Authors*: Diego Pierre de Almeida1
José Lívio Gomide2
The kraft pulping process purpose is to individualize cellulosic
fibers and remove lignin by white liquor, which main components
are sodium hydroxide and sodium sulfide. This process is known to
produce high strength papers, but causes odorous pollution and
increases costs of the black liquor recovery system. The soda process
is an alternative of pulp production without sulfur compounds. This
study carried out a comparison between Soda-control pulp, Sodapulp
with additives (AQ, Surfac. and AQ+Surfac.) and Kraft-control
pulp. Anthraquinone made available a higher pulping yield for
the Soda-process than that of the Kraft-control pulping, but also
increased rejects content for the same kappa number. The surfactant
did not produce good yield results as AQ did, but it kept shives
content at low level. AQ decreases the alkali charge and residual in
soda pulping, especially for AQS mixtures. No additive tested has got
better viscosity results than those of Kraft-control pulp.
* Authors’ references:
1. Laboratório de Celulose e Papel – Universidade Federal de Viçosa, Brasil – Campus Universitário, 36570-000. Viçosa. MG – E-mail: [email protected]
2. Laboratório de Celulose e Papel – Universidade Federal de Viçosa, Brasil – Campus Universitário, 36570-000. Viçosa. MG – E-mail: [email protected]
Corresponding author: Diego Pierre de Almeida. E-mail: [email protected]
José Lívio Gomide2
The kraft pulping process purpose is to individualize cellulosic
fibers and remove lignin by white liquor, which main components
are sodium hydroxide and sodium sulfide. This process is known to
produce high strength papers, but causes odorous pollution and
increases costs of the black liquor recovery system. The soda process
is an alternative of pulp production without sulfur compounds. This
study carried out a comparison between Soda-control pulp, Sodapulp
with additives (AQ, Surfac. and AQ+Surfac.) and Kraft-control
pulp. Anthraquinone made available a higher pulping yield for
the Soda-process than that of the Kraft-control pulping, but also
increased rejects content for the same kappa number. The surfactant
did not produce good yield results as AQ did, but it kept shives
content at low level. AQ decreases the alkali charge and residual in
soda pulping, especially for AQS mixtures. No additive tested has got
better viscosity results than those of Kraft-control pulp.
* Authors’ references:
1. Laboratório de Celulose e Papel – Universidade Federal de Viçosa, Brasil – Campus Universitário, 36570-000. Viçosa. MG – E-mail: [email protected]
2. Laboratório de Celulose e Papel – Universidade Federal de Viçosa, Brasil – Campus Universitário, 36570-000. Viçosa. MG – E-mail: [email protected]
Corresponding author: Diego Pierre de Almeida. E-mail: [email protected]
