Hydrochloric Acid Desorption
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Hydrochloric Acid Desorption
HCl gas is produced by distillation of hydrochloric acid solutions with a
concentration of 23-35% under pressure.
The hydrochloric acid solution can be produced in an absorption system, as
shown in absorption of HCL gas
The HCl gas may originate from a combustion process or an HCl synthesis
plant. HCl gas from an HCl synthesis plant always contains an excess of hydrogen for complete reaction of chlorines. In this case, the hydrogen is removed from the HCl gas by absorption followed by distillation.
Absorption is usually carried out at atmospheric pressure. Depending on the
resulting absorption temperature, the absorption solution has to be cooled in a
downstream heat exchanger.
To minimize the consumption of steam and cooling water, the feed steam to the column is heated with hot, azeotropic acid. The preheated solution is fed into the column below the reflux stream. Water-containing HCl gas is distilled. The concentration of the HCl gas increases in the first condenser and in subsequent gas coolers. In these heat exchangers, water is removed from the gas stream. After passing through a high-performance demister, the dry product gas can ultimately be achieved.
Capacity and available sizes
The desorption systems can be designed for a capacity of 3 to 240 t/d 100% HCL per system. The equipment sizes are matched to the customer's needs.
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