A kind of polymer hydrogenation reaction method containing olefinic unsaturated bond

Abstract

The invention discloses an olefines unsaturated bond-containing polymer hydrogenation reaction method. The method comprises the following steps: under a hydrogenation reaction condition and existence of a hydrogenation catalyst, an olefines unsaturated bond-containing polymer solution and hydrogen are contacted in a reactor, wherein the reactors are two or more loop reactors connected in series, the cycle ratio of the loop reactors can be controlled so that the material in the reactor is close to a complete mixing flow state, wherein the cycle ratio of a first reactor is 10-200, and the cycle ratio of a second reactor and other reactor is 10-100. The method can better control the reaction temperature, the catalyst activity can be kept in a long operation period, hydrogenation efficiency is increased, and ideal hydrogenation degree can reached.

Description

technical field [0001] The invention relates to a method for hydrogenation reaction of polymers containing olefinic unsaturated bonds. More specifically, two or more loop reactors connected in series are used to continuously hydrogenate polymers containing unsaturated bonds in the presence of hydrogenation catalysts and hydrogen. Background technique [0002] Polymers containing unsaturated bonds have poor thermal and oxygen stability and aging resistance, so the unsaturated bonds of polymers are often saturated by hydrogenation to increase their stability. It is generally required that the degree of unsaturation of the polymer after hydrogenation is less than 2% (that is, the degree of hydrogenation is greater than 98%) in order to achieve significant improvement in polymer properties. Polymer hydrogenation is usually carried out in the presence of metal catalysts, which can be organic compounds of Group VIIIB metals of the periodic table such as Fe, Co, Ni and / or Pb, or m...

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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