Abstract: A novel chemical process is introduced for the treatment of coal-gasification wastewater produced from Lurqi gasification，and the process has been industrially realized. Ammonia and acidic gas in coal-gasification wastewater are removed through a sour water stripping tower in the new process，through which the pH value of the treated wastewater is decreased from 9—11 to 7，and hence it is beneficial to the subsequent solvent extraction for phenols. The distribution coefficients of MIBK to phenol and polyhydric phenols are greater than those of DIPE. The application of MIBK as extraction solvent would recover more phenolic substances from wastewater than DIPE. The COD value would be further reduced before the coal-gasification wastewater flowed into the biochemical treatment.

摘要： 针对鲁奇加压气化工艺产生的煤气化污水处理现有流程特点提出一种新的化工处理过程，并实现了工业化。分别介绍煤气化污水化工流程处理的新老过程。新流程中，采用酸水汽提塔同时脱除煤气化污水中的氨气和酸性气体，氨气脱除后的煤气化污水pH值由原先的9～11降低至7以下，有利于后续溶剂萃取脱酚。而萃取溶剂甲基异丁基甲酮（MIBK）相比二异丙醚（DIPE）对污水中单元酚和多元酚有更高的分配系数，MIBK的萃取应用将从污水中回收更多的酚类成分，从而在煤气化污水生化处理前COD能进一步降低。