C - Chemistry – Metallurgy – 08 – B
Patent
C - Chemistry, Metallurgy
08
B
195/139, 260/214
C08B 1/00 (2006.01) C08B 15/02 (2006.01) C13K 1/02 (2006.01)
Patent
CA 1198703
A METHOD OF PRODUCING LEVEL OFF DP MICROCRYSTALLINE CELLULOSE AND GLUCOSE FROM LIGNOCELLULOSIC MATERIAL. ABSTRACT Microcrystalline cellulose has many applications in the pharmaceutical, food, paper and structural composite industries. Level off DP (Degree of Polymerization) microcrystalline cellulose is made up of a chain of about 250 glucose molecules in the form of a microcrystal. In nature, several microcrystals are hinged together and surrounded by amorphous cellulose to form a cellulose microfibril. If the amorphous cellulose is removed, the resultant product is called level off DP (degree of polymerization) microcrystalline cellulose. When lignocellulosic material is processed according to applicant's earlier processes (Canadian Patents 1,096,374 and 1,141,376), the dissociated material is partitioned by removing the lignin and the xylan leaving a low DP ( 320) cellulose fraction. This material can be converted to level off DP microcrystalline cellulose and glucose by soaking the cellulose in an acid solution, dewatering it, returning the acid impregnated cellulose to the reactor, introducing high pressure steam (300-700 psi) and when substantially all of the material reaches a temperature of the order of 215 degrees celcius, releasing it instantly to atmosphere. This procedure will produce a mixture of level off DP microcrystalline cellulose and glucose. If the temperature of the material is allowed to reach a uniform temperature of 234 degrees celcius plus a small allowance for measurement error, before instant release to atmosphere, the procedure will produce substantially all glucose.
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