Trace Carbonyl Sulphide and Phosphine in Ethylene or Propylene, May 2019.1 [AN011]
INTRODUCTION: Organic Sulphur and phosphorus occur naturally in crude oil. Ethylene and propylene are formed from the crude oil during the refining process. As these products are purified trace amounts of sulphur or phosphorus may be carried through the process. During polymerization of these compounds to form polyethylene or propylene, trace sulphur or phosphorus components must be accounted for and kept to a minimum. Any contamination from these
components can poison polymer catalysts and adversely affect the quality of the product polymer. Contaminants routinely monitors by the plastics industry include Carbonyl Sulphide (COS) and Phosphine (PH3).