Selection of reactor agitator type
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I have been conducting scale-up experiments recently in a reactor using NMP (N-methylpyrrolidone) as a solvent, to synthesize a compound via the reaction of dichloromethane and hydroquinone. The reaction temperature is around 130–140°C. There is a problem: due to the high temperature inside the reactor, dichloromethane (with a boiling point of 39.5°C) vaporizes easily once it is added to the reactor, which may result in insufficient contact between dichloromethane and hydroquinone. I would like to ask experienced users: what type of stirrer can be used to increase the residence time of dichloromethane in the reaction mixture and facilitate better contact between the two reactants? Are there any design aspects of the reactor that could improve their interaction?
Is it good to use a disc turbine stirrer? Another question is: what kind of structure would be suitable for the dichloromethane feed pipe?
**Cyclization is a reflux azeotropic reaction; dichloromethane is distilled off, condensed, and returned to the system after water separation, and additional amounts need to be added later on. Suggestion: For mixing, use a combination of impeller and paddle types (based on personal understanding since I have no experience in production; for reference only!) ）
Adopt a combined propulsion + paddle type?