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Filter Operation Essentials
Jun 22, 2017

Filter purpose: First, the insoluble solution in the solution to get the solution, the second is to remove the solvent (or solution) to get crystals.

Commonly used filtering method: 1, atmospheric pressure filter operation essentials: a paste, two low, three by. With the filter filter in the ordinary funnel filter, the filtrate by its own gravity through the filter paper flow, to achieve separation. The filter paper is folded into the funnel, Filter the edge of which is slightly lower than the edge of the funnel, wetting the filter paper. Carefully pour the liquid into the funnel with a glass rod, and the liquid level should be lower than the edge of the filter paper.

If the precipitate particles are small, the solution can be allowed to stand, Filter so that precipitation settling, and then carefully put the supernatant into the funnel,

Finally, the part of the precipitation into the funnel. This will speed up the filtering.

Filtration (suction filter): with a filter in the filter bottle coated with filter paper bucket funnel or glass sand core funnel filter, suction filter tube and pumping device connected to the filter under reduced pressure, the filtrate

Under the action of external pressure through the filter paper or sand core flow, Filter to achieve separation. The decompression filter includes a porcelain buzzer, a filter flask, a safety bottle and a suction pump.

Filter before the election than the Bucket funnel slightly smaller diameter of the round filter paper tile in the bottom of the funnel, wet with a solvent, open the suction device, so that the filter paper close to the bottom of the funnel. When filtering, carefully pour the mixture to be filtered into the funnel, so that the solid evenly distributed throughout the filter paper surface, has been pumping until almost no liquid filter so far. As far as possible in addition to net liquid can be

Squeeze the cake with a glass stopper. When the filter is stopped, turn the cock on the safety bottle back to normal pressure, and then close the pump. Wash the filter cake in the funnel: the filter cake as possible to dry, dry, Filter open the safety bottle on the cocks to restore often

Pressure. A small amount of solvent evenly sprinkled on the cake, so that the solvent can just cover the filter cake. Standing for a moment, so that the solvent permeates the filter cake,

To be a filtrate from the lower end of the funnel, re-pumping, Filter then try to dry the filter cake, dry. This is repeated several times

Wash the filter cake. The advantage of reduced pressure filtration is the speed of filtration and washing, the liquid and solid separation is complete, the filtered solids are easy to dry.

Hot filter

Operation essentials: a paste, two low, helpless.

Filter with a copper hot water funnel with a glass funnel. Hot water funnel between the inner and outer walls of the cavity can be filled with water, when used in the casing branch pipe heating, the sandwich in the water can heat the funnel insulation, so that the filter in the hot water insulation

Under the next. When the hot saturated solution is filtered with a conical glass funnel (the liquid may not be drained with a glass rod or the tapered glass funnel neck is in close proximity to the inner wall of the beaker), often resulting in cooling on a glass rod, funnel or its neck Precipitation of crystals, so that filtration difficult.