en.Wedoany.com Reported - A specialized adsorbent developed by Evonik can triple the removal of chlorides from pyrolysis oil compared to conventional solutions, a technology aimed at improving the quality of key intermediate products in the chemical recycling of plastics.

During the pyrolysis process, plastic waste is decomposed into chemical building blocks under high temperature and oxygen-free conditions. The resulting pyrolysis oil can partially replace fossil feedstocks such as naphtha derived from crude oil in steam crackers to produce ethylene and propylene. However, impurities in pyrolysis oil, including chlorine, nitrogen, and silicon, can jeopardize the operational efficiency and safety of cracking units. Hendrik Rasch, Head of Circular Packaging and Plastic Recycling in Evonik's Next Generation Market Program, stated that cracker operators have strict quality standards for feedstocks, and the company's products are specifically designed to significantly enhance the quality of pyrolysis oil.

Evonik began developing pyrolysis oil purification technology several years ago, leveraging its expertise in petrochemical and feedstock processing. Its Purocel product line offers adsorbents specifically designed to remove impurities from pyrolysis oil. Among them, the Purocel 505 product achieves purification in two steps: first, catalytic reactions separate chlorine atoms from large molecules, and then the generated hydrogen chloride is fixed. Test data show that this technology triples the chloride removal capacity compared to conventional solutions.

For more demanding applications, Evonik introduces a hydrotreating process, where hydrogen reacts with remaining impurities to form volatile compounds, enhancing adsorption efficiency. In this process, the company uses recycled Purocel H catalysts to conserve resources. Additionally, Evonik offers modular systems, launching pre-configured tower modules (filled with adsorbents such as Purocel 510) through "rocket technology," which can flexibly connect pyrolysis units with steam crackers, achieving efficient purification without significant investment or prolonged downtime.

Hendrik Rasch stated that this solution demonstrates how technological innovation can drive the circular economy, emphasizing that chemical recycling is a key pillar of a sustainable plastics economy. Currently, global demand for chemical recycling is growing, driven by regulatory frameworks. Evonik positions itself as a systemic partner, offering customized solutions ranging from small pyrolysis units to large petrochemical complexes. By utilizing pyrolysis oil, companies can reduce their dependence on fossil resources, lower environmental impact, and enhance supply security.

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