NaOH concentration of the steeping liquor as a factor in the solubility of the cellulose xanthate and the properties of the regenerated cellulose

Лазурина, Л. П.; Rogovin, Z. A.

doi:10.1007/bf00549215

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“…The final cellulose properties are influenced by NaOH concentration during the alkali/cellulose conversion and xanthification processes. The NaOH concentration also plays a role in the thiocarbonates formation, which then negatively influences the CS 2 consumption, quality, and yield of cellulose (Lazurina and Rogovin 1980). Moreover, insufficient decomposition of these carbonates can change the carbon isotopes ratios.…”

Section: Viscosementioning

confidence: 99%

Alternative Methods for Cellulose Preparation for AMS Measurement

Němec

Wacker²,

Hajdas³

et al. 2010

Radiocarbon

117

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ABSTRACT.The main methods applied to clean plant material for radiocarbon dating are not compound-specific and generally remove only the easily exchangeable components by an acid-base-acid sequence and additional optional steps like Soxhlet extraction to remove resins and oxidative bleaching with NaClO 2 . The products are normally clean enough for standard 14 C measurement, but in some cases it is desirable to have pure cellulose, which remains unchanged and immobile over longer time ranges, better representing the original plant material. In this work, 2 more compound-specific but still simple methods were tested to separate the cellulose from wood. The viscose method is based on the xanthification process used in the textile industry, where the alkali-cellulose with CS 2 forms a soluble cellulose xanthate, which is then extracted and cellulose is recovered. The second procedure is based on the wood/cellulose dissolution in ionic liquid 1-butyl-3-methylimidazolium chloride [BMIM]Cl, when the dissolved cellulose could be precipitated again by simply adding a water-acetone mixture. This process was recently reported, but still not used in sample preparation procedures for 14 C dating.

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Section: Viscosementioning

confidence: 99%