advantage
(1) The flow of the fluid can be regarded as an ideal displacement flow, so the chemical reaction rate is faster, and the required catalyst dosage and reactor volume are smaller when the same production capacity is achieved.
(2) The residence time of the gas can be strictly controlled, and the temperature distribution can be adjusted, which is beneficial to improve the conversion rate and selectivity of the chemical reaction.
(3) The catalyst is not easy to wear and can be used continuously for a long time.
(4) Suitable for operation under high temperature and high pressure conditions.
shortcoming
(1) Poor thermal conductivity and complex temperature distribution.
(2) The fine particle catalyst cannot be used, and the active inner surface of the catalyst cannot be fully utilized.
(3) The regeneration and replacement of the catalyst are inconvenient.
Advantages and disadvantages of tubular fixed bed reactoradvantage:
1. The back mixing is small, the fluid and the catalyst can be effectively contacted, and high selectivity can be obtained when the reaction is accompanied by series side reactions.
2. The mechanical loss of catalyst is small.
3. Simple structure.
shortcoming:
1. When the heat transfer is poor and the reaction heat is very large, even the shell and tube reactor may have a flying temperature (the reaction temperature is out of control, rises sharply, and exceeds the allowable range).
2. The catalyst cannot be replaced during the operation, and the reaction that requires frequent regeneration of the catalyst is generally not suitable for use, and is often replaced by a fluidized bed reactor or a moving bed reactor. The catalyst in the fixed bed reactor is not limited to the granular form, and the reticulated catalyst has long been used in industry. At present, honeycomb and fibrous catalysts have also been widely used.
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