What is the composition of a separating funnel and how does it work?

The separating funnel is a kind of glass experimental instrument, especially involving a separating funnel for chemical experiments. Including the bucket body, the bucket lid that covers the upper mouth of the bucket body. The lower mouth of the bucket body is provided with a piston of a three-way structure, and the two crosses of the piston are connected with two downpipes respectively.

When the amount of liquid that needs to be separated is large, the two liquids in the bucket body can flow to the lower tube at the same time by moving the tee of the piston, and it can be completed at one time without changing the container. In the junior high school stage, the main function of the separating funnel is to control the rate of chemical reactions. This device is a kind of experimental vessel with good function in scientific research and chemical experiments.

The separating funnel is made of ordinary glass, and there are various styles such as spherical, conical and cylindrical, and the specifications are milliliters. The spherical funnel has a long neck and is mostly used as an instrument for adding liquid dropwise in the gas making device. Conical separating funnels have a short neck and are often used as instruments for extraction operations.

Before using the separating funnel, the core on the funnel neck should be taken out, coated with petroleum jelly, and inserted into the plug groove to rotate to make the oil film uniform and transparent, and rotate freely. Then close the, fill the funnel with water, check whether the is leaking, and the non-leaking separating funnel can be used. The amount of liquid added to the funnel should not exceed 3 4 of the volume.

To prevent impurities from falling into the funnel, the plug on the mouth of the funnel should be closed. When discharging liquid, the groove on the grinding plug and the small hole on the mouth neck of the funnel should be aligned, so that the air inside and outside the funnel is connected, and the medical strength is equal, so that the liquid in the funnel can flow out smoothly. The separating funnel should not be heated.

Wash the funnel after use. If the separating funnel has not been used for a long time, wipe the clean, and put a paper strip between the plug core and the plug groove to prevent the frost from sticking.

One more switch than a long-necked funnel.

Similar to the long-necked funnel, there is a piston in the upper part.

A separating funnel is a glassware commonly used in laboratories to separate two immiscible liquids. The principle is based on the difference in specific gravity between the two liquids and the action of gravity.

Specifically, when two immiscible liquids are mixed together, the denser liquid sinks underneath and the less dense liquid floats on top. The separating funnel is designed to take advantage of this principle to release the mixture through the lower part of the funnel, so as to achieve the purpose of separating two liquids.

The structure of the separating funnel is peculiar, with a narrow upper end, a wider lower end than the skin, and a conical collection area in the middle. During the use of the separating funnel, the mixed liquid is first poured into the funnel and then waits for a while for the two liquids to separate. After that, the lower piston or swivel tap is opened, and the denser liquid flows out along the bottom of the funnel, while the less dense liquid remains in the upper part of the funnel.

In this way, the two liquids can be collected separately.

It is important to note that the separating funnel can only be used to separate two immiscible liquids, and the relative density difference between the liquids must be large enough, otherwise the separation effect will be poor. In laboratory operations, there are also safety precautions to be taken when using a separating funnel, such as ensuring that the lower end of the funnel is placed in a receiving container to avoid spilling liquids that could cause safety concerns.

The separating funnel includes a bucket body, a bucket lid that covers the upper mouth of the bucket body. The lower mouth of the bucket body is provided with a piston of tee structure, and the two passes of the piston are connected with two downpipes respectively. When the amount of liquid to be separated is large, only the tee of the piston can flow two liquids in the bucket body to the lower tube at the same time, and it can be completed at one time without changing the container.

There are three kinds of separating funnels: spherical, pear-shaped and cylindrical, pear-shaped and cylindrical separating funnels are mostly used for separating operations, and spherical separating funnels are not only used for liquid addition, but also often used for separating slow liquid.

Principle of the separating funnel:

Two immiscible solutions are stratified together, the dense one is below, the density is lower and the lower one is higher, the lower liquid can flow out from the small mouth, and after the belt is exhausted, the upper liquid can be poured out from the upper mouth to achieve the purpose of separating.

Purpose of separating funnel:

Solid-liquid or liquid-to-liquid reaction generator: control the amount of liquid added and the size of the reaction rate.

Substance separation and purification: separating the two immiscible liquids formed after extraction.

The first degassing is during extraction, the funnel is inverted and oscillated, the extractant volatilizes, and the pressure in the separating funnel increases. So deflate. Since the funnel is inverted during the extraction and release, only the piston can be opened.

When the liquid is dispensed statically, the pressure of the gas decreases due to the decrease in the volatilization of the extractant, and the liquid in the separator funnel decreases after the liquid flows out of the lower layer, which is equivalent to increasing the volume. If you do not open the glass plug on the upper mouth, the liquid will not flow out properly.