#Recycling / Circular Economy

2023-04-27

Asahi Kasei and Microwave Chemical launch joint demonstration project for chemical recycling of polyamide 66 using microwave-based technology

Asahi Kasei and Microwave Chemical launched a joint demonstration project in April 2023 with the objective of commercializing a chemical recycling process for polyamide 661 (PA66, also called nylon 66) using microwave technology. The process utilizes microwaves to depolymerize2 PA66 and directly obtain the monomers hexamethylenediamine (HMD) and adipic acid (ADA), which is expected to be accomplished at high yield with low energy consumption.

The monomers obtained can then be used to manufacture new PA66. In the demonstration, scraps from manufacturing and post-use waste material of PA66 for airbags and automobile parts are depolymerized.

Asahi Kasei currently produces fossil fuel–derived HMD and ADA as intermediates to manufacture Leona™ PA663, an engineering plastic featuring outstanding heat resistance and rigidity. PA66 is used in various applications, including plastic parts for automotive and electronic products, and yarn for airbag fabric, and its demand is expected to increase worldwide.

As the world moves toward carbon neutrality, attention is increasingly focused on manufacturing processes for reducing greenhouse gas (GHG) emissions from chemical products derived from fossil fuels. Microwave Chemical is promoting technological and business development to achieve carbon neutrality in the industrial sector focused on process development using microwaves, which can directly and selectively heat target substances with high energy efficiency. For chemical recycling, Microwave Chemical is advancing its proprietary PlaWave™ technology platform for decomposing plastic using microwaves.

Through development combining Asahi Kasei's experience in manufacturing HMD and ADA for more than half a century together with Microwave Chemical's achievements in the industrialization of microwave technology, the two companies aim to commercialize a manufacturing process for PA66 that can reduce GHG emissions compared to the conventional manufacturing process.

Laboratory-scale studies that began in fiscal 2021 have confirmed the high-yield depolymerization of PA66 using microwaves, as well as the principle of the separation and purification process after depolymerization. Bench-scale equipment will now be assembled at Microwave Chemical’s Osaka Factory by the end of fiscal 2023, and a small-scale demonstration trial using this equipment will be performed in fiscal 2024 to collect basic process data for commercialization.

Microwave Chemical’s PlaWave™ technology platform for decomposing plastic using microwaves can depolymerize PA66 with low energy and obtain HMD and ADA monomers in high yield. The manufacturing process for PA66 using HMD and ADA obtained by depolymerization with this technology is expected to reduce GHG emissions compared to the conventional PA66 manufacturing process, while further reduction of GHG emissions may be achieved by the use of renewable energy for the power required to generate the microwaves.

By verifying the process from depolymerization to separation and purification in an integrated manner, this demonstration project aims to enable resource circulation of PA66 for further reduction of GHG emissions.

Moving forward, based on the results of the small-scale demonstration trial, a decision on the possibility of commercialization will be made by fiscal 2025 following detailed analysis. Concurrently with the small-scale demonstration trial, construction of a business model that involves the entire value chain in the chemical recycling of PA66 will be advanced, aiming to achieve a circular economy together with stakeholders in the PA66 value chain.

Asahi Kasei aims to be a global partner for its PA66 customers by providing optimal solutions for their carbon neutrality initiatives through studies of the practical application of material recycling and chemical recycling as well as trials for the commercialization of PA66 made using biomass-derived intermediate4.

Microwave Chemical is working to increase the scale of equipment and to make PlaWave™ more generally applicable in order to achieve the practical application of the chemical recycling of polymethyl methacrylate (PMMA, also called acrylic resin), automotive shredder residue (ASR), plastic containers and packaging, flexible polyurethane foam, etc.

1) The main types of polyamide are polyamide 66 and polyamide 6, which have different chemical structures. With superior heat resistance and strength, polyamide 66 is widely used in industrial applications such as automotive and electronics.

2) The opposite of polymerization, depolymerization is the process of breaking down a polymer into a monomer or monomers by heat and other means.

3) Asahi Kasei is a manufacturer of engineering plastics such as polyamide 66, which is made from HMD and ADA, polyamide 6I, and polyamide 612, as well as polyamide 610, which is made based on plant-derived raw materials such as castor oil, and supplies optimal materials suited to various needs ranging from molding materials for automotive and electronics applications, airbag yarn and fabric, and tire cord.

4) Please refer to the press releases dated March 16, 2022:?

Genomatica and Asahi Kasei Partner on Renewably-Sourced Nylon 6,6?

https://www.asahi-kasei.com/news/2021/e220316_2.html

Asahi Kasei to accelerate trials for commercialization of polyamide 66 made using biomass-derived intermediate

https://www.asahi-kasei.com/news/2021/e220316.html

Asahi Kasei Advance to showcase high-performance non-woven and fibers at Techtextil 2026

Asahi Kasei Advance will present its portfolio of high-performance nonwovens, flame-retardant fabrics, and advanced textile and fiber solutions designed for various industries during its first-ever exhibition at Techtextil 2026. Techtextil is the leading international trade show for technical textiles and nonwovens, taking place from April 21-24, 2026, in Frankfurt, Germany. Asahi Kasei Advance will highlight 14 brands, with special focus on four key materials as its debut at the exhibition in Hall 12.1 at booth C35.

ROICA: Where distinction and intention shape the future of apparel industry at Milano Unica

At Milano Unica, held at Fiera Milano (Rho) in Milan from January 20–22, nine select European partners unveil collections shaped by ROICA™—the premium stretch fiber by Asahi Kasei. ROICA™ does not stand alone on the show floor, but its presence is quietly interlaced into each creation, chosen by those who seek distinction and depth in modern textiles. Through these dedicated collaborations, ROICA™ continues to sup-port the apparel industry with advanced stretch, comfort, and environmental care, offering something unique for brands who value true craftsmanship and thoughtful innovation.

Ence and ShareTex begin initial testing of the ATENEA innovation project to promote textile recycling in Spain

Ence and ShareTex are making progress on the Atenea R&D project, which aims to develop a complete value chain for textile recycling in Spain. Specifically, the goal of the ATENEA project—which is funded by the Center for Technological Development and Innovation (CDTI)—is to connect all the necessary stages for the recovery of textile waste, from collection and management, through recycling and transformation into new raw materials, to their incorporation into new textile products.

DePoly Inaugurates its Showcase Plant in Monthey Switzerland

What if used plastic bottles, PET packaging material and polyester textiles could become raw materials just as high performing as virgin resources? That is the ambition of DePoly, a circular materials company based in Sion, Switzerland which inaugurated its Showcase Plant in Monthey on July 6th & 7th. The first depolymerization facility of its kind and scale in Switzerland, this industrial Showcase Plant represents a major milestone in the company's growth and its journey toward commercialization.

Commission clarifies rules on plastic bottles recycling

The European Commission today adopted new rules on recycling of single-use plastic beverage bottles made primarily of polyethylene terephthalate (PET bottles). These rules establish, for the first time, a methodology to calculate, verify and report chemically recycled content. This is part of the Commission’s December 2025 plastics package.

DyStar releases FY2025 sustainability report, marking a new milestone towards its 2030 targets

DyStar, a leading specialty chemicals company with more than a century of expertise in product development and innovation, today announced the release of its FY2025 Sustainability Report, marking a significant milestone in its sustainability journey and reinforcing its commitment to long-term value creation.

TERIS reaches milestone: Fraunhofer consortium develops new standards for tire analysis

In the “TERIS” project, the Fraunhofer institutes ICT, IGD, and IWM—led by the Fraunhofer Institute for Structural Durability and System Reliability LBF—have reached a decisive milestone. For the first time, the teams aim to generate, analyse, and predict tire wear in the laboratory in a standardized and practical manner. As part of this milestone, results are now available on reference abrasion, particle analysis, tribological models, AI-based surface analysis, a test bench concept, and methods for accelerated aging and VOC detection. The tire industry, testing services, and environmental agencies will in future benefit from reliable, rapid laboratory procedures for emissions assessment.