new polyester, spun into fresh fibers, and woven into a plain white T-shirt, even though the original scraps looked like a bag of Skittles.

That’s a huge deal because a polyester is fashion’s favorite fabric, mostly because it’s cheap. But despite the low price tag, it comes with a heavy carbon tab, over twice that of cotton.²⁷ If Carbios can close the loop here, every shirt could be a comeback story instead of a one-hit wonder.

But just because it can be done, doesn’t mean it will.

Carbios is building a plant in Longlaville, France that’ll recycle 50,000 metric tons of PET each year, or roughly 300 million T-shirts’ worth.²⁶ With that scale of recycling under its belt, it plans to license its tech worldwide and already has letters of intent signed in the UK, Turkey, and China.²⁶

What’s it going to take to go from a promising demo to the global standard for PET recycling?

In the extended cut of this video on Patreon, I go over how industry trends and policy changes are finally aligning to make Carbios’ new plant possible.

If recycled terephthalic acid, or TPA, has to compete with virgin material, it’s really up against the cost of crude oil. And that’s a race recycled materials almost never win, because few companies will pay more just to pollute less.

That leaves two paths: either companies like Carbios prove recycling can stay profitable even when oil prices dip, or governments step in to make petroleum-based plastics less attractive — whether through subsidies or penalties. France is peering behind door number 2.

In September 2025, France passed a law offering companies up to a €1,000-per-ton bonus (about $1,170) for using post-consumer recycled plastics. The biggest checks go to those incorporating hard-to-recycle materials, like degraded PET, into new food-grade or sensitive-contact packaging.²⁸ That’s exactly Carbios’ specialty: turning old bottles and clothes into virgin-quality feedstock. These bonuses, along with new minimum recycled-content targets and local-production requirements, all kick in starting January 2026.

Carbios had hit pause on its big Longlaville project, waiting for buyers to step up. But with France rolling out new bonuses and recycled-content rules, the company has inked deals with L’Oréal, L’Occitane en Provence, and a Michelin tire supplier.²⁸

Add another €42.5 million (or roughly $50 million) in funding from the French government, and Carbios is pressing play again. The goal is to start recycling by the second half of 2027.²⁸

Meanwhile, across the Atlantic, plastics aren’t looking so circular. Manufacturers in the U.S. are quietly backing off their recycled-content promises, and a flood of cheap resin imports from Asia is squeezing recyclers out of the market. rPlanet Earth shut down, Brightmark went bankrupt, Evergreen closed its California plant, and Alpek pulled the plug on a major flake facility, all in 2025.²⁹

Spoiler alert: plastic recycling isn’t inevitable. It takes policy, like penalties on virgin plastics and real incentives for recycled ones, to give these emerging industries the lift they need to grow and scale.

Chances are, we’ll need a toolbox of recycling methods, with each one tackling different plastics at different stages of their lifecycle. I’ll be watching to see which ones break into the mainstream. My hunch? Sorting still wins on cost and energy use, keeping the easy, high-value stuff in tight loops. But having a plasma torch in the wings to zap the leftovers…that’s an exciting prospect.

Still, recycling isn’t a get-out-of-jail free card. Every step, from hauling and sorting to washing and reprocessing — it all takes energy. A lot of it. And none of the methods we’ve looked at today are 100% efficient. Some plastic will always be lost along the way, meaning we’ll still rely on new fossil fuel inputs to keep up with demand, and demand is only going up.

Some stuff just shouldn’t be packaged in plastic in the first place. And glass and aluminum can be recycled almost forever.⁸ For single-use items, compostable bioplastics made from mushrooms or even seaweed could help cut our dependence on fresh fossil fuels. I’ve got an episode on plastic alternatives if you want to see how that’s shaping up.³⁰

But plastics still have a place in medicine, transport, and everyday life. And if these new recycling breakthroughs scale, they could finally unlock circularity for plastics destined for the dump.