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ExxonMobil Chemical Plant (286), Baton Rouge

LDEQ Accident Report

Accident #149351
PDF AvailablePDF
State Police #13-02817
Accident Date2013-06-25
Report Date 2013-07-03
Follow-up Date 0000-00-00
Follow-up: No

Pollutants Released

Pollutant Duration Point Source Greenhouse Gas Criteria Pollutant Ozone forming chemical Amount of Release
1,3-Butadiene25h 10mWILA unitNONOYES2,100.0 pounds
Benzene25h 10mWILA unitNONOYES33.0 pounds

Accident Classified As: Reportable Quantity

Cause of Problem: Instrument Failure

ON June 25, 2013, the Baton Rouge Chemical Plant WILA unit experienced a series of intermittent PV vent liftings on TK 8 & 9. This event was due to level instrument malfunction on a water/butadiene separation drum during startup of the BELA-5 unit caustic scrubber system. As a result, butadiene was sent to the WILA unit. The butadiene vaporized in TK 8 & 9 causing elevated pressures, resulting in the PV vent liftings. The source of butadiene was immediately stopped and the WILA feed line was purged of butadiene to the flare system. Approximately 33 pounds of benzene and 2100 pounds of 1,3-butadiene were released as a result of the event.

Discharge Preventable - Yes

Notes/Remedial Actions

The source of butadiene was stopped and the WILA feed line was purged of butadiene to the flare system. Repaired level instrument/control valve. Repaired site glass to restore visibility and enable confirmation of level instrument reading. Conducted refresher training for the process organization on improved alarm response to low level readings.