Coupling reactor for synthesizing ethylene glycol by alkyl oxalate hydrogenation

Abstract

The invention relates to a coupling reactor for synthesizing ethylene glycol by alkyl oxalate hydrogenation. The coupling reactor comprises an upper head, a lower head and a reactor shell arranged between the upper head and the lower head, wherein the upper head is provided with a reaction gas inlet, a refrigerant outlet and a manhole; the lower head is provided with a reaction gas outlet, a refrigerant inlet and a catalyst unloading port; a first gas distributor, an adiabatic reaction section, a second gas distributor and an axial-radial reaction section are arranged in the reactor shell fromtop to bottom sequentially. Compared with the prior art, the coupling reactor is simple and compact in overall structure, good in economic practicability, safe and stable, has the advantages that reaction gas is distributed uniformly, bed temperature distribution is reasonable, selectivity of ethylene glycol is high, and production capacity of the reactor can be improved remarkably on the premisethat diameter of the reactor is not increased, and has good industrial application prospect accordingly.

Description

technical field [0001] The invention belongs to the technical field of chemical technology, and relates to a coupled reactor, in particular to a coupled reactor for hydrogenating alkyl oxalate to synthesize ethylene glycol. Background technique [0002] Ethylene glycol is an important organic chemical raw material, which can react with terephthalic acid (PTA) to produce polyethylene terephthalate (PET), that is, polyester resin, which can be used as polyester fiber and polyester Plastic raw material, which is currently the most important use of ethylene glycol. Ethylene glycol can also react with polybasic acids such as phthalic acid, maleic acid, and fumaric acid to form corresponding polymers, collectively called alkyd resins. Secondly, ethylene glycol can also be directly used as an antifreeze agent and a coolant for preparing an engine. The dinitrate of ethylene glycol can be used as an explosive, and it is also used in the production of plasticizers, paints, adhesives,...

AI Technical Summary

Problems solved by technology

In this patent, the catalyst loading factor of the reactor is high, the pressure drop is small, and the production capacity is large, but the radial reactor has a large fluid flow area and a thin catalyst bed, so there is a possibility that the fluid is not uniformly distributed along the axial direction

In addition, because the upstream DMO feed contains impurities that can damage the catalyst, there is no guard bed, and the thinner radial bed layer cannot guarantee the service life of the catalyst.

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