Method for preparing isooctyl thioglycolate by utilizing thionocarbamate tail liquid

The invention discloses a method for preparing isooctyl thioglycolate by utilizing thionocarbamate tail liquid, which is characterized by comprising the following process steps of: impurity removal and acidification, Zn powder decolorizing, extraction, crude distillation and rectification. The method has the beneficial effects that the impurity removal and the acidification are integrated, an efficient benzene extraction agent is adopted for replacing ethyl ether to reduce the risk and the pollution and the operation steps are also simplified, and meanwhile, the efficient benzene extraction agent can be recycled and is convenient to operate; a zinc powder decoloring process is increased, so that the he product quality stability is ensured; the esterification reaction is finished at the same time in the crude distillation process, and a qualified coarse ester semi-product is obtained at one time, so that the operation steps are reduced, and the efficiency is improved; and through direct rectification, a distillation kettle substrate is left in a crude distillation process, and no rectification kettle substrate is generated, so that the production capacity and the product yield are improved, and the cost is reduced.