Process for recovering so2 from waste gases |
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| 申请号 | US3627464D | 申请日 | 1967-11-09 | 公开(公告)号 | US3627464A | 公开(公告)日 | 1971-12-14 |
| 申请人 | WELLMAN LORD INC; | 发明人 | TERRANA JACK D; MILLER LEO A; | ||||
| 摘要 | PROCESS AND APPARATUS FOR THE RECOVERY OF SULFUR DIOXIDE FROM SO2-CONTAINING GASES IN A SYSTEM INVOLVING CONTACTING THE GAS WITH AN AQUEOUS SULFITE SOLUTION TO PRODUCE A SOLUTION OF THE CORRESPONDING BISULFITE WHICH IS A PRECURSOR OF SO2 AND SUBSEQUENTLY SEPARATING THE BISULFITE AND SO2-PARTIAL PRESSURE LOWING MATERIALS TO OBTAIN PURER BISULFITE WHICH IS THEN DECOMPOSED TO REGENERATE SULFUR DIOXIDE. EXAMPLES OF SULFITES INCLUDE POTASSIUM, CESIUM, AND RUBIDIUM SULFITES. IN THE PROCESS SEPARATION OF THE BISULFITE IS ACCOMPLISHED BY VAPORIZATION OF WATER FROM THE BISULFITE-CONTAINING SOLUTION, E.G. IN A FLASH CHAMBER TO SUPERSATURATE THE SOLUTION AND PRECIPITATE THE BISULFITE, E.G. IN AN AMOUNT EQUIVALENT TO THE AMOUNT OF THE SULFUR DIOXIDE REMOVED FROM THE WASTE GASES. CONDITIONS ARE CHOSEN TO PRECIPITATE CRYSTALS HAVING A SIZE SUITABLE FOR VACUUM DRUM FILTERING. THE CRYSTALS ARE ADVANTAGEOUSLY REDISSOLVED PRIOR TO HEATING TO REGENERATE THE SULFUR DIOXIDE AND A PORTION OF THIS SOLUTION IS USED TO WASH THE CRYSTALS ON THE DRUM FILTER AND IMPROVE THE PURITY THEREOF. | ||||||
| 权利要求 | |||||||
| 说明书全文 | |||||||
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