Multiphase reactor used in ethylene carbonate synthesis

Abstract

The invention relates to a gas-liquid-solid three-phase reactor used for synthesizing ethylene carbonate with ethylene oxide and carbon dioxide. The reactor comprises, from bottom to top, a liquid discharge port, liquid baffles; a gas inlet port, a gas inlet distributor, a catalyst lower supporting sieve plate, a lower ceramic ball layer, a catalyst layer, an upper ceramic ball layer, a catalyst upper supporting sieve plate, a liquid inlet port, a liquid feed distributor, and a gas discharge port. Gas and liquid feeds respectively radially and uniformly enter the catalyst bed layer through the gas distributor and the liquid distributor. The catalyst bed layer is fixed in the reactor with the upper and lower ceramic balls and the upper and lower supporting sieve plates. The plurality sets of baffles are arranged in the lower part of the reactor. Overflow weirs are arranged on the two sides. With prior arts, gas and liquid phase feeds are not uniformly distributed, which does not facilitate sufficient reaction; and liquid products contain gas entrainments. With the reactor provided by the invention, the above problems can be solved. The multiphase reactor can be used in industrial productions for producing ethylene carbonate with ethylene oxide and carbon dioxide.

Description

technical field [0001] The invention relates to a gas-liquid-solid three-phase reactor for the synthesis of ethylene carbonate, more specifically a gas-liquid-solid three-phase reactor for the synthesis process of ethylene carbonate catalyzed by ethylene oxide and carbon dioxide reactor. Background technique [0002] Ethylene carbonate (EC) is an excellent polar high boiling point solvent and an important raw material for organic synthesis. In the second half of the 20th century, researchers from various countries carried out numerous studies on the synthesis of carbonates, and many new synthesis methods and new catalysts were discovered. The traditional production method of EC is the phosgene method, but it has the disadvantages of long process flow, low yield, high cost, etc., and phosgene is highly toxic and pollutes seriously, and its use has basically been stopped in developed countries. with CO 2 Direct esterification with EO as raw materials to prepare ethylene car...

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Problems solved by technology

[0005] What the present invention intends to solve is the following problems existing in the prior art: (1) The uneven distribution of gas and liquid phase feeds leads to short circuit and channeling phenomenon in the reactor, which reduces the utilization efficiency of the catalyst and is unfavorable to the reaction process (2) there is gas phase entrainment in the liquid product, after flowing out of the reactor, it is easy to cause damage to the downstream equipment, such as cavitation of the pump, etc., the present invention proposes a new gas-liquid-solid method for ethylene carbonate synthesis Three-phase reactor, when used in the synthesis of ethylene carbonate, the reactor has the advantages of high catalyst utilization rate, uniform distribution of gas and liquid phase feeds, and is suitable for large-scale industrial applications.

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