The excellent properties of silicon carbide material (high thermal conductivity, hardness, and high strength, general corrosion resistance) make it particularly suitable for making the core components of microchannel continuous flow chemical reactor/equipment: reaction tube, reaction plate, and reaction plate module.
A microchannel reactor, also known as a microreactor, is a microreactor with a characteristic size between 10 and 300 microns (or 1000 microns) manufactured by precision machining technology. The “micro” in microreactor means that the channel of the process fluid is at the micron level, not that the micro reaction equipment has a small size. Microreactors can contain millions of microchannels, so they can also achieve high yields. The raw material of the reactor chip is submicron-level high-purity silicon carbide, which is fired at high temperature by a pressureless sintering process and precision machined. It has strong chemical corrosion resistance and excellent thermal conductivity. It can handle highly corrosive substances including hydrofluoric acid and KOH. Its high thermal conductivity determines its excellent heat exchange efficiency, greatly improving the heat transfer conditions of the reaction process and accelerating the reaction efficiency.
Microchannel reactors have a variety of geometric structures, the simplest is the tubular structure, there are also plate microchannel structures and composite structures that integrate multiple functions such as reagent injection, mixing, heat exchange, solvent exchange, phase separation, etc.
The reactor chip adopts the “reaction/heat exchange integrated” design, with one side being the reaction channel and the other side being the heat exchange channel. The two functions are integrated on a silicon carbide plate, which greatly improves the heat exchange efficiency;
The single group of reactor units is a multi-piece structure, bonded into a whole at high temperature, eliminating the risk of leakage. The chip itself has a temperature probe that can flexibly monitor the reaction temperature;
Silicon carbide ceramics have high strength, high thermal conductivity, wear resistance, and comprehensive acid and alkali corrosion resistance, and are recognized as the “dream-type” heat exchange material in chemical corrosion protection. Compared with traditional heat exchange materials such as graphite, fluoroplastics, precious metals, and glass lining, its heat exchange efficiency and service life have obvious competitive advantages, especially in some composite strong acid environments, its super corrosion resistance is irreplaceable, and it has broad application prospects in fine chemicals, pharmaceuticals, steel, light industry and other fields, and plays an increasingly important role in promoting the improvement of equipment and processes in related fields.
Strong corrosion resistance: The reaction plate material is made of pressureless sintered silicon carbide with a purity of more than 99.5% and is resistant to various chemical corrosions. It can be used in systems containing hydrofluoric acid, strong alkali, and high temperature.
High thermal conductivity: The thermal conductivity is as high as 130W/mK, which greatly improves the heat transfer conditions during the reaction and accelerates the reaction rate.
As a common material for microchannel reactors, silicon carbide has the advantages of strong corrosion resistance and poor stress resistance and is easy to break. Therefore, it is suitable for low-pressure reactions with strong corrosion and low requirements for mixing effects; it is not suitable for high-pressure reactions and reactions with high requirements for mixing effects.
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