摘要
采用新的工艺方法即单塔加压汽提装置处理鲁奇炉煤制气过程中洗涤粗煤气所产生的含高浓度酚及氨等生产污水。该装置工作原理是在较高的温度下H2S、NH3都以游离的分子状态存在于液相中,在热料减压闪蒸和塔底蒸汽的汽提作用下,液相中的H2S、NH3分子由液相转入汽相实现汽提,将污水中的CO2、H2S等酸性气体和氨在同一个加压塔内脱除。处理后的污水进入后续的萃取装置,萃取剂是甲基异丁基酮(MIBK),MIBK对单元酚和多元酚分配系数都较高,萃取效果好,且萃取剂用汽提的方式回收后可再利用。处理后的污水酚、氨、硫化氢及pH值都有显著降低,不仅显著降低了生产成本而且给污水的后续生化处理提供了方便。该方法实践证明对处理鲁奇炉生产污水非常有效。
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.
出处
《化学工业与工程》
CAS
2010年第5期429-433,共5页
Chemical Industry and Engineering
