Organic compounds -- part of the class 532-570 series – Organic compounds – Oxygen containing
Reexamination Certificate
2006-10-24
2006-10-24
Price, Elvis O. (Department: 1621)
Organic compounds -- part of the class 532-570 series
Organic compounds
Oxygen containing
C568S868000
Reexamination Certificate
active
07126032
ABSTRACT:
A process for purifying glycerin recovered as a byproduct of biodiesel production comprises heating a glycerin effluent stream containing a low molecular weight alcohol, water and fatty acid esters of the low molecular weight alcohol to cause transesterification of the fatty acid esters to glycerides and additional low molecular weight alcohol. The reaction mixture is sparged with nitrogen to help remove water and low molecular weight alcohol, which drives the transesterification reaction towards glyceride formation. A wash water stream may also be added to the recovered glycerin stream from biodiesel production. Either before or following the transesterification reaction, an oil layer can be separated from the recovered glycerin stream by reducing the pH of the stream to below 7. Following separation of the oil layer and transesterification the glycerin stream is flash distilled to separate glycerin from water, salts, and glycerides.
REFERENCES:
patent: 2234400 (1941-03-01), Evans et al.
patent: 2615924 (1952-10-01), Reents
patent: 2741638 (1956-04-01), Blair et al.
patent: 2772207 (1956-11-01), Frankel et al.
patent: 5424467 (1995-06-01), Bam et al.
patent: 6262285 (2001-07-01), McDonald
patent: 2004/0074760 (2004-04-01), Portnoff et al.
Glycerine and Intermediates, by Robert G. Muller, Dec. 1969; pp. 275, 277, 279, 289, 381, 382, 383, 384, 385, 386, 387, 388.
Figure 3.4. Detailed Stand-Alone Biodiesel Process Flow Diagram; 1991.
Ullmann's Encyclopedia of Industrial Chemistry, by Barbara Elvers, Stephen Hawkins, Michael Ravenscroft, James F. Rounsaville and Gail Schulz; pp. 480, 481, 482, 483, 488, 489, 1993.
Drinker Biddle & Reath LLP
Koons, Jr. Robert A.
McWilliams Matthew P.
Price Elvis O.
Sunoco Inc. (R&M)
LandOfFree
Purification of glycerin does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Purification of glycerin, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Purification of glycerin will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3676480