Conoco Inc. has pressed into service a new $50 million low sulfur diesel hydrotreater at its Ponca City, Okla., refinery, to meet sharply higher demand for low sulfur diesel fuel in the U.S. The increased demand stems from new environmental regulations calling for reduced sulfur levels in on-highway diesel beginning Oct. 1 (see related story, this page). The Ponca City refinery shipped its first batch of low sulfur diesel to Midcontinent customers in early September, almost 2 months before it held a ribbon-cutting ceremony to unveil the new hydrotreater. The plant responded to reports of spot shortages of low sulfur dies...

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