In this study, the production yield of CA from cotton lin-ters (54%) was higher than that prepared by iodine-catalyzes acetylation reaction. This gave a production yield of 34% from cottonseed hull and 37% from cotton burr (Cheng et al., 2010). This might have been due to the difference in methods used for the acetylation process and, also, the types of cellulosic resi-dues. Also, the production yield of CA from flax fibers was
higher than that from cotton linters and this might have been due to flax fiber being 50–120 cm long (Agricultural Egyptian Government, 2011) compared with cotton linter which was 2–6 mm long (Axel, 2009). Also, Fig. 1A and B (material and methods section) proved, also, that there was no signifi-cant difference in the cellulose content of the two residues.