Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Including recovery of organic by-product
Patent
1998-07-29
2000-10-24
Nguyen, Dean T.
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Including recovery of organic by-product
162 3011, 264 3729, 422169, 423175, 4232421, 4232453, D21C 1106, D21C 1104
Patent
active
061361445
ABSTRACT:
The present invention reduces the sulfur and odor emissions from a paper-making Kraft process by recovering the sulfur in the non-combustible gases (NGCs) emitted by the Kraft process. In a first embodiment of the invention, the NGCs are flamelessly oxidized in a flameless thermal oxidizer to form a sulfur oxide-containing, gaseous products stream. The gaseous products stream is scrubbed with a scrubber solution stream to remove the sulfur components resulting in a scrubbed gas stream and spent scrubber solution stream having S.sub.2 O.sub.3 and SO.sub.4, and SO.sub.3 soluble salts. At least a portion of the spent scrubber solution from the scrubber is directed back into the Kraft process, thus recovering the sulfur. In a second general embodiment of the invention, the NGCs are flamelessly oxidized in a moving, packed bed calcinator. The calcinator receives a lime mud stream from the Kraft process, forms a packed bed therefrom, calcines the packed bed, and releases it as a quick lime stream. Concurrently, the NCGs are directed through the moving, packed bed and are flamelessly oxidized in a reaction wave in the packed bed to form a gaseous products stream with sulfur components. The sulfur components react with the packed bed to form sulfur/calcium components. The sulfur/calcium components exit the calcinator with the quick lime stream and are recovered by the Kraft process.
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Martin Richard J.
Schofield John T.
Nguyen Dean T.
Thermatrix Inc.
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