Patent ID: 8153782
Filing Date: 2012-04-10
Classification: C07D,C08B,Y02P

Abstract:
1. A process comprising: (a) dissolving cellulose in a carboxylated ionic liquid to thereby form a cellulose solution; (b) contacting said cellulose solution with an acylating reagent to thereby produce an acylated cellulose solution; (c) contacting said acylated cellulose solution with a precipitating agent, wherein said precipitating agent is a non-solvent for a cellulose ester; (d) separating at least a portion of said carboxylated ionic liquid from at least a portion of said precipitating agent to thereby provide a separated carboxylated ionic liquid; and (e) contacting at least a portion of said separated carboxylated ionic liquid with an alkyl formate under conditions sufficient to convert at least a portion of said separated carboxylated ionic liquid into an ionic liquid wherein the anion is a formate.