Restaurant grease

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). 

The animal feed industry is a major user of rendered animal fats, recycled restaurant grease, and cooking oils. Fats are the highest caloric dense feedstuff and foodstuff. In addition, fats and certain of their component fatty acids are essential and indispensable for body functions in addition to their caloric function. The U.S. rendering industry processes about 5.3 million metric tons (MMT) of the following fats on an annual basis ... 

Oleochemicals are derivatives of fats and oils that are used in the chemical industry to produce a wide variety of products that are then used in numerous applications. The chemical reactions that are used require clean, relatively high-quality raw materials in most, but not all, cases. Some of these markets purchase raw materials on price alone, so they usually get the lowest quality oils. The successful operation can take the cheapest waste oils and convert them into high-value end-products. A good example of this is the conversion of spent restaurant grease into bio-diesel fuel. 

Bio-diesel differs from the term bio-fuel in that bio-diesel is conventionally defined as a bio-fiiel that is produced through frani -esterification of the oil or fat with methyl alcohol resulting in the formation of methyl esters (bio-diesel feedstock) and the byproduct glycerine. Bio-diesel can be made from animal fats, recycled cooking oils, restaurant greases, vegetable oils, marine oils, and others. The product has been produced in Europe for many years, and European development is more advanced than in the United States. Table 10 shows the relative production of bio-diesel in five European countries compared with the United States for three different years, 1997, 2000, and 2003 (29). 

Hsu, A.-E K. Jones T.A. Foglia W.N. Marmer. Immobilized lipase-catalyzed production of alkyl esters of restaurant grease as biodiesel. Biotechnol. Appl. Biochem. 2002, 36, 181-186. 

Waste cooking oil and restaurant greases are waste products available in large amounts. 

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