Air Products announced the signing of a new long-term oxygen and nitrogen supply agreement and will build a new air separation unit (ASU) and refurbish its existing ASU and liquefier at its facility in Granite City, Ill. The new 500-ton/day ASU, scheduled to be on-stream in the second quarter of 2012, will provide additional capacity for meeting both on-site customer demand for gases and merchant liquid products in the region.