Expansion Driven by Growing Interest in Energy Transition Technologies in the Biogas, Aerospace and Marine Industries LEHIGH VALLEY, Pa., May 23, 2024 /PRNewswire/ -- Air Products (NYSE:APD), the global leader in the production of gas separation and purification membranes, today announced it will invest more than $70 million to significantly expand its manufacturing and logistics center in Maryland Heights, near St. Louis, Missouri.The investment, which is Air Products Membrane Solutions' largest ever, is d ...