BASF saw a process upset Tuesday at its oxo-alcohols complex in Freeport, Texas, a Wednesday filing with state regulators showed.
"Due to a flow transmitter plugging, the unit automatically shut down," BASF said in its filing with the Texas Commission on Environmental Quality.
"The unit was returned to normal operations," the company added.
The emissions associated with the process upset included flaring of 527 lb of propylene and 1,340 lb of butyraldehyde. The flaring was said to have run through Wednesday morning.
BASF's Freeport site can produces two main types of oxo alcohols -- butanols and 2-ethylhexanol. These products are used as solvents and as intermediate chemicals to make other products such as wood finishes, PVC siding, oils, plastic coatings and herbicides.
