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"Durable and environmentally friendly chemical products are a key enabler for the development of many downstream industries," he said.

"Demand is set to decline by amounts never before seen driven by the COVID-19 global economic shock," Kurt Hallead, co-director of RBC's global energy research unit told CNBC.

"Everything went crazy at that point," Cox said, expressing sympathy for employees. "It's just hard to believe what happened here, but it seems like it's happening everywhere."

"Everything looked so sad to me — the color of the sky, the shade of the trees and the deserted streets. I thought the day must remain in the history of China as the day of sorrow," he wrote in his diary.

"Even though the West likes to think China is not innovative, they are innovative in a different way, much more market-driven, more application-driven," Walker said.