초록 ▼

A process for the production of chlorine by the electrolysis of aqueous sodium chloride solution in which a gaseous stream containing chlorine and carbon dioxide is passed into a first reaction vessel and thence into a second reaction vessel and aqueous sodium hydroxide solution is charged to the fi

A process for the production of chlorine by the electrolysis of aqueous sodium chloride solution in which a gaseous stream containing chlorine and carbon dioxide is passed into a first reaction vessel and thence into a second reaction vessel and aqueous sodium hydroxide solution is charged to the first reaction vessel and aqueous sodium hydroxide solution is separately charged to the second reaction vessel, an aqueous solution containing sodium hypochlorite being removed from the first reaction vessel and an aqueous solution containing an alkali metal carbonate being removed from the second reaction vessel. The process enables saleable alkali metal hypochlorite to be produced which may be substantially free of sodium carbonate, and also aqueous sodium carbonate solution which may be used to precipitate polyvalent metal salts in the purification of the aqueous sodium chloride solution.

대표청구항 ▼

A process for the production of chlorine by the electrolysis of an aqueous alkali metal chloride solution which process comprises the steps of (1) contacting an alkali metal carbonate with an aqueous alkali metal chloride solution which contains a polyvalent metal or metals in solution, precipitatin

A process for the production of chlorine by the electrolysis of an aqueous alkali metal chloride solution which process comprises the steps of (1) contacting an alkali metal carbonate with an aqueous alkali metal chloride solution which contains a polyvalent metal or metals in solution, precipitating therein compounds of polyvalent metals, and removing said precipitated compounds therefrom, (2) electrolysing the solution from step (1) in an electrolytic cell to produce an aqueous alkali metal hydroxide solution and a gaseous stream containing chlorine and carbon dioxide, (3) contacting the gaseous stream from step (2) containing chlorine and carbon dioxide, or a part thereof, with aqueous alkali metal hydroxide solution, in which step (3) of the process is effected in a plurality of reaction vessels, the gaseous stream containing chlorine and carbon dioxide, or a part thereof, being passed into a first reaction vessel or vessels and thence into a second reaction vessel or vessels and aqueous alkali metal hydroxide solution being charged to the first reaction vessel or vessels and aqueous alkali metal hydroxide solution being separately charged to the second reaction vessel or vessels, the process comprising the additional steps of (4) removing an aqueous solution containing alkali metal hypochlorite from the first reaction vessel or vessels, and (5) removing an aqueous solution containing alkali metal carbonate from the second reaction vessel or vessels.