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Title: Desulfurization process uses electrodialysis

Abstract

A method for stack gas desulfurization based on bipolar membrane technology is described. The process is a regenerative type. Sulfur dioxide is removed from the flue gas by scrubbing the gas with a highly alkaline solution of sodium sulfide/sodium hydroxide/sodium carbonate. In the absorber, sulfur dioxide is converted to sodium bisulfite. Sodium sulfate also is formed in the absorber as a result of oxidation of sulfite species, the research workers explain. Spent absorber solution is filtered to remove particulate and cooled to about 110/sup 0/F before being fed into the electrodialysis section for regeneration. The water splitting section consists of two identical parallel trains, each of which contains three stages. Acid solution from the splitters, consisting of a sodium sulfate solution saturated with sulfur dioxide, is transferred to a stripper, where the solution is heated by direct injection of steam. Sulfur dioxide from the stripper, combined with the sulfur dioxide from the recirculation tanks, then can be further processed to sulfur or sulfuric acid or can be liquefied. Bottoms from the stripper consist of a nearly pure solution of sodium sulfate. Most of it is recycled to the absorber, but sulfate must be removed in an amount equivalent to thatmore » formed by oxidation in the absorber. This is done by feeding some of the bottoms to an evaporator where water is removed. Sodium sulfate is filtered and dried. Sodium values lost with the sulfate are made up through addition of sodium carbonate to the absorber scrubbing solution.« less

Publication Date:
OSTI Identifier:
7219367
Resource Type:
Journal Article
Journal Name:
Chem. Eng. News; (United States)
Additional Journal Information:
Journal Volume: 55:38
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; FLUE GAS; DESULFURIZATION; SULFUR DIOXIDE; REMOVAL; COAL; COMBUSTION PRODUCTS; ELECTRODIALYSIS; FOSSIL-FUEL POWER PLANTS; RECYCLING; SCRUBBING; SODIUM CARBONATES; SODIUM HYDROXIDES; SODIUM SULFIDES; WATER; ALKALI METAL COMPOUNDS; CARBON COMPOUNDS; CARBONACEOUS MATERIALS; CARBONATES; CHALCOGENIDES; CHEMICAL REACTIONS; DIALYSIS; ENERGY SOURCES; FOSSIL FUELS; FUELS; GASEOUS WASTES; HYDROGEN COMPOUNDS; HYDROXIDES; OXIDES; OXYGEN COMPOUNDS; POWER PLANTS; SEPARATION PROCESSES; SODIUM COMPOUNDS; SULFIDES; SULFUR COMPOUNDS; SULFUR OXIDES; THERMAL POWER PLANTS; WASTES; 010800* - Coal, Lignite, & Peat- Waste Management

Citation Formats

. Desulfurization process uses electrodialysis. United States: N. p., 1977. Web.
. Desulfurization process uses electrodialysis. United States.
. 1977. "Desulfurization process uses electrodialysis". United States.
@article{osti_7219367,
title = {Desulfurization process uses electrodialysis},
author = {},
abstractNote = {A method for stack gas desulfurization based on bipolar membrane technology is described. The process is a regenerative type. Sulfur dioxide is removed from the flue gas by scrubbing the gas with a highly alkaline solution of sodium sulfide/sodium hydroxide/sodium carbonate. In the absorber, sulfur dioxide is converted to sodium bisulfite. Sodium sulfate also is formed in the absorber as a result of oxidation of sulfite species, the research workers explain. Spent absorber solution is filtered to remove particulate and cooled to about 110/sup 0/F before being fed into the electrodialysis section for regeneration. The water splitting section consists of two identical parallel trains, each of which contains three stages. Acid solution from the splitters, consisting of a sodium sulfate solution saturated with sulfur dioxide, is transferred to a stripper, where the solution is heated by direct injection of steam. Sulfur dioxide from the stripper, combined with the sulfur dioxide from the recirculation tanks, then can be further processed to sulfur or sulfuric acid or can be liquefied. Bottoms from the stripper consist of a nearly pure solution of sodium sulfate. Most of it is recycled to the absorber, but sulfate must be removed in an amount equivalent to that formed by oxidation in the absorber. This is done by feeding some of the bottoms to an evaporator where water is removed. Sodium sulfate is filtered and dried. Sodium values lost with the sulfate are made up through addition of sodium carbonate to the absorber scrubbing solution.},
doi = {},
url = {https://www.osti.gov/biblio/7219367}, journal = {Chem. Eng. News; (United States)},
number = ,
volume = 55:38,
place = {United States},
year = {Mon Sep 19 00:00:00 EDT 1977},
month = {Mon Sep 19 00:00:00 EDT 1977}
}