Effect of pre-extraction on soda-anthraquinone (AQ) pulping of rice straw

作者：Jahan M Sarwar^*; Shamsuzzaman M; Rahman M Mostafizur; Moeiz S M Iqbal; Ni Y

来源：Industrial Crops and Products, 2012, 37(1): 164-169.

DOI：10.1016/j.indcrop.2011.11.035

• Rice straw
• Pre-extraction
• Pulping
• Drainage resistance
• Strength properties
• Bleaching

The effect of hot-water and alkaline pre-extraction of rice straw on soda-anthraquinone pulping was carried out. The pre-extraction with hot water at 150 C for 1 h dissolved 34.7% biomass and the pre-extracted liquor comprised of 16.6% sugars, 6.7% lignin, 6.6% acetic acid and other unknown products. But the pre-extraction with 1% NaOH at 100 degrees C for 1 h dissolved 10.2% sugars. 5.1% lignin and 10% acetic acid from rice straw. Pre-extracted rice straw was cooked by soda-anthraquinone process with varying alkali charges. The pulp from pre-extracted rice straw was low in kappa number with reduced pulp yield. The drainage resistance (degrees SR) improved obviously on pre-extraction of rice straw. Pulp strength properties such as the tensile index and the burst index were found to be lower, but the tear index was higher both with hot-water and alkaline pre-extraction. After bleaching, the gaps of the overall pulp yield and strength properties between pre-extracted and non-extracted rice straw became narrower. The alkaline pre-extraction showed improved yield and properties compared with hot-water pre-extracted rice straw.

• 出版日期2012-5