The Effect of H-Factor on Kappa Number and Viscosity in Continuous Digester

Rizka Wulandari Putri; Rahmatullah Rahmatullah; Faisal Siagian

doi:10.25273/cheesa.v6i1.15681.26-33

The Effect of H-Factor on Kappa Number and Viscosity in Continuous Digester

Rizka Wulandari Putri, Rahmatullah Rahmatullah, Faisal Siagian

Abstract

One of the most important steps in pulping is the cooking process, which serves to separate the cellulose and hemicellulose from lignin and other by-products. During the cooking process in the digester, various factors must be considered to create high-quality pulp. Among these factors, the H-Factor plays a significant role due to its impact on the kappa number and viscosity in the pulping process. A high H-Factor can also damage the strength of the pulp. Therefore, this research aims to investigate the effect of the H-Factor and active alkali on pulp yield and quality. The active alkali used was in line with the desired production objectives, as insufficient levels of active alkali can lead to a low yield of pulp. Meanwhile, pulp quality standards in the Pulp and Paper Industry included kappa number of 12-18 in the digester process, an approximate viscosity of 23 mPa.s, and the selection of H-Factor based on the desired production target.

Keywords

active alkali; cooking process; H-Factor; kappa number; viscosity

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References

Ardina, V., Irawan, B., Prajitno, D. H., & Roesyadi, A. (2018). Active alkali charge effect on kraft pulping process of acacia mangium and eucalyptus pellita. In AIP Conference Proceedings, 1-6. DOI: 10.1063/1.5054440

Bahri, S. (2017). Pembuatan Pulp dari Batang Pisang. Jurnal Teknologi Kimia Unimal, 4(2), 36. DOI: 10.29103/jtku.v4i2.72

Li, J., Hu, H., & Chai, X. (2017). The kinetic modeling of carbonate formation during kraft pulping of eucalyptus wood. AIChE Journal, 63(5), 1489-1493. DOI: 10.1002/aic.15681

Luo, X., Liu, J., Zhan, H., Cao, S., Huang, L., & Chen, L. (2013). Prediction model and in-digester control of residual alkali content in black liquor during kraft pulping of eucalyptus. Journal of Biobased Materials and Bioenergy,7 (5), 559-565. DOI: 10.1166/jbmb.2013.1391

Małachowska, E., Dubowik, M., Boruszewski, P., Łojewska, J., & Przybysz, P. (2020). Influence of lignin content in cellulose pulp on paper durability. Scientific Reports, 10(1), 1–12. DOI: 10.1038/s41598-020-77101-2

Mercangoz, M., & Doyle, F. J. (2006). Characterizing the process from the digester to the paper machine. IEEE Control Systems, 26(4), 30–39. DOI: 10.1109/MCS.2006.1657874

Núñez, N., Martín-Alfonso, J. E., Eugenio, M. E., Valencia, C., Díaz, M. J., & Franco, J. M. (2012). Influence of eucalyptus globulus kraft pulping severity on the rheological properties of gel-like cellulose pulp dispersions in castor oil. Industrial and Engineering Chemistry Research, 51(29), 9777–9782. DOI: 10.1021/ie301014v

Pascoal, N., C., Evtuguin, D. V., Furtado, F. P., & Mendes, S. A. P. (2002). Effect of pulping conditions on the ECF bleachability of Eucalyptus globulus kraft pulps. Industrial and Engineering Chemistry Research, 41, 6200-6206. DOI: 10.1021/ie020263x

Resalati, H., Kermanin, H., Fadavi, F., & Feizmand, M. (2012). Effect of Hot-Water and Mild Alkaline Extraction on Soda-Aq Pulping of Wheat Straw. Lignocellulose, 1(1), 71-80.

Santos, R. B., Jameel, H., Chang, H. M., & Hart, P. W. (2012). Kinetics of hardwood carbohydrate degradation during kraft pulp cooking. Industrial and Engineering Chemistry Research. 51, 12192-12198. DOI: 10.1021/ie301071n

Segura, T. E. S., dos Santos, J. R. S., Sarto, C., & da Silva, J. F. G. (2016). Effect of Kappa Number Variation on Modified Pulping of Eucalyptus. BioResources, 11(4), 9842–9855. DOI: 10.15376/BIORES.11.4.9842-9855

Sheoran, M., Goswami, S., Pant, H. J., Biswal, J., Sharma, V. K., Chandra, A., Dash, A. (2016). Measurement of residence time distribution of liquid phase in an industrial-scale continuous pulp digester using radiotracer technique. Applied Radiation and Isotopes, 111, 10–17. DOI: 10.1016/j.apradiso.2016.01.025

Sim, K., Youn, H. J., Cho, H., Shin, H., & Lee, H. L. (2012). Improvements in pulp properties by alkali pre-extraction and subsequent kraft pulping with controlling h-factor and alkali charge. BioResources, 7(4), 5864–5878. DOI: 10.15376/biores.7.4.5864-5878

Sinaga, I. (2008). Pengaruh H-Faktor terhadap Viskositas dan Bilangan Kappa Unbleach Diunit Digester di Pt Toba Pulp Lestari Tbk. Porsea. Institusi Universitas Sumatera Utara.

Supraptiah, E., Ningsih, A., S., Sofiah, & Apriandini, R. (2014). Pengaruh Rasio Cairan Pemasak (AA Charge) Pada Proses Pembuatan Pulp dari Kayu Sengon (Albizia Falcataria) Terhadap Kualitas Pulp.Kinetika, 5(1), 14–21.