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Patent US9708760
Issued 2017-07-18
Esterified Cellulose Pulp Compositions And Related Methods
Esterified cellulose pulp compositions produced in high yield from commercially available wood pulp sources, methods for making the esterified cellulose pulp compositions, and articles prepared from the esterified cellulose pulp compositions.
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- 1. A method of making an esterified cellulose pulp composition, comprising:
(a) combining an ionic liquid and a cellulose pulp to provide a cellulose solution, wherein the cellulose pulp has an alpha cellulose content from 70 to 90 wt %, a hemicellulose content from about 5 to about 20% by weight, and a degree of polymerization from about 150 to about 1,000; (b) adding an esterification agent, optionally a catalyst to the cellulose solution to provide a reaction mixture; and (c) isolating the esterified cellulose pulp composition from the reaction mixture; wherein the esterified cellulose pulp composition has a degree of substitution from about 0.1 to about 3.0, a sulfur content less than about 45 ppm, and a nitrogen content less than about 0.2% by weight based on the total weight of the composition.
- 14. A method of making an esterified cellulose pulp composition, comprising:
(a) combining an ionic liquid and a cellulose pulp to provide a cellulose solution; (b) adding an esterification agent to the cellulose solution to provide a reaction mixture; and (c) isolating from the reaction mixture an esterified cellulose pulp composition having a degree of substitution from about 0.1 to about 3.0, a hemicellulose content from about 2.5 to about 20 percent by weight based on the total weight of the composition, and an intrinsic viscosity from 0.7 to 3.0 dL/g.
- 15. A method of making an esterified cellulose pulp composition, comprising:
(a) combining an ionic liquid and a cellulose pulp to provide a cellulose solution; (b) adding an esterification agent to the cellulose solution to provide a reaction mixture; and (c) isolating from the reaction mixture a C2 to C12 alkyl esterified cellulose pulp composition having a degree of substitution from about 2.0 to about 2.5, a hemicellulose content from about 3.5 to about 10 percent by weight based on the total weight of the composition, and an intrinsic viscosity from 0.7 to 3.0 dL/g.
