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Abstract
The conversion of anthraquinone (AQ) to anthrahydroqutnone (AHQ) was determined by mixing AQ with typical pulping constituents (or models of) in a flow-through cell and filtering while hot. The very limited solubility of AQ in W NaOH at 160°C is increased significantly (by conversion to soluble AHQ−2) with glucose, kraft lignin, or sodium sulfide. The flow-through filtering cell has also been used to estimate effective methods for reducing AQ and AQ-analogs to AHQ species and to attempt to recover AQ from pulping liquors.
