Yellow grease

Such feedstocks include non-refined virgin oils, used cooking oils that commonly have an FFA level of >6% and tallow (6%), yellow grease obtained from rendered animal fat (up to 15% in FFAs) and brown grease obtained mainly from traps installed in commercial, municipal or industrial sewage facilities (>15%). The production of... 

In biodiesel preparation, vegetable oils and animal fats are typically employed as biomass feedstocks, but waste greases such as yellow grease and brown grease can also be used. Thus, biodiesel synthesis provides a means for... 

E.g., Vegetable oil, WVO, animal fat, yellow grease (filtered degummed)... 

Fatty Acid Trivial Name Beef Tallow Mutton Tallow Lard Chicken Fat Choice White Grease Yellow Grease Soy Rape ... 

Grease production data are often lumped with that for inedible tallow. Greases constitute about 45% of this total and are used exclusively in nonedible applications. In the United States, the use of yellow grease in animal feeds is increasing yearly and in 2000 accounted for 36% of total feed fat usage (62). 

Pounds of oil production are a 3-year average (1993-1995) from OH Crops Yearbook, October 1997, USDA, ERS with the followihg exceptions rapeseed was calculated by multiplying oil per acre times the 1993-95 average humber of acres harvested. Number of harvested acres comes from USDA, NASS, January 1996. Inedible tallow and yellow grease supply comes from US. Department of Commerce, Bureau of the Census, Fats and Oils, Production, Consumption and Stocks, Annuai Summaries 1993-1995. 

On a liquid fuel basis, these feedstocks would equal about 3.7 billion gallons of diesel fuel, about 13% of the 28 billion gallons of diesel fuel consumed in the United States for transportation in 1996. If biodiesel was blended with petroleum diesel fuel, e.g., 20% biodiesel and 80% petroleum (B20), the total supply of this blended fuel would be about 18.7 billion gallons, or 67% of U.S. annual diesel consumption. This example uses the total average supply of all crop oils, animal fats, and yellow grease as the available feedstock supply (182). 

Standard Tallow Choice White Grease Yellow Grease Hydrolized AA/ Blend... 

Grease is animal fat with a titer below 40°C. Choice white grease is derived primarily from the rendering of pork offal whereas yellow grease is derived from restaurant grease (4). 

Figure 10. Flow diagram of the production of yellow grease.

Chicken Fat Yellow Grease Choice White Grease Tallow Gulf Menhaden Fish Oi ... 

Chicken fat, yellow grease, choice white grease, and beef tallow are readily available from meat, poultry, and other food-processing operations and are competitively priced relative to No. 2 fuel oil. They represent a potential source of energy at 1.2 therms per gallon. At times, the price of fish oil is so low that producers use the oil as an extender for the fuel oil that is being burned in the plants and some companies... 

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