Electrochemical purification of chlorine
OwnerSrinivasan Sarangapani, Tilak Bommarajuinventors
Life of this patent
Estimating the term…
Abstract
A process for separating chlorine gas from a mixture with other gases is disclosed. In the process, chlorine gas, either as an impure gas or as dissolved gas in hydrochloric acid, is reduced at the cathode of an electrochemical cell to form chloride ions, which are discharged at the anode of the same cell as pure chlorine gas. An apparatus for performing the process is also disclosed.
Claims20
A process for separating chlorine gas from a mixture with other gases comprising
- (A) electrolyzing said chlorine gas to form chloride ion;
- (B) separating said chloride ion from said mixture of gases;
- and
- (C) electrolyzing said chloride ion to form chlorine gas at the anode.
A process for separating chlorine gas from a tail gas containing about 1 to about 99 wt % chlorine comprising
- (A) passing said tail gas into 1 to 10 N hydrochloric acid, whereby chlorine gas in said tail gas dissolves in said hydrochloric acid, forming a solution;
- (B) separating said solution from said tail gas;
- and
- (C) electrolyzing said solution in an electrolytic cell having a cathode catalyst selected from the group consisting of Pt, Ru, a Pt—Ru alloy, Ir, Rh, RuOx, and Pt doped RuOx, either as pure metal black or supported on carbon or graphite, and Pt—Ru, RuOx, and Pt coatings on porous titanium and an anode catalyst selected from the group consisting of C, RuO2+TiO2, RuOx2+IrO2, RuO2+TiO2+IrO2, and mixtures thereof, coated on a Ti substrate by a thermal decomposition technique, whereby chlorine gas is discharged at the anode.
Apparatus for separating chlorine gas from a mixture with other gases comprising
- (A) an electrolytic cell having
- (1) a cathode;
- and
- (2) an anode;
- (B) a mixture of gases including chlorine at said cathode, whereby chlorine is reduced to chloride ions at said cathode;
- and
- (C) means permitting the transport of said chloride ions to said anode, whereby said chloride ions are oxidized to chlorine gas.
Dependencies are inferred from the claim text.