ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Extraction of indene from local pyrolysis oil and its usage for synthesis of a cationite

Saidmansur Saidobbozov, Suvonqul Nurmanov, Orifjon Qodirov, Askar Parmanov, Samadjon Nuraliyev, Elyor Berdimurodov, Ahmad Hosseini-Bandegharaei, Wan Mohd Norsani B. Wan Nik, Asmaa Benettayeb, Nabisab Mujawar Mubarak, and Khasan Berdimuradov

Department of General and Oil-Gas Chemistry, National University of Uzbekistan, Tashkent, Uzbekistan

E-mail: elyor170690@gmail.com

Received: 4 May 2024  Accepted: 27 August 2024

Abstract:

Keeping the principles of sustainability in view, this work explores the extraction of indene from pyrolysis oil—a complex by-product of the Ustyurt Gas-Chemical Complex—and its transformation into a novel cationite, highlighting sustainable approaches in chemical engineering and material science. Utilizing advanced analytical techniques, including thermogravimetric analysis (TG), chromato-mass spectrometry, and Fourier-transform infrared spectroscopy (FT-IR), indene was efficiently isolated and characterized. The indene extracted exhibited a principal ion peak at a molecular mass (m/z) of 117.0, confirming its purity and potential for further applications. Following extraction, indene underwent sulfonation and polycondensation with 35% formalin under specific conditions (100–110°C, 30–40 atm), resulting in a cationite with a yield of 71%. This synthesized IESA (indene-based sulfonated aromatic cation exchanger), demonstrated significant chemical–physical properties when compared to commercial equivalents, such as a moisture content significantly lower than the KU-2-8 (29.4% vs. 48–58%), and a dynamic exchange capacity (DEC) competitive with industry standards (472 mmol/m³ vs. 500–520 mmol/m³). The study not only showcases the potential of pyrolysis oil as a valuable feedstock for producing high-value chemical products, but also advances the development of new materials from industrial by-products.

Keywords: Pyrolysis oil; Indene extraction; Cationite synthesis; Ion exchange resin; Sulfonation; Polycondensation

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-024-03671-4

Chemical Papers 78 (15) 8333–8350 (2024)