Method for hydrogenating polymer

Abstract

The invention relates to a method for hydrogenating a polymer containing an olefin unsaturated bond. The method comprises: hydrogenation is carried out under the condition that a solution of the polymer containing the olefin unsaturated bond is in contact with hydrogen in the presence of a hydrogenation catalyst, wherein a used hydrogenation reactor comprises two or more than two serially-connected reactors; a first reactor is divided into an upper section and a lower section; the upper section is provided with a filling section and the lower section is an empty tower section; the polymer solution flows through spray headers arranged at the top of the reactors and passes through the filling section by spraying downwards in a hydrogenation process; and then the polymer solution flows into the empty tower section; and reaction effluent of the first reactor is divided into two parts, wherein one part of the reaction effluent enters into a second reactor and the other part of the reactioneffluent is recycled into the first reactor after being subjected to heat exchange in a heat exchanger. According to the method disclosed by the invention, the contact area of the polymer solution and the hydrogen can be enlarged so that the polymer solution and hydrogen are in sufficient contact, thereby improving the hydrogenation efficiency. Furthermore, the temperature in the hydrogenation process further can be stably controlled and the catalyst deactivation caused by excessively-high temperature can be avoided, therefore, a product with ideal hydrogenation degree can be obtained within a longer operation period, and simultaneously the material consumption, the energy consumption and the operation cost in the hydrogenation process can be reduced.

Description

technical field [0001] The invention relates to a method for hydrogenation of polymers containing olefinic unsaturated bonds, the method comprising making the solution of polymers containing olefinic unsaturated bonds contact with hydrogen for hydrogenation in the presence of a hydrogenation catalyst. Background technique [0002] In order to improve the heat resistance, oxygen stability and aging resistance of polymers containing olefinic unsaturated bonds, hydrogenation is usually used to saturate the olefinic unsaturated bonds of the polymers. It is generally required that the degree of unsaturation of the polymer after hydrogenation is less than 2% (ie, the degree of hydrogenation is greater than 98%) to achieve significant performance improvements. [0003] U.S. Patent No. 6,815,509B2 discloses a polymer hydrogenation method, which includes contacting a polymer containing olefinic unsaturated groups with hydrogen in the presence of a hydrogenation catalyst to make the o...

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Problems solved by technology

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

[0007] In the prior art, U.S. Patents US 4,501,875, US 4,673,714 and British Patent GB 2,159,819A all use stirred tanks for intermittent hydrogenation. Due to the high concentration of double bonds in the reaction solution in the early stage of the reaction and the fast hydrogenation rate, the heat release is large, making the reaction The temperature is difficult to control, which 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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