Methods for removing malodorous sulfur compounds from pulp mill flue gases and the like by using green liquor
This is an improved method for removing malodorous sulfur compounds from flue gases generated in kraft or sodium sulfite pulping operations and the like by the absorption process using green liquor, an aqueous solution containing sodium sulfide and sodium carbonate. The malodorous gas compounds, including hydrogen sulfide, methyl mercaptan, and dimethyl sulfide are preferentially absorbed by the sodium sulfide forming sodium hydrosulfide and methanol. Any sulfur dioxide in the gas is absorbed and neutralized by sodium carbonate. In this method carbon dioxide absorption is minimized and the formation of sodium bicarbonate is limited. Sodium bicarbonate formation is minimized in order to avoid its reaction with sodium hydrosulfide which would then release undesirable hydrogen sulfide during absorption, as well as to forestall the need to increase chemical and lime kiln capacity requirements when the green liquor returned to the kraft recovery process contains excess amounts of sodium bicarbonate.
- Assignee:
- EDB-84-115235
- Patent Number(s):
- US 4431617
- OSTI ID:
- 6767220
- Resource Relation:
- Patent File Date: Filed date 9 Jul 1982; Other Information: PAT-APPL-396743
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
01 COAL, LIGNITE, AND PEAT
42 ENGINEERING
FLUE GAS
DESULFURIZATION
SCRUBBING
SULFUR COMPOUNDS
ABSORPTION
AQUEOUS SOLUTIONS
COUNTERFLOW SYSTEMS
HYDROGEN SULFIDES
PACKINGS
PAPER INDUSTRY
PH VALUE
PROCESS SOLUTIONS
REGENERATION
SODIUM CARBONATES
SODIUM SULFIDES
SULFITES
SULFUR DIOXIDE
ALKALI METAL COMPOUNDS
CARBON COMPOUNDS
CARBONATES
CHALCOGENIDES
CHEMICAL REACTIONS
DISPERSIONS
GASEOUS WASTES
HYDROGEN COMPOUNDS
INDUSTRY
MIXTURES
OXIDES
OXYGEN COMPOUNDS
SODIUM COMPOUNDS
SOLUTIONS
SULFIDES
SULFUR OXIDES
WASTES
WOOD PRODUCTS INDUSTRY
020800* - Petroleum- Waste Management
010800 - Coal
Lignite
& Peat- Waste Management
424000 - Engineering- Pollution Control Equipment- (1980-1989)