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Resin and fatty acids in kraft pulp washing Physical state, colloid stability and washability

The physical state of fatty and resin acids during washing of kraft pulp has been investigated in model systems. In the beginning of washing when the sodium concentration is high, the soap precipitates as liquid crystalline sodium soaps. At the end of washing the sodium concentration has decreased and the soap precipitates as calcium soap. The colloidal stability of the precipitate decreases with increasing calcium and sodium concentration. The size of the flocsincreases. Addition of kraft lignin decreases the floc size. The colloidal and total retention (including filtration effects) of soap on fibers has also been studied. The colloidal retention of fatty acids is much higher than that of resin acids. The total retention of both fatty and resin acids is high. Finally, the effects of pitch dispersants have been investigated.