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Ceramic membranes coated with ZrO 2 were used for the continuous separation of a well-defined low molecular weight lignin from softwood and hardwood kraft black liquors on a pilot scale. The membranes used had M w cut-offs of 1000, 5000, and 15,000Da, respectively. The flux (permeate flow) through the different membranes measured as L/(m 2 .h) was studied by varying the inlet...
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