Alkaline Sulfite Anthraquinone and Methanol Pulping of Bamboo (Gigantochloa scortechinii)

Abstract

Alkali ratios and cooking time of the alkaline sulfite anthraquinone (AQ) and methanol (ASAM) pulping process of bamboo (Gigantochloa scortechinii) were studied. Bamboo chips were cooked at three different levels of sodium hydroxide and cooking time, namely 14, 16, or 18% for 60, 90, or 120 minutes. Pulping parameters that remained constant were the use of 0.5% ethylene diamine tetraacetic acid (EDTA), with an 80/20 ratio Na 2 SO 3 /NaOH, 0.1% anthraquinone, 15% methanol, and a temperature of 170 °C in the cooking process. Samples prepared using 14% NaOH and 90 min of cooking time resulted in the highest pulp yield, 52.4%, and a Kappa number of 18.1. It seems that 16% sodium hydroxide and 90 min of cooking time are the most appropriate cooking conditions, giving a 49.1% pulp yield and 14.2 Kappa number. The quality of bamboo pulp produced by the ASAM pulping process was found to be beneficial for the use in paper and board manufacturing.

Effects of Alkaline Sulfite Anthraquinone and Methanol Pulping Conditions on the Mechanical and Optical Paper Properties of Bamboo (Gigantochloa scortechinii)

“…The chip moisture content was determined after air-drying the chips. The pulping conditions of unbleached bamboo ASAM pulp are shown in Table 1 (Moradbak et al 2016). …”

“…celluloses from the pulp fibers (Khider et al 2012a;Moradbak et al 2016). Therefore, more fiber-to-fiber bonding was developed during papermaking.…”

“…Methanol causes higher pressure in the pulp digester, which releases air trapped in the bamboo chips and permits the penetration of chemicals, while AQ accelerates lignin dissolution (Shukry et al 1999;Khristova et al 2004;Sixta 2006;Sridach 2010;Moradbak et al 2016). As a result, the kappa number of unbleached bamboo ASAM pulp was relatively low, 19.18 to 10.38 (Moradbak et al 2016). These combinations of chemicals and release of the lignin in the unbleached bamboo pulp may have reduced the chromophore content of the produced pulp.…”

“…The alkaline sulfite anthraquinone with methanol (ASAM) pulping process is an alternative to the kraft and soda pulping processes. The biometrics characteristics, chemical compassion, pulp yield, and kappa number of the unbleached bamboo ASAM pulp have been presented in a previous study (Moradbak et al 2016). This work offers a brief outline of the papermaking process and describes the mechanical and optical paper properties associated with the tested processes.…”

Introductory Chapter: An Overview of Bamboo Research and Scientific Discoveries

“…The changes in engineering properties of the thermoplastic matrices after the incorporation of untreated and treated bamboo are few of the uses of bamboo in polymer composite. The recent report of the suitability of the alkaline sulphite anthraquinone and methanol pulping on bamboo culms, i.e., G. scortechinii bamboo species, has been attracting the attention of polymer scientists [11]. Its use in industrial production of pulp and paper packaging was buttressed by the biometric characterization of the bamboo culms together with the optimum pulping parameters.…”