Method for recovering hydrogen chloride from chlorine based waste and use of recovered hydrogen chloride
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United States of America Patent
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May 24, 2005
Grant Date -
Nov 8, 2001
app pub date -
Apr 26, 2001
filing date -
Apr 28, 2000
priority date (Note) -
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Abstract
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.
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