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LSB Industries Inc. will shut down its chemical manufacturing facility for an indefinite period after a reactor explosion caused significant damage.

LSB said the direct strong nitric acid (DSN) plant, which represents about 20 percent of its El Dorado, AR, facility’s total capacity, suffered damage when a reactor exploded in the morning. There were no injuries related to the incident, the company said.

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The explosion also caused minor damage to the three other acid plants at the facility, Chief Executive Jack Golsen said.

LSB, which makes heating, ventilation and air conditioning (HVAC) and nitrogen-based chemical products, said it cannot estimate the extent of the damages.

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Golsen said it remained unknown how long the El Dorado facility will be out of production as the control room also suffered damage.

The El Dorado plant produces and sells about 470,000 tons of nitrogen-based products per year, according to the company.

LSB, which is investigating the cause of the explosion, said it believes there was no environmental release.

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