Production of sodium hypochlorite from liquid chlorine
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When producing sodium hypochlorite from liquid chlorine, it is not necessary for the liquid chlorine to be vaporized (as it used to be required to be converted into chlorine gas) in order to produce sodium hypochlorite; this method has its advantages and disadvantages (safety, production efficiency, quality)
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In the production of sodium hypochlorite from liquid chlorine, it is common for the liquid chlorine to vaporize into chlorine gas before being introduced into the liquid alkali solution. When I visited a factory a few days ago, they used liquid chlorine directly in the liquid alkali solution (without it needing to be vaporized into chlorine gas first). Is it safe to introduce liquid chlorine directly into the liquid alkali solution?
When liquid chlorine comes out of the steel cylinder and turns into a gas, it absorbs a large amount of heat; meanwhile, the reaction between chlorine and alkalis releases heat, so this method is feasible.
Are you saying that, under the same cooling conditions, the reaction of vaporized chlorine produced from liquid chlorine with an alkaline solution releases more heat in the reaction tank compared to when liquid chlorine is directly introduced into the alkaline solution?
Based on the information you provided, if this process is used, the chlorine delivery tube must be modified accordingly; it is necessary to increase the contact area between the surface of the chlorine delivery tube and the reaction mixture. In other words, liquid chlorine absorbs the temperature of the reaction mixture as it enters the reactor and vaporizes, and by the time it comes into contact with the reaction mixture, it is already in gaseous form. The advantage of this process is that it makes full use of the vaporization heat (endothermic process) of liquid chlorine, reducing equipment investment (including liquid chlorine vaporization units, steam boilers, etc.), as well as subsequent costs related to equipment operation, fuel consumption, and labor costs. It also improves energy efficiency and is environmentally friendly with low carbon emissions ； There are also some disadvantages: it requires higher operational standards compared to traditional processes, as it is necessary to prevent the reaction mixture from overheating and causing decomposition or pressure buildup in the reactor. Additionally, there is no isolation buffer between the liquid chlorine cylinder and the reactor; a one-way check valve must be installed between them to avoid backflow incidents.