Sources of sodium bicarbonate

1. Industrial caustic soda contains a small amount of sodium carbonate. 2. Under neutral conditions, potassium permanganate reacts with acetylene; the oxidizing power of sodium hypochlorite is similar to that of potassium permanganate in neutral conditions (slightly lower, as can be determined from their electrode potentials). Therefore, sodium hypochlorite may react with acetylene. Please advise

Personally, I think carbon dioxide may originate from the converter, as the carrier for the catalyst is activated carbon. Please feel free to correct me!

In my opinion, during the entire process of vinyl chloride synthesis, the feed gas contains trace amounts of oxygen, which reacts with graphite at high temperatures to produce carbon dioxide

1. It is a fact that industrial caustic soda contains carbon dioxide. 2. If carbon dioxide is generated during the conversion process, on the one hand, the amount of carbon dioxide would be very large, making it impossible for such a large amount of oxygen to be present; on the other hand, how can carbon dioxide be explained in the neutralization tower?

On the other hand, there is an excessive amount of activated carbon in the converter; even if anything is produced, it is carbon monoxide. I don’t think this is the cause

The saline added to the electrolyzer contains dissolved carbon dioxide. After electrolysis, hydrogen and chlorine enter the synthesis furnace, and then, along with hydrogen chloride, they proceed to the mixer, converter, and finally to the alkali scrubber. The industrial water and slurry filtrate added to the acetylene generator contain saturated carbon dioxide. Arrives at the alkali washing process along with acetylene gas.

In the slurry filtrate, carbon dioxide should exist in the form of a saturated calcium carbonate solution. So how can carbon dioxide be separated out in the alkaline environment of the generator? Therefore, dissolved carbon dioxide in the clear solution is not the main cause

Personally, I think carbon dioxide should come from the air. I. The slurry filtrate contains saturated calcium hydroxide, which is capable of absorbing large amounts of carbon dioxide from the air ； II. When the slurry filtrate comes into contact with calcium carbide, a vigorous exothermic reaction occurs. Due to the presence of impurities such as sulfur and phosphorus in calcium carbide, hydrogen sulfide and phosphine gases are generated. Some of these acidic gases react with calcium hydroxide in the slurry, while others react with carbonate and bicarbonate ions to form carbon dioxide. Most of these gases cannot be completely absorbed by the slurry due to the high local temperatures resulting from the reactions and the short residence time in the generator; as a result, they proceed to the next processing stage along with acetylene gas. The concentrations of carbon dioxide, hydrogen sulfide, and phosphine may reach a certain equilibrium ratio as a result of these intense and rapid reversible reactions ； III. Carbon dioxide reacts with caustic soda in the neutralization process to form sodium bicarbonate. Please ask those with more knowledge to give me some advice!