Fixed bed reactor is a continuous chemical reactor suitable
for gas-liquid solid three-phase reaction, which is widely used in
the catalytic cracking reaction of petrochemical industry. The
fixed bed reactor carries out concentrated loading of the catalyst,
and the catalyst is in an over proportioning state during the
reaction. In addition, the vapor liquid volume ratio is adjusted
through back pressure, and the mixing state is optimized through
the vapor liquid distributor to strengthen the reaction
environment, shorten the reaction time, and achieve continuous high
flux production.
The basic components of fixed bed reactor include: gas metering
system, liquid metering system, liquid preheater, gas-liquid
distributor, hydrogen cooling pipe, gas-liquid cooler, gas-liquid
separator, etc. Among them, gas-liquid distributor is the most
important core component, which determines the effect of uniform
gas-liquid mixing. If the gas-liquid mixture is uneven and the
local proportion is unbalanced, the complete reaction of materials
can never be realized in the continuous and non backmixing reaction
process. At present, there are many kinds of gas-liquid
distributors that have been developed, such as CZ type distributor,
BL type distributor, Union Oil distributor, nozzle type
distributor, etc.
At present, fixed bed reactors are widely used in petrochemical
industry, and most of them are catalyst evaluation devices in fine
chemical industry. The volume of catalyst evaluation device is
small (*0~**0mL), which is mainly used for theoretical research of
catalyst performance. With the development of continuous flow
technology, the fixed bed reactor has also occupied a certain
position in the field of fine chemical industry, which can realize
pilot and pilot production. It can be used not only in catalytic
hydrogenation reaction, but also in gas-liquid reactions such as
oxidation and ammoniation.
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