▎ 摘　　要

NOVELTY - Device comprises a waste liquid storage groove, a condensing section and a distilling section. The condensing section comprises two condensing units a first condensing unit and a second condensing unit, a condensing-heating unit and a condensing-distilling unit. The two condensing units are first condensing unit and second condensing unit. The first condensing unit and the second condensing unit are arranged in an inner cavity and an outer cavity. The bottom outlet of the condensing-distilling unit is connected with the inner cavity inlet of the first condensing unit. USE - The device is useful for recovering sulfuric acid from graphene-containing acid wastewater (claimed). ADVANTAGE - The device realizes complete utilization of resources, has acid recovery rate of 92-95%, and has high heat recovery rate and saves 30% energy. DETAILED DESCRIPTION - Device comprises a waste liquid storage groove, a condensing section and a distilling section. The condensing section comprises two condensing units a first condensing unit and a second condensing unit, a condensing-heating unit and a condensing-distilling unit. The two condensing units are first condensing unit and second condensing unit. The first condensing unit and the second condensing unit are arranged in an inner cavity and an outer cavity. The bottom outlet of the condensing-distilling unit is connected with the inner cavity inlet of the first condensing unit. The inner cavity outlet of the first condensing unit is connected with a sulfuric acid storing device. The outlet of the condensing-heating unit is arranged with a condensing-distilling bottle. The outlet of the condensing-distilling bottle is connected with inner cavity inlet of the second condensing unit. The inner cavity outlet of the second condensing unit is connected with inlet of the condensing-distilling unit. The upper outlet of the condensing-distilling unit is externally connected with a heating system through a water vapor conveying tube. The distilling section comprises N sections including first distilling section and second distilling section, where N is a natural number of value greater than or equal to 1. The distilling section comprises a heating unit, a distilling flask and a distilling unit. The outer cavity outlet of the second condensing unit is connected with liquid inlet of the first distilling section of the heating unit via a conveying tube. The upper outlet of the heating unit of the first distilling section is connected with the distilling flask inlet of the first distilling section. The outlet of the distilling flask is connected with an inlet of the distilling unit of the first distilling section. The bottom outlet of the distilling unit of the first distilling section is connected with a liquid inlet of the heating unit of the second distilling section. The upper outlet of the heating unit of the second distilling section is connected with an inlet of the distilling flask of the second distilling section. The outlet of the second distilling flask is connected with an inlet of the distilling unit of the second distilling section. The bottom outlet from the N-distilling section to distilling unit is connected with a liquid inlet of the condensing-heating unit. The upper outlet of the each distilling unit within the distilling section is externally connected with the heating system through the water vapor conveying tube. An INDEPENDENT CLAIM is also included for recovering sulfuric acid from graphene-containing acid wastewater, comprising heating waste liquid in condensing units, distilling for at least two times, conveying water vapor into the heating system and recovering sulfuric acid from waste liquid. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic representation of the device for recovering sulfuric acid from graphene-containing acid wastewater.