Tower mobile-bed reactor and its application

Abstract

The invention relates to a tower-type moving bed reactor with internal components used for solid-phase condensation reaction of granular materials and its application. By setting inclined direction deflectors on the internal component layer, the materials in the tower can be realized Partial radial mixing eliminates the radial temperature difference of materials and effectively improves the residence time distribution; at the same time, it reduces the charging pressure at the bottom of the reactor without significantly reducing the effective volume of the reactor. A series of technical measures such as partitioning on the internal member layer, changing the inclination angle and direction of the sloping guide plate, and setting a guide cone at the junction of the center of the adjacent area, etc., make the implementation effect of the present invention better, which not only ensures the solid material The axial plunger flow reduces the flow difference between the top and the bottom of the reactor, so that the material in the tower flows downwards in a spiral manner along the internal components, which is close to the ideal plug flow; the internal components are easy to manufacture , processing and installation, easy maintenance. The invention has very wide application value in improving the degree of polymerization of polymers such as polyester, polyamide and polylactic acid, and performing solid-phase polycondensation production technology.

Description

technical field [0001] The present invention relates to a tower type moving bed reactor and its application, in particular to a tower type moving bed reactor with internals used for solid phase condensation reaction of granular materials, and this type of reactor in polyester, The specific application of polyamide, polylactic acid and other types of polymers in the solid-state polycondensation process. technical background [0002] Solid-state condensation is a form of reaction between molecules and molecules. It has a very important application in increasing the molecular weight of polymers. For example, when high-molecular polymers such as polyester, polyamide, and polylactic acid need to increase their viscosity, they can melt The intermediate product obtained from the reaction in the state is made into granules, and then undergoes solid-state polycondensation. This method is especially suitable for the polycondensation reaction of a dibasic acid and a dibasic alcohol to...

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Problems solved by technology

[0006] 3. The channel in the reactor should not have dead angles, and the condensation polymer will be degraded by heat if it stays in the dead angles for a long time, which will reduce the quality;

[0009] 1. There is inevitably a gap between the edge of the stirrer of the horizontal stirred tank and the inner wall of the tank, so that there is a stagnant boundary layer at the bottom of the tank, where the material stays in the tank for a long time, and in severe cases, a dead angle occurs

[0010] 2. The horizontal kettle with stirring is easy to produce polymer dust due to shearing and extrusion, and its installation and maintenance requirements are relatively high

[0011] 3. The material at the bottom of the ordinary tower reactor has to bear the pressure of the upper part of the material, which is easy to cause material sticking, so that the production cannot be carried out normally.

[0012] 4. There is a large radial temperature gradient inside these tower reactors without internal components and internal components with ordinary vertical orientation, and the reaction residence time of materials is also very different.

In this way, the reaction conditions of the materials are inconsistent, resulting in a wide molecular weight distribution of the final product, and even causing product quality fluctuations

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