Pennsylvania-based Air Products (NYSE: APD) said Wednesday it has completed the purchase of 32 acres adjacent to Port Manatee to build a manufacturing plant for heat exchangers used in the liquefaction of natural gas. HRK Holdings LLC of Palmetto sold the land. The price was not disclosed in Air Products’ statement and not yet available in public records. Construction of the roughly 300,000-square-foot plant, announced in July, will begin soon and production operations are expected to start by…