Multi-layer drop tube type falling film polycondensation reactor

Abstract

The invention relates to a multi-layer drop tube type falling film polycondensation reactor. The polycondensation reactor mainly comprises an outer tower and a plurality of tower cores arranged sequentially from top to bottom, wherein each tower core comprises a tower plate and a plurality of falling film drop tubes arranged side by side; each falling film drop tube comprises a hollow pipe and a plurality of drop sleeves fixed on the outer side wall of the hollow pipe; each drop sleeve comprises an upper separation sleeve and a lower separation sleeve. Depending on the action of gravity of materials, a very large gas-liquid phase interface is formed on the falling film drop tubes, and removal of small molecules is facilitated; when fluids pass through each pair of separation sleeves on each falling film drop tube, the fluid in an internal wall surface area and the fluid in a surface area exchange, and a good surface renewal effect is realized to increase the mass transfer rate. The reactor is simple in structure and high in surface renewal rate and has very large gas-liquid interface; the flow is large, and retention time is controllable; reaction energy consumption is low, and externally added power equipment is avoided.

Description

technical field [0001] The invention relates to a multilayer drop tube type falling film polycondensation reactor, in particular to a drop tube type polycondensation tower with a high specific interface. Background technique [0002] The characteristic of the polycondensation process is that through the reaction between the terminal functional groups, the small molecule products are gradually removed but the molecular weight of the polymer is gradually increased. For the whole reaction process, the viscosity of the system increases continuously with the progress of the reaction, with tens of milliPascal seconds and finally even reaching hundreds of thousands of milliPascal seconds. Especially in the later stage of the reaction, with the increase of viscosity and reaction degree, the removal of small molecules becomes very difficult, so mass transfer becomes the decisive factor controlling the progress of the reaction. Due to the extremely limited diffusion of small molecules...

AI Technical Summary

Problems solved by technology

Both of these are horizontal stirred reactors, which rely on the lower part of the disc or mesh immersed in the melt layer to bring the melt into a film when rotating, but due to the influence of stirring, the energy consumption is relatively large, and Due to the high vacuum required in the system, it is relatively difficult to seal the shaft

At the same time, limited by the bridge of the melt grid in the kettle, on the one hand, the disk or mesh must maintain a large distance, resulting in insufficient surface area per unit melt, and on the other hand, the disk or mesh must have a certain distance from the inner wall of the kettle. distance to ensure no mechanical accidents, but there may be a certain dead zone

All of the above severely limit the application of these two reactors

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