Application of Single Striping Tower in the Treatment of Wastewater from Lurgi Gasification

Abstract Single tower pressured stripping plant,as a new processing method,was used to treat production sewage from cleaning crude Lurgi gas containing dense phenol and ammoniain the sewage.In the tower,H2S and NH3 in the sewage exist as free molecular state in liquid,and transfer from liquid to vapor under the action of vacuum flash and steam stripping in the bottom of the tower,thus acid gas as CO2,H2S and NH3 are removed in the same pressured tower.Then the treated sewage enters into the follow-up extraction device,in which methyl isobutyl ketone(MIBK)is used as extractant.The ectraction is effective because MIBK has a high distribution coefficient of unit phenol and polyphenols.The extractant can be reused after recovery by means of stripping.By new processing method,the content of phenol,ammonia,hydrogen sulfide,and pH values in the treated sewage be can reduced significantly and the cost of production can be lowered.This provides more convenience to the next biological treatment of the sewage.The new processing method is becoming an ecological and effective way for treating sewage from production of Lurgi gas.

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	MENG Xiang-Qing
	MA Dong-Yun

Keywords�� Lurgi furnace production sewage compression stripper removal of CO₂,H₂S and NH₃

Cite this article:

MENG Xiang-Qing, MA Dong-Yun.Application of Single Striping Tower in the Treatment of Wastewater from Lurgi Gasification[J] Chemcial Industry and Engineering, 2010,V27(5): 429-433