We have studied the influence of pH and sodium concentration in liquor on sodium adsorption by Eucalyptus globulus kraft pulp. The adsorption is negligible at pH<3 and increases with increasing pH to reach a limit value of the amount of sodium adsorbed at pH 7-8. Under such conditions, the carboxyl groups present in the lignin and the polysaccharide fractions of the pulp dissociated completely. We adjusted the equilibrium data satisfactorily to the Langmuir model, and obtained the values Q=8.26 kg sodium sulfate (Na 2SO4)/o.d, ton pulp and k=62.8 L/g Na2SO 4 for the isothermal parameters. These parameters, incorporated into the WinGEMS simulator, will allow us to obtain the sodium balance and to simulate the totally chlorine free (TCF) kraft pulp process.
|Number of pages||3|
|Publication status||Published - 2002|