Preparation method of N, N-dimethylethanolamine

A technology of dimethylethanolamine and dimethylamine, applied in the N field, can solve problems such as impurities brought into the circulating liquid, and achieve the effects of reducing the unit consumption of dimethylamine, avoiding environmental pollution, and reducing production costs

Inactive Publication Date: 2010-02-17
王宇平
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Problems solved by technology

[0003] In order to overcome the above-mentioned defects, the technical problem to be solved in the present invention is to provide a new N,N-dimethylethanolamine fo

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  • Preparation method of N, N-dimethylethanolamine

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Embodiment Construction

[0016] The present invention will now be described in further detail in conjunction with the accompanying drawings and preferred embodiments. These drawings are all simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, so they only show the configurations related to the present invention.

[0017] a. Raw material mixing: ethylene oxide, dimethylamine and circulating liquid are mixed;

[0018] b. Synthesis reaction: transfer the mixed raw materials into the reactor, increase the internal pressure of the reactor to 4-8MPa, control the temperature at 130-160°C, and obtain a mixture containing N,N-dimethylethanolamine at the end of the reaction;

[0019] c. Deamination treatment: reduce the pressure of the mixture containing N,N-dimethylethanolamine to 0.8-1.2MPa through the first pressure reducing valve, and pass it into the middle of the deamination tower, and the temperature at the bottom of the deamination towe...

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Abstract

The invention relates to organic amine synthesis, in particular to a preparation method of N, N-dimethylethanolamine, which comprises the following steps: (a) raw material mixing; (b) synthetic reaction; (c) deamination treatment; (d) flash vaporization treatment; (e) absorption treatment; and (f) rectification treatment and separation of N, N-dimethylethanolamine products. The invention solves the problem that in the prior preparation method of N, N-dimethylethanolamine, the circulating liquid brings impurities. In the invention, the previous distillate of the N,N-dimethylethanolamine is used for replacing the circulating liquid adopted in the original process, thus the DMEA content in a crude product is increased to 95%-99% from 70%-80%, the moisture content in the crude product is reduced to 1%-5% from 20%-30%, the impurity content in the crude product is reduced to 0.3% from 1.5%-2%, the unit consumption of epoxy ethane is reduced to 0.51-0.54 from 0.56-0.59, and the unit consumption of dimethylamine is reduced to 0.53-0.56 from 0.58-0.60, thereby reducing the consumption of raw materials, reducing the consumption of energy sources and avoiding the environment pollution.

Description

technical field [0001] The invention relates to the synthesis of organic amines, in particular to a preparation method of N,N-dimethylethanolamine. Background technique [0002] The original N,N-dimethylethanolamine production process requires circulating fluid to produce stably. The circulating fluid is mainly soft water, DMEA is within 5%, and dimethylamine is separated by the flash tower, so it produces The DMEA content of the crude product is about 70% to 80%, and the ions in the soft water react with ethylene oxide or dimethylamine, so the impurities in the crude product are about 1.5% to 2%, and the soft water should be replenished frequently. The more, the more impurities. When the crude product enters the rectification tower for rectification, water and N, N-dimethylethanolamine are azeotropic, so the more water, the more difficult the rectification, the longer the rectification time, and the distilled NN- The purity of dimethylethanolamine is also difficult to be ...

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Application Information

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IPC IPC(8): C07C215/08C07C213/04C07C213/10
Inventor 王宇平王胜利钱春阳邵海坤苗珂
Owner 王宇平
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