Process for continuously producing N-monomethylethanolamine

Abstract

The invention discloses a process for continuously producing N-monomethylethanolamine, which comprises the following steps of: (1) pumping an ethylene oxide raw material and a monomethylamine raw material into a mixer or a two-stage mixer through a metering pump respectively, mixing the raw materials, and then reacting the mixed materials in a reactor to generate a mixture containing the N-monomethylethanolamine, wherein the mass ratio of the ethylene oxide raw material to the monomethylamine raw material is 1: 2-3; (2) delivering the mixture containing the N-monomethylethanolamine to an amine distillation tower, separating monomethylamine and an N-monomethylethanolamine coarse product by distillation, and conveying the distilled monomethylamine to a monomethylamine raw material container; and (3) conveying the N-monomethylethanolamine coarse product to a light component distillation tower and a reduced pressure rectifying tower in which efficient pore plate ripple fillers are filled and which are connected in series, separating an N-monomethylethanolamine product by continuous distillation, and continuously discharging the N-monomethylethanolamine product from the side or the topof the reduced pressure rectifying tower. The process is characterized in that the production process is continuous, the produced product has stable quality and high yield, and meanwhile, the processcan improve the yield and reduce the energy consumption and the material consumption, and is suitable for industrialized popularization and application.

Description

technical field [0001] The invention relates to the technical field of petrochemical industry, in particular to a process for continuous production of N-methyl monoethanolamine. Background technique [0002] N-Methylaminoethanol (2-Methylaminoethanol; N-Methylmonoethanolamine; 2-(methylamino)-Ethanol; (2-hydroxyethyl)methylamine), commonly known as MMEA, 2-(methylamino)ethanol or N-methylmonoethanolamine, is An excellent solvent, pharmaceutical intermediate and high-efficiency desulfurization and decarbonization agent, which can be widely used in desulfurization and decarbonization in chemical fertilizer plants, synthetic ammonia plants, and oil refineries. Detergents, emulsifiers and activators, etc. [0003] In the prior art, the general production of N-methyl monoethanolamine at home and abroad adopts a batch production process, such as figure 1 Shown, wherein, the process of reaction and distilling amine is continuous, but rectifying process is intermittent, owing to a...

AI Technical Summary

Problems solved by technology

Since most of the purchased catalyst is water, most of the water does not participate in the reaction during the reaction process, and the water must be distilled out in the subsequent distillation process, which further increases energy consumption, and due to the presence of water Existence, part of water and ethylene oxide generate by-product ethylene glycol, etc., resulting in relatively low selectivity and low yield of reaction

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