Nalco/Exxon Energy Chemical Company
Since the products are manufactured in broad category, the reactor trains are washed after each product type is made. Xylene, a chemical listed on the Toxics Release Inventory (TRI), was used in large quantities as a solvent to clean reactors and in production. As part of the planning process, Nalco/Exxon identified xylene as a top priority for reduction and set a goal to eliminate xylene as a solvent.
In 1993 the xylene solvent started to be replaced with Isopropyl Alcohol (IPA), which is not a TRI chemical. By 1996 Nalco/Exxon had successfully replaced all xylene used as solvent. IPA proved to be less efficient than xylene, requiring a larger volume of IPA solvent than the previous xylene amount. Nalco/Exxon has since gone beyond the planning requirements to look for ways to reduce the amount of IPA used.
Switching to Isopropyl Alcohol solvent:
- reduced worker exposure to toxic chemicals and TRI releases and transfers.
- resulted in a reduction of almost 50 tons of xylene waste in 1996.
Details of Reductions
Additional Information :
Nalco/Exxon has reduced its liability due to reduced worker exposure to toxic chemicals. The employees recognize the benefits of this change and support continuous improvements in waste elimination and reduction.