Methyl methacrylate polymerization inhibitor
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The methyl methacrylate purchased contained 0.01–0.05% inhibitor, which we removed by vacuum distillation; we observed the formation of a white solid in the collection bottle (the bottle was placed in a cold trap at around -10 degrees Celsius). Could it be the inhibitor? If that’s the case, can the inhibitor be removed directly by crystallization? I’m not sure which forum to post this in, so I’ll put it here for now{:1_90:}
It should be a polymerization inhibitor! Methyl methacrylate monomer polymerizes easily! Our company uses two different polymerization inhibitors: hydroquinone and 2,4-dimethyl-6-tert-butylphenol. The first is a solid white powder at room temperature, while the second has a melting point between 22-23°C! The one you separated out should be the second kind! Isn’t the method you use the vacuum crystallization method? I’m sorry, I’m not familiar with crystallization; I’m looking forward to others’ answers!
Since the concentration of the polymerization inhibitor is relatively low, it must be difficult to achieve this through crystallization.
Reply to 2# lch19860801: Thank you so much! So is there a good way to remove the polymerization inhibitor? We are going to use it to copolymerize with other substances. At first, my colleague suggested using vacuum distillation; I found it too troublesome, so I opted for regular distillation instead. However, it seems that the polymerization inhibitor was also vaporized along with the material……
Reply to 4# justnothing: We carry out industrial production, and we also use vacuum distillation! As for other methods, I’m not very familiar with them; I’m sorry!
Reply to 5# lch19860801: Does the inhibitor also end up in the collection bottle along with the vapor during distillation?
Reply to 6# justnothing: We can produce around 100 tons in a day! To prevent the polymerization of methacrylic acid monomer during storage and transportation! It is added only before the materials enter the finished product storage tank! Vacuum distillation is feasible, and it will also yield some methyl methacrylate!
May I ask, are the two you mentioned to be added at the same time? What is the difference between the two polymerization inhibitors?
It’s also industrial production; use vacuum distillation – give it some thought