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On the afternoon of May 3, Wang Moumou, deputy director of the hydrogenation workshop, arranged the operation of the No. 1 hydrogenation reactor.
The manhole of No. 1 hydrogenator was opened. Wang then gradually opened the vacuum valve on the kettle three times, causing a large amount of air to be sucked into the No. 1 hydrogenation reactor to form an explosive mixed gas with the ethanol vapor in the kettle.