The extraction of thiocyanate(SCN-) from potassium thiocyanate(KSCN) solution and waste solution for coke oven gas desulfurization using tributyl phosphate(TBP) and affect of several factors were investigated.IR analysis shows that TBP is able to extract SCN-,but can not extract thiosulfate anion(S2O32-).For extaction from 6% KSCN solution with TBP,the single extraction rate of SCN-is 10.95% and the partition coefficient is 0.1230.SCN-is extracted by TBP via the formation of coordination bond.The main impacting factors on extraction includes phase ratio,extraction time,and the presence of NH4+.For extracting SCN-from diluted waste solution for coke oven gas desulfurization,the average single extraction rate is 15.39%,and the waste solution can be reused after desalting extraction.The single stripping rate is 61.73% using distilled water as strippant.The total stripping rate can reach 95.15%,after stripping for three times.For reuse of TBP that removed SCN-,it must be undergone further purification.
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