Exhaust gas clean up process

Details Exhaust gas clean up process Exhaust gas clean up process

1988-06-16

1989-04-11

Niebling, John F.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

423235, 423242, 423243, B01D 1302

Patent

active

048203912

ABSTRACT:
A method of cleaning an exhaust gas containing particulates, SO.sub.2 and NO.sub.x includes prescrubbing with water to remove HCl and most of the particulates, scrubbing with an aqueous absorbent containing a metal chelate and dissolved sulfite salt to remove NO.sub.x and SO.sub.2, and regenerating the absorbent solution by controlled heating, electrodialysis and carbonate salt addition. The NO.sub.x is removed as N.sub.2 or nitrogen-sulfonate ions and the oxides of sulfur are removed as a vaulable sulfate salt.

REFERENCES:
patent: 3554895 (1971-01-01), McRae et al.
patent: 4044101 (1977-08-01), Hisamatsu et al.
patent: 4091074 (1978-05-01), Gorai et al.
patent: 4107015 (1978-08-01), Chlanda et al.
patent: 4615780 (1986-10-01), Walker
patent: 4629545 (1986-12-01), Mani et al.
Walker et al., Aqueous Absorbents and Membranes for a New Flue Gas SO.sub.2 and NO.sub.x Removal Process Using Electrodialysis for Regeneration, Paper No. 128c, U.S. Doe, Pittsburgh, PA., Nov. 2, 1986.
Walker et al., Evaluation of Advanced Separation Techniques for Application to Flue Gas Cleanup Processes for the Simultaneous Removal of Sulfur Dioxide and Nitrogen Oxides, DOE/PETC/TR-85/7, Jun. 1985.

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