Process for carrying out impurity removal on syrup technical extract for nourishing yin to clear away lung-heat by flocculation and subsequent separation

The invention provides a process for carrying out impurity removal on a syrup technical extract for nourishing yin to clear away lung-heat by flocculation and subsequent separation. The process comprises the following steps: respectively adding a proper amount of ZTC1 plus 1 flocculating agent and chitosan in syrup technical water extract for nourishing yin to clear away lung-heat and alcohol extraction solution; removing impurities by flocculation under the stirring condition; after carrying out gravitational settling or centrifugal settling on the flocculated liquid medicine, filtering sediment by a filter press; combining filtrate with the settled supernate; filtering by a micro filtration membrane to obtain a clarified liquid medicine; respectively condensing the treated water extract solution and the alcohol extraction solution to be a proper amount; combining the concentrate, adding 0.3 percent sodium benzoate and uniformly stirring; and adding syrupus simplex and mint camphor, uniformly stirring, stand