INVESTIGADORES
AREA Maria cristina
artículos
Título:
Ultrafiltration of NSSC Spent Liquors, and its Utilization as Papermaking Additives
Autor/es:
AREA, M.C., FELISSIA, F.E., MARTOS, M.S., BENGOECHEA D.I., VENICA A.D., VALADE, J.L
Revista:
TAPPI JOURNAL
Editorial:
Technical Association of the Pulp and Paper Industry
Referencias:
Año: 2001 vol. 84 p. 1 - 15
ISSN:
0734-1415
Resumen:
The present study examines the fractionation of NSSC spent liquors using membranes of dissimilar chemical composition and with different pore sizes, and the utilization of spent liquors components as board additives. The experiments evaluated the use of this method for separating neutral sulfite spent liquors hemicelluloses from lignosulfonates, with the aim of recovering theses by-products. Four ultrafiltration membranes were used. Hemicelluloses and lignosulfonates quantities, ash content, molecular weights distributions of retentates and permeates, BOD5 and COD of the different fractions were determined. The results showed that the membrane with a pore size of 3000 Daltons gave the best results, with the lowest rejection of lignosulfonates. Furthermore, hemicelluloses and NSSC spent liquors were studied as papermaking additives, dosing different quantities of hemicelluloses and spent liquors combined with cationic starch. The influence of pH and aluminum sulfate addition on retention was also studied. Alum did not have any significant influence on soluble substances retention. The best points were selected and incorporation of 1% of starch, and 1.5% of hemicelluloses, spent liquors and an ultrafiltration retentate of spent liquors were applied to pulp furnish. Britt jar tests for fines retention measurements, turbidity, and drainage of the filtrate were also executed. Physical tests on handsheets were made at standard conditions and at high humidity conditions.