Propylene is a fundamental building block in the polymer industry, forming the basis for polyethylene, polypropylene, and other essential plastics. However, the production of polymer-grade propylene requires an exceptionally high level of purity, with stringent limits on trace contaminants. Among the most problematic are carbonyl sulfide (COS) and mercaptans (RSH), which can significantly impair the performance of polymerization catalysts and affect the final product’s quality. NINGBO INNO PHARMCHEM CO.,LTD. offers specialized solutions for this critical purification challenge.

The removal of COS to parts-per-billion (ppb) levels is a complex undertaking. Traditional methods often fall short, necessitating the use of highly effective adsorbents and catalysts. Copper oxide-based or zinc oxide-based formulations, designed for low-temperature applications, are commonly employed. These catalysts work by chemisorption or catalytic conversion of COS into less harmful substances, or by direct adsorption. Similarly, mercaptans, a group of sulfur-containing organic compounds, must be meticulously removed. Advanced catalysts provide the high capacity and selectivity needed to achieve the required purity levels in propylene streams.

Beyond COS and mercaptan removal, these streams often contain other impurities like hydrogen sulfide (H2S) and potentially arsenic compounds. Catalysts that can simultaneously address multiple contaminants, such as copper oxide-alumina variants, offer an efficient and cost-effective approach. The careful selection of a catalyst or adsorbent, tailored to the specific composition of the propylene stream and the downstream process requirements, is key to ensuring consistent product quality and operational efficiency. For manufacturers aiming for the highest standards in polymer production, investing in effective purification technologies is non-negotiable.