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Encyclopedia > Yellow grease

Yellow grease is a term from the rendering industry. It usually means used frying oils from deep fryers and restaurants' grease traps. It can also refer to lower-quality grades of tallow from rendering plants. Rendering is an industrial process that converts waste animal tissue into stable, value-added materials. ... It has been suggested that this article or section be merged with vegetable oil. ... Tallow is rendered beef or mutton fat, which was originally suet. ...


Yellow grease is recovered, traded as a marginally valuable commodity, and has traditionally been used to spray on roads as dust control, or as animal feed additive. But waste restaurant grease has recently become more desirable as one source of biodiesel fuel for cars. Although most biodiesel is developed from renewable plant sources, namely soybeans, yellow grease is attractive because it's cheap, it turns waste into fuel, and the exhaust smells like french fries. Biodiesel sample Biodiesel refers to diesel-equivalent biofuel usually made from vegetable oils or animal fats. ... Binomial name Glycine max Soybeans (US) or soya beans (UK) (Glycine max) are a high-protein legume (Family Fabaceae) grown as food for both humans and livestock. ...


According to a study by Dr. K. Shaine Tyson of the National Renewable Energy Laboratory in Golden, Colorado, the US produces enough yellow grease annually to make 500 million gallons of biodiesel. The National Renewable Energy Laboratory (NREL), located in Golden, Colorado, as part of the U.S. Department of Energy, is the United Statess primary laboratory for renewable energy and energy efficiency research and development. ... Downtown Golden, Colorado Golden, Colorado lies at the mouth of Clear Creek at the edge of the foothills of the Front Range. ...


"SVO" (straight vegetable oil) refers to any vegetable oil that can fuel diesel engines, but has not been chemically optimzed through transesterification for use in lower temperatures. "WVO" (waste vegetable oil) refers to yellow grease, the kind that comes from restaurants, and usually has to be filtered to remove food particles. Confusingly, yellow grease falls in the category of SVO/WVO, although restaurant waste grease can be assumed to contain beef tallow and other animal products. // Definition Straight Vegetable Oil (SVO) is a fuel for diesel engines that can be either pure new vegetable oil or Waste vegetable oil that has been cleaned, although this is normally referred to as WVO. The most noticeable difference between an engine running on diesel and SVO is that latter... In organic chemistry, transesterification is the process of exchanging the alkoxy group of an ester compound by another alcohol. ... Waste Vegetable Oil (WVO) is vegetable oil that has become unfit for food preparation. ... Tallow is rendered beef or mutton fat (suet). ...


See also

Biodiesel sample Biodiesel refers to diesel-equivalent biofuel usually made from vegetable oils or animal fats. ... Waste Vegetable Oil (WVO) is vegetable oil that has become unfit for food preparation. ...

External links

  • "Grease Rustlers" by Susan McCarthy. Salon.com, November 6, 2000.

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