Equipment and process for producing graphene by spray drying and microwaves

Abstract

The invention relates to equipment and process for producing graphene by spray drying and microwaves. The equipment comprises a microwave oven cavity, a spray drying device, a cyclone collector, an air shutoff unloader and an air exhaust pipe, wherein the spray drying device is arranged in the microwave oven cavity and comprises an atomizer and a drying chamber; the atomizer is arranged at the upper part of the drying chamber; the cyclone collector is connected with the drying chamber through a connection pipe; the air shutoff unloader is arranged at the bottom of the cyclone collector; the air exhaust pipe is arranged at the top of the cyclone collector; graphite is hydrolyzed under the action of strong acid and a strong oxidant such as H2SO4, HNO3 and HClO4 or under the action of electrochemical peroxidation effect to prepare an oxidized graphite aqueous solution with the concentration of 0.1-50 percent; the oxidized graphite aqueous solution raw material enters the drying chamber through a peristaltic pump and the atomizer; atomized materials are dissociated through the microwaves and are reduced into flocculent graphene easy to fly; the reduced graphene enters the cyclone collection device along with the flowing air to be collected, and the materials are packaged into a packaging bag through the air shutoff unloader.

Description

technical field [0001] The invention relates to the technical field of graphene new material preparation, in particular to a device and process for industrially producing graphene by spray drying and microwave radiation. Background technique [0002] Graphene is a layer of carbon atoms with a thickness of one atom, and carbon atoms are separated by sp 2 The thickness of hybridized carbon atoms is only a single layer of two-dimensional crystals arranged in a hexagonal plane of atoms in a honeycomb crystal lattice. 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 3000m 2 / g. Such a high specific surface area makes graphe...

AI Technical Summary

Problems solved by technology

However, the material added by ordinary microwave irradiation heating must be powder, and the process of drying graphite oxide is cumbersome and consumes a lot of energy.

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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