Micro-interface reaction system and method for preparing ethylene glycol by gas-phase catalytic hydration method

Abstract

The invention provides a micro-interface reaction system for preparing ethylene glycol by a gas-phase catalytic hydration method. The micro-interface reaction system comprises a first hydration reaction rectifier, a second hydration reaction rectifier and a first evaporation tower, the first hydration reaction rectifier is connected with the second hydration reaction rectifier in parallel; an agent adding pipeline and an ethylene oxide inlet are sequentially arranged on the side walls of the first hydration reaction rectifier and the second hydration reaction rectifier from top to bottom; a hydraulic micro-interface generator is arranged in the first hydration reaction rectifier; the hydraulic micro-interface generator is connected with an ethylene oxide inlet in the side wall of the firsthydration reaction rectifier so as to disperse and crush the ethylene oxide entering the hydraulic micro-interface generator. The micro-interface reaction system is low in equipment energy consumption, low in cost, high in safety, controllable in reaction and high in raw material conversion rate, equivalently, a reaction system with higher operability is provided for the field of ethylene glycolpreparation, and the micro-interface reaction system is worthy of wide application and popularization.

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 gas-phase catalytic hydration. Background technique [0002] Ethylene glycol is an important aliphatic dihydric alcohol with a wide range of uses, mainly for the production of polyester resins, including fibers, films and engineering plastics. It can also be directly used as coolant and antifreeze, and it is also an indispensable substance in the production of alkyd resins, plasticizers, paints, adhesives, surfactants, explosives and capacitor electrolytes. [0003] The preparation of ethylene glycol with ethylene oxide as raw material is mainly divided into two methods, one is the direct hydration method, that is, ethylene oxide directly reacts with water under certain conditions to form ethylene glycol, and the reaction can be achieved without a catalyst. It is divided into two methods: cat...

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Problems solved by technology

However, the acidity of the niobic acid catalyst is too strong, more than 50% of which is H0:-5.6 or less, so it is not suitable for the catalytic hydration of ethylene oxide to prepare ethylene glycol.

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