Electrodialysis field test for selective chloride removal from the chemical recovery cycle of a kraft pulp mill
- Inst. of Paper Science and Technology, Atlanta, GA (United States)
Chloride accumulation is a serious issue in the kraft pulping process. Chloride can be selectively removed from dissolved electrostatic precipitator dust (ESP dust) in the kraft chemical recovery cycle by electrodialysis with monovalent-selective anion-exchange membranes. In a pilot-scale field test, this process was investigated (total run time, 750 h). The test was performed at about 3.5% of full scale. The process showed outstanding performance and no significant membrane fouling. In feed-and-bleed operation, chloride removal levels of 94% and 61% were tested. The energy consumption for electrodialysis is low (120 kWh per metric ton of chloride removed at a 63% chloride removal level). The process performed very well even with no feed pretreatment, polarity reversal, or membrane cleaning.
- OSTI ID:
- 321081
- Journal Information:
- Industrial and Engineering Chemistry Research, Vol. 37, Issue 12; Other Information: PBD: Dec 1998
- Country of Publication:
- United States
- Language:
- English
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