Abstract
Morphological characteristics and proximate chemical analysis of E. binata showed it as a suitable raw material for writing and printing grade paper. Maximum pulp yield (43.58%) of kappa number 17.38 with 0.9% screening rejects was obtained at 12% of active alkali (as Na2O) pulping temperature 130°C, cooking time 120 min and solid to liquor ratio 1:4. During bio-soda pulping of E. binata, pulp yield decreased slightly while pulp brightness, tensile index, burst index and double fold numbers were improved by 4.1%, 24.94%, 14.03% and 48.45% respectively compared to soda pulping. During ethanol-soda pulping of E. binata, pulp yield, pulp brightness, tensile index, burst index and double fold numbers were improved by 3.9%, 6.6%, 32.18%, 35.40% and 77.31% respectively compared to soda pulping.
Highlights
Annual production of paper, paperboard and newsprint in India is 10.11 million tonnes while consumption of paper, paperboard and newsprint in the country is 11.15 million tonnes/annum till 2012
For the proximate chemical analysis, E. binata was milled in a Wiley mill (Weverk, A-47054, Sweden) and the portion passed through ‒40 size mesh and retained on +80 size mesh was used for proximate analysis
In the present study, during ethanol-soda pulping of E. binata higher pulp yield, superior physical strength optical properties and lower kappa number were observed due to the selective removal of lignin, retention of hemicelluloses and less degradation of cellulose
Summary
Paperboard and newsprint in India is 10.11 million tonnes while consumption of paper, paperboard and newsprint in the country is 11.15 million tonnes/annum till 2012. In India, the major raw materials for paper, paperboard and newsprint production were forest. Many fast growing annual and perennials plants have been identified, cultivated and studied for their suitability for pulp and paper industry [6]. Kraft and soda pulping methods have been utilized predominantly for the delignification of raw materials and production of pulp for papermaking. Addition of organic solvent with kraft or soda pulping process may be used to enhance the delignification selectivity during the process Organic solvents such as ethanol, methanol, acetone, acetic acid, formic acid, ethylene glycol and ethanolamine have been utilized in organosolve pulping [12]-[14]. Bio-pulping is another approach which has been proved to be environment friendly and cost effective method for delignification of raw materials. A comparison among soda, ethanol-soda and bio-soda pulping of E. binata was carried out
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