Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Digestion odor control
Patent
1982-07-08
1985-03-19
Doll, John
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Digestion odor control
162 3011, 252191, 252192, 423220, 423225, 423234, 423514, 423DIG3, C01B 1764, D21C 1108
Patent
active
045057761
ABSTRACT:
A composition is provided which comprises an aqueous alkaline solution of a metal salt and black liquor, the metal salt being selected from the group consisting of iron, chromium, cobalt and nickel salts. This composition is useful in a process described for absorption of hydrogen sulfide from flue gas, followed by subsequent oxidation of dissolved sulfide to thiosulfate, if desired. The presence of the metal ions and black liquor synergistically catalyzes the overall reaction of absorption of hydrogen sulfide, followed by oxidation of the sulfide. Preferably, prior to scrubbing to remove hydrogen sulfide with the solution, the flue gas is first cooled to near its dew point, and then scrubbed with water to remove particulates. Additionally, the effluent flue gas from the absorption step is usefully scrubbed with water to recover heat, following which it is used to scrub condensates from a kraft pulp mill. The metal salt in the solution is preferably an iron salt at a concentration of about 0.002 M., the black liquor concentration being preferably about 1% to 5% by volume of the solution, and the pH being usefully about 9.0 to 9.5.
REFERENCES:
patent: 1792097 (1931-02-01), Jacobson
patent: 1812099 (1931-06-01), Kohr
patent: 1815933 (1931-07-01), Sperr
patent: 3446573 (1969-05-01), Richter
patent: 3554859 (1971-01-01), Murray
patent: 3701824 (1972-10-01), Prabacs et al.
patent: 3752875 (1973-08-01), O'Hern
patent: 3794711 (1974-02-01), Bhatia et al.
patent: 3944402 (1976-03-01), Cheremisinoff
patent: 4049399 (1977-09-01), Teller
patent: 4067768 (1978-01-01), Mackie
patent: 4299652 (1981-11-01), Masuno
"Air Stripping Kraft Foul Condensates to Remove Methanol", Pulp & Paper Canada, vol. 80, No. 9, Sep. 1979, Blackwell et al.
Particle Conditioning by Steam Condensation, AIChE Symposium Series, vol. 71, No. 147, about 1976 or 1977, C. B. Prakash and F. E. Murray.
"Recovery Boilers-Emission Control with Product and Energy Recovery"; Pulp and Paper Canada, vol. 81, No. 12, Dec. 1980.
Doll John
Russel Jeffrey E.
Wescam Services Inc.
LandOfFree
Composition and method for treating flue gas and methanol contai does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Composition and method for treating flue gas and methanol contai, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Composition and method for treating flue gas and methanol contai will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-751762