Device for recovering sulfuric acid from graphene acid-containing wastewater and corresponding technique thereof

Abstract

The invention provides a device for recovering sulfuric acid from graphene acid-containing wastewater, which can purify sulfuric acid from graphene wastewater to achieve the goal of cyclic utilization of resources. The recovery rate of the acid liquor is up to 92-95%. The device can recover most of heat in the operation process, thereby saving the electric power by about 30%. The device comprises a waste liquor storage tank, and is characterized by also comprising a condensation part and a distillation part, wherein the condensation part comprises two condensation units, a condensation rectification unit and a condensation heating unit; the two condensation units are respectively a first condensation unit and a second condensation unit; the first condensation unit and the second condensation unit are respectively provided with an inner cavity and an outer cavity; the lower outlet of the condensation rectification unit is communicated with the inlet of the inner cavity of the first condensation unit; the outlet of the inner cavity of the first condensation unit is communicated to a sulfuric acid container; the outlet of the condensation heating unit is provided with a condensation distillation flask; and the outlet of the condensation distillation flask is connected to the inlet of the inner cavity of the second condensation unit.

Description

technical field [0001] The invention relates to the technical field of recovering sulfuric acid from wastewater, in particular to a device for recovering sulfuric acid from graphene acid-containing wastewater, and the invention also provides a process for recovering sulfuric acid from graphene acid-containing wastewater. Background technique [0002] Graphene is a single-layer carbon atomic surface material exfoliated from graphite materials. It is a two-dimensional structure of carbon and is a "super material". Future space elevators can use graphene as a raw material. The preparation of graphene is mainly based on graphite, concentrated sulfuric acid, potassium permanganate, and hydrogen peroxide. During the preparation process, a large amount of cleaning wastewater and filtrate will be generated. Therefore, the graphene production wastewater contains sulfuric acid, potassium permanganate, and hydrogen peroxide. Potassium manganate, hydrogen peroxide and other components,...

AI Technical Summary

Problems solved by technology

However, the traditional concentration method is very corrosive to the equipment, and the neutralization method cannot effectively recover the sulfuric acid in it.

At present, the more advanced solvent extraction method has high requirements on the extractant, which is not suitable for large-scale industrial production; the ion exchange method is affected by the ion resin, and has higher requirements for the adsorption of ions in the waste acid solution, and its specific conditions once Definitely, it is required that the composition of the stock solution cannot change too much; while the membrane separation technology has a small processing capacity and high investment costs

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