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METHOD FOR REMOVING SODIUM SULPHATE FROM AQEUOUS SODIUM SULPHITE SOLUTIONS IN A SULPHUR DIOXIDE REMOVAL PROCESS
METHOD FOR REMOVING SODIUM SULPHATE FROM AQEUOUS SODIUM SULPHITE SOLUTIONS IN A SULPHUR DIOXIDE REMOVAL PROCESS
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机译:从二氧化硫去除过程中的亚硫酸钠水溶液中去除硫酸钠的方法
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摘要
Metal, e.g. sodium sulfate, is separated from metal, e.g. sodium sulfite, in a solution, for instance a solution used in a system involving contact of sulfur dioxide-containing gases with the sodium sulfite solution as an absorbing solution to recover sulfur dioxide wherein the absorbing solution is regenerated after contact with the gas and recycled for further use. A portion of the absorbing solution is purged to avoid the unduly large build-up of sodium sulfate in it. The purge stream is contacted with sulfur dioxide to reduce the amount of sodium sulfite therein to relatively soluble sodium bisulfite, and the relatively insoluble sodium sulfate is recovered therefrom as undissolved solids. The liquid separated from the sodium sulfate, which is rich in sodium bisulfite, is returned to the absorbing solution. In a preferred aspect, the purge stream is withdrawn from the absorbing solution subsequent to contact with the sulfur dioxide-containing gases and before regeneration.
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