Process for the electrolysis of an aqueous sodium chloride solution comprising, in combination, a diaphragm process and a cation exchange membrane process
First Claim
1. A process for the electrolysis of an aqueous sodium chloride solution comprising, in combination, a diaphragm process in which sodium chloride contained in the catholyte is crystallization-separated by means of a crystallizer used in the diaphragm process and a cation exchange membrane process in which a weak saline solution is taken out of an anode chamber of an electrolytic cell for the cation exchange membrane process, characterized in that the sodium chloride obtained from said crystallizer is dissolved in the weak saline solution taken out of said anode chamber and the resulting saline solution is supplied into an anode chamber of an electrolytic cell for the diaphragm process.
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Abstract
In a process for the electrolysis of an aqueous sodium chloride solution comprising, in combination, a diaphragm process and a cation exchange membrane process, the sodium chloride obtained from the diaphragm process is dissolved in the weak saline solution obtained from the cation exchange membrane process to obtain a saline solution, which, in turn, is supplied to the anode chamber of the diaphragm process. By the present process, there can be obtained sodium hydroxide of which the impurities content is extremely low, with high efficiency.
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6 Claims
- 1. A process for the electrolysis of an aqueous sodium chloride solution comprising, in combination, a diaphragm process in which sodium chloride contained in the catholyte is crystallization-separated by means of a crystallizer used in the diaphragm process and a cation exchange membrane process in which a weak saline solution is taken out of an anode chamber of an electrolytic cell for the cation exchange membrane process, characterized in that the sodium chloride obtained from said crystallizer is dissolved in the weak saline solution taken out of said anode chamber and the resulting saline solution is supplied into an anode chamber of an electrolytic cell for the diaphragm process.
Specification