Oxidation of cellulose in pressurized carbon dioxide

Esterification of organosolv lignin under supercritical conditions

“…As a result, it promotes the induced polymer and biopolymer transformations these were effected to be easier and complete (Yalpani, 1993); the organic solvents and taxie by-products are eliminated and/or significantly reduced; and finally, the separation and purification of the final product is gen erally faster and easier (Young et al, 2003). These advantages of the use of supercritical carbon dioxide as a solvent for biopolymer chemical modifications have already been demonstrated in the case of cellulose oxidation (Camy et al, 2009).…”

Cellulosic materials as biopolymers and supercritical CO2as a green process: chemistry and applications

“…Treatment of starch, maltodextrines, cellulose acetate and paper with mixtures of scCO 2 and oxygen (19:1 v/v) have led to corresponding oxidised materials (Yalpani 1993). Camy et al (2009) used scCO 2 at 408C and pressures of up to 200 bar as a solvent to dissolve nitrogen oxide (NO 2 ), an efficient oxidant to oxidise primary hydroxyl groups of cellulose, producing oxidised cellulose. Oxidised cellulose is a bioresorbable and haemostatic material that can be used as a biomedical implant.…”

A comparison between neural network method and semi empirical equations to predict the solubility of different compounds in supercritical carbon dioxide

“…This compound has also been used for foam production and production of carbonated glass fiber reinforced cements [2]. Supercritical carbon dioxide has also found in other applications such as production of polymers [3][4][5], synthesis of fibers [6], extraction of pharmaceuticals [7,8], purification of hydrocarbons [9,10], bio oil production [11,12] and oxidation of cellulose [13]. It has been also used in several food processing industries like decaffeination of coffee and tea [14].…”