The sound of the blast was described as "deafening, like thunder."
Complaints about the frequency of flaring resulted in a government investigation last year.
One of six explosions blew a 5-by-8-foot hole in the building roof.
Three trailers of volatile organic peroxide burned after Hurricane Harvey-related flooding cut electrical power for refrigeration.
The chemical plant spilled nearly 250 gallons of acrolein.
A polyethylene unit was behind schedule to become operational.
Video on social media shows workers fleeing from the flames.
A silicon hydride emulsion made at a Waukegan, Illinois, chemical plant where four people were killed in a May 2019 explosion can produce hazardous amounts of flammable hydrogen gas under certain conditions, federal investigators revealed Wednesday.
No fatalities and relatively few injuries were the chief blessings for which residents gave thanks after several massive explosions and more than five days of raging fire at the TPC Group petrochemical plant forced many to spend the Thanksgiving holidays elsewhere.
A ruptured filtration filter is the focus of a U.S. Chemical Safety Board investigation into an explosion and fire at a Texas chemical plant in April that killed one person and injured 30 others, an update issued this week states.
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