Process for preparing ethanediol by hydrating ethyleneoxide

Abstract

The invention relates to a method for manufacturing glycol by epoxy ethane hydration. The method mainly solves the problems that in the prior art, heat is difficult to remove in strong heat emission, catalyzer is easy to break caused by chemical expansion swelling and thermal expansion, and resistance drops of vertical tubes are different. The method adopts the technical proposal comprising the following steps that: epoxy ethane and water are used as raw materials; nanometer carbon tube resin is used as a catalyzer; under the conditions of a reaction temperature of between 85 and 120 DEG C, areaction pressure of between 1.0 and 1.8 MPa and an airspeed of between 1 and 3 hours SUP<-1>, the raw materials in a liquid state form are contacted and reacted with the catalyzer outside the vertical tube in a uniform temperature liquid-solid phase catalysis reactor to generate glycol, wherein, the uniform temperature liquid-solid phase catalysis reactor mainly consists of a shell body (1) capable of bearing pressure, a flange (2), an end enclosure (3), an inverted U-shaped vertical tube (4), an inverted U-shaped vertical tube bearing plate (5), a U-shaped tube tilting prevention baffle (6), a ramiform distributor (7), a discal redistributor (8), a cooling or heating medium inlet (9), a cooling or heating medium outlet (10), a tube box clapboard (11), a liquid state reaction material inlet pipe (12) and a liquid state reaction material outlet pipe (13), thereby well solving the problems. The method can be used in industrial production for manufacturing the ethanol by the epoxy ethane hydration.

Description

technical field [0001] The invention relates to a method for preparing ethylene glycol through direct hydration of ethylene oxide and water. Background technique [0002] The direct hydration of ethylene oxide is the only way to produce ethylene glycol on an industrial scale today. Almost all ethylene oxide plants co-produce ethylene glycol, or convert all ethylene oxide into ethylene glycol. The biggest disadvantage of the process is high energy consumption, long evaporation and concentration process, and large investment in equipment. [0003] The process flow of the direct hydration method is as follows: the mixed gas from the oxidation system of the ethylene oxide plant contains roughly 1 to 3% (mole) of ethylene oxide, and after the carbon dioxide and a small amount of aldehyde impurities are removed by the water absorption and desorption system, the supplementary process The circulating water adjusts the water ratio to 22-28:1 (mole). The obtained ethylene oxide aque...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is that in the method for the direct catalytic hydration of ethylene oxide and water to prepare ethylene glycol in the prior art, the carbon nanotube resin catalyst will chemically swell and thermally expand during the catalyzed reaction, which will easily cause the catalyst to collapse. Broken, and the loading of catalyst in each tube is not the same, which brings about the difference in the bearing capacity of the catalyst in each tube, which leads to the loss of activity of the catalyst in the partial tube, which leads to the decrease of reaction conversion rate and selectivity. In order to solve the problems of reduced performance and shortened catalyst life, a new method for hydrating ethylene oxide to ethylene glycol is provided

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