Organic compounds -- part of the class 532-570 series – Organic compounds – Carbohydrates or derivatives
Reexamination Certificate
2004-05-24
2009-06-09
McIntosh, III, Traviss C (Department: 1623)
Organic compounds -- part of the class 532-570 series
Organic compounds
Carbohydrates or derivatives
C536S055300, C536S124000
Reexamination Certificate
active
07544785
ABSTRACT:
Disclosed is a process for the deacetylation of chitin and a process for the treatment of chitinaceous materials to obtain chitin which processes are conducted in a non-saponifiable, non-aqueous, water insoluble liquid having a flash point greater than about 100° C., preferably a non-aromatic hydrocarbon. The process for the deacetylation of chitin comprises suspending chitin in the hydrocarbon liquid, preferably from about 0.02 g/cc to about 0.2 g/cc, mixing therewith an alkali metal hydroxide solution, and heating the suspension at a temperature at least about 70° C. for a period of time sufficient to obtain the desired degree of deacetylation. The concentration of alkali metal hydroxide in the alkali metal hydroxide solution is at least 30% by weight, preferably at least 40% by weight, and most preferably at least 50% by weight, and the quantity of alkali metal hydroxide is sufficient to provide an alkali metal hydroxide to chitin weight ratio from about (0.35)(AMHMW)/40 to about (2.5)(AMHMW)/, 40 where AMHMW is the molecular weight of the alkali metal hydroxide.
REFERENCES:
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patent: 6458938 (2002-10-01), Cha et al.
patent: 6972284 (2005-12-01), Fan et al.
patent: 2004/0215005 (2004-10-01), Varum et al.
Benoit Catherine G.
Blanchard Andre′ N.
Cowan Jack C.
Rodrigue Tammy L.
House Roy F.
McIntosh, III Traviss C
Venture Chemicals, Inc.
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