How to match the purification distillation of circulating water vacuum pump instrument

In the process of separation and purification, there have been many small partners who tend to choose oil pump During the operation of oil pump, oil and gas will be generated, or oil return and injection will occur, which brings some unnecessary troubles to the experiment In fact, we can choose the corresponding real empty products according to the application requirements 1 Negative pressure filtration / EXTRACTION: primary diaphragm pump Vacuum filtration or extraction does not have high requirements for vacuum degree control and ultimate vacuum degree When filtration or extraction is conducted at 100mbar, 90% of atmospheric pressure can be used as an effective driving force for negative pressure, and the normal selection of primary diaphragm pump can meet the experimental requirements; if the filtered material is hydrophilic or viscous, it is recommended to select a diaphragm pump with higher ultimate vacuum degree 2 Vacuum centrifugal concentration: first / second / third stage diaphragm pump vacuum centrifugal concentration is particularly suitable for sensitive biological samples, such as proteins, nucleic acids and other substances Therefore, the main purpose of vacuum centrifugation is to obtain high concentration samples without cross contamination, sample loss, sample denaturation, sample activity reduction or oxidation There is no water, oil or waste media in the diaphragm pump, which will not cause additional pollution to the sample 3 Rotary / parallel evaporators: two stage / three stage diaphragm pump & Vacuum Control The vacuum demand of rotary evaporators is very different based on the type of solvent and evaporation temperature, but the use of three-stage diaphragm pump is enough to meet the requirements of common solvent evaporation in the laboratory, even the DMF / DMSO high boiling point solvent can be easily evaporated out; of course, with a vacuum controller, it can be applied to almost all the experiments of rotary evaporation to obtain good evaporation efficiency, and Vacuubrand automatic detection Boiling point technology can restrain the sample from bursting, free hands and shorten the experiment time 4 Vacuum drying: the two-stage / three-stage diaphragm pump & large pumping speed vacuum drying oven is mainly used for drying very sensitive substances, especially for obtaining high-quality drying residues The drying process usually requires a better ultimate vacuum, which is determined by the requirements of dryness, acceptable working temperature and solvent used Under certain process parameters, a lot of steam will be produced, so the selected vacuum pump needs to be able to provide enough pumping speed There is no water, no oil and no waste medium in the diaphragm pump, and the oil pump is likely to return oil in use, resulting in pollution of drying oven and sample 5 Freeze vacuum drying: rotary vane pump & Chemical hybrid pump Freeze drying is a method to freeze the substances containing water or other solvents into solid in advance, and then make them sublimate directly from solid to gas in the state of vacuum to obtain drying Therefore, it has higher requirements on vacuum degree and pumping speed Generally, it will choose two-stage rotary vane pump, the unique chemical hybrid pump technology of Vacuubrand, which can reduce oil consumption by 90% compared with the single rotary vane pump Consumption, and to minimize the solvent in the pump cavity condensation now, reduce internal corrosion, extend the maintenance cycle and service life.