Chemical Recycling of Rubber: What Methods Are There and What Are Their Advantages?

Rubber chemical recycling refers to the process of breaking down the high-molecular polymers in waste rubber (scrap tires) into small-molecule compounds or monomers through chemical reactions; unlike mechanical recycling, chemical recycling can achieve molecular-level regeneration of rubber materials and represents the ultimate technological pathway for scrap tire recycling.

I. Methods of Rubber Chemical Recycling

Currently, the mainstream methods of rubber chemical recycling include pyrolysis, catalytic cracking, supercritical fluid depolymerization, microwave pyrolysis, and enzymatic depolymerization, among which tire pyrolysis technology is the most mature rubber chemical recycling method today due to its high maturity, widespread industrial application, and optimal economic performance.

Pyrolysis technology generally produces high-value-added products such as recovered oil, pyrolysis carbon black, steel wire, and combustible gas through tire pyrolysis equipment, rather than merely converting "tires into fuel." The advantage of pyrolysis technology lies in its ability to process various types of scrap tires, with controllable product yields and nearly 100% resource utilization.

II. Core Advantages of Rubber Chemical Recycling

Compared with traditional landfilling, incineration, or mechanical recycling, rubber chemical recycling has significant advantages.

1. Thorough harmless disposal. Through high-temperature pyrolysis, chemical recycling can completely decompose or solidify harmful substances in waste rubber (such as polycyclic aromatic hydrocarbons and heavy metals), avoiding soil and groundwater pollution caused by landfilling and eliminating the emission of toxic gases such as dioxins produced by incineration. The entire pyrolysis process is completed in sealed equipment without generating secondary pollution.

2. High-value resource recovery. A single scrap tire can yield recovered oil, recovered carbon black, steel wire, and combustible gas through chemical recycling. The comprehensive value of these products is far higher than that of rubber powder or reclaimed rubber produced by simple crushing. Recovered oil can be used as industrial fuel or further refined into gasoline and diesel, while recovered carbon black can replace a portion of virgin carbon black in tire manufacturing and other industries, achieving a "tire-to-tire" closed loop.

3. Significant environmental benefits. Chemical recycling realizes a reverse supply chain from "scrap tires" to "industrial raw materials": recovered oil re-enters the petrochemical production chain, carbon black materials return to the rubber product manufacturing process, and metal resources are purified and fed into remanufacturing, truly achieving the circular economy goal of "full utilization." It is estimated that processing 10,000 tons of scrap tires through pyrolysis can reduce carbon dioxide emissions by approximately 11,000 tons. As the carbon trading market matures, this carbon reduction benefit can be converted into direct economic returns.

4. Broad feedstock adaptability. Chemical recycling technology can process various types of scrap tires, including passenger car tires, truck tires, engineering tires, and steel-belted tires, demonstrating strong feedstock inclusivity.

III. Niutech Leads the Field of Rubber Chemical Recycling

Niutech is a leading enterprise in China's pyrolysis technology field and a core participant in the global scrap tire chemical recycling track. The company has achieved fruitful results in rubber chemical recycling and established a significant industry-leading position. Its self-developed new-generation large-scale intelligent continuous pyrolysis complete technology and equipment adopts a PLC/DCS automated intelligent control system to monitor and regulate nearly 20,000 technical parameters in real time, achieving long-cycle, highly stable, and continuous operation at a processing scale of tens of thousands of tons. Its scrap tire pyrolysis projects have obtained ISCC certification, becoming a compliant solution under the EU Carbon Border Adjustment Mechanism (CBAM), with pyrolysis products—pyrolysis oil and recovered carbon black (rCB)—approved for entry into the EU high-end chemical market; through the dual-drive model of "equipment sales" and "equipment + operation," it has implemented multiple scrap tire pyrolysis projects globally.