Pitch and deposition problems and handling

Pitch and deposition problems and handling Dissolved and colloidal substances are released from wood during mechanical refining and grinding, as well as in chemical kraft cooking. One of the most problematic groups is wood extractives, also called wood pitch. These react easily with pulping and bleaching additives and recycled pulp contaminants in addition to the

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Authors & references

Author:

Mari Zabihian, Kemira Oyj

References:

Zabihian, M., Lewis, C., Villanen, H., Rintala, J., “Management of Hydrophobic Particle Size for Improved Paper Machine Wet-end Stability” TAPPI PaperCon, April 22–25, 2012, New Orleans.
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Back E., Allen, L.H., (eds.): “Pitch control, wood resin and deresination”. TAPPI PRESS, Atlanta 2000.
Ekman, R., Eckerman, C., Holmbom, B., “Studies on the behaviour of extractives in mechanical pulp suspensions”. Nord. Pulp Pap. Res. J. 5:2, 96–102 (1990).
Hannuksela, T., Qin, M., Holmbom, B., ”Physico-chemical characterisation of TMP resin and related model mixtures”, Colloids and Surfaces A: Physicochemical and Engineering Aspects 221, p. 243–254 (2003).
Thornton, J., “Dissolved and colloidal substances in the production of wood-containing paper”. Doctoral dissertation, Åbo Akademi, Turku (1993).
Zabihian, M., “Dissolved and colloidal substances (DCS) and their determination on a LWC –paper machine”. Master´s thesis, Åbo Akademi, Turku, Finland, 84 p (1995).
Sundberg, K., “Effect of wood polysaccharides on colloidal wood resin in papermaking”. Doctoral dissertation, Åbo Akademi, Turku (1995).
Bergelin, E., Holmbom, B., “Deresination of Birch Kraft Pulp in Bleaching”. JPPS, vol. 29 (1), p. 29–34 (2003).
McLean, D.S., Vercoe, D., Stack, K.R., Richardson, D., “The colloidal pKa of lipophilic extractives commonly found in Pinus radiate”, Appita Journal, 58 (5). pp. 362–366 (2005).
Sundberg, A., Strand, A., Vähäsalo, L., Holmbom, B., “Phase distribution of resin and fatty acids in colloidal wood pitch emulsions at different pH-levels”, J. Disp. Sci. Technol., 30(6), 912–919 (2009).
MacNeil, D., Sundberg, A., Vähäsalo, L., Holmbom, B., “Effect of Calcium on the Phase Distribution of Resin and Fatty Acids in Pitch Emulsions”, J. Disp. Sci., Technol, 32, 269–276 (2011).
Vähäsalo L., Holmbom B., “Effect of pH and calcium chloride on pitch in peroxide-bleached mechanical pulp suspensions”. Seventh European Workshop on lignocellulosics and Pulp, Turku/Åbo, Finland, August 26–29, 2002, 423–426.
Lee, R., Stack, KR., Richardson, DE., Lewis, TW., Garnier, G., “Aggregation studies of Pinus radiata wood extractives under increased system closure”. 65th Appita Annual Conference, 10-13 April, Rotorua, New Zealand (2011).
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Zabihian, M., Sundberg, A., Holmbom, B., “Removal of Dissolved and Colloidal Substances from Mechanical Pulp Process Waters by Coagulation-Flocculation. Seventh European Workshop on Lignocellulosics and Pulp, Turku/Åbo, Finland August 26–29, p. 427–430 (2002).
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This page has been updated 15.11.2020

Pitch and deposition problems and handling

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