Equipment and process for industrially producing graphene by microwaves

Abstract

The invention relates to equipment and process for industrially producing graphene by microwaves. The equipment comprises a spiral feeder, a furnace tube, a microwave cavity, a material discharging pipe and a product collector, wherein the furnace tube is connected to the microwave cavity in a penetrating manner; the input end of the furnace tube is connected with the spiral feeder; the output end of the furnace tube is connected with the product collector through the material discharging pipe; an inert gas inlet and a compressed air inlet are formed in the input end of the furnace pipe. Graphite is oxidized into oxidized graphite under the action of strong acid and strong oxidant such as H2SO4, HNO3 and HClO4s or is hydrolyzed into oxidized graphite under the electrochemical peroxidation effect; the oxidized graphite is prepared after being subjected to filtering, granulation and the like; inert gas is used for replacing air in the furnace tube; under the inert gas atmosphere, the oxidized graphite is dissociated by the microwaves and is reduced into flocculent graphene easy to fly; the compressed air inlet is opened, and the reduced graphene enters the product collector along with the compressed air and is completely absorbed by water pre-stored in the device; suspension is filtered and dried to be solid powder, so that the production process for the graphene is finished.

Description

technical field [0001] The invention relates to a technology for preparing new graphene materials, in particular to an equipment and process for industrially producing graphene using microwaves. Background technique [0002] Graphene is a layer of carbon atoms with a thickness of one atom. It is a two-dimensional single layer of carbon atoms arranged in a honeycomb crystal lattice (honeycomb crystal lattice) in a hexagonal plane with a thickness of only a single layer of atoms formed by sp2 hybridized carbon atoms. crystals. Graphene is the thinnest known material, and it is also very strong and hard; as a single substance, it can transfer electrons faster than all known conductors and semiconductors at room temperature (the migration speed of electrons in graphene reaches the speed of light 1 / 300 of). At the same time, as a single-layer carbon atom structure, the theoretical specific surface area of ​​graphene is as high as 3000m2 / g. Such a high specific surface area mak...

AI Technical Summary

Problems solved by technology

However, ordinary microwave irradiation is carried out in the air, and the graphene obtained by first reduction is very easy to burn and even cause fire under microwave irradiation, which brings potential safety threats to the industrial application of microwave production of graphene.

Moreover, the graphene obtained by microwave irradiation is very bulky (up to 100L / g), and its mass is easy to fly, making it difficult to collect.

These problems have become obstacles to the industrial production of graphene by microwave irradiation

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