Sugar – starch – and carbohydrates – Processes – Carbohydrate manufacture and refining
Patent
1985-12-04
1987-02-24
Metz, Andrew H.
Sugar, starch, and carbohydrates
Processes
Carbohydrate manufacture and refining
162 14, 162 16, 162 21, 162 22, 426 52, 426658, 435105, 435165, 435277, 536 56, 127 1, C21B 136, C13K 100, C13K 102
Patent
active
046455418
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 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 Pat. Nos. 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.degree. C., releasing it instantly to atmosphere. This procedure will produce a mixture of level off DP microcrystalline cellulose and glucose. If the acid solution employed is sulfuric acid and the temperature of the cellulose is allowed to reach a uniform temperature of 234.degree. C. before instant release to atmosphere, the procedure will produce substantially all glucose.
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patent: 4427453 (1984-11-01), Reitter
patent: 4427584 (1984-01-01), LeGrand et al.
patent: 4461648 (1984-07-01), Foody
Metz Andrew H.
Pak Chung K.
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