Simplified process flow diagram of the INEOS styrene mass polymerization technology | Source: Ref. nr. 2 in the description

The INEOS continuous mass polystyrene technology is a bulk (solvent-free) free-radical polymerization process for general-purpose polystyrene (GPPS, "crystal" PS) and high-impact polystyrene (HIPS), developed and historically offered for licensing by INEOS Technologies. The reaction train combines two CSTR-type prepolymerization reactors with proprietary agitator designs and a final plug-flow reactor of proprietary design, followed by two-stage vacuum devolatilization with foaming-agent stripping (residual styrene down to 200 ppm), distillative recovery of styrene and ethylbenzene, and melt finishing to pellet. Swing-line operation produces both GPPS and HIPS grades in single lines of 60,000–200,000 tpy with a 60% turndown capability.

The technology's lineage traces to BP Chemicals: BP's petrochemicals business (Innovene) was acquired by INEOS in 2005 in a "transformational acquisition", and INEOS Technologies was formed from the restructuring of Innovene in the same year. By 2010, nearly 1.3 million tpy of world-scale capacity had been awarded through seven projects using the INEOS proprietary technology. Since September 2025, INEOS Styrolution's Antwerp operations also process chemically recycled styrene monomer supplied by Indaver's depolymerisation plant, 10 km from the Zandvliet site, demonstrating integration of recycled feedstock with the company's mass polymerization operations.

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#styrene  #polystyrene  #masspolymerization  #gpps  #hips  #eps  #INEOS  #sbr  #polybutadiene