It is a "small handful" of lookers, Meehan said.
The oil companies announced in September plans to sell or close their refineries in the Philadelphia area, citing deteriorating market conditions for fuel.
ConocoPhillips is shutting down its plant in Trainer by the end of the year. Sunoco announced this month that it would shut down its Marcus Hook plant immediately and would not keep its Philadelphia refinery open later than July.
Public officials have rallied support to keep the plants open and to try to find a buyer. "We're all standing by to help if there's any way we can," said U.S. Sen. Pat Toomey, a Republican.
U.S. Rep. Bob Brady (D., Pa.) and labor leaders were annoyed that the oil companies sent midlevel representatives who were unable to provide much detail.
"We're not talking to the top people of Sunoco or Conoco," Brady said. "That's wrong."
Sunoco spokesman Thomas P. Golembeski, who was not present at Monday's meeting, said the company was bound by nondisclosure agreements and unable to offer many details about potential buyers. Tactically, the company also does not want to tip its hand with potential buyers.
"Selling a refinery is a complex undertaking," he said. "It takes time."
Some officials are still sore at Sunoco for its surprise announcement this month to shut down Marcus Hook now rather than waiting until July.
Golembeski said the Philadelphia company lost more than $800 million refining oil since 2009, almost a million dollars a day for three years. "To continue operating Marcus Hook," he said, "potentially threatens the company."
The local refineries are considered difficult to sell because whoever buys them will face the same challenges as the current owners. The plants are designed to use more-expensive, low-sulfur, "sweet" crude oil, which makes them unprofitable for a company like Sunoco, which buys its crude oil on the open market. Upgrading the refineries to make them more complex would require potentially billions of dollars of investment.
Industry experts say the plants might interest an oil producer that has its own sources of sweet crude.
"Our objective first and foremost," said Meehan, "is to continue keeping these refineries operating in the refining of oil."
But the refineries might also be converted into another industry. Sunoco chief executive officer Lynn Elsenhans has suggested that a chemical producer using Marcellus Shale natural gas as a raw material might be interested.
"We're considering all options, including alternative uses for the sites," Golembeski said.
Sunoco's pipeline affiliate, Sunoco Logistics L.L.P., might retain some fuel-tank storage and dock facilities.
Contact staff writer Andrew Maykuth at 215-854-2947, firstname.lastname@example.org, or @Maykuth on Twitter.