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2004•Transactions of China Pulp and PaperRequires access

Study of AQ Effectiveness during Kraft-AQ Pulping

Xin‐Sheng Chai, Hyoung Chul Yoon

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Abstract

Studies of the effectiveness of AQ in kraft-AQ pulping in terms of its mechanism of mass transport were conducted. Experiments showed an apparent solubility of anthraquinone (AQ) in caustic solutions containing wood lignin, the solubility of AQ in a caustic solution containing 40 g/L dissolved lignin can be up to 0.14 g/L at 90℃. However, its “dissolution” is a slow process, even taking up to 30 minutes for complete “dissolution”. The adsorption behavior of AQ micro particles was also observed. It concluded that AQ “dissolving” and adsorption play an important role in alkaline delignification process. Some explanations for unexplained observations and suggestions are proposed.

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What this paper is about

Studies of the effectiveness of AQ in kraft-AQ pulping in terms of its mechanism of mass transport were conducted. Experiments showed an apparent solubility of anthraquinone (AQ) in caustic solutions containing wood lignin, the solubility of AQ in a caustic solution containing 40 g/L dissolved lignin can be up to 0.14 g/L at 90℃. However, its “dissolution” is a slow process, even taking up to 30 minutes for complete “dissolution”. The adsorption behavior of AQ micro particles was also observed. It concluded that AQ “dissolving” and adsorption play an important role in alkaline delignification process. Some explanations for unexplained observations and suggestions are proposed.

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Available abstract

Studies of the effectiveness of AQ in kraft-AQ pulping in terms of its mechanism of mass transport were conducted. Experiments showed an apparent solubility of anthraquinone (AQ) in caustic solutions containing wood lignin, the solubility of AQ in a caustic solution containing 40 g/L dissolved lignin can be up to 0.14 g/L at 90℃. However, its “dissolution” is a slow process, even taking up to 30 minutes for complete “dissolution”. The adsorption behavior of AQ micro particles was also observed. It concluded that AQ “dissolving” and adsorption play an important role in alkaline delignification process. Some explanations for unexplained observations and suggestions are proposed.

Key concepts: Dissolution, Solubility, Kraft paper, Caustic (mathematics), Chemistry, Lignin, Kraft process, Anthraquinone

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