Regarding the distillation of N-methylpyrrolidinone
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The original composition is 92% methylpyrrolidone, 2-3% water, and 2-4% other light components. Simple vacuum distillation is used in the equipment to purify methylpyrrolidone by removing the light components and water vapor; does the product remain at the bottom of the tank?
It remains at the bottom, but cannot be recovered through simple distillation. :lol
It depends on the heating temperature and vacuum level you set to determine this; generally, if everything consists of light components, they will remain in the reactor. If the material contains other recombinant components, it comes out from the top of the tower, while the recombinant components remain in the reactor.
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In the pilot scale experiment, with a negative pressure of 85 Kpa and the temperature raised to around 155 degrees, why is there a variety of color variations, such as purple and blue?
It is likely impurities in NMP, along with other substances. Generally, NMP is colorless; even when decomposed at high temperatures, it only turns yellowish.
We have already started mass production here; each batch weighs 4.0 tons. The vacuum level is similar to yours, and NMP emerges from the top of the tower at temperatures between 140–150 degrees, with the top temperature ranging from 115–125°C. Given the various changes you mentioned, it is very likely that it is impurities; you can take an instantaneous sample at this time and analyze it.
What are the levels of NMP and water content at the tower top distillate outlet?
The water content and level are related to the height of your tower as well as the yield. With a tower height of 7 meters, it’s possible to achieve a water content of 0.01%. The degree of purification depends on the initial concentration of the waste liquid; at least 94% purity can be achieved from a starting material with 92% purity