Pulp Production from Cotton Stalks using Kraft Pulping
| dc.contributor.advisor | Kiflie, Zebene (PhD) | |
| dc.contributor.author | Asmare, Gedefaw | |
| dc.date.accessioned | 2018-07-13T07:21:48Z | |
| dc.date.accessioned | 2023-11-10T14:54:48Z | |
| dc.date.available | 2018-07-13T07:21:48Z | |
| dc.date.available | 2023-11-10T14:54:48Z | |
| dc.date.issued | 2015-07 | |
| dc.description.abstract | The study aimed at optimizing pulping variables and selecting suitable delignification conditions for the production of pulp from cotton stalk. The influence of operational variables on the pulp yield and lignin dissolution of cotton stalks was studied. Cotton stalks chips were delignified in a laboratory pulpwood according to the Kraft pulping process. The conditions used were: Active alkali charge (5- 25%), sulfidity (10-50%), cooking temperature (155-175oC and cooking time (30 – 150 minutes). The cotton stalks chip size and liquor to solid ratio were kept constant at 2cmX0.5cmX0.5cm on average and 5L to 1kg, respectively. Experimental data were fitted into a central composite design and a quadratic equation has developed. Model prediction for pulp yield and kappa number showed good agreement with experimental data with error values less than 5%. Optimum pulp percent yield (39.79%) was obtained using at 16.65% of active alkali, 20% of sulfidity, 163oC temperature and 60 minutes of cooking time. The study shows that pulping at low temperatures for a short cooking time with high concentration of pulping liquor gives the best compromise for both pulp yield and kappa number/residual lignin content. The results of morphology analysis and pulp hand sheet physical tests shows that cotton stalks has similar fiber dimension and paper quality with eucalyptus. | en_US |
| dc.description.sponsorship | Addis Ababa University | en_US |
| dc.identifier.uri | http://etd.aau.edu.et/handle/12345678/8482 | |
| dc.language.iso | en | en_US |
| dc.publisher | Addis Ababa University | en_US |
| dc.subject | Process Engineering Stream | en_US |
| dc.title | Pulp Production from Cotton Stalks using Kraft Pulping | en_US |
| dc.type | Thesis | en_US |