LITTLETON, Colo., Nov. 15, 2012 (GLOBE NEWSWIRE) -- Innospec Inc. (Nasdaq:IOSP) today announced that it has increased its non-binding proposal to acquire all outstanding shares of common stock of TPC Group (Nasdaq:TPCG) at an all-cash purchase price of $47.50 per share. The offer continues to be supported by investment funds affiliated with Blackstone Capital Partners VI, L.P. (Blackstone), which will provide equity financing for the transaction.