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Method for direct production of N-methylisopropanolamine from methylamine and propylene epoxide

A technology of methyl isopropanolamine and propylene oxide is applied in the preparation of organic compounds, the preparation of amino hydroxy compounds, chemical instruments and methods, etc., and can solve the problems of short supply of N-methyl isopropanolamine, etc., Achieve the effect of low production cost and simple operation method

Active Publication Date: 2017-10-03
MAOMING YUNLONG IND DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no efficient production process for N-methylisopropanolamine in the industry at present, so that the demand for N-methylisopropanolamine is in short supply

Method used

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  • Method for direct production of N-methylisopropanolamine from methylamine and propylene epoxide
  • Method for direct production of N-methylisopropanolamine from methylamine and propylene epoxide
  • Method for direct production of N-methylisopropanolamine from methylamine and propylene epoxide

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Embodiment 1

[0025] A kind of production technology that methylamine and propylene oxide directly generate N-methylisopropanolamine in the present embodiment, such as figure 1 shown, including the following steps:

[0026] Step 1, the methylamine solution is pumped into the reactor, and the temperature of the reactor is adjusted to 60°C and the pressure is adjusted to 0.05MP;

[0027] Wherein, the concentration of the methylamine solution is 30%;

[0028] Step 2, pressurize propylene oxide with nitrogen and then put it into the reaction kettle described in step 1 at a rate of 10ml / s, so that propylene oxide and methylamine solution are mixed and reacted, and the temperature of the reaction kettle is adjusted to 70°C and the pressure is adjusted to 0.05MP, mixed reaction obtains the crude product of N-methylisopropanolamine; Wherein, the reaction formula of monomethylamine and propylene oxide is:

[0029]

[0030] The molar ratio of the propylene oxide to the methylamine solution is 1:...

Embodiment 2

[0036] A kind of production technology that methylamine and propylene oxide directly generate N-methylisopropanolamine in the present embodiment, such as figure 1 shown, including the following steps:

[0037] Step 1, pump the methylamine solution into the reactor, and adjust the temperature of the reactor to 100°C and the pressure to 0.2MP;

[0038] Wherein, the concentration of described methylamine solution is 40%;

[0039] Step 2, pressurize propylene oxide with nitrogen and put it into the reaction kettle described in step 1 at a rate of 30ml / s, so that the propylene oxide and methylamine solution are mixed and reacted, and then adjust the temperature of the reaction kettle to 110°C and adjust the pressure Be 0.2MP, make the mixed reaction of propylene oxide and methylamine solution obtain the crude product containing N-methylisopropanolamine; Wherein, the reaction formula of monomethylamine and propylene oxide is:

[0040]

[0041] Wherein, the molar ratio of the pr...

Embodiment 3

[0047] A kind of production technology that methylamine and propylene oxide directly generate N-methylisopropanolamine in the present embodiment, such as figure 1 shown, including the following steps:

[0048] Step 1, the methylamine solution is pumped into the reactor, and the temperature of the reactor is adjusted to 70°C and the pressure is adjusted to 0.1MP;

[0049] Wherein, the concentration of the methylamine solution is 35%;

[0050] Step 2, pressurize propylene oxide with nitrogen and put it into the reaction kettle described in step 1 at a rate of 20ml / s, so that the propylene oxide and methylamine solution are mixed and reacted, and then adjust the temperature of the reaction kettle to 95°C and adjust the pressure Be 0.1MP, make the mixed reaction of propylene oxide and methylamine solution obtain the crude product containing N-methylisopropanolamine; Wherein, the reaction formula of monomethylamine and propylene oxide is:

[0051]

[0052] Wherein, the weight ra...

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Abstract

The invention relates to the technical field of petrochemical products and particularly relates to a method for direct production of N-methylisopropanolamine from methylamine and propylene epoxide. The method comprises pumping the aqueous solution of methylamine into a reactor, slowly adding propylene epoxide into the reactor, carrying out mixing for a reaction, pumping the crude product obtained by the reaction into a rectification tower, adjusting rectification parameters of the rectification tower, and carrying out reflux separation several times to orderly remove the aqueous solution of methylamine and the middle fraction and to obtain the N-methylisopropanolamine product. The method fills the gap in high-efficiency production of N-methylisopropanolamine in the industry, realizes direct batch production of N-methylisopropanolamine only through the reactor and the rectification tower and has the advantages of high production efficiency and low production cost.

Description

technical field [0001] The invention relates to the technical field of petrochemical products, in particular to a production process for directly generating N-methylisopropanolamine from methylamine and propylene oxide. Background technique [0002] N-Methylisopropanolamine, referred to as MMIPA, is a colorless transparent liquid with an ammonia smell, soluble in water, methanol, ethanol, slightly soluble in toluene, acetone, petroleum ether and other organic solvents, under normal temperature and pressure, The specific gravity of N-methylisopropanolamine is 0.896g / cm 3 , the boiling point is 146°C, the flash point is 51°C, the viscosity is 2.1 CP, and the refractive index is 1.438. In actual production, N-methylisopropanolamine is widely used in the removal of hydrogen sulfide from natural gas and oil refinery dry gas, and the removal of carbon dioxide from large-scale synthetic ammonia. It is a new type of solvent with excellent performance in selective desulfurization a...

Claims

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Application Information

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IPC IPC(8): C07C213/04C07C213/10C07C215/08
CPCC07C213/04C07C213/10C07C215/08
Inventor 梁坤
Owner MAOMING YUNLONG IND DEV
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