Recover method for useful tail gas components in acetic acid apparatus

The present invention relates to a recovery method for useful tail gas components in an acetic acid apparatus, wherein problems of complex process, high equipment investment, high cold quantity consumption and high methanol loss in the prior art are mainly solved. The technical scheme comprises that: tail gas from a reaction process and tail gas from a rectification process contact methanol in a tail gas absorption tower, the stream on the tail gas absorption tower top is conveyed to a torch system, and the stream on the tower kettle is cycled to the reaction process, wherein the methanol temperature is more than 0-12 DEG C. With the technical scheme, the problems in the prior art are well solved. The recovery method can be used for tail gas recovery of acetic acid synthesis through low pressure carbonylation of methanol in industrial production.