Degradable-environment-friendly extracting agent and method for separating molybdenum, tungsten, manganese and rhenium in industrial wastewater by using degradable-environment-friendly extracting agent

The invention provides a degradable and environment-friendly extracting agent and a method for separating molybdenum, tungsten, manganese and rhenium in industrial wastewater by the degradable and environment-friendly extracting agent, and relates to the technical field of purification of heavy metals in the industrial wastewater. The preparation method comprises the following steps of: adding a chelating agent into a crab claw-shaped chelating fragment, and finally activating nitrogen atoms in the chelating fragment through quaternization reaction. The skeleton of the aliphatic chain-like derivatized end-group bisamide ensures the surface hydrophilic capacity of the extraction agent to the maximum extent, and a heterogeneous interface-chelation reaction is realized; an aliphatic chain hydroxyl group in a molecular tail end structure realizes extension of different dimensions of a subsequently introduced crab-claw-shaped chelating fragment space, and is beneficial to action with metal ions; in the whole molec