When the largest refinery on the East Coast, a facility snugged up to the Schuylkill River in South Philadelphia, sold in July, it immediately became a symbol of the rapidly changing refining trade. The sale ended Sunoco's tenure as a refiner, which had lasted more than a century. The facility is being reorganized by a Carlyle Group (CG)-led partnership to take advantage of low-priced gas flowing out of the Marcellus Shale fields. Its rail