| 摘要 |
PURPOSE:To efficiently separate acid and alkali at high concn. from an aq. salt soln. independently of the kind of salt by carrying out electrolysis with an anion exchange membrane contg. fluorine and made of a polymer represented by a specified general formula and a cation exchange membrane contg. fluorine. CONSTITUTION:An electrolytic cell is divided into chambers with an anion exchange membrane and a cation exchange membrane as diaphragms and an aq. salt soln. is fed to the middle chamber and electrolyzed to produce an aq. acid soln. in the anode chamber and an aq. alkali soln. in the cathode chamber. When acid and alkali are separated by electrolysis with the ion exchange membranes as mentioned above, a cation exchange membrane contg. fluorine is used as the cation exchange membrane and an anion exchange membrane contg. fluorine and made of a copolymer having repeating units represented by the general formula is used as the anion exchange membrane. In the formula, X is F or CF3, l is 0 or an integer of 1-5, m is 0 or 1, n is an integer of 1-5, each of p and q is a positive number, p/q=2-16, each of R1-R3 is lower alkyl, R4 is H or lower alkyl, Z(-) is a halogen anion and a is an integer of 2-10. Thus, restrictions on the kind of salt, electrolytic conditions, etc., can be eliminated. |
