The distillation problem of glycidyl methacrylate, polymerization! ! ! !
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Glycidyl methacrylate presents the following problems during production: it is difficult to distill a product with 99% purity, and it tends to polymerize at high distillation temperatures. Polymerization at 90°C under reduced pressure with the inhibitor hydroquinone added
It is possible to consider using other special distillation methods to obtain the target product and then separate it. If you need help, I might be able to assist you
I have also been conducting distillation experiments involving GMA and ECH recently; first, the pressure needs to be reduced to 45 mmHg gauge pressure, and then the temperature in the reactor is increased gradually to distill out ECH (with a BP of 117°C). As the ECH content in the reactor decreases, the reactor temperature must increase in order to remove all the ECH. However, as the temperature continues to rise, even in the presence of polymerization inhibitors, a small amount of GMA will polymerize; in particular, white flocculent polymers can be observed once the temperature in the reactor drops to room temperature. Therefore, the vacuum needs to be reduced to a minimum in order to lower the evaporation temperature at the bottom of the reactor, thereby preventing excessive GMA polymerization. However, due to technical limitations of my equipment, the negative pressure can only be reduced to around 45 mmHg. I really don’t know what else to do
45 mm is equivalent to 6 KPa; it is recommended to replace the vacuum pump or improve the airtightness of the device.
What is the temperature at the bottom of the distillation column for the poster?
Try using other heat-resistant inhibitors such as PTZ or copper salts, but this might affect the color; it’s worth giving it a try