Low Temperature Soda-Oxygen Pulping of Bagasse

Abstract

Wood shortages, environmental pollution and high energy consumption remain major obstacles hindering the development of today's pulp and paper industry. Energy-saving and environmental friendly pulping processes are still needed, especially for non-woody materials. In this study, soda-oxygen pulping of bagasse was investigated and a successful soda-oxygen pulping process for bagasse at 100˝C was established. The pulping parameters of choice were under active alkali charge of 23%, maximum cooking temperature 100˝C, time hold at maximum temperature 180 min, initial pressure of oxygen 0.6 MPa, MgSO 4 charge 0.5%, and de-pithed bagasse consistency 12%. Properties of the resultant pulp were screened yield 60.9%, Kappa number 14, viscosity 766 dm 3 /kg, and brightness 63.7% ISO. Similar pulps were also obtained at 110˝C or 105˝C with a cooking time of 90 min. Compared with pulps obtained at higher temperatures (115-125˝C), this pulp had higher screened yield, brightness, and acceptable viscosity, while the delignification degree was moderate. These results indicated that soda-oxygen pulping at 100˝C, the lowest cooking temperature reported so far for soda-oxygen pulping, is a suitable process for making chemical pulp from bagasse. Pulping at lower temperature and using oxygen make it an environmental friendly and energy-saving pulping process.

Analisis Termodinamika Molekul Magnesium Sulphate (MgSO4)

“…Viskositas (43)(44)(45) Kosmetik (25)(26)(27) Ikatan ion (11; 46-48) Bau (4; 5) Titik Leleh (14; 56; 57) Tekanan Uap (58)(59)(60) Masa Molar (49)(50)(51)(52) Densitas (28)(29)(30)…”

Synchronous silicon removal and viscosity reduction in the soda-oxygen pulping of wheat straw

“…Researchers have been developed many methods to address the inherent deficiency of wheat straw for pulping. Wet and dry stock preparation could decrease the silica and ash contents of wheat straw, and vertical digesters for straw pulping could reduce the cost of heat while increasing production efficiency (Yue et al 2016). Recycling of BL during the cooking process could increase the solid contents in the BL.…”

Enhanced delignification selectivity of alkali-oxygen pulping by wet-storage pretreatment with bleaching wastewater

“…Bagasse pulping has been carried out mostly using the soda, sulfate, and neutral sulfite methods. However, industrial processes for bagasse pulp production face several problems such as high cooking temperature, low pulp yields, and environmental pollution (Rainey et al 2004;Yue et al 2016).…”

“…It helps delignification of fibrous raw materials and reduces the chloronome groups in the resulting pulp. Based on the mechanism of alkali-oxygen pulping, permeation enhancement of cooking liquor in bagasse is one of the keys to improve the delignification selectivity in alkali-oxygen pulping (Zhang and Chen 2007;Yue et al 2016). Efficient alkali impregnation by pretreatments is beneficial for uniform pulping and shortening cooking time (Gullichsen and Sundqvist 1995;Malkov et al 2001).…”