Proceedings of the 10th International Conference on Science and Technology (ICST 2024)

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Effect of pH on Calcium Removal in Dissolving Pulp in The First Stage of Bleaching

Authors
Valentina Mailita1, *, Joko Wintoko1, Indra Perdana1
1Department of Chemical Engineering, Faculty of Engineering, Universitas Gadjah Mada, Jl. Grafika No.2, Yogyakarta, 55281, Indonesia
*Corresponding author. Email: valentinamailita@mail.ugm.ac.id
Corresponding Author
Valentina Mailita
Available Online 1 July 2025.
DOI
10.2991/978-94-6463-772-4_19How to use a DOI?
Keywords
Rayon fibers; Calcium content; Calcium leaching; Dissolving pulp bleaching; Bleaching pH
Abstract

Dissolving pulp (DP) has a high cellulose content and low chemical components and is obtained from wood through PHK. It is a raw material for various cellulose products, such as viscose fibers, cellulose esters, and ethers. More than 70% of dissolving pulp is utilized in viscose fiber production. Rayon fibers, including viscose and lyocell, are regenerative cellulose fibers produced from natural cellulose that are chemically dissolved after spinning. The lyocell production process requires dissolving pulp with higher cellulose content and lower impurities such as hemicellulose, lignin, extractives, and metal ions like calcium, iron, and copper. Calcium ion reduction is related to the leaching mechanism from a solid, where the solid in question is the pulp itself. This research aims to analyze the effect of the first-stage bleaching pH and process temperature on calcium reduction in the first stage of bleaching. Unbleached dissolving pulp pH with an initial 9.8 was adjusted to a target range of 1.5 to 3.5 using hydrochloric acid, significantly affecting the process outcomes. The findings indicate that while a pH of 1.5 achieved the highest calcium removal (approximately 80.24%), this lower pH slightly compromised delignification efficiency compared to pH levels between 2.5 and 3.5.

Copyright
© 2025 The Author(s)
Open Access
Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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Volume Title
Proceedings of the 10th International Conference on Science and Technology (ICST 2024)
Series
Advances in Engineering Research
Publication Date
1 July 2025
ISBN
978-94-6463-772-4
ISSN
2352-5401
DOI
10.2991/978-94-6463-772-4_19How to use a DOI?
Copyright
© 2025 The Author(s)
Open Access
Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

Cite this article

risenwbib
TY  - CONF
AU  - Valentina Mailita
AU  - Joko Wintoko
AU  - Indra Perdana
PY  - 2025
DA  - 2025/07/01
TI  - Effect of pH on Calcium Removal in Dissolving Pulp in The First Stage of Bleaching
BT  - Proceedings of the 10th International Conference on Science and Technology (ICST 2024)
PB  - Atlantis Press
SP  - 198
EP  - 206
SN  - 2352-5401
UR  - https://doi.org/10.2991/978-94-6463-772-4_19
DO  - 10.2991/978-94-6463-772-4_19
ID  - Mailita2025
ER  -