While the highest swelling ratios of the parent lignites were obtained in ethylenediamine, those of acid-treated samples were obtained in pyridine and dimethylformamide.
📌 3 Key Takeaways
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Objective & Hypothesis:To remove $Ca^{2+}$ ions, six low rank coals and one coking coal were treated with 0.1 and l.0 N HC1 for 24 h.
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Key Findings & Data:The swelling ratios of parent and acid-treated coal samples showed that removal of $Ca^{2+}$ resulted in an increase in the swelling ratios.
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Conclusion & Impact:While the highest swelling ratios of the parent lignites were obtained in ethylenediamine, those of acid-treated samples were obtained in pyridine and dimethylformamide.
🔬Design:Research Article
📍Scope:Comprehensive Sample
⚙️Variables:Domain Parameters
Abstract
To remove $Ca^{2+}$ ions, six low rank coals and one coking coal were treated with 0.1 and l.0 N HC1 for 24 h. IR spectra and proximate analysis of the lignites indicated that only slight structural changes had occurred during acid treatment. The swelling ratios of parent and acid-treated coal samples showed that removal of $Ca^{2+}$ resulted in an increase in the swelling ratios. Higher swelling ratios were obtained with acid-washed coal samples. While the highest swelling ratios of the parent lignites were obtained in ethylenediamine, those of acid-treated samples were obtained in pyridine and dimethylformamide.
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Cite This Article
TOĞRUL, T., MESCİ, N., ŞENELT, A., OLCAY, A. (2022). Effect of acid treatment on volltmetric swelling ratios of coals. Turkish Journal of Chemistry, Cilt: 25 - Sayı: 4, 397–403. https://ajindex.com/articles/602380