Autor(es): Marcondes, Camila Juliane [UNESP] ; Ventorim, Gustavo [UNESP] ; Santos, Rafael dos ; Pereira, Felipo Augusto [UNESP]
Data: 2019
Identificador Persistente: http://hdl.handle.net/11449/185091
Origem: Oasisbr
Assunto(s): chlorine dioxide; pressurized peroxide; kappa number; chlorine dioxide; chlorine dioxide; pressurized peroxide; pressurized peroxide; kappa number; kappa number
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The bleached pulp market has been working to provide brightness levels at values of 92% ISO respecting, however, environmental standards and seeking for less aggressive processes. Then, the additional chlorine dioxide that would be necessary to lift brightness has been replaced by hydrogen peroxide. The present study aimed to evaluate the influence of hydrogen peroxide charge, pressure and temperature variation in the bleaching sequence D-0(E+P)D-1(P+O). It was used industrial kraft pulp, from hybrid of Eucalyptus urophylla X Eucalyptus grandis, oxygen-delignified, whose initial characteristics were: brightness 61.8% ISO, viscosity 36.9 cP and kappa number 8.9. The last stage (P+O) was performed varying the hydrogen peroxide charge (3 kg/t and 6 kg/t), temperature (95 degrees C and 105 degrees C) and pressure (0 atm and 5 atm). To evaluate the effect of such variations over cellulosic pulp, viscosity, brightness and brightness reversion tests were carried out according to TAPPI standards. In general, increase of hydrogen peroxide charge (from 3 kg/t to 6 kg/t) caused a small increasing on brightness values and a small viscosity decreasing on the cellulosic pulp. The increase of 10 degrees C in temperature had a positive effect on brightness parameter, increasing the respective values, on the other hand, for the viscosity analysis the achieved values showed a reduction tendency. For the variation of oxygen pressure it was also observed brightness increasing and viscosity decreasing.
Univ Estadual Paulista, Fac Engn Guaratingueta, Av Ariberto Pereira da Cunha 333, BR-12516410 Guaratingueta, SP, Brazil
Univ Estadual Paulista, Campus Itapeva,Rua Geraldo Alckminm 519, BR-18409010 Itapeva, SP, Brazil
Inst Fed Sao Paulo, Dept Mecan, Av Joao Olimpio de Oliveira 1561, BR-18202000 Itapetininga, SP, Brazil
Univ Estadual Paulista, Wood Pack Ind & Comercio Ltda, Campus Itapeva,Rua Tino Vitto 270, BR-18760000 Sao Paulo, SP, Brazil
Univ Estadual Paulista, Fac Engn Guaratingueta, Av Ariberto Pereira da Cunha 333, BR-12516410 Guaratingueta, SP, Brazil
Univ Estadual Paulista, Campus Itapeva,Rua Geraldo Alckminm 519, BR-18409010 Itapeva, SP, Brazil
Univ Estadual Paulista, Wood Pack Ind & Comercio Ltda, Campus Itapeva,Rua Tino Vitto 270, BR-18760000 Sao Paulo, SP, Brazil
