A kind of reaction device and method for preparing 3-hydroxypropionaldehyde by hydration of acrolein

Abstract

The invention relates to the field of chemical industry, and discloses a reaction device and method for preparing 3-hydroxypropanal by hydration of acrolein. In the device of the invention, the catalyst is packed in the tubes, and the raw materials are fed from the feed port and flow through the tubes. The catalyst is discharged from the discharge port and goes through the tube; the heat removal medium is fed from the media removal inlet of the annular channel, and discharged from the media removal outlet. The characteristics of the device of the present invention are: a feed distribution plate is set at the feed inlet, the tubes are axially inner finned tubes, and catalysts are filled in the tubes; the inlet and outlet of the shell side are equipped with annular channels, and the shell side cylinders in the annular channels are There are evenly distributed media removal through holes on the wall; the shell side adopts a disc-ring guide plate, and the center and edge of the tube sheet are respectively provided with non-pipe distribution areas. The device with the structure of the invention can realize uniform material flow and uniform heat exchange, so that the reaction temperature can be controlled within a reasonable small range.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a reaction device and method for preparing 3-hydroxypropanal by hydration of acrolein. Background technique [0002] PTT is known as an "intelligent" polymer and is widely used in the fields of textiles, carpets and engineering plastics. The fibers made of PTT have better performance and wider applications than polyester and nylon fibers. One of the main raw materials for the synthesis of new polyester PTT is 1,3 propanediol, and the hydration of acrolein to 3-hydroxypropionaldehyde and further hydrogenation to 1,3 propanediol is one of the main production processes at present. [0003] At present, domestic research on the hydration of acrolein to 1,3-propanediol focuses more on the selection of catalysts, and less research on the production equipment involved in the process. In the prior art, the tubular fixed-bed reactor is suitable for the hydration reaction of acrolein to 1,...

AI Technical Summary

Problems solved by technology

However, the main problem of the tube-and-tube fixed-bed reactor commonly used in industry at present is: after the material enters the reactor, it reacts under the action of the catalyst in the tube at a certain temperature and pressure, and part of the heat generated by the reaction is produced by the reaction. The material is taken away, and most of the heat needs to be taken away by the heat removal medium on the shell side of the reactor. Due to the uneven distribution of the reaction material in the reactor tubes, the uneven heat transfer between the tubes and the heat removal medium, etc., resulting in The difference in reaction temperature is large, which seriously affects the treatment effect and reaction efficiency of the reactor; for exothermic reactions, especially when the heat release is large, it is easy to cause the local temperature of the catalyst bed to be high, and even the phenomenon of overheating occurs, which seriously affects the service life of the catalyst and reaction efficiency

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