US 11,655,431 B2
Method for upgrading low-value and waste fats, oils, and greases
David A. Slade, Ames, IA (US); Ramin Abhari, Bixby, OK (US); Martin Haverly, Ames, IA (US); and Peter Z. Havlik, Tulsa, OK (US)
Assigned to REG Synthetic Fuels, LLC, Ames, IA (US)
Filed on Aug. 18, 2021, as Appl. No. 17/405,819.
Application 17/405,819 is a continuation of application No. 16/399,728, filed on Apr. 30, 2019, granted, now 11,118,133.
Claims priority of provisional application 62/665,991, filed on May 2, 2018.
Prior Publication US 2021/0371771 A1, Dec. 2, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. C11B 3/06 (2006.01); C11B 3/10 (2006.01); C11B 13/00 (2006.01); C11B 3/04 (2006.01); C11B 3/00 (2006.01)
CPC C11B 3/06 (2013.01) [C11B 3/001 (2013.01); C11B 3/008 (2013.01); C11B 3/04 (2013.01); C11B 3/10 (2013.01); C11B 13/00 (2013.01); C10G 2300/1011 (2013.01); C10G 2300/1014 (2013.01); C10G 2300/1018 (2013.01)] 20 Claims
OG exemplary drawing
1. A method comprising:
contacting a composition with a caustic solution to produce a first mixture;
separating from the first mixture a caustic-treated composition and producing an aqueous waste with a pH from about 2.0 to about 5.0, wherein the separating comprises the use of a disc-stack centrifuge;
combining the caustic-treated composition with silica particles to produce a slurry; and
removing the silica particles from the slurry to produce a treated composition;
the composition comprises:
one or more of animal fats, animal oils, plant fats, plant oils, vegetable fats, vegetable oils, greases, and used cooking oil,
about 10 wppm or more of total metals;
about 8 wppm or more of phosphorus;
about 10 wppm or more of sulfur;
about 20 wppm or more of nitrogen;
about 5 wt. % or more of free fatty acids; and
has an acid number from about 10 mg KOH/g to about 150 mg KOH/g;
the treated composition comprises:
a wt. % of free fatty acids about that of the composition; and
less total metals, phosphorus, sulfur, and nitrogen than the composition; and
the silica particles have an average particle size from about 10 microns to about 50 microns and a BET surface area from about 200 m2/g to about 1000 m2/g.