Rice straw pulp obtained by using various methods
2008
Rodríguez, Alejandro | Moral, Ana | Serrano, Luis | Labidi, Jalel | Jiménez, Luis
Rice straw was used as an alternative raw material to obtain cellulosics pulps. Pulping was done by using classics reagents as soda (with anthraquinone and parabenzoquinone as aditives), potassium hydroxide and Kraft process. The holocellulose, α-cellulose and lignin contents of rice straw (viz. 60.7, 41.2 and 21.9wt%, respectively) are similar to those of some woody raw materials such as pine and eucalyptus, and various non-wood materials including olive tree prunings, wheat straw and sunflower stalks. Pulping tests were conducted by using soda, soda and anthraquinone at 1wt%, soda and parabenzoquinone at 1wt%, potassium hydroxide and sodium sulphate (Kraft process) under two different sets of operating conditions, namely: (a) a 10wt% reagent concentration, 170°C and 60min; and (b) 15wt% reagent, 180°C and 90min. The solid/liquid ratio was 6 in both cases. Paper sheets made from pulp extracted by cooking with soda (15wt%) and AQ (1wt%) at 180°C and 90min pulp exhibit the best drainage index, breaking length, stretch and burst index (viz. 23°SR, 3494m, 3.34% and 2.51kN/g, respectively).
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