Sulfuric acid electrolysis process

1. A sulfuric acid electrolysis process used in an electrolytic cell having an anode compartment separated from a cathode compartment by a diaphragm, a conductive diamond anode installed in said anode compartment, and a cathode installed in said cathode compartment, comprising the steps of:

supplying electrolyte containing sulfuric acid for electrolysis to said anode compartment and said cathode compartment, respectively, from outside; and

performing electrolysis to generate oxidizing agent in an anolyte in said anode compartment, wherein

a temperature of said electrolyte containing sulfuric acid supplied to said anode compartment and said cathode compartment is controlled to be 30 degree Celsius or more;

a flow rate F1 (L/min.) of said electrolyte containing sulfuric acid supplied to said anode compartment is controlled to be 1.5 times or more (F1/Fa≧1.5) a flow rate Fc (L/min.) of gas formed on an anode side as calculated from Equation (1) shown below; and

a flow rate F2 (L/min.) of said electrolyte containing sulfuric acid supplied to said cathode compartment is controlled to be 1.5 times or more (F2/Fc≧15) a flow rate Fc (L/min.) of gas formed on a cathode side as calculated from Equation (2) shown below:

Fa =( I×S×R×T )/(4×Faraday constant)  Equation (1)

Fc =( I×S×R×T )/(2×Faraday constant)  Equation (2)

I: Electrolytic current (A)

S: Time: 60 second (Fixed)

R: Gas constant (0.082 1·atm/K/mol)

K: Absolute temperature (273.15 degree Celsius+T degree Celsius)

T: Electrolysis temperature (degree Celsius)

Faraday constant: (C/mol).

2. The sulfuric acid electrolysis process as defined in claim 1 , wherein starting steps of the electrolysis follow a sequential order of: controlling temperature of the electrolyte; supplying electrolyte to the electrolytic cell; and then supplying electrolytic current to the electrolytic cell.

3. The sulfuric acid electrolysis process as defined in claim 1 , wherein electrolytic current supplied for said electrolysis step is controlled to have an electrolytic current value that is increased gradually from zero amperes (A) up to a targeted electrolytic current value, by 1 A/sec. or less.

4. The sulfuric acid electrolysis process as defined in claim 1 , wherein a sulfuric acid concentration of said electrolyte containing sulfuric acid supplied to said anode compartment is controlled to be 70% by mass or more.

5. The sulfuric acid electrolysis process as defined in claim 1 , wherein a current density for said electrolysis is controlled to be 20 A/dm 2 or more.