Where does the carbon dioxide in the neutralization tower come from?

What neutralization tower, what materials? I’ll help you analyze it

Calcium carbide is used to produce acetylene gas. It seems that carbon dioxide was produced at the beginning of the calcium carbide reaction. Inside the neutralization tower, there is a dilute alkali that absorbs the acidic substances brought by acidic acetylene gas

You’ve even become a moderator for fatty fish, haha. I think there’s calcium carbonate in your calcium carbide; figure it out by yourself for the rest.

Calcium oxide decomposes at high temperatures to produce carbon dioxide.

Calcium carbide is produced by melting coke and calcium oxide in an electric furnace, where an arc is generated by electrode discharge to cause fusion and electrolysis of these materials; as a result of this reaction, calcium carbide and carbon monoxide are formed. The molten calcium carbide is then discharged from the bottom of the furnace, after which it is crushed into lumps. Carbon monoxide is generally burned off. The temperature during this process is very high, over 2000 degrees, so it’s impossible for calcium carbonate to be formed. The coke also reacts or is completely burned to form carbon dioxide or carbon monoxide. The only possibility is that carbon monoxide gas is present within the calcium carbide. In subsequent processes, when calcium carbide reacts with water to produce acetylene, a small amount of carbon monoxide is released, and this carbon monoxide is then oxidized by oxidants such as air into carbon dioxide. I think this is the more likely scenario. The conversion of acetylene into carbon dioxide requires a strong oxidant; at least combustion must occur. My analysis may not be entirely accurate, but I hope it can provide some insight for you.

Then carbon dioxide dissolves in the alkaline solution and precipitates during the exothermic neutralization process.