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
- Country of Publication:
- United States
- Language:
- English
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42 ENGINEERING
424000 -- Engineering-- Pollution Control Equipment-- (1980-1989)
ABSORPTION
ALKALI METAL COMPOUNDS
AQUEOUS SOLUTIONS
CARBON COMPOUNDS
CARBONATES
CHALCOGENIDES
CHEMICAL REACTIONS
COUNTERFLOW SYSTEMS
DESULFURIZATION
DISPERSIONS
FLUE GAS
GASEOUS WASTES
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
INDUSTRY
MIXTURES
OXIDES
OXYGEN COMPOUNDS
PACKINGS
PAPER INDUSTRY
PH VALUE
PROCESS SOLUTIONS
REGENERATION
SCRUBBING
SODIUM CARBONATES
SODIUM COMPOUNDS
SODIUM SULFIDES
SOLUTIONS
SULFIDES
SULFITES
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
WASTES
WOOD PRODUCTS INDUSTRY