Compressed gas cylinders In organic chemistry experiments, gases are sometimes used as reactants. For example, hydrogen, oxygen, etc., gas is also used as a shielding gas, such as nitrogen, argon, etc., and some gases are used as fuels, such as gas, liquefied gas, and the like. All of these gases need to be packed in special containers. Compressed gas cylinders are generally used. The gas is stored in a cylinder at a relatively high pressure, which is convenient for transportation and can be used at any time in a general laboratory. Due to the high-pressure compressed gas contained in the cylinder, it is necessary to pay strict attention to safety when using it, otherwise it will be very dangerous.
Compressed gas pressures commonly used in organic chemistry laboratories are typically close to 200 atmospheres. The bottle of the whole cylinder is very solid, and the easy to damage is the exhaust valve installed at the outlet of the cylinder. Once the exhaust valve is damaged, the consequences are unimaginable, so for safety, it must be in the exhaust valve. Top with a cover. In addition, these compressed gas cylinders should be kept away from fire and corrosive substances such as acids and bases.
The compressed gas cylinders used in the laboratory are generally about 160 cm in height and have a gross weight of about 70 to 80 kg. For such a large object, if it is not fixed, once it falls down, it will definitely ruin something or hurt people, and there is no danger of high pressure gas itself. Therefore, for safety reasons, the cylinder should be fixed somewhere, such as at the table or corner (Figure 2.15).
For the convenience of transfer, a special cart (see Figure 2.16) is generally used. How to correctly identify the type of gas contained in the cylinder is also a very important thing. Although all gas cylinders are labeled with a label indicating the type and purity of the gas contained in the bottle, these labels are often damaged or rotted. To be on the safe side, all compressed gas cylinders are painted in different colors according to certain standards.
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