Production of Sodium Acetate, Acetic Acid and Caustic from Kraft Pulp Mill Extract using Electrodialysis, 2016 Pulping, Engineering, Environmental, Recycling, Sustainability (PEERS) Conference Proceedings
Acetyl groups in wood hemicellulose can be hydrolyzed to sodium acetate by using dilute caustic at low temperature (50 0C) prior to the Kraft pulping process. This extraction process is also called as the first stage of a two-stage pulping process. Sodium acetate can be separated from the extract using conventional electrodialysis (ED). Alternatively, it can also be converted into acetic acid and caustic using bi-polar membrane electrodialysis (BPMED) by salt splitting.
This paper presents the results of the batch experiments performed to demonstrate the processing of pre-treated hardwood extracts in ED and BPMED. Two types of pre-treated extracts were evaluated. These are: (1) the raw extract obtained directly from the extraction process and (2) extract which had been clarified using activated carbon to remove lignin which decolorizes the extract. The pre-treated extracts included smaller quantities of lignin, sugars and sodium salts; notable among which is sodium formate, sodium lactate and sodium glycolate in addition to sodium acetate.
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