Process of Soda-AQ Pulping of Fast-Growing Poplar and Defibration Point

Abstract

Fast-growing Poplar cooked by Soda-AQ process was studied, by determining the lignin contents including Klason lignin and acid soluble lignin, the yield of pulping, the rate of carbohydtare degradation and the rate of delignification.Results indicated that the delignificaton of Fast-growing Poplar in Soda-AQ pulping can be divided into three distinguishable stages. (a)The initial delignification stage before 140°C,the rate of delignification reaches to 30.87%;(b)The bulk delignification stage, the rate of delignification reaches to 86.97%，in the period from 140°C to 170°C and for 30 min;(c)The residual delignification stage,the rate of delignification exceeds 91.60%. The defibration point was reached when cooking temperature raised to 170°C and for 30 min with 57.50% pulping yield ,24.94 kappa nomber.

Evolution of Lignocellulosic Macrocomponents in the Wastewater Streams of a Sulfite Pulp Mill: A Preliminary Biorefining Approach

“…Among the chemical processes, kraft is the most commonly used. However, other processes such as soda-anthraquinone (soda-AQ); ethanol-water pulping (organosolv); acid sulfite and bisulfite pulping; sulfite pretreatment to overcome recalcitrance of lignocellulose (SPORL); or SO 2ethanol-water process (SEW) can also be used [3][4][5][6][7][8][9][10]. Sulfite pulping is becoming popular because of the growing demand of high purity dissolving pulp for textile fiber production.…”

Effects of enzyme pretreatment on the beatability of fast-growing poplar APMP pulp

“…Then the fiber can become looser and softer, and the fibrillation extent of the treated fibre is better than that of untreated fibres. Part of the fine fibre can be degraded so that the treated pulp can more easily be beaten or refined, and the same measures can promote fibre drainage and improved pulp physical strength (Guan et al 2000;Yang et al 2009). Enzyme treatment can enhance swelling and absorption capability of fibres, improve the refining properties of pulp, and reduce refining energy (Darcfa et al 2002;Shen et al 2002;Zhang and Li 2005;Zhang and Xu 2009;Chen et al 2010;Jiang et al 2007).…”