I would like to ask whether hydrogen chloride in gas can be adsorbed using solid caustic soda
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The process involves a vacuum distillation tower; the product of distillation is primarily ethanol, with 1%–3% hydrogen chloride present. The vacuum level is -0.08 MPa. To prevent acidic gases from causing corrosion in the vacuum pump, an alkaline solution is installed before the pump’s inlet for neutralization. The distillation medium has now been changed to DMF and hydrogen chloride, and the distillation vacuum level has been increased to -0.099 MPa. As mentioned earlier, under vacuum with an alkaline solution present, the solution boils and gets drawn away; could solid caustic soda be used for neutralization instead? What is the neutralization effect of solid caustic soda? How should solid caustic soda be arranged so as not to affect the vacuum level? There are no experts with similar expertise to provide some guidance; thank you!
As mentioned before, under vacuum with an alkaline solution present, the solution will boil and be drawn away… Will it really boil and be drawn away? Also, regarding the synthesis of caustic soda as you mentioned, it doesn’t seem like that method is used
Definitely not. Hydrogen chloride has no acidity without water. Moreover, the contact area for gas-solid reactions is too small.
Sure. If the caustic soda adsorption tank is designed to be too small, resistance will be generated, and the pumping speed of the vacuum pump will be affected.
Liquid caustic soda can be used, but the appropriate concentration needs to be adjusted. The poster should check the physicochemical data manual for the chlor-alkali industry to find out the relationship between liquid caustic concentration, temperature, and water vapor partial pressure
Liquid caustic soda can be used, but the appropriate concentration needs to be adjusted. The poster should check the physicochemical data manual for the chlor-alkali industry to find out the relationship between liquid caustic concentration, temperature, and water vapor partial pressure
No. The two of them are ionic reactions. It is recommended to cool the alkaline solution before exporting it, or simply ignore it; in any case, what evaporates are only alcohol and hydrogen chloride, which will not corrode the pump
Why consider neutralization? There is now a new material that can provide excellent protection for equipment against hydrochloric acid; I wonder if the original poster is interested
{:3_50:} Organic amines can be used, and then regenerated with liquid alkali