Mitsui Chemicals Launches Microwave-Based Direct Monomerization Project for Plastic Waste

Microwave Chemical Co. Ltd. (Suita, Osaka Prefecture; CEO: YOSHINO Iwao) and Mitsui Chemicals, Inc. (Tokyo: 4183; President & CEO: HASHIMOTO Osamu)have launched a new initiative aimed at commercializing the use of microwave technology in the chemical recycling of plastic waste. The project involves directly producing raw monomers from plastics that have conventionally been tricky to recycle, including automotive shredder residue (ASR) – a mixture of principally polypropylene-based plastics – and thermosetting sheet molding compound (SMC), which is used in bathtubs and vehicle parts.


Since entering into a strategic partnership in 2017 to promote joint development of next-generation chemical process technologies, Mitsui Chemicals and Microwave Chemical have built up a solid relationship, including through partial equity investment. The two companies are together looking at leveraging microwave technology for a variety of chemical processes.


This new initiative is an attempt to commercialize a chemical recycling technique that uses the PlaWaveTM microwave-based plastic degradation technology developed by Microwave Chemical to directly break down ASR and SMC products into raw monomers. As it eliminates an intermediate step, direct monomerization is a more efficient means of recycling plastic waste into plastic than the conventional approach, which involves turning the waste into oil before monomerization. The technique also promises to reduce CO2 emissions through the use of electricity generated from renewable energy to power the decomposition process.

With initial deliberations having yielded positive results, the project will proceed to verification using Microwave Chemical’s bench-scale equipment before the end of fiscal 2021. A move to full implementation will be then be considered with the objective of promptly commencing demonstration tests.


We are going to accelerate the commercialization through joint development with each company in order to promote the introduction of microwave technology into any chemical process as a key technology for realizing carbon neutrality with microwaves.

Microwave Chemical’s facility



Microwaves are an electromagnetic wave which is frequently used for microwave oven and communication applications, which can transfer energy to materials directly and selectively.  As microwaves can be generated from renewable energy sources, this technology is environmentally friendly, which promotes a reduction of CO2 emissions.


About Our Chemical Recycling

Microwave Chemical has published the "C NEUTRALTM 2050 design" as a concept to lead the realization of carbon neutrality by 2050.

In the field of chemical recycling, which is one of our areas, we will enable green plastic circulation by using decarbonized power sources such as renewable energy. We named our proprietary microwave plastic depolymerization technology as "PlaWaveTM". We are going to build a large-scale pilot plant with a scale of several hundred tons per year in the fall of 2022, and scale up to 10,000 tons per year by around 2025.



Microwave Chemical

Established in 2007, Microwave Chemical is technology-based startup which is enhancing and improving conventional manufacturing processes by utilizing microwave technology to develop new materials, which are difficult to produce with conventional manufacturing methods. The technology is applicable to a wide range of regions such as pharmaceuticals, electronic materials, food and fuel, and the company has ongoing collaborative R&D and commercialization projects with domestic and foreign companies.

For realizing carbon neutrality of the industrial sector by 2050 through the expansion of the manufacturing processes using microwaves, Microwave Chemical is developing a concept named “C NEUTRALTM 2050 design”.

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〒565-0871 Photonics Center 5F, 2-1 Yamadaoka, Suita, Osaka
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