Tubular type annular channel double-sided heat-exchange large-flux microchannel fixed bed reactor

Abstract

The invention discloses a tubular type annular channel double-sided heat-exchange large-flux microchannel fixed bed reactor. The reactor is sleeved in a tube (2) through a catalyst pipe (3), a middle sleeve (4) is sleeved in the catalyst pipe (3), a double-annular clearance microchannel is formed between the catalyst pipe (3) and the tube (2) and another double-annular clearance microchannel is formed between the catalyst pipe (3) and the middle sleeve (4), the space of the annular clearances is 0.05-5mm, and 0.2-2mm is the best. The reactor has all the advantages of a microreactor and a filling bed reactor, the defect that pressure drop is generated to damage normal operation when the fluid of a filling bed flows in a bed layer and the difficulty that the flux of the microreactor is universally small can be solved, more than 98% of catalysts can be saved by replacing a hydrogenated reaction kettle with the reactor, the temperature of the bed layers of the reactor is even, and the defect that the fixed bed reactor easily generates temperature runaway can be overcome.

Description

technical field [0001] The invention relates to a microreactor, in particular to a microchannel fixed-bed reactor with double-sided heat exchange and large flux of tube-and-tube annular channels. Background technique [0002] In chemical production, traditional fixed bed reactors are also called packed bed reactors, which are filled with solid catalysts (granular, mesh, honeycomb, fibrous, etc.) or solid reactants to achieve a heterogeneous reaction process. device. The bed is stationary and the fluid passes through the bed to react. Compared with other traditional reactors, fixed-bed reactors have their own advantages and disadvantages. The advantages are: (1) Small back-mixing, effective contact between the fluid and the catalyst, and higher selection when the reaction is accompanied by series side reactions. (2) The mechanical loss of the catalyst is small and the service time is long; (3) The structure is simple; (4) It is suitable for high temperature and high pressur...

AI Technical Summary

Problems solved by technology

Disadvantages are: (1) poor heat transfer, when the heat of reaction is large, even the shell-and-tube reactor may have a runaway temperature (reaction temperature is out of control, rises sharply, exceeding the allowable range); (2) catalyst regeneration and It is inconvenient to replace; (3) The particles of the catalyst cannot be too fine, otherwise the fluid resistance will be large and the normal operation will be destroyed, so the active inner surface of the catalyst cannot be fully utilized

At present, for this type of reaction, the simplest microreactor is to make a microchannel first, and then use various methods such as impregnation and sintering to fix the catalyst on the wall of the microchannel. The manufacturing process is cumbersome and complicated, and catalyst replacement and regeneration are difficult. ; The Massachusetts Institute of Technology has developed a micro-packed bed reactor, in which microchannels are filled with catalyst solid particles, and its structure is similar to that of a fixed-bed reactor. This reactor solves the problems of heat transfer and mass transfer in traditional reactors. It also has the advantages of high selectivity and low catalyst loss in fixed bed reactors, but the problems of catalyst replacement, regeneration and fluid pressure drop still exist

In addition, like other types of microreactors, there is a fatal shortcoming, that is, it is impossible to achieve large throughput.

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