Dangerous goods safety protection measures and protective equipment (2)

In addition, if the fume hood door is raised too high, the toxic and harmful gases in the fume hood will overflow and harm people

As a professional staff member of a chemical laboratory, they are faced with a variety of toxic and harmful gases or vapors of organic solvents that are more harmful than n-hexane.

The sample is picked up high, and harmful gas pounces on the face; as shown in Figure 8-16(b), the floor-standing fume hood door is raised high, the waste liquid bucket is not covered, and the harmful gas overflows the floor-standing fume hood, causing laboratory pollution to spread

Figure 8-16 Irregularities

When a R&D personnel did an acid methyl esterification reaction, an explosion suddenly occurred, and the reaction formula was

This reaction has been done before, and concentrated sulfuric acid is slowly added dropwise from the dropping funnel to the reaction flask

The fume cupboard door was originally made of ordinary glass.

Another example is the following reaction:

At room temperature, 22 g of tert-butyl hypochlorite was added to a 250 mL CCl ₄ solution of 24 g of trimethyl orthoacetate.

For ordinary R&D personnel, such an explosion is difficult to predict

The above two examples and many accidents tell us that standard operation and strict protection are very important.

How to prevent the fume hood door from falling suddenly? Management should be strengthened from three aspects.

Maintenance of the fume hood door: The cabinet door that can move up and down is completed by two steel cables above the door, a combination of pulleys and a "counterweight" that balances the quality of the cabinet door

Figure 8-17 The scene of the cabinet door falling after the cable is broken

(2) Protective baffle

The baffle used to prevent punching or explosions from hurting people.

Figure 8-18 Protective baffles of different materials

Usually, the protective baffle is placed in a place that is considered to be potentially dangerous to reduce the impact of explosions and other accidents