Capture of SO2, CO2, NO, NO2, Cl2, and how to remove them

The method used to collect the gas depends on the density and water solubility of the gas.

If it is difficult to dissolve in water, the drainage method can be used;

If the density is quite different from the density of the air, the air exhaust method can be used, and when the density of the gas is greater than that of the air, it is used.

The bottle mouth is vented upwards, and vice versa.

Therefore: SO2 (soluble in water, denser than air) uses the bottle mouth upward air discharge method.

CO2 (soluble in water, denser than air) is used to exhaust air upwards from the mouth of the bottle.

NO (insoluble in water, less dense than air but able to react with O2) is drained.

NO2 (soluble in water, denser than air) is vented upwards from the mouth of the bottle.

Cl2 (soluble in water, denser than air) uses the bottle mouth to exhaust air upwards.

I don't know if you're a junior high school student or a high school student, but there are some explanations for the specific operation. If you don't understand, you can continue to ask questions. Happy studying.

SO2 discharges saturated sodium bisulfite solution or upward exhaust air gas method.

CO2 discharge saturated sodium bicarbonate solution or upward exhaust method.

no Drainage method.

NO2 upward exhaust air method.

Cl2 discharge saturated saline or upward air exhaust method.

SO2 (upward exhaust air), CO2 (upward exhaust air), NO (drainage), NO2 (upward exhaust air), CL2 (upward exhaust air).

And how to get rid of it.

SO2 (plus alkali), CO2 (plus alkali), NO (plus excess oxygen plus alkali), NO2 (plus alkali), Cl2 (adding alkali).

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If you want to remove SO2 from CO2, you can use a saturated sodium bicarbonate solution, but if you still use sodium bisulfite to remove CO2 from SO2, you obviously don't notice that carbonic acid is much less acidic than sulfurous acid. Sodium bisulfite is acidic, carbon dioxide has very little solubility in it, almost insoluble, and the acidity of carbonic acid is much weaker than sulfurous acid, so there will be no reaction of NaHSO3+CO2=NAHCo3+SO2, so it is obviously not feasible to use this method to remove CO2 in SO2.

To remove CO2 from SO2, it is not possible to use chemical properties, CO2 does not have a specific absorbent, so only physical properties, that is, pressure cooling to make it into a liquid state and then separate. This is to separate them by taking advantage of the difference in conditions of their critical changes.

Hope it helps!

The method of removing a small amount of SO mixed in CO is to pass the mixed gas into the acidic potassium permanganate solution, and use the strong oxidation of acidic potassium permanganate to remove a small amount of SO.

The equation for the chemical reaction that occurs is given below.

5so₂+2h₂o+2kmno₄=2mnso₄+k₂so₄+2h₂so₄

Since SO is reducible, it is able to be absorbed and oxidized by the strong oxidant KMNO, whereas CO is not reducible and does not react with KMNO.

Therefore, a small amount of SO mixed in CO can be removed by an acidic potassium permanganate solution.

の by drainage.

Because の is insoluble in water.

It is not possible to use the air exhaust method. Because NO reacts with oxygen in the air to form NO2 (2NO+O2=2NO2), and the density of NO is similar to that of air (the molecular weight of NO is 30, and the average molecular weight of air is 29).

NO2 exhausts air upwards.

NO2 has a color, so you can know that the collection is full.

The drainage method cannot be used, NO2 will react with water to form NO3NO2 + H2O*****2HNO3 + NO NO2 can be collected by the air exhaust method, because the amount of NO2 is 46, which is greater than 29 of the air, so it is heavier than the air, and the upward air exhaust method is used. The drainage method cannot be used because NO2 reacts with water 3NO2 + H2O = 2HNO3 + NO

However, care should be taken to avoid NO2 spreading into the air and causing pollution.

CO2 collection.

The upward air exhaust method is feasible, but the density difference is not large, and the solubility of CO2 in water is not high, it is better to use the drainage method to be pure, the drainage method is completely feasible, if you want the CO2 to be insoluble, it is collected by the saturated NaHCO3 solution method, but the cost of this method is high.

What method is used to collect H2.

Drainage method (hydrogen is not allowed in water).

Downward exhaust air method (hydrogen is less dense than air).

no Drainage method.

NO2 upward exhaust air method.

CO2: Upward exhaust air method.

H2: Downward exhaust air method, drainage method.

Density is compared to air in terms of relative molecular mass, and the average relative molecular mass of air is 29.

If the relative molecular mass is greater than 29 and the density is greater than that of air, the upward air exhaust method is used.

If the relative molecular mass is less than 29 and the density is smaller than air, the downward air exhaust method is used.

If the relative molecular mass is close to 29, it cannot be collected by the exhaust method, and needs to be collected by the drainage method.

Method of removal: pass the gas through saturated baking soda.

solution (saturated with NaHCO3).

Reaction equations.

SO2 + NaHCO3 = NaHSO3 + CO2 strong acid. The principle of making weak acids, do not worry about CO2 dissolution, because ionization equilibrium saturated baking soda can inhibit CO2 dissolution, CO2 H2O = H+ HCO3-, which is reversible, and the bicarbonate ions in baking soda are very high to shift the balance to the left, so CO2 is insoluble. And the baking soda solution must be saturated, otherwise there will be excess water and CO2 reaction.

The principle of impurity removal: neither new impurities can be introduced, nor can the required substances be consumed.

In order to remove a small amount of SO2 gas from CO2, the gas can be passed through ( C NaHCO3 solution ).

n2hco3+so2=nahso3+co2

A: The following solutions can be sourced.

1) Acidic Cinna4 Kmno4 solution.

2) Bromine water. 3) Chlorinated water.

4) Saturate NaHCO3 solution.

Removal method: make the gas through saturated baking soda solution (saturated NaHCO3) reaction equation: SO2 + NAHC3 = NAHSO3 + CO2 strong acid to weak acid principle, do not worry about CO2 dissolution, because ionization equilibrium saturated baking soda can inhibit CO2 dissolution, CO2 H2O = H+ HCO3-, which is reversible, the bicarbonate ions in baking soda are very high to shift the balance to the left, so CO2 is insoluble.

And the baking soda solution must be saturated, otherwise there will be excess water and CO2 reactions.

The principle of removing impurities: neither can new impurities be introduced, nor can the required substances be consumed by the citrusin.