Method for continuously synthesizing ethanol amine and derivative thereof through micro-tube reaction-rectification coupling

Abstract

The invention discloses a method for continuously synthesizing ethanol amine and a derivative thereof through micro-tube reaction-rectification coupling. The method comprises the following steps: mixing amine and water/circulating water to form an amine aqueous solution, and introducing the amine aqueous solution and ethylene oxide which serve as materials into a micro-tube reactor; keeping the pressure in the micro-tube reactor to be 1.5 MPa or higher, performing homogenous phase liquid phase reaction on the amine aqueous solution and the ethylene oxide in the micro-tube reactor in the form of liquid, and discharging an ethanol amine mixture from the micro-tube reactor; cooling the ethanol amine mixture by a condenser and entering a reduced-pressure rectification tower to perform reduced-pressure rectification or entering a flash tower to perform flashing, wherein the bottom distillate of the reduced-pressure rectification tower/ flash tower is the ethanol amine material, namely the ethanol amine or the derivative thereof. The method is high in atom economy, high in product reaction selectivity, high in raw material conversion rate, mild in reaction condition and short in reactiontime, and water serving as a catalyst can be recycled.

Description

technical field [0001] The invention relates to a microtube reaction-rectification coupled continuous synthesis process of ethanolamine and its derivatives. Background technique [0002] Ethanolamine and its derivatives include monoethanolamine (MEA), diethanolamine (DEA), triethanolamine (TEA), N-methylmonoethanolamine (MMEA), N-methyldiethanolamine (MDEA), N,N-dimethyl Ethanolamine (DMAE) and dimethylaminoethoxyethanol (DMAEE) are important organic chemical raw materials widely used in surfactants, gas purifiers, pharmaceuticals, textiles, synthetic resins and rubber processing. [0003] At present, the industrial production method of ethanolamine and its derivatives adopts oxirane ammonolysis method. When amines (ammonia) and oxirane (EO) react, the active hydrogen atoms on the ammonia molecule will be hydroxyethyl ( -CH2CH2OH) are replaced and successively generate ethanolamines, and ethanolamines and EO continue to react to synthesize diethanolamine, triethanolamine or...

AI Technical Summary

Problems solved by technology

In order to reduce side reactions, a large excess of EO or amines is often used, resulting in waste of materials

According to the patent (CN101648880), if you want to recycle ethylene oxide and amine low boilers, you need to remove low boilers, flash evaporation, etc., which consumes a lot of energy and the equipment is relatively complicated.

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