Daqing Petrochemical’s 30,000 t/a POE Plant Completes Start-Up with USEON’s Large-Scale Devolatilization System

According to Daqing Petrochemical, on September 23 its 30,000 t/a polyolefin elastomer (POE) industrial demonstration plant was run through the complete process and produced POE pellets, a start-up achieved at the first attempt. On September 26, the product was confirmed to be on specification.

Construction of the project began in July 2025 and took 13 months. It is an important industrial demonstration project in PetroChina’s move into high-end polyolefin materials, and with it the complete solution-process POE technology developed in-house by PetroChina has been put into industrial operation for the first time.

Successful First Commissioning of the Pelletizing Extrusion System

In July 2025, USEON received the notice of award for the project and took on the design and manufacture of the large twin-screw devolatilization extrusion pelletizing system.

On July 25, 2026, the extrusion pelletizing system passed its trial run at the first attempt, which allowed the downstream sections, including pellet conveying and the pneumatically fed silos, to be put through ahead of schedule. In September, when the whole POE plant was run through and produced on-specification product, the system went into operation as part of the complete industrial process.

China’s First Domestically Developed Large-Scale Continuous Devolatilization System

The large-scale continuous devolatilization system is built around a twin-screw devolatilization extruder. It also includes the melt gear pump system, screen changer, underwater pelletizing system, hot oil system, BCW system, chilled water system, side extruder system, stripping agent system, anti-blocking agent dosing system, antioxidant dosing system, and vacuum condensation and recovery system.

Solution-process POE has to be handled continuously as a highly viscous material with a high solvent content. The system therefore covers devolatilization, melt conveying, filtration, extrusion pelletizing, vacuum condensation and recovery, and the related process auxiliaries. With the plant run through its complete process and producing on-specification product, the engineering capability of domestically developed large-scale continuous devolatilization equipment in industrial POE production has been verified once more.

Building Experience in Industrial-Scale POE Production

From Sinopec’s first 50,000 t/a industrial POE plant, to PetroChina’s 100,000 t/a POE plant, and now Daqing Petrochemical’s 30,000 t/a POE industrial demonstration plant, USEON has taken part in one large POE industrialization project in China after another, building engineering practice in large-scale continuous devolatilization, extrusion pelletizing and polymer finishing.

Carrying out projects at different plant capacities and under different process conditions has added to USEON’s engineering experience in the continuous processing of high-viscosity, high-solvent polymer systems, in system integration and in stable operation.

For POE and other high-end polymer materials, USEON will continue to advance the engineering application of large-scale continuous devolatilization and polymer finishing equipment, working from material properties, process requirements and the conditions of industrial production.

Part of the project information is taken from the official WeChat account of Daqing Petrochemical.