Wet, pressure, partial oxidation of black liquor

Details Wet, pressure, partial oxidation of black liquor Wet, pressure, partial oxidation of black liquor

D - Textiles, Paper

21

C

6/47, 9/36.7

D21C 11/04 (2006.01)

Patent

CA 1267507

ABSTRACT OF THE INVENTION WET, PRESSURE, PARTIAL OXIDATION OF BLACK LIQUOR AND PRODUCTS THEREOF A wet, pressure, partial oxidation process to favour the partial oxidation of black liquor obtained from soda pulping. This is obtained by adjusting tge 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 favourably reduce lignin fragments into short chain organic acids and thereby increase 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 cian 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.

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