Chicken fat could be new biodiesel

FAYETTEVILLE, Ark., Dec. 19 (UPI) -- Researchers in Arkansas are looking at ways to convert chicken fat into biodiesel fuel.

Chemical engineers at the University of Arkansas were successful in using so-called supercritical methanol to transform chicken fat and tall oil fatty acid into biodiesel fuel, the university said Wednesday in a news release. The yield was greater than 90 percent, the university said.

Graduate student Brent Schulte subjected low-grade chicken fat and tall oil fatty acids to a chemical process known as supercritical methanol treatment. Substances become "supercritical" when they are heated and pressurized to a critical point, the highest temperature and pressure at which the substance can exist in equilibrium as a vapor and liquid.

"The supercritical method hit the free fatty-acid problem head on," chemical engineering professor R.E. "Buddy" Babcock said. "Because it dissolves the feed material and eliminates the need for the base catalyst, we now do not have the problems with soap formation and loss of yield. The supercritical method actually prefers free fatty acid feedstocks."