Sodium carbonate is one of the inexpensive and environmentally friendly alkali chemicals used for pretreatment under harsh conditions (e.g., 20 bar and 180◦C) and also oxidative pretreatment of lignocellulosic materials (Bjerre et al., 1996; Salehi et al.,2012; Schmidt and Thomsen, 1998; Vaccarino et al., 1987).