In-depth Analysis of Chemical Recycling Technologies for Waste Plastics: Technological Evolution and Industrialization Status of Pyrolysis

According to the Chemical Recycling Information Map released in December 2025 by Germany’s Fraunhofer Institute, of the 65 planned projects and 2.799 million tons of planned capacity across Europe, only 18 facilities with a total capacity of 289,000 tons have actually commenced operations—less than 10% of the planned capacity. Meanwhile, nine projects totaling 819,000 tons have been canceled, seven of which were pyrolysis projects. This is not an isolated failure of individual enterprises, but rather a systemic lesson at the level of technological route selection. IV. Industrial Validation of the Two-Step Approach: The Chinese Solution Represented by Hengyu Environmental Protection While overseas one-step pyrolysis projects continue to encounter setbacks, companies adopting the two-step technical route are forging a distinctly different path toward industrialization. Domestically, the enterprise most representative of the industrial maturity of the two-step approach is Hengyu Environmental Protection Co., Ltd. (Stock Code: 688309), a company listed on the STAR Market. Founded in 2006, Hengyu Environmental Protection is led by Chairman Niu Bin—a technologist by background—and has devoted nearly 40 years to solving one singular challenge: achieving stable, continuous industrial operation of pyrolysis technology. According to its 2025 Annual Report, the company’s self-developed “industrial continuous pyrolysis technology” has overcome core technical hurdles—including coke deposition in pyrolysis systems, dynamic sealing during feed-in and discharge-out, and product polymerization—establishing an integrated technical system built upon eight pillars: “heat dispersion, thermal gas-tightness, anti-polymerization, optimal matching of key pyrolysis parameters, low-temperature catalytic cracking, composite flue-gas purification, full enclosure, and proprietary control technologies.” (Source: Hengyu Environmental Protection 2025 Annual Report) Several key metrics merit attention: • Patent Portfolio: As of end-2025, the company holds 134 patents worldwide, including 39 domestic invention patents; it also holds 27 international patents across 12 countries and regions—including the U.S., Canada, and Japan. • Standard-setting Authority: It has led or participated in developing six national standards for pyrolysis technology. • National Recognition: It received the State Science and Technology Progress Award—the only pyrolysis enterprise honored as the primary award recipient in this field. • International Certifications: It has obtained seven major international certifications, including EU CE, German TÜV, ATEX explosion-proof certification, and ISCC carbon certification. More importantly, its industrial validation spans exceptional depth and breadth. Hengyu’s technologies and equipment have been exported to dozens of countries—including Germany, the UK, Denmark, Brazil, South Korea, Hungary, Turkey, Thailand, and Vietnam. Notably, its 2017 collaboration with Norway’s Quantafuel on a waste-plastic pyrolysis project in Denmark attracted strategic investment from global chemical giant BASF and earned high acclaim. This project—featuring four production lines—processes over 100,000 tons of waste plastic annually and has operated stably for more than eight years, representing genuine commercial validation at the 100,000-ton-per-year scale. (Sources: Hengyu Environmental Protection official announcements; China Securities Network reports) In 2025, Hengyu signed a contract with a UK client for a 60,000-ton-per-year waste-plastic pyrolysis production line valued at RMB 198 million; it also concluded its fourth cumulative cooperation agreement with a long-standing European client, with total contract value exceeding RMB 160 million. In the same year, a Southeast Asian waste-plastic pyrolysis project invested by Hyundai Motor Group successfully passed acceptance testing and entered commercial operation—fully equipped with Hengyu’s proprietary technology and equipment. (Sources: Hengyu Environmental Protection announcement dated August 20, 2025; China Securities Journal reports) V. The Underlying Logic of the Technological Route Debate: It’s Not About “Can It Be Done?”—But “Can It Be Done Sustainably?”

Can Solid and Hazardous Waste Only Be Incinerated or Landfilled? Let’s Discuss Pyrolysis-Based Resource Recovery as a New Pathway

After over a decade working in solid waste management, the most striking industry shift I’ve observed is this: landfilling is being phased out, incineration is facing increasingly stringent regulation—and the term “resource recovery” has moved from policy documents into actual tender requirements. This is especially true for organic hazardous wastes—such as oily sludge, waste mineral oil, spent activated carbon, and chemical residues. Simple incineration not only squanders their calorific value but also triggers regulatory pressure due to dioxin emissions. Pyrolysis technology—characterized by “anaerobic cracking + resource recovery”—is rapidly replacing conventional incineration as the mainstream solution. Today, let’s explore the technical logic and engineering realities behind this trend. Traditional Disposal vs. Resource Recovery First, let’s clarify the distinction: | Dimension | Incineration / Landfilling | Pyrolysis / High-Value Recovery | |-----------|----------------------------|----------------------------------| | Essence | “Burn it” or “bury it” | Transform waste into “treasure” | | Secondary Pollution | Incineration emits dioxins; landfills risk leachate leakage | Anaerobic conditions virtually eliminate dioxin generation | | Economics | Pure cost center (RMB 500–5,000 per ton) | Generates revenue via recovered products (oil/gas sales) | | Policy Direction | Landfilling gradually banned; incineration restricted | Explicitly encouraged under the “14th Five-Year Plan” | | Carbon Emissions | Direct CO₂ emissions from combustion | Products displace fossil fuels, delivering carbon-reduction benefits | Fundamental Principle of Pyrolysis Technology In one sentence: heating organic materials in an oxygen-free environment to crack large organic molecules into smaller gaseous, liquid, and solid fractions. Core operating conditions: temperature range of 400–800°C, oxygen-free or slightly positive-pressure atmosphere, residence time of 30–90 minutes. Typical product distribution (using oily sludge as example): • Pyrolysis gas (15–30%): H₂, CH₄, etc.—can be combusted to supply heat back to the system itself; • Pyrolysis oil (20–40%): light hydrocarbons—refinable into fuel or chemical feedstock; • Pyrolysis char/residue (30–50%): usable for activated carbon production, construction materials, or safe landfilling. Crucially, the produced gas can power the system’s own thermal needs, while the oil can be sold—giving pyrolysis projects intrinsic “self-sustaining” economic viability. Three Key Engineering Bottlenecks in Pyrolysis Equipment The principle of pyrolysis is conceptually simple—but its engineering implementation is highly complex. I’ve seen numerous projects that look flawless on paper yet fail to operate reliably on-site; the root cause almost always lies in equipment design and performance. Pain Point 1: Dynamic Sealing Rotary kilns are the most widely adopted equipment type for pyrolysis (offering high throughput and broad feedstock adaptability), yet achieving reliable high-temperature sealing at rotating interfaces remains a global engineering challenge. Seal failure leads to air ingress → oxidation and combustion of organics → safety hazards + drastic drop in thermal efficiency. Industry-standard seal lifespans typically range from just one to three months. Pain Point 2: Coke Prevention Feedstocks rich in asphalt or heavy oils tend to form coke deposits on kiln walls. Once coking occurs → blockages → forced shutdowns for decoking. In severe cases, kilns must be shut down monthly, resulting in extremely low capacity utilization. Pain Point 3: Thermal Self-Balancing If pyrolysis gas yield falls short, the system cannot achieve thermal self-sufficiency and must rely on externally supplied natural gas—eroding the very economic advantage that makes resource recovery viable. High-Value Utilization of Fly Ash—Another Critical Frontier Beyond organic hazardous waste pyrolysis, high-value resource recovery of inorganic hazardous and solid wastes also offers enormous potential. Municipal solid waste (MSW) incineration fly ash is among the largest-volume hazardous wastes in China (national annual output approx. 8 million tons), containing substantial quantities of heavy metals and soluble salts.

BlueAlp Advances Pyrolysis-Based Recycling Projects in EU

14 hours ago

BlueAlp received an invitation for up to €21 million from the EU Innovation Fund for its pyrolysis project in Kampen, alongside plans to expand capacity in Belgium and Rotterdam.

chemweek

2026-11-07

BlueAlp Advances Pyrolysis-Based Recycling Projects in EU

BlueAlp Advances Pyrolysis-Based Recycling Projects in EU

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