Hydrogenation method for improving yield of bisphenol-A type hydrogenated epoxy resin

Abstract

The invention discloses a hydrogenation method for improving the yield of a bisphenol-A type hydrogenated epoxy resin. The method comprises a step of uniformly dispersing hydrogen which is input into a hydrogenation reaction tank by using a guidance gas stirrer with aspiration, exhaust and stirring functions in the hydrogenation reaction tank through the aspiration, exhaust and stirring of the guidance gas stirrer. The method ensures that reaction fluid contains high-concentration dissolved hydrogen, so that a hydrogenation catalyst has extremely high activity and the rate of a hydrogenation reaction is accelerated; and the method can ensure that the hydrogenation reaction is performed at low temperature and under low pressure, even increase the yield of the bisphenol-A type hydrogenated epoxy resin to be between 99.0 and 99.9 percent, greatly reduce the construction and maintenance cost of the hydrogenation reaction tank, and improve economic benefit.

Description

technical field [0001] The invention relates to a method for preparing propanediol-type hydrogenated epoxy resin, in particular to a hydrogenation method for increasing the yield of propanediol-type hydrogenated epoxy resin at low temperature and low pressure. Background technique [0002] Propylene glycol type epoxy resin is the most widely used epoxy resin. Propylene glycol type hydrogenated epoxy resin after hydrogenation reaction does not contain double bonds, is not easy to produce yellowing phenomenon, has low viscosity, processability and weather resistance Excellent and other characteristics. [0003] Such as figure 1 As shown, the traditional hydrogenation reaction tank 10 for hydrogenating propanediol type epoxy resin is attached with an impeller stirring device 20, and the blade 22 that is located at the end of the rotating shaft 21 is driven by the rotating shaft 21 of the impeller stirring device 20 to rotate and stir the propanediol Type epoxy resin solution ...

AI Technical Summary

Problems solved by technology

[0006] 1. The amount of hydrogen used is high, with a pressure of 30MPa, which is equivalent to 4351 pounds per square hour;

[0007] 2. In order to increase the hydrogenation reaction rate, the reaction temperature is as high as 150°C, but the epoxy group is easy to decompose at high temperature;

[0008] 3. Special equipment must be used to operate under high pressure and high temperature

[0009] Another U.S. published patent application US006060611A discloses that aromatic-based epoxy compounds are hydrogenated at a reaction temperature of 30-150° C. and a reaction pressure of 1-30 MPa. Like the aforementioned U.S. published patent application US006130344A, it needs to be operated under high pressure and high temperature, and there are also production Disadvantages of lower rates

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