A kind of polymer hydrogenation reaction method containing olefinic unsaturated bond

Abstract

The invention relates to a hydrogenation reaction method of a polymer containing olefin unsaturated bonds. The method includes contacting a solution of the polymer containing the olefin unsaturated bonds with hydrogen in reactors under conditions of hydrogenation and under the existence of a hydrogenation catalyst. The reactors are at least two reactors in series connection, wherein the first reactor is a loop reactor, and the second reactor and the later reactors are tower reactors. Materials in the first reactor are in a complete mixing flow state by controlling the recycle ratio of the first reactor, wherein the recycle ratio of the first reactor is 10-200:1, and materials in the second reactor and the later reactors are in a state approaching plug flow. Steady achievement of ideal values of the polymer hydrogenation degree can be achieved by the method.

Description

technical field [0001] The invention relates to a hydrogenation reaction method for polymers containing olefinic unsaturated bonds. More specifically, the present invention relates to a method for hydrogenating a polymer solution containing olefinic unsaturated bonds by using a series combination of a loop reactor and a tower reactor in the presence of a hydrogenation catalyst and hydrogen. Background technique [0002] Polymers containing unsaturated bonds have poor thermal and oxygen stability and aging resistance. Therefore, the unsaturated bonds of polymers are often saturated by hydrogenation, thereby greatly increasing their stability. It is generally required that the degree of unsaturation of the conjugated diene-containing segment in the polymer after hydrogenation be less than 2% by weight (ie, the degree of hydrogenation is greater than 98% by weight) in order to achieve significant performance improvements. Polymer hydrogenation is usually carried out in the pre...

AI Technical Summary

Problems solved by technology

Although the inventive method has a fast hydrogenation rate, it has the following disadvantages: the amount of hydrogenation catalyst is large and the reaction temperature is high; the liquid holdup of the trickle bed reactor is small and the utilization rate of the unit volume reactor is low; The heat transfer effect of the reactor is not good. In the initial stage of the reaction, when the concentration of double bonds in the polymer solution is high and the heat of reaction is large, it is difficult to withdraw the heat of reaction. The amplitude increases, which in turn will deactivate the hydrogenation catalyst, prolong the hydrogenation cycle or reduce the degree of hydrogenation of the final product

The disadvantage of this invention is that the reactor structure is complicated, the manufacturing cost is high and the hydrogenation degree of the final product is low

[0007] US4,501,875, US4,673,714 and GB2,159,819A etc. all adopt stirred tank to carry out intermittent hydrogenation, because the double bond concentration in the reaction solution in the early stage of the reaction is high and the hydrogenation rate is fast, resulting in a large heat release, making it difficult to control the reaction temperature, so that It will deactivate part of the catalyst and affect the hydrogenation efficiency

In addition, the batch reaction is not conducive to industrial scale-up

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