Sökning: "Ionic paper"
Visar resultat 6 - 10 av 96 avhandlingar innehållade orden Ionic paper.
6. On the Course of Kraft Cooking - The impact of ionic strength
Sammanfattning : Kraft pulping is the dominant process currently used to produce chemical pulps, and has been applied for more than 130 years. A large number of studies have been conducted to gain a better understanding of the delignification kinetics as well as the reactions of the wood components being dissolved during the cooking process. LÄS MER
7. Filtration of Cellulosic material - the impact of ionic strength and electric field
Sammanfattning : It is crucial that dewatering technology is considered if an economically feasible production of cellulosic materials is to be achieved. Cellulosic materials are often produced in dilute streams and therefore require great amounts of water to be removed to allow for reasonable transportation costs and/or further modifications. LÄS MER
8. Mass Transport in Wood Disintegration: Implications for the Pulp and Paper Industry
Sammanfattning : Efficient delignification and fractionation processes are essential in the pulp and paper industry. Mass transport events in wood fractionation are of great importance, specifically in two main stages, namely, the mass transport of chemicals into wood and the mass transport of degraded lignin molecules out of cellulose confinements. LÄS MER
9. Some factors affecting the amount of residual phase lignin during kraft pulping
Sammanfattning : The amount of lignin which needs to be removed according to the slow residual delignification phase in kraft pulping, i e residual phase lignin, has been studied as a function of the process conditions. The variebles studied were the concentrations of hydroxide ions, hydrogensulfide ions, sodium ions (ionic strength) and temperature. LÄS MER
10. On the Interrelation Between Kraft Cooking Conditions and Pulp Composition
Sammanfattning : In the early 1990’s, a lot of work was focused on extending the kraft cook to a low lignin content (low kappa number). The driving force was the need to further reduce the environmental impact of the bleaching, as less delignification work would be needed there. LÄS MER