The separating funnel is made of borosilicate glass 3.3 experimental instrument, in particular relates to a separating funnel for chemical experiments. The utility model comprises a funnel body and a ground-in glass stopper covering the upper mouth of the funnel body. A glasscock is installed at the lower of the funnel body. Practical use can make the experimental operation process easy to control and reduce labor intensity. When the amount of liquid needed to be separated is large, the two liquids in the funnel body can be simultaneously flowed to the lower pipe by moving the glasscock, and can be completed at one time without changing the container. The main function of the separating funnel is to control the rate of chemical reaction. It is a better experimental vessel in scientific research and chemical experiments. The liquid separating funnel is divided into global shape and pear shape. The neck of the global- shape is longer. It is mostly used in gas-making equipment for dripping liquid. The neck of the pear-shape is relatively short, and it is commonly used as an instrument for extraction operation.

There is a glasscock in the neck of the separating funnel, which is an important reason why it is different from the common funnel. Because there is no glasscock in the neck of the common funnel, it can not control the liquid flexibly. Water is injected into the funnel to check whether the cock is leaking or not. Only the non-leaking separating funnel can be used. The amount of liquid added in the funnel should not exceed 3/4 of the volume. And alkaline liquids should not be filled. To prevent impurities from falling into the funnel, the stopper on the funnel mouth should be covered. When in use, the left-handed tiger mouth holds the funnel ball and rotates the glasscock with the thumb and index finger to control the fluid addition. At this time, the small groove of the glass stopper should be aligned with the small hole on the side of the funnel mouth, so that the liquid addition can proceed smoothly.

When the liquid in the separating funnel flows downward, the glasscock can control the flow of liquid. To stop the reaction, the glasscock must be closed tightly. Therefore, the dropping of liquid can be stopped immediately. When discharging liquid, the groove on the stopper should be aligned with the small hole on the mouth of the funnel. At this time, the air inside and outside the funnel is connected and the pressure is equal, so that the liquid in the funnel can flow out smoothly. When separating liquid, according to the principle of "downflow and uppour", the glasscock is opened to let all the lower liquid flow out and the glasscock is closed. The upper layer poured out from the upper mouth. The separating funnel cannot be heated. The funnel should be washed clean after use. The long-term unused separating funnel should wipe the cock clean, put a piece of paper between the cock and the groove, and cover the cock with an rubber band to prevent adhesion at the ground area.

Purpose:

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

2.Separation and Purification of Material: Separation of two immiscible liquids formed after extraction.

Assembly:

1. Check whether the glass stopper and glasscock are matched with the separating funnel. If not, they often leak or can not be operated at all. In order to use an incompatible separating funnel, it is necessary to test whether the funnel is suitable and leaking after assembly, and then use it after confirmation.

2. Insert a rubber ring with a suitable diameter at the groove of the cock (cut a small circle from the latex tube with a suitable diameter) to prevent the leakage of liquid due to loosening of the cock during operation or the loss of liquid due to falling off.

3. When the separating funnel needs to be dried, special attention should be paid to pulling out the glasscock to check whether it is clean and dry. If the cock does not meet the requirements, it can be used after being washed and dried.

Graduation: printed graduation, w/o graduation

Shape: pear, globe