DANBURY, Conn.--(BUSINESS WIRE)--The board of directors of Praxair, Inc. (NYSE:PX) has declared a quarterly dividend of 71.5 cents per share, unchanged from the previous quarter. The dividend is payable on September 15, 2015 to shareholders of record on September 8, 2015. The board of directors has also authorized a new share repurchase program for up to $1.5 billion of Praxair’s common stock. Praxair has approximately $500 million of repurchase authority available under its previously announce