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Continuous preparation method for synchronously producing N-methyl monoethanolamine and N-methyldiethanolamine

A technology of methyldiethanolamine and methylmonoethanolamine, which is applied in the preparation of aminohydroxyl compounds, chemical instruments and methods, and the preparation of organic compounds, and can solve the problem that the rectification tower cannot work continuously and stably, and the stability of product quality is difficult to control and guarantees, unfavorable popularization and promotion, etc.

Active Publication Date: 2014-02-12
MAOMING YUNLONG IND DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since vacuum distillation is carried out one kettle at a time, the operators need to constantly adjust the operating parameters, so that the rectification tower cannot work continuously and stably, so that the products of methyl monoethanolamine and methyldiethanolamine cannot be continuously produced
This intermittent production method has high material consumption and energy consumption in the whole production process, and it is difficult to control and guarantee the stability of product quality, which affects the improvement of production capacity, and the labor intensity of operators is also relatively high, which is not conducive to large-scale production. Popularize and Promote

Method used

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  • Continuous preparation method for synchronously producing N-methyl monoethanolamine and N-methyldiethanolamine
  • Continuous preparation method for synchronously producing N-methyl monoethanolamine and N-methyldiethanolamine
  • Continuous preparation method for synchronously producing N-methyl monoethanolamine and N-methyldiethanolamine

Examples

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specific Embodiment 1

[0040] A specific embodiment one of a continuous preparation method for simultaneously producing methyl monoethanolamine and methyldiethanolamine of the present invention, such as figure 2 shown, including the following steps:

[0041] In step 1, the raw material ethylene oxide 2 and the raw material methylamine 1 are pumped into the mixer 4 through the first metering pump 31 and the second metering pump 32 respectively with a component ratio of 1:1.15 to 1.19. The materials are mixed, and the mixed materials enter the reactor 5, and the pressure in the reactor 5 is 3Mpa to 4.5Mpa, and the temperature is controlled at 120°C to 135°C to react for 3min to 4min to generate a mixture containing monomethylamine, A mixture of methyl monoethanolamine and methyldiethanolamine. The two raw materials are pre-mixed before the reaction, which is conducive to improving the yield of the final product, and its conversion rate and selectivity are high.

[0042] Step 2, send the mixture con...

specific Embodiment 2

[0061] A specific example 2 of the continuous preparation method for simultaneous production of methyl monoethanolamine and methyldiethanolamine of the present invention, the main technical scheme of this example is the same as that of example 1, and the unexplained features in this example are adopted The explanation in Embodiment 1 will not be repeated here. The difference between this embodiment and Embodiment 1 is:

[0062] The component ratio of the amount of raw material ethylene oxide 2 and the raw material monomethylamine 1 is 1:1.19-1.55; preferably 1:1.4.

[0063] The pressure in the reactor 5 is 4.5Mpa-5.5Mpa, and the temperature in the reactor 5 is controlled at 95°C-105°C. Generally, the pressure in the reactor 5 can be selected as 5 Mpa or 5.5Mpa according to the production requirements; the temperature is controlled at 95 °C or 100 °C.

[0064] The temperature of the bottom of the light-end distillation tower 7 can be selected from 160°C to 170°C, and generall...

specific Embodiment 3

[0068] A specific example three of a continuous preparation method for simultaneous production of methyl monoethanolamine and methyldiethanolamine according to the present invention, the main technical scheme of this example is the same as that of example one, and the unexplained features in this example are adopted The explanation in Embodiment 1 will not be repeated here. The difference between this embodiment and Embodiment 1 is:

[0069] The ratio of the raw material ethylene oxide 2 to the raw material monomethylamine 1 is 1:1.55-1.8; preferably 1:1.58.

[0070] The pressure in the reactor 5 is 4Mpa-4.8Mpa, and the temperature in the reactor 5 is controlled at 105°C-120°C. Generally, the pressure in the reactor 5 can be selected as 4Mpa or 4.8Mpa according to production requirements; the temperature is controlled at 105°C or 110°C.

[0071] The temperature of the bottom of the light component distillation tower 7 can be selected from 170°C to 175°C. Generally, the set v...

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Abstract

A continuous preparation method for simultaneous production of methyl monoethanolamine and methyldiethanolamine, comprising: pumping ethylene oxide and monomethylamine into a mixer, and the mixed material enters a reactor for reaction; the generated product containing monomethylamine, methyl The mixture of monoethanolamine and methyldiethanolamine is sent to the ammonia distillation tower for distillation, and monomethylamine is separated by distillation, and the mixture containing methylmonoethanolamine and methyldiethanolamine is separated; the mixture containing methylmonoethanolamine and methyl The mixture of diethanolamine is sent to the light component distillation tower, the methyl monoethanolamine rectification tower and the methyldiethanolamine rectification tower which are connected in series and are all fed in the middle of the tower, and are all continuously refined under negative pressure. Distillation, rectification separation of methyl monoethanolamine and methyldiethanolamine. The invention has a continuous and stable production process, can continuously produce two kinds of products, has stable product quality, low material consumption and energy consumption, and reduces labor intensity of operators at the same time, which is favorable for industrialization promotion and application.

Description

technical field [0001] The invention relates to the technical field of preparation of petrochemical products, in particular to a continuous preparation method for simultaneously producing methyl monoethanolamine and methyldiethanolamine. Background technique [0002] Methyl monoethanolamine (N-Methyl monoethanolamine), commonly known as MMEA, is a colorless or slightly yellow liquid with an ammonia odor, and is a flammable substance, and is miscible with water, ethanol, benzene, ether and acetone, etc. It is widely used in desulfurization and decarbonization in chemical fertilizer plants, synthetic ammonia plants, and oil refineries. It can also be used as intermediates in pharmaceutical production, as paint solvents, and in the manufacture of non-ionic detergents, emulsifiers, and activators. [0003] Methyldiethanolamine (N-Methyldiethanolamine), also known as N-methyldiethanolamine, commonly known as MDEA, is an excellent solvent, pharmaceutical intermediate and efficient...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C215/08C07C215/12C07C213/04C07C213/10
Inventor 梁坤
Owner MAOMING YUNLONG IND DEV