Chinese private-sector producer Hengli Petrochemical achieved on-specification production today at the 720,000 t/yr styrene monomer (SM) unit at its Dalian complex.
This comes shortly after its upstream 1.5mn t/yr ethylene unit came on stream at the end of January, while its upstream benzene unit has been operational since the final quarter of 2019.
The start-up of Hengli's SM and Zhejiang Petrochemical's SM units are the most watched by market participants globally as they are now the two newest and largest SM producers.
Zhejiang's 1.2mn t/yr unit, located on Zhoushan island just off east China's Zhejiang province, achieved on-specification production around the end of January or early February. It is currently operating at around 70pc.
Demand for SM in China has slumped since the end of January as transportation curbs and quarantine measures to curb the spread of the coronavirus created logistics bottlenecks, forcing consumers to either slash production or remain shut. Commercial inventories of SM in east China have risen back to historical high levels of about 270,000t, as SM cannot be delivered to consumers outside of Jiangyin and Zhangjiagang where most SM commercial tanks are located.
SM prices have been at a near 11-year low since early February. SM producers have been cutting production to minimize production losses and balance out the sudden emergence of excess supplies.

