To provide a process for recovering high quality hydrogen chloride rationally
with good economical efficiency, particularly hydrogen chloride with an elevated
quality level to be provided as the feedstock for the oxychlorination reaction
in producing dichloroethane and a vinyl chloride monomer from a hydrogen chloride
gas to be generated by the combustion of chlorine based waste. To use a process
for recovering hydrogen chloride from chlorine based waste comprises adding water
and a reducing agent to an acid gas obtained by the combustion of chlorine based
waste to effect reaction to obtain a crude hydrogen chloride aqueous solution having
an oxidation-reduction potential of not higher than 900 mV and then, distilling
the crude hydrogen chloride aqueous solution to obtain a purified hydrogen chloride gas.
