Method for preparing glycol from oxalate

Abstract

The invention relates to a method for preparing glycol from oxalate, which mainly solves the problems of easy catalyst deactivation and low selectivity of glycol serving as a target product caused by large temperature difference in a reactor in the prior art. The technical scheme of the invention is that: oxalate and hydrogen are used as raw materials, a molar ratio of the hydrogen to the oxalateis 40-200:1, fatty alcohol having 1 to 4 carbon atoms is used as a solvent, the weight ratio of the solvent to the oxalate in the raw materials is 0-0.9:1, and at least one of the oxalate, hydrogen, solvent and water is used as a cooling medium; and the cooling medium passes through a tube nest in a shell and tube fixed bed reactor at the temperature of 160 and 280 DEG C, under the pressure of between 1.0 and 6.0 MPa and under the conditions that the weight space velocity is between 0.1 and 10 hours<-1> on the basis of the weight of a mixture of the oxalate and the solvent and the molar ratioof the hydrogen to the oxalate is 40-200:1, a catalyst bed is positioned outside the tube nest, and after entering the reactor, the mixture of the raw materials and the solvent contacts a copper-containing catalyst outside the tube nest for reacting to form the glycol, wherein the flow direction of the cooling medium is the same or opposite to that of the mixture of the raw materials and the solvent, and the oxalate accounts for more than or equal to 10 weight percent of the mixture. By adopting the technical scheme, the problems are solved better. The method can be used for the industrial production of the glycol.

Description

technical field [0001] The present invention relates to a kind of method of producing ethylene glycol by oxalic acid ester, more specifically, relate to a kind of dimethyl oxalate or diethyl oxalate hydrogenation in the shell-and-tube fixed-bed reactor of internal shell-and-tube heat exchange Process for producing ethylene glycol. Background technique [0002] Ethylene glycol (EG) is an important basic organic raw material in petrochemical industry. It can be mixed with water in any proportion, and has a high boiling point and a low freezing point. Mainly used in the production of polyester fibers, antifreeze, unsaturated polyester resins, lubricants, plasticizers, non-ionic surfactants and explosives, etc., in addition to coatings, photographic developers, brake fluids and inks and other industries, It is used as a solvent and medium for ammonium perborate, used in the production of special solvents such as glycol ether, etc., and has a wide range of uses. [0003] At pre...

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is that there is a large temperature difference in the reactor in the prior art, which easily causes the problems of catalyst overheating, deactivation and low selectivity of the target product ethylene glycol. The method of ethylene glycol, which has the characteristics of small temperature difference in the radial direction of the reactor, high oxalate conversion rate, and good selectivity of the target product ethylene glycol.

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