Is there a difference between a chemical scrubbing device and a drying device?

The drying device only absorbs water-related substances such as water vapor, while the washing device excludes other mixed gases in one gas, for example, if there is CO and O2 in CO2, the suction device is used, and if there is only H2O gas in CO2, the drying device is used.

General principle: gas generator, impurity removal, drying, collection, tail gas treatment and other procedures, considering the order of drying and impurity removal, if the solution is used to remove impurities, the first purification and drying; If heating is used to remove impurities, before drying; If the solid absorbent is used to remove impurities, it is determined according to the title.

Tail gas treatment: toxic gas is directly emptied by solution (or solid) absorption or ignition of toxic gas, if the prepared substance is easy to hydrolyze, it is necessary to install a drying pipe at the tail to prevent air and water vapor from entering the hydrolysis.

Interface connection: the overall order of the device should be shortened in the absorption device; The gas measuring device should be short-feeded; The scrubbing device should be shortened; Dry the tube should be entered.

The gas generator is generally pressed: device selection and connection, air tightness inspection, loading solid drugs, adding liquid drugs, starting experiments, disassembling instruments, and its treatment.

Heating operation: Before the main body experiment is heated, the raw gas should be used to drive away the air and then ignite the alcohol lamp to prevent it. Second, to ensure the purity of the product, extinguish the principle of alcohol lamp first.

It doesn't feel like a pointless question.

The gas from the gas generator contains three substances: chlorine, HCL, water vapor The first step: washing gas, according to the principle that chlorine is insoluble in saturated brine, and HCL can be dissolved in saturated saturated saline, let the mixed gas pass through saturated brine, HCL is absorbed, and chlorine will not, so washing gas result:

Chlorine, water vapor.

Step 2: Drying, drying is mainly to remove water vapor, and you can use concentrated sulfuric acid The first floor is wrong, chlorine is insoluble saturated salt water is not because of chloride ion saturation, otherwise how can HCl be absorbed? This is because HCl is dissolved in water by several hundred volumes, and it is generally believed that it is completely dissolved in water, because it is a strong electrolyte, so it generates more hydrogen ions and chloride ions.

However, chlorine is less soluble in water and partially reacts with water (reversible!). In the case of hypochlorous acid and HCL, the reaction is inhibited according to Le Chatelier's principle, and the chlorine gas reacts with water, and the amount of reaction is very small for a period of time when the chlorine gas passes through the water. Therefore, there is basically no loss of chlorine gas through saturated salt water.

Saturated salt is to greatly increase the concentration of Cl-, in fact, it doesn't matter if you use KCl or BaCl2, the main reason is that salt is cheaper.