28 November 2012 23:31 [Source: ICIS news]
HOUSTON (ICIS)--US acrylonitrile (ACN) producer Ascend Performance Materials reported an emissions event at its Chocolate Bayou plant to the Texas Commission on Environmental Quality (TCEQ), involving an estimated 10lb (4.5kg) of hydrogen cyanide, ICIS learned on Wednesday.
Company personnel did not return phone calls for comments on Wednesday.
According to the report filed with the TCEQ, the emission at Chocolate Bayou Plant, which has a capacity of 70,000 tonnes/year of hydrogen cyanide, lasted just under 11 hours, beginning at 10:00 local time on 27 November.
The plant is located southeast of Houston.
The report said a piping failure on the absorber off-gas line of the acrylonitrile (ACN) 3 unit caused the release of the hydrogen cyanide to the atmosphere.
Plant personnel reduced production rates, the steam was diverted and the line was isolated.
HCN is used with butadiene (BD) to produce adiponitrile, which is a building block for nylon 6,6.
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