	US 12,129,314 B1
	Ultrasound-assisted method for high-yield cellulose extraction from raw rice straw without the need for bleaching step
Gausal Azam Khan, Al Ahsa (SA); Sankha Chakraborty, Odisha (IN); Suraj K. Tripathy, Odisha (IN); and Shirsendu Banerjee, Odisha (IN)
Assigned to KING FAISAL UNIVERSITY, Al-Ahsa (SA)
Filed by KING FAISAL UNIVERSITY, Al-Ahsa (SA)
Filed on Jan. 31, 2024, as Appl. No. 18/429,102.
Int. Cl. C08B 15/00 (2006.01)

CPC C08B 15/00 (2013.01)

14 Claims

1. A method of making microcrystalline grade powdered cellulose from rice straw, the method comprising:

obtaining rice straws;

drying the rice straws to obtain dried rice straws;

cutting the dried rice straws to obtain rice straw pieces;

soaking the rice straw pieces in a solvent to obtain a mixture;

adding the mixture to an acidic solution to obtain a solution mixture;

ultrasonicating the solution mixture to obtain extracted cellulose;

separating the extracted cellulose from the solution mixture via filtering to obtain filtered extracted cellulose;

adding the filtered extracted cellulose to a solution of sodium hydroxide to obtain a mercerized mixture;

stirring while heating the mercerized mixture to obtain mercerized cellulose;

separating the mercerized cellulose from the mercerized mixture via filtering to obtain filtered mercerized cellulose; and

drying the filtered mercerized cellulose to obtain microcrystalline grade powdered cellulose.