Hydrogenator and polymer hydrogenation method

Abstract

The invention relates to a hydrogenation reactor which is the combination of two or more bubbling reactors, wherein, a first bubbling reactor is arranged for causing the material flow state thereof to be close to totally mixed flow, and a second and the other bubbling reactors are arranged for causing the material flow states thereof to be close to laminar flow. The invention also relates to a method for utilizing the hydrogenation reactor to cause polymers with unsaturated bonds to be continuously hydrogenized. According the method, the temperature of the process of the hydrogenation can be stably controlled, the material consumption, energy consumption and operation cost of the reaction process are greatly reduced, the hydrogenation reaction efficiency is improved, the production cost is reduced, and simultaneously, products with ideal hydrogenation degree can be stably obtained within a longer operation period.

Description

technical field [0001] The invention relates to a combined hydrogenation reactor and a polymer hydrogenation method utilizing the combined hydrogenation reactor. More specifically, according to the present invention, the polymer is hydrogenated using a continuous process, wherein the hydrogenation reactor used is a combination of two or more bubbling reactors. 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 and making them have good thermal stability. sex. Polymer hydrogenation is usually carried out in the presence of metal catalysts, the catalysts used are organic compounds of Group VIIIB metals of the periodic table such as Fe, Co, Ni and / or Pb, and organoaluminum or organolithium compounds, and can also be metallocene catalysts . [0003] In the prior art, such as ...

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Problems solved by technology

The advantage of this method is that the reaction temperature can be controlled and a product with a higher degree of hydrogenation can be obtained. The disadvantage is that the method uses a stirred reactor for hydrogenation reaction, and the mechanical energy required for stirring needs to be continuously consumed during the reaction process. The polymer in the reaction process The solution must be circulated with a large circulation ratio to ensure the smooth progress of the reaction, which requires a large amount of energy to be consumed in the circulation, and the sealing of the stirring equipment makes the manufacturing cost relatively high. In addition, the hydrogenation catalyst needs to be added in multiple times, which makes The control of the reaction process becomes more complex, all of which increase the cost of the polymer hydrogenation process

Although the hydrogenation reaction rate of the inventive method is fast, its weak point one is that the consumption of hydrogenation catalyst is large and the reaction temperature is high; The heat transfer effect of the trickle bed reactor is not good. Since the hydrogenation of polymers containing unsaturated bonds is a strong exothermic reaction, in the initial stage of the reaction, when the concentration of unsaturated bonds in the polymer solution is high, the reaction exotherm is relatively large. When the reaction heat is difficult to withdraw, the reaction temperature is also difficult to control stably, and even the reaction temperature will increase significantly, and the high temperature will deactivate the hydrogenation catalyst, thereby prolonging the hydrogenation reaction cycle or reducing the hydrogenation degree of the final product. Everything is not conducive to the normal progress of the hydrogenation reaction

Although the reactor can realize continuous feeding and discharging, the reactor structure is complicated, the manufacturing cost is high, and the hydrogenation degree of the final product is low

[0006] In the prior art, U.S. Patent No. 4,501,875, U.S. Patent No. 4,673,714 and British Patent No. GB2,159,819A all use stirred tanks for intermittent hydrogenation reactions. Since the hydrogenation reaction of polymers containing unsaturated bonds is an exothermic reaction, in the early stage of the reaction due to The concentration of unsaturated bonds in the solution is high and the hydrogenation reaction rate is fast, so the heat release is also large. At this time, the reaction temperature is difficult to control stably, which will deactivate part of the catalyst and affect the hydrogenation reaction efficiency, especially the hydrogenation process used When it is a batch process, the material consumption and energy consumption are high, the control is complicated, and the reaction efficiency is low, which is not conducive to industrial scale-up

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