A CORRELATION BETWEEN THE KAPPA NUMBER AND THE VENTORIM INDEX IN THE BLEACHING PROCESS
ABSTRACT The determination of the kappa number in the bleaching process is typically conducted with a pulp quantity between 3 and 4 grams, allowing for the calculation of values above four. However, after the oxidative extraction stage with hydrogen peroxide, the pulp presents a kappa number lower t...
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Sociedade de Investigações Florestais
2025-03-01
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| author | Vitor Hideyoshi Hayashida Ribeiro Evelyn Eduarda Gil dos Santos Fabiana Clara Cezar Alves Marianne Vitória Gil dos Santos Higor Rogério Favarim Gustavo Ventorim |
| author_facet | Vitor Hideyoshi Hayashida Ribeiro Evelyn Eduarda Gil dos Santos Fabiana Clara Cezar Alves Marianne Vitória Gil dos Santos Higor Rogério Favarim Gustavo Ventorim |
| author_sort | Vitor Hideyoshi Hayashida Ribeiro |
| collection | DOAJ |
| description | ABSTRACT The determination of the kappa number in the bleaching process is typically conducted with a pulp quantity between 3 and 4 grams, allowing for the calculation of values above four. However, after the oxidative extraction stage with hydrogen peroxide, the pulp presents a kappa number lower than this value. Therefore, the present study proposes a new method for determining the kappa number by creating the Ventorim bleaching index, which avoids the inconveniences associated with traditional kappa number analysis. For this study, industrial oxygen-delignified pulp was used. Four different ECF bleaching sequences were performed: OD(E+P)DD, OAD(E+P)DP, OADEDP, and OAEDP, along with the determination of the kappa number and the Ventorim bleaching index. The Ventorim index was based on the four chlorinefree bleaching sequences (ECF), all of which achieved a final brightness of 90% ISO, with very similar R2 values and linear regressions. Consequently, a single equation was generated using all the data: Y=0.7202x+0.1464. This unified approach simplifies the analysis and broadens the applicability of the Ventorim bleaching index in the pulp and paper industry. |
| format | Article |
| id | doaj-art-3f2e9155b89b468e83a4d368839fc6cd |
| institution | DOAJ |
| issn | 1806-9088 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | Sociedade de Investigações Florestais |
| record_format | Article |
| series | Revista Árvore |
| spelling | doaj-art-3f2e9155b89b468e83a4d368839fc6cd2025-08-20T03:15:47ZengSociedade de Investigações FlorestaisRevista Árvore1806-90882025-03-014910.53661/1806-9088202549263846A CORRELATION BETWEEN THE KAPPA NUMBER AND THE VENTORIM INDEX IN THE BLEACHING PROCESSVitor Hideyoshi Hayashida Ribeirohttps://orcid.org/0009-0006-6553-9447Evelyn Eduarda Gil dos Santoshttps://orcid.org/0009-0006-7413-5495Fabiana Clara Cezar Alveshttps://orcid.org/0009-0007-4910-7684Marianne Vitória Gil dos Santoshttps://orcid.org/0009-0009-7772-0528Higor Rogério Favarimhttps://orcid.org/0000-0002-8936-9319Gustavo Ventorimhttps://orcid.org/0000-0001-9238-4141ABSTRACT The determination of the kappa number in the bleaching process is typically conducted with a pulp quantity between 3 and 4 grams, allowing for the calculation of values above four. However, after the oxidative extraction stage with hydrogen peroxide, the pulp presents a kappa number lower than this value. Therefore, the present study proposes a new method for determining the kappa number by creating the Ventorim bleaching index, which avoids the inconveniences associated with traditional kappa number analysis. For this study, industrial oxygen-delignified pulp was used. Four different ECF bleaching sequences were performed: OD(E+P)DD, OAD(E+P)DP, OADEDP, and OAEDP, along with the determination of the kappa number and the Ventorim bleaching index. The Ventorim index was based on the four chlorinefree bleaching sequences (ECF), all of which achieved a final brightness of 90% ISO, with very similar R2 values and linear regressions. Consequently, a single equation was generated using all the data: Y=0.7202x+0.1464. This unified approach simplifies the analysis and broadens the applicability of the Ventorim bleaching index in the pulp and paper industry.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-67622025000100206&lng=en&tlng=enBleachingKappa numberVentorim bleaching index |
| spellingShingle | Vitor Hideyoshi Hayashida Ribeiro Evelyn Eduarda Gil dos Santos Fabiana Clara Cezar Alves Marianne Vitória Gil dos Santos Higor Rogério Favarim Gustavo Ventorim A CORRELATION BETWEEN THE KAPPA NUMBER AND THE VENTORIM INDEX IN THE BLEACHING PROCESS Revista Árvore Bleaching Kappa number Ventorim bleaching index |
| title | A CORRELATION BETWEEN THE KAPPA NUMBER AND THE VENTORIM INDEX IN THE BLEACHING PROCESS |
| title_full | A CORRELATION BETWEEN THE KAPPA NUMBER AND THE VENTORIM INDEX IN THE BLEACHING PROCESS |
| title_fullStr | A CORRELATION BETWEEN THE KAPPA NUMBER AND THE VENTORIM INDEX IN THE BLEACHING PROCESS |
| title_full_unstemmed | A CORRELATION BETWEEN THE KAPPA NUMBER AND THE VENTORIM INDEX IN THE BLEACHING PROCESS |
| title_short | A CORRELATION BETWEEN THE KAPPA NUMBER AND THE VENTORIM INDEX IN THE BLEACHING PROCESS |
| title_sort | correlation between the kappa number and the ventorim index in the bleaching process |
| topic | Bleaching Kappa number Ventorim bleaching index |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-67622025000100206&lng=en&tlng=en |
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