![]() Finally, a “normal quality pulp” of kappa number 28 and a viscosity of 1113 ml g −1 was successful produced using a cooking process with an impregnation step at 140 ☌ for 3 h and a cooking step at 160 ☌ for 4 h. The resulting data was fitted to a first order kinetic model, with an apparent activation energy of 22 kJ mol −1 in glycerol media. Using such a system, alkaline consumption was monitored during impregnation of spruce chips in glycerol media using chemical charges of 1 M NaOH and 0.1 M NaHS, i. e., kraft pulping conditions, and compared to a similar investigation of alkaline consumption in water media using steel autoclaves. ![]() Using high-boiling solvents, experiments can be done under atmospheric conditions, thus making it easier to continually monitor laboratory experiments and extracting aliquots at desired intervals. ![]() Although organosolv processes using high-boiling solvents have been investigated in recent decades for developing novel industrial processes, there are potential benefits of using high-boiling point solvents for traditional sulphate-based cooking processes, both from an industrial perspective and from a laboratory perspective.
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