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US 11,441,264 B1Granted
Method of obtaining rayon fibers
AssigneeKing Abdulaziz University
InventorsSherif Hindi, Uthman Mohammed Dawoud
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Abstract
A method of obtaining rayon fibers from cellulose waste is provided. The method includes extracting alpha-cellulose from cellulose waste, dissolving the alpha-cellulose in a cuoxam solution, obtained by reacting gaseous ammonia with an aqueous solution of copper hydroxide, to obtain a chemically modified cellulose. The chemically modified cellulose was extruded in an acid bath to obtain a precipitate. The precipitate was further neutralized to obtain the rayon fibers.
Claims17
A method of obtaining rayon fibers from a cellulose waste, the method comprising:
- extracting alpha-cellulose from the cellulose waste;
- reacting gaseous ammonia with an aqueous solution of copper hydroxide to obtain a cuoxam solution;
- dissolving the alpha-cellulose in the cuoxam solution to obtain a chemically modified cellulose;
- extruding the chemically modified cellulose into an acid bath to obtain a precipitate;
- and
- neutralizing the precipitate to obtain the rayon fibers,
- wherein the method further comprises extracting alpha-cellulose from the cellulose waste by chemical maceration with hydrogen peroxide and citric acid.
4 more elements
Dependencies are inferred from the claim text.