Vacuum Filtration of Large Volumes in the Laboratory

Laboratory vacuum filtration of large volumes of liquids may be safely, easily, and economically accomplished without the use of pumps and without the necessity for placing receivers under vacuum. In the method described the lowered pressure is generated by the filtrate as it falls down a vertical tube.

Freezing-Out, a Safe Technique for Concentration of Dilute Solutions

The principle of freezing-out has been adapted for the quantitative concentration of small or large volumes of dilute solutions. Mechanical stirring is an essential part of the process. The method should prove of greatest value where volatile or heat-labile substances are to be concentrated and is applicable to solutions in certain organic solvents as well as to aqueous solutions.