Abstract
The paper deals with the displacement washing of unbleached pulp cooked from rapeseed straw by soda pulping under laboratory conditions. Pulp fibres were characterised by their average length, as well as by effective specific volume and surface. Using the step function input change method, the washing breakthrough curves measured for alkali lignin as a tracer were described by the dispersed plug flow model containing a dimensionless criterion, the Péclet number. Besides the wash yield, the dispersion coefficient as well as the mean residence time and space time were evaluated. Preliminary results obtained for soda rapeseed pulp were compared with those for kraft hardwood (beech) and softwood (spruce, pine) pulps published earlier. The wash yield measured for soda pulp was found to be lower than that for hardwood and softwood pulps which manifested lower hydraulic resistance. The presence of silique valves in rapeseed straw resulted in lower mean residence time of lignin removed from the pulp bed in comparison with pulp manufactured from stalks only.
References
Barbash, V., Trembus, I., & Shevchenko, V. (2014). Ammoniasulfite-ethanol pulp from wheat straw. Cellulose Chemistry and Technology, 48, 345-353.Search in Google Scholar
Brenner, H. (1962). The diffusion model of longitudinal mixing in beds of finite length. Numerical values. Chemical Engineering Science, 17, 229-243. DOI: 10.1016/0009-2509(62)85002-7. de Carvalho, D. M., Perez, A., Garcia, J. C., Colodette, J. L., Lopez, F., & Diaz, M. J. (2014). Ethanol-soda pulping of sugarcane bagasse and straw. Cellulose Chemistry and Technology, 48, 355-364.Search in Google Scholar
Deniz, İ., Kırcı, H., & Ates, S. (2004). Optimisation of wheat straw Triticum drum kraft pulping. Industrial Crops and Products, 19, 237-243. DOI: 10.1016/j.indcrop.2003.10.011.10.1016/j.indcrop.2003.10.011Search in Google Scholar
Enayati, A. A., Hamzeh, Y., Mirshokraiei, S. A., & Molaii, M. (2009). Papermaking potential of canola stalks. BioResources, 4, 245-256.Search in Google Scholar
Garg, M., Gautam, A. K., & Singh, S. P. (2008). Wheat straw pulp as reinforcing aid for recycled softwood pulp. IPPTA Journal, 20, 113-117.Search in Google Scholar
Gurung, B., & Potůček, F. (2013). Utilization of non-woody plants for pulp production. Papír a Celulóza, 68(5), 147-151.Search in Google Scholar
Huang, G. L., Zhang, C. F., & Chen, Z. S. (2006). Pulping of wheat straw with caustic potash-ammonia aqueous solutions and its kinetics. Chinese Journal of Chemical Engineering, 14, 729-733. DOI: 10.1016/s1004-9541(07)60003-2.10.1016/S1004-9541(07)60003-2Search in Google Scholar
Huang, G. L., Shi, J. X., & Langrish, T. A. G. (2007). A new pulping process for wheat straw to reduce problems with the discharge of black liquor. Bioresource Technology, 98, 2829-2835. DOI: 10.1016/j.biortech.2006.09.029.10.1016/j.biortech.2006.09.029Search in Google Scholar PubMed
Ingmanson, W. L. (1953). Filtration resistance of compressible materials. Chemical Engineering Progress, 49, 577-584.Search in Google Scholar
Miklik, J. (2014). Displacement washing of hardwood pulp. Ph.D. Thesis, University of Pardubice, Pardubice, Czech Republic. (in Slovak) Mohta, D., Upadhyaya, J. S., Kapoor, S. K., Ray, A. K., & Roy D. N. (1998). Oxygen delignification of soda and soda-AQ bagasse pulps. TAPPI Journal, 81(6), 184-187.Search in Google Scholar
Mohta, D., Upadhyaya, J. S., Kapoor, S. K., Ray, A. K., & Roy, D. N. (2001). Reducing the environmental load of bagasse pulping and bleaching process. Cellulose Chemistry and Technology, 35, 319-332.Search in Google Scholar
Mousavi, S. M. M., Hosseini, S. Z., Resalati, H., Mahdavi, S., & Garmaroody, E. R. (2013). Papermaking potential of rapeseed straw, a new agricultural-based fiber source. Journal of Cleaner Production, 52, 420-424. DOI: 10.1016/j.jclepro.2013.02.016.10.1016/j.jclepro.2013.02.016Search in Google Scholar
Potůček, F. (1997). Washing of pulp fibre bed. Collection of Czechoslovak Chemical Communications, 62, 626-644. DOI: 10.1135/cccc19970626.10.1135/cccc19970626Search in Google Scholar
Potůček, F., & Pulcer, M. (2004). Displacement of black liquor from pulp bed. Chemical Papers, 58, 377-381.Search in Google Scholar
Potůček, F., & Miklik, J. (2010). Displacement washing of kraft pulp cooked from a blend of hardwoods. Chemical Papers, 64, 147-153. DOI: 10.2478/s11696-009-0078-7.10.2478/s11696-009-0078-7Search in Google Scholar
Potůček, F., & Miklik, J. (2011) Displacement washing of kraft pulp cooked from beech wood. Acta Facultatis Xylologiae Zvolen, 53(1), 45-54.Search in Google Scholar
Potůček, F., & Milichovsky, M. (2011). Rapeseed straw as a possible source of non-wood fibre materials. Cellulose Chemistry and Technology, 45, 23-28.Search in Google Scholar
Potůček, F., Gurung, B., & Hajkova, K. (2014). Soda pulping of rapeseed straw. Cellulose Chemistry and Technology, 48, 683-691.Search in Google Scholar
Rodriguez, A., Moral, A., Serrano, L., Labidi, J., & Jimenez, L. (2008). Rice straw pulp obtained by using various methods. Bioresource Technology, 99, 2881-2886. DOI: 10.1016/j.biortech.2007.06.003.10.1016/j.biortech.2007.06.003Search in Google Scholar PubMed
Sadawarte, N. S., Dharwadkar, A. R., & Veeramani, H. (1982). Soda-anthraquinone pulping of bagasse. Cellulose Chemistry and Technology, 16, 561-564.Search in Google Scholar
TAPPI (2004). TAPPI test methods. Atlanta, GA, USA: TAPPI Press.Search in Google Scholar
Tutus, A., Deniz, İ., & Eroglu, H. (2004). Rice straw pulping with oxide added soda-oxygen-anthraquinone. Pakistan Journal of Biological Sciences, 7, 1350-1354. DOI: 10.3923/pjbs.2004.1350.1354. 10.3923/pjbs.2004.1350.1354Search in Google Scholar
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