Chemical products play a very important role in our life and have a great impact on our life. There are many lab glassware in a chemical laboratory, such as glass funnels, the volumetric pipet, the round bottom flask, science beakers, etc. Among them, one kind of device that with a better function of the experimental utensils in scientific research and chemical experiment is called separating funnel
, separatory funnel, separation funnel, or colloquially sep funnel.
The separatory funnel
is a spherical, cylindrical, or pear-shade glass funnel with a three-way piston and a lid, which is usually used in chemical experiments to separate two insoluble liquids. For example, when an organic solvent is used for extraction and separation from an aqueous solution, the lower phase of the two phases can be separated by the piston of the separation funnel. The design of the piston allows the convenience of the funnel. When a large amount quantity of liquid is separated, it is just needed to move the tee of the piston to flow the two liquids into the lower pipe together, without replacing it with another container. In this way, the experimental operation process is easy to control and the labor intensity is reduced. The piston is also often used for degassing which is needed to invert the separating funnel, open the piston and release the gas produced by the equilibrium of the two phases. In the meantime, a pear-shaped funnel, also known as a drip funnel, can also be installed on the reaction device, for drip-feeding liquid. There is a scale on some of the separation funnels.
The types of separating funnel
are ball type, pear type, cylinder type, etc. The most commonly used chemistry glass funnels are spherical separation funnel, pear-shaped separation funnel, and pear-shaped graduated separation funnel. The neck of the ball-type liquid separation funnel is longer, and it is mostly used for dripping liquid in the gas-making device. The neck of the pear-type liquid separation funnel is shorter, and it is often used for extraction operations. There is a piston cover on the top and a cock on the lower neck.Spherical Separation Funnel
Use of Separating Funnel
There are two main functions of using a separatory funnel
. One is as a reaction generator for mixing solid and liquid or just different kinds of liquid. In this way, the number of substances and the reaction rate can be better controlled in the experiments. Another is used for material separation and purification that can be formed after the extraction of insoluble two liquids for liquid separation.