AppliTek NV

AppliTek Introduces New On-Line Analyzers For HCl Burners for Chlorine Plants

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Source: AppliTek NV

The synthesis of hydrogen chloride ( HCl ) is performed by combustion of hydrogen ( H) and chlorine ( Cl) gas. Both the reaction and absorption heat in water are highly exothermic.

The reaction is            ½ H+ ½ Cl2 ————> HCl (gas) + 1667 kJ/mol

Hydrogen (H2) gas and chlorine (Cl2) gas are fed into a burner at controlled rates. The burner consists of two concentric tubes with chlorine flowing through the inner tube and hydrogen through the outer annulus. Above the burner, the gases are ignited to produce hydrogen chloride ( HCl ) gas. A hydrogen (H2) flow of at least 5% stoichiometric excess is recommended to ensure that a complete synthesis takes place. The hydrogen chloride gas, at a temperature of 2,000 to 2,500°C ( 3,632 to 4,532 °F ) , flows from the combustion chamber into an integrated isothermal falling-film absorber. The hydrogen chloride ( HCl ) gas is then absorbed by water or weak acid. The hydrochloric acid is normally produced with less than 1 ppm free chlorine ( Cl). By adjusting the absorption water ( weak acid ) supply rate, the desired hydrogen chloride ( HCl ) solution concentration is obtained.

The following on-line analyzer systems can be offered to control the performance and the safety of the hydrogen chloride ( HCl ) burner:

1.   Measurements in the chlorine ( Cl) gas feed to the hydrogen chloride ( HCl ) burner:

 on-line hydrogen ( H) in dry chlorine ( Cl) by high temp reactor ( H2 + Cl2  2HCl ) where hydrogen chloride ( HCl ) is formed and measured by multi-wavelength InfraRed analyzer system

typical range: 0 – 5%vol hydrogen ( H) in dry chlorine ( Cl)

 on-line chlorine ( Cl) in dry chlorine ( Cl) by multi-wavelength UV analyzer system

typical range: 50 – 100%vol chlorine ( Cl) in dry chlorine ( Cl)

 on-line oxygen ( O) in dry chlorine ( Cl) by Alternating Pressure Paramagnetic or Tunable Diode Laser ( TDL ) analyzer system

typical range: 0 – 25%vol oxygen ( O) in dry chlorine ( Cl)

2.   Measurements in the hydrogen (H2) gas feed to the hydrogen chloride ( HCl ) burner:

 on-line hydrogen ( H) in hydrogen ( H) by Thermal Conductivity ( TCD ) analyzer system ( explosion proof conform NEC or ATEX )

typical range: 95 – 100%vol hydrogen ( H) in hydrogen ( H)

 on-line oxygen ( O) in hydrogen ( H) by Electrochemical cell- or Alternating Pressure Paramagnetic- or Tunable Diode Laser ( TDL )analyzer system

typical range: 0 – 10%vol oxygen ( O) in hydrogen ( H)

3.   Measurement in the gas vent of the hydrogen chloride ( HCl ) burner:

 on-line hydrogen ( H) in vent of the hydrogen chloride ( HCl ) burner by Thermal Conductivity ( TCD ) analyzer system ( explosion proof conform NEC or ATEX )

typical range: 0 – 100%vol hydrogen ( H) in hydrogen ( H)

4.   Measurements in the liquid hydrogen chloride ( HCl ):

 on-line chlorine ( Cl) in hydrogen chloride ( HCl ) solution by wet chemical Universal Process Analyser UPA®colorimetric analyzer system

typical range: 0 – 10 ppm chlorine ( Cl)

 on-line iron ( Fe ) in hydrogen chloride ( HCl ) solution by wet chemical Universal Process Analyser UPA®colorimetric analyzer system

typical range: 0 – 1 ppm iron ( Fe )

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