Organic compounds -- part of the class 532-570 series – Organic compounds – Carbohydrates or derivatives
Patent
1997-02-28
1999-01-12
Nutter, Nathan M.
Organic compounds -- part of the class 532-570 series
Organic compounds
Carbohydrates or derivatives
536124, 536125, 523129, C07G 1700, C08K 500
Patent
active
058592369
ABSTRACT:
The method of the invention involves treating cellulosic vegetable matter (the "Feed Stocks") for the selective recovery of lignin (when present in the feed-stock), cellulose and hemicelluloses by: (1) reducing the material to be processed to an appropriate size; (2) adjusting the moisture content of the ligno-cellulosic feed stock to 15 percent to 30 percent water; (3) impregnating the ligno-cellulosic feed stock with an extraction liquor containing a glycol and an organic or Lewis acid; (4) rapid heating of said impregnated feed stock to a temperature of about 118.degree. C. to about 145.degree. C.; (5) maintaining the desired temperature for about 1 minute to about 6 minutes to solubilize the lignin therefrom (a period of about 2 minutes to about 5 minutes is preferred); (6) stopping the reaction immediately by lowering the temperature to <100.degree. C. in a quenching bath of fresh or recycled liquor or other suitable liquid; (7) removing the lignin-enriched extraction liquor from the quenched impregnated matter and (8) recovering the extracted lignin. If the feed stock is non-ligneous (for example, cotton linters), the quenching step (step 6) may be combined with a wash (alcohol is exemplified) to remove the cooking liquor from the cooked material. The cellulosic material may then be recovered from the liquid using separatory means known in the art such as filtration, centrifugation or vacuum screening. Alcohol may be recovered by evaporation under reduced pressure. An improved means of converting the cellulose fraction to microcrystalline cellulose employs using ultrasonic means.
REFERENCES:
patent: 3442753 (1969-05-01), Burkart
patent: 3522230 (1970-07-01), Burkart
patent: 4746401 (1988-05-01), Roberts et al.
patent: 4826566 (1989-05-01), Burkart
patent: 5123962 (1992-06-01), Komuro et al.
Hendricks Glenna
Nutter Nathan M.
LandOfFree
Process for preparation of lignin and microcellulose does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for preparation of lignin and microcellulose, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for preparation of lignin and microcellulose will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1517857