Sugar cane bagasse is treated wih NaOH to remove lignin and free cellulose. The carboxymethylation reaction produces alkali cellulose:-Carboxymethylcellulose. It is ether in which the hydroxyle group of anhydrous glucose is replaced by the carboxymethyl group of monochloroacetate. It is produced by two consecutive reaction: basification and etherification.
Basification:
[C6H7O2(OH)]n + nNaOH==>[C6H7O2(OH)2ONa]n + nH2O
Etherification
[C6H7O2(OH)2ONa]n + nClCH2COONa==> [C6H7O2(OH)2OCH2COONa]n + nNaCl
Schematic flow sheet of cellulose extraction from bagasse
Basification:
[C6H7O2(OH)]n + nNaOH==>[C6H7O2(OH)2ONa]n + nH2O
Etherification
[C6H7O2(OH)2ONa]n + nClCH2COONa==> [C6H7O2(OH)2OCH2COONa]n + nNaCl
Schematic flow sheet of cellulose extraction from bagasse
