首页>
外国专利>
Process for removing SO.sub.2 from effluent gases and for removing heat stable salts from systems in which they accumulate using an anion exchange resin
Process for removing SO.sub.2 from effluent gases and for removing heat stable salts from systems in which they accumulate using an anion exchange resin
展开▼
机译:用阴离子交换树脂从废气中除去SO 2并从积累有盐的系统中除去热稳定盐的方法
展开▼
页面导航
摘要
著录项
相似文献
摘要
Improvement in processes for the selective removal of sulfur dioxide with respect to carbon dioxide from a gas mixture containing same wherein the gas mixture is contacted with an aqueous absorbent solution, such as alkanolamine, alkali metal hydroxide, ammonium hydroxide or sulfites thereof, to remove sulfur dioxide from the gas mixture and form a SO.sub. 2 -rich aqueous absorbent solution which is moved to a stripping zone where sulfur dioxide is driven off to form a SO.sub.2 - depleted aqueous absorbent solution which is recycled and re-contacted with the gas mixture, the improvement comprising removing sulfur oxyanions of heat stable salts which accumulate in the aqueous absorbent solution by contacting a portion of it with an anion exchange resin having hydroxyl anions displaceable by the heat stable sulfur oxyanions whereby the hydroxyl anions of the resin are replaced by the heat stable divalent sulfur oxyanions which are thus taken out of the solution. The anion exchange resin preferably is a strong base anion exchange resin which can be regenerated by contacting it with aqueous sodium hydroxide to replace the heat stable sulfur oxyanions on said resin with hydroxyl anions.
展开▼