Colorless or deep yellow oil liquid.
Freezing point is - 21 ℃, boiling point 247.2 ℃, 121 ℃ (0.53 kPa), relative density 1.0377 (20/4 ℃), the refractive index of 1.4678, flash point 260 ℃.
Can be mixed with water, alcohol, soluble in ether.
It is used mainly as emulsifier and acidic gas absorber, acid base control agent, polyurethane foam catalyst.
It is also used as an intermediate for anti-tumor drugs such as nitrogen mustard.
The production method 1. By formaldehyde and diethanolamine reaction.
Add the formic acid reaction heated a pot to boil, add formaldehyde under stirring and diethanolamine mixture, about 1 h drops out, maintained at a temperature of 90-98 ℃, continue to return 4 h.
And then to vacuum distillation, collect 120-120 ℃ (0.53 kPa) fraction, a quick N - methyl diethanolamine, yield was 85%.
Methylamine and epoxy ethane reaction.
Temperature below 30 ℃, ethylene oxide gas bubbled into 20% of methylamine solution addition reaction, through to the reaction liquid of relative density is 1.025.
Stir 15min, and the relative density is the end.
Atmospheric pressure recovery of methylamine to 103 ℃, decompression evaporate water, collected 119-170 ℃ (4.67 kPa) fractions.
Is the finished product.
Yield of 72%.
Raw material consumption quota: epoxy ethane 950kg/t, methylamine (40%) 870kg/t.
In addition, with formaldehyde and cyanide ethanol as raw materials, it is also possible to make n-methyl diethanolamine by catalyzing hydrogenation.