Grease Definition
How this site uses the names
Used cooking oil is fryer oil a kitchen sets aside in a container. Yellow grease is that oil after it is collected. Brown grease is what comes out of a grease trap. Choice white grease is an animal-fat product. In rendering, white grease is mostly pork fat.
Yellow grease is not trap grease
The U.S. Energy Information Administration glossary defines yellow grease as used cooking oil and, in the same line, says that oil is collected from restaurant grease traps. This site does not use the name that way. Fryer oil from a container is yellow grease. Grease pumped from a trap is brown grease.
Terms on the EIA biofuel form
Form EIA-819 groups biofuel feedstocks. In that glossary, other waste oils, fats, or greases means a feedstock that is not poultry fat, tallow (beef), white grease (including bacon grease), or yellow grease (including used cooking oil). White grease, on that form, is fat from rendering, mostly pork, collected and processed for biofuel.
Biodiesel and renewable diesel
Biodiesel (B100), in the EIA glossary, is a renewable fuel of mono-alkyl esters made from animal fats, vegetable oils, and recycled grease by transesterification. It is typically blended with petroleum diesel. The glossary gives that blend range as 2 percent to 20 percent, or B2 to B20. Renewable diesel is a hydrocarbon fuel made by hydrotreating animal fats, vegetable oils, and recycled grease. The glossary calls it a drop-in replacement that can be used in diesel engines without modification, and says the fuel reported on Form EIA-819 is produced at biorefineries or co-processed at petroleum refineries.
Lubricants, in the same glossary
The EIA glossary also defines lubricants: substances used to reduce friction between bearing surfaces, or used as processing aids, or used as carriers of other materials. Petroleum lubricants may be made from distillates or residues and include the grades of lubricating oil used in greases. That is lubricating grease, not yellow grease from a fryer.
Source: U.S. Energy Information Administration glossary.
