Wet, pressure, partial oxidation of black liquor

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

1987-04-09

1988-07-12

Wyse, Tom

Liquid purification or separation

Processes

Chemical treatment

210928, 162 16, 162 29, 162189, C02F 174, D21C 1114

Patent

active

047568372

ABSTRACT:
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.

REFERENCES:
patent: 2665249 (1954-01-01), Zimmermann
patent: 2774666 (1956-12-01), Barton et al.
patent: 3806403 (1974-04-01), Ferguson
patent: 3833463 (1974-09-01), Croom
patent: 3870631 (1975-03-01), Fassell et al.
patent: 3876497 (1975-04-01), Hoffman
patent: 3920506 (1975-11-01), Morgan
patent: 4017421 (1977-04-01), Othmer
patent: 4058433 (1977-11-01), Fuller et al.
"The Zimmermann Process in Soda Pulp Mill Recovery Systems", J. E. Morgan and C. M. Saul, Appita, vol. 22, No. 3 (Nov. 1968).
"The Wet Air Oxidation (WAO) of Waste", D. F. Othmer, Mechanical Engineering (Dec. 1979), pp. 30-37.

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