Treatment of chloralkali feeds containing hydrogen peroxide...

Details Treatment of chloralkali feeds containing hydrogen peroxide... Treatment of chloralkali feeds containing hydrogen peroxide...

2005-07-26

2005-07-26

Nguyen, Ngoc-Yen (Department: 1754)

Coherent light generators

Particular pumping means

Chemical

C372S055000, C205S466000, C204S242000, C422S129000, C422S234000, C422S269000

Reexamination Certificate

active

06922429

ABSTRACT:
A method and apparatus for removing BHP contaminants (alkali hydroxide and H2O2) from a recycled aqueous alkali chloride solution stream before the stream is fed to a chloralkali cell so that the contaminants do not impair the operation of a chloralkali cell. Unwanted alkali hydroxide within the recycled alkali chloride brine solution is reacted with chlorine gas and converted into an alkali chloride, which is useful in the operation of the chloralkali cell, and oxygen gas, which is outgassed from the system. Any H2O2remaining in the recycled stream after elimination of the alkali hydroxide is reacted with chlorine to form HCl and oxygen gas. The HCl raises the pH of the brine solution, after which the pH may be adjusted by the addition of supplemental alkali hydroxide.

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