Abstract This application relates to a process of producing chlorine dioxide which utilizes hydrochloric acid as a feed material. The process may be operated to have substantially only chlorine dioxide and hydrogen as products. The process utilizes an electrolytic cell to produce an alkali metal hydroxide, chlorine and hydrogen from an aqueous solution of alkali metal chlorides. The alkali metal hydroxide and chlorine that are produced are reacted to form an alkali metal hypochlorite, which in turn is converted into an alkali metal chlorate. The chlorate is reacted with hydrochloric acid to produce chlorine dioxide, chlorine and an aqueous solution of alkali metal chloride. The chlorine dioxide is recovered. The chlorine produced may be used in the prior step by reaction with alkali metal hydroxide or may be burned with hydrogen to produce HCl and utilized in the process. The aqueous solution of alkali metal chloride is recycled used as a feed material for the electrolytic cell.
A CONTINUOUS PROCESS FOR THE PRODUCTION OF CHLORINE DIOXIDE WHICH COMPRISES THE STEPS OF A. ELECTRLYZING AN AQUEOUS SOLUTION OF ALKALI METH AL SALTS CONTAINING A MAJOR AMOUNT OA ALKALI METAL CHLORIDES TO FORM I, A SOLUTION CONTAINING ALKALI METAL HYDROXIDES, II. GASEOUS CHLORINE, III. GASEOUS HYDROGEN. B. REACTING SAID CHLORINE AND SAID SOLUTION CONTAINING ALKALI METAL HYDROXIDES TO FORM A SOLUTION CONTAINING ALKALI METAL HYPOCHLORITES, C. ADJUSTING THE PH OF SAID SOLUTION CONTAINING ALKALI METAL HYPOCHLORITES TO BETWEEN 6-8 TO CJNVERT SAID SOLUTION CONTAINING ALKALI METAL HYPOCHLORITES TO A SOLUTION CONTAINING ALKALI METAL CHLORATES AND ALKALI METAL CHLORIDES, D. RECYCLING A FIRST PORTION OF SAID SOLUTION FROM STEP (C) TO STEP (A),
Claim 2
Dependent Claim
113 words
A CONTINUOUS PROCESS FOR THE PRODUCTION OF CHLORINE DIOXIDE WHICH COMPRISES THE STEPS OF A. ELECTRLYZING AN AQUEOUS SOLUTION OF ALKALI METH AL SALTS CONTAINING A MAJOR AMOUNT OA ALKALI METAL CHLORIDES TO FORM I, A SOLUTION CONTAINING ALKALI METAL HYDROXIDES, II. GASEOUS CHLORINE, III. GASEOUS HYDROGEN. B. REACTING SAID CHLORINE AND SAID SOLUTION CONTAINING ALKALI METAL HYDROXIDES TO FORM A SOLUTION CONTAINING ALKALI METAL HYPOCHLORITES, C. ADJUSTING THE PH OF SAID SOLUTION CONTAINING ALKALI METAL HYPOCHLORITES TO BETWEEN 6-8 TO CJNVERT SAID SOLUTION CONTAINING ALKALI METAL HYPOCHLORITES TO A SOLUTION CONTAINING ALKALI METAL CHLORATES AND ALKALI METAL CHLORIDES, D. RECYCLING A FIRST PORTION OF SAID SOLUTION FROM STEP (C) TO STEP (A),
Claim 3
Dependent Claim
16 words
The process of claim 1 wherein the chlorine from step (g) is recycled to step (b).
Claim 4
Dependent Claim
24 words
The process of claim 1 wherein step (c) is carried out by adjusting the pH of the solution to between about 6.8 and 7.2.
Claim 5
Dependent Claim
21 words
The process of claim 1 wherein chlorine from step (g) is reacted with hydrogen from step (a) to produce hydrogen chloride.
Claim 6
Dependent Claim
15 words
The process of claim 4 wherein the said hydrogen chloride is utilized in step (e).
Claim 7
Dependent Claim
18 words
The process of claim 1 wherein steps (a), (e) and (f) take place in a single electrolytic cell.