How to use a nitrogen balloon to safely seal the reaction (1)

1.

Nitrogen balloons are widely and frequently used in chemical laboratories

Figure 23-35 Nitrogen balloon sealing reaction

However, random use of nitrogen balloons will cause accidents, and there have been many accident lessons, such as the following explosion accident

A researcher does an amplified alkylation reaction:

Add 1.

Figure 23-36 Situation in the fume hood after the explosion

The cause of the accident: According to the theoretical calculation, 100L of hydrogen was produced in this reaction, and there was a significant valve temperature (the temperature required for the melting or dissolution of mineral oil and the temperature required for sodium hydride to remove the active hydrogen from the substrate), and dozens of liters of hydrogen generated instantly would burst.

2.

How to use a nitrogen balloon to safely seal the reaction? The chlorine balloon can be tied to the elbow pipe, straight sleeve or tee, as shown in Figure 23-35

It can also be directly sleeved on the condenser tube or needle tube, as shown in Figure 23-37 and Figure 23-38

Figure 23-37 The nitrogen ball is placed on the condenser tube

Figure 23-38 The nitrogen ball is placed on the needle tube

Among the above methods, it is recommended to tie the nitrogen ball to the tee, because the tee is easy to inflate, easy to operate, and has a larger aperture and is relatively unobstructed

For reaction flasks below 100mL, you can consider the method of tying a nitrogen balloon to the needle, but before using it, check whether the needle is unblocked