KREBS SWISS: Chlorine Gas Drying


In chloralkali plants, the chlorine gas is produced at elevated temperature from aqueous salt solutions. This chlorine gas is saturated with water vapour at the electrolysis cell operating temperature and further contains some brine mist. For liquefaction and many direct applications for chlorine gas, the water vapour and the brine mist must be removed completely. Significant amounts of moisture result in severe corrosion in the carbon steel equipment and piping used for dry chlorine gas and liquid chlorine. Most of the water vapour and all brine mist are usually removed by cooling and filtering the hot wet chlorine gas. Depending on the cooling end temperature, the cooled and filtered chlorine gas still contains a substantial amount of water vapour. For the removal of this residual water vapour the chlorine gas is further dried.

Chlorine gas from sources other than chloralkali electrolysis frequently contains other impurities which are removed by washing with water, so that such chlorine gas usually also must be dried.

Efficient and reliable chlorine gas drying is essential for the safety and long life of the downstream equipment and piping.

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Raw Materials

The services rendered include all services required for the execution of turn key projects. They are made available to our clients as required by the specific project.

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The moisture content of the dried chlorine gas from Krebs Swiss drying systems is reliably reduced to below 10 ppm w/w, which is fully adequate for liquefaction and most uses for direct chlorine gas. Krebs Swiss is very familiar with such downstream installations and, if required, assists also in these areas.

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Operational Requirements

The operational requirements for drying 1000 kg Cl2 in a Krebs Swiss drying system are typically as follows:
Sulfuric acid (98 % H2SO4 feed,
dilution to 75 to 80 % H
25 to 40 kg
Electric power 3 kW
Cooling water or chilled water 3 m3

The drying system is usually operated together with all other upstream and downstream chlorine processing installations by one shift operator.

Recent References
In the last two years KREBS SWISS took orders for five chlorine drying systems with capacities ranging from 110 to 600 tpd.

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