INVESTIGADORES
AREA Maria Cristina
congresos y reuniones científicas
Título:
Chelating agents in Eucalyptus kraft pulps: I- Phosphonates in pulping and brown stock washing
Autor/es:
FELISSIA, F.E.; AREA, M.C.
Lugar:
Campinas, Sao Paulo, Brasil
Reunión:
Congreso; Congreso Ibero Americano de Investigación en Celulosa y Papel , (CIADICYP 2002); 2002
Institución organizadora:
RIADICYP-USP
Resumen:
Adding chelants in cooking is a valid alternative to remove harmful ions before the oxygen stage. This option involves the use of new products that undergo high temperatures and pH. This work studied chelating agents application during Eucalyptus spp. kraft pulping and brown stock  washing. Pulps were prepared to be bleached by a TCF procedure afterwards. DTPMPA(diethylene triamine penta(methylene phosphonic acid)) and SPAP (Sodium salt solution ofPolyaminophosphonic acids), were applied in cooking and brown stock washing following a 22 factorial experimental design. Results show that DTPMPA is effective to reduce metallic ionswhen applied in brown stock washing, producing better levels of physical properties referred tothe control (without any treatment). SPAP shows a good performance in physical propertieswhen applied in cooking with a usual washing (without chelant), but metals are best removedwhen dosed in brown stock washing.