The Effect of Active Alkali and Sulfidity Loading on the Kraft Pulp Properties of Sweet Sorghum Bagasse

Azizatul Karimah, Nissa Nurfajrin Solihat, Novitri Hastuti, Maya Ismayati, Riksfardini Anissa Ermawar, Asma Sohail, Apri Heri Iswanto, Harits Atika Ariyanta, R. A. Ilyas, Rudi Dungani, Widya Fatriasari*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)


A study was carried out to observe how active alkali and sulfidity loading affect the kraft pulp characteristics of sweet sorghum bagasse (SSB). SSB pulp was obtained from the kraft pulping with a variation of active alkali (17, 19, and 22%) and sulfidity loading percentage (20, 22, and 24%). The chemical functional group and composition, morphological properties, crystallinity, and pyrolysis product of the resulting pulp were characterized. Based on Fourier transform infrared characterization, SSB pulp demonstrated a peak absorption showing the existence of cellulose, lignin, and hemicellulose. The fibril was found clearly in the pulp fibers of SSB. The crystallinity of treated SSB was higher than that of untreated samples. The Gaussian function gave more accuracy for crystallinity determination (indicated by an R 2 value that was relatively higher than the Lorentzian function). It is consistent with Raman spectra in this study, which showed a specific band at 370–380 and ~ 1090 cm−1 from cellulose. The higher carbohydrate content of SSB pulp showed that the delignification process using kraft pulping with a variation of alkali active and sulfidity loading could be an alternative method to cellulose recovery for cellulose-derived products.

Original languageEnglish
Pages (from-to)1196-1210
Number of pages15
JournalSugar Tech
Issue number5
Publication statusPublished - Oct 2023
MoE publication typeA1 Journal article-refereed


  • Cellulose derivatives
  • Chemical properties
  • Kraft pulp
  • Morphological analysis
  • Spectroscopy analysis
  • Sweet sorghum bagasse


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