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US 4,756,837 AGranted
Wet, pressure, partial oxidation of black liquor
AssigneeDomtar Inc.
InventorAlex Nadezhdin
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AssigneeDomtar Inc.
InventorAlex Nadezhdin
Estimating the term…
A wet, pressure, partial oxidation process to favor the partial oxidation of black liquor obtained from soda pulping. This is obtained by adjusting the equivalent of sodium ion content of a soda pulping black liquor within the range of about 21 to 26 weight % based on the total weight of the dissolved black liquor solids. This adjustment favorably reduces lignin fragments into short chain organic acids and thereby increases their production. In the case of potassium, the adjustment of the sodium content is carried out using an equivalent amount of a molar basis of potassium ion. A product wherein the amount of short chain organic acid salts is between 70 and 90%, the amount of aromatic lignin fragments and aromatic products thereof is between 0 and 10% and sodium carbon/bicarbonate mixture constitutes not more than 20% on the dry solids basis is also disclosed.
In a process involving a wet, pressure, partial oxidation of black liquor to favour short chain aliphatic acid formation the improvement comprising:
Dependencies are inferred from the claim text.