Usually 45 minutes of decanting is enough to get good phase separation. In the reactor there should be two separate layers; one is water and the other is the product. Since the swap out of agitators, separation is taking multiple days instead of around 45 minutes.
The working theory is that the new agitator is mixing too much/ too violently. Your thoughts on this theory? We used to have an enameled 3- blade retreat agitator in a 9 cubic meter batch reactor. Unfortunately I am unable to find any specifications on the old agitator. All I can find is pictures on Google when searching for "3 blade retreat curve agitator". The reactor still contains a single baffle which is 2,49 meters in length, of which approximately 1,7 meters is in contact with the liquid. The baffle is one piece and has the shape of a cricket bat. It is 83 mm thick and 175 mm wide. The reactor has the following specifications: - 9 cubic meter content - Spherical top and bottom Product viscosity is between 1 and 2,5 Cp at ambient temperature. Density is between 1,1 - 1,25 kg/m3. The impeller specifications: (3 blade hydrofoil) - Manufacturer: Lightnin - Model series 10: 15S-4C - 4kW power - Nominal rpm: 100 rpm - Pumping rate: 28 m3/min - Diameter impeller: 750mm Shaft length of the impeller (not sure if this is important). - 2445 mm and 50mm diameter - Distance from bottom of reactor: 850 mm