The take-private buyout of TPC Group (NASDAQ: TPCG) by First Reserve and SK Capital Partners isn't a done deal yet. TPC has received a revised non-binding expression of interest to be acquired by Innospec (NASDAQ: IOSP) for $47.50 per share, up from a previously proposed price range of $44 to $46 per share. Equity financing for such a deal would be provided by The Blackstone Group through its Blackstone Capital Partners VI fund. TPC is a processor and service provider of products derived from niche petrochemical raw materials. Earlier this month, the company amended its agreement to be acquired by First Reserve and SK Capital, with the purchase price increasing from $40 per share to $45 per share.