Micro-interface reaction system and method for preparing ethylene glycol by oxalate method

Abstract

The invention discloses a micro-interface reaction system for preparing ethylene glycol by an oxalate method. The micro-interface reaction system comprises a first reaction tank, an upper micro-interface generator, a lower micro-interface generator, a first shunting type micro-interface generator and a hydrogenation reaction tank, a nitric oxide gas inlet pipeline and an oxygen gas inlet pipelineare arranged on the side wall of the first reaction tank, the oxygen gas inlet pipeline is connected with a first shunting type micro-interface generator and an upper micro-interface generator, the nitric oxide gas inlet pipeline is connected with a lower micro-interface generator, and the first reaction tank is connected with a methanol storage tank; a product obtained after the reaction in the first reaction tank enters a fixed bed reactor for a coupling reaction, a product obtained after the reaction in the fixed bed reactor sequentially passes through a cooler, a gas-liquid separation tankand a regeneration tower to enter a hydrogenation reaction tank for hydrogenation catalysis, and a product obtained after the hydrogenation catalysis reaction in the hydrogenation reaction tank sequentially passes through a high-pressure separator, a low-pressure flash tank and a rectifying tower; and ethylene glycol is obtained in the rectifying tower through rectifying. According to the micro-interface reaction system, the pressure and the temperature during reaction are reduced.

Description

technical field [0001] The invention relates to the field of ethylene glycol preparation, in particular to a micro-interface reaction system and method for preparing ethylene glycol by an oxalate ester method. Background technique [0002] Ethylene glycol (Ethylene Glycol), also known as glycol, is an important petrochemical organic raw material. The chemical reaction of ethylene glycol is similar to that of monohydric alcohol, and it can carry out many typical reactions of alcohols, such as esterification reaction, dehydration reaction, etherification reaction, etc. The reaction products are mainly used in the production of polyester fibers and polyester plastics, etc., and are widely used It is used in the production of lubricants, plasticizers, non-ionic surfactants and explosives, etc., and can be directly used as antifreeze and coolant for engines. At present, there are three kinds of process routes for preparing ethylene glycol. The first is the direct synthesis proce...

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Problems solved by technology

[0005] The first purpose of the present invention is to provide a reaction system for preparing ethylene glycol by the oxalate ester method. On the one hand, the reaction system is provided with a hydraulic micro-interface generator inside the first reaction tank. The micro-interface generator breaks and disperses nitric oxide, oxygen and methanol into microbubbles, increases the mass transfer area of ​​the phase boundary between nitric oxide, oxygen and methanol, thereby solving the problem of nitric oxide, oxygen and methanol in the prior art. Methanol cannot be fully mixed in the first reaction tank, resulting in high reaction pressure, high reaction temperature and low liquid hourly space velocity, which improves the reaction efficiency. The incoming hydrogen is broken and dispersed into micro-bubbles, and dispersed into solvents and catalysts to form a micro-interface system, which increases the gas-liquid phase interface area in the reaction gas-liquid, and greatly increases the mass transfer rate from the gas phase to the liquid phase

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