2025-12-04 産業技術総合研究所
タイヤゴムの2段階ケミカルリサイクル技術の概要
※原論文の図を引用・改変したものを使用
＜関連情報＞
- https://www.aist.go.jp/aist_j/press_release/pr2025/pr20251204/pr20251204.html
- https://pubs.acs.org/doi/10.1021/acscatal.5c05581
タイヤゴムからイソプレンへの2段階化学リサイクル Two-Step Chemical Recycling of Tire Rubber to Isoprene
Wahyu S. Putro,Yoshihiro Ueda,Hiroshi Yamashia,Naoki Kamei,Miftah Faried,Makiko Hatori,Masahiro Hojo,Seiichi Tahara,Masahiro Homma,Takakazu Minato,Katsuhiko Takeuchi,Kazuhiro Matsumoto,Jun-Chul Choi,and Norihisa Fukaya
ACS Catalysis Published: November 21, 2025
DOi:https://doi.org/10.1021/acscatal.5c05581
Abstract
The development of chemical recycling methods for waste polymers and the production of easily recyclable polymers have become important trends in chemical research. Here, we report a two-step chemical recycling method for tire rubber. This method involves cyclodepolymerization (CDP) through the successive ring-closing metathesis of isoprene rubber (reinforced by sulfur cross-linking and a carbon black (CB) filler) and pyrolytic process of the oligomer/polymer into monomeric isoprene. The metathetic process efficiently solubilized the organic components of the tire-like rubber, allowing them to be easily separated from CB without heating. The resulting organic phase consisted of a high-purity isoprene oligomer/polymer (Mn = 1000 Da) whose main product of the cyclodepolymerization was an isoprene cyclic tetramer with cis-, cis-, cis-, and trans-configurations. The pyrolytic fragmentation of the isoprene oligomer/polymer provided the isoprene monomer as the main product along with valuable chemicals such as benzene/toluene/xylene in good yields. This method offers a promising approach for repurposing waste tires as a renewable feedstock.
