36
Calcium
carbonate
removal
1h acidic treatment
With HCL 7%
Filtered and dried in oven
80 C°
Colourremoval
Acetone
24h
Filtered and dried in oven
80 C°
Chitosan
production
1:30h alkaline treatment
With NaOH 55%
Heat: 120C° at reflux
Filtered and dried in oven
80 C°