POTASSIUM PERFLUOROALKANE SULPHONAT Russian patent published in 2010 - IPC C07C303/32 C07C309/06 

FIELD: chemistry.

SUBSTANCE: method of producing potassium perfluoroalkane sulphonate involves a stage for electrochemical fluorination where an alkanesulphonyl halide compound is subjected to electrochemical fluorination in anhydride hydrogen fluoride, thereby obtaining a gas which contains perfluoroalkanesulphonyl fluoride as a main component; a gas absorption stage where the obtained gas is reacted with an aqueous solution of potassium hydroxide to obtain a gas-absorbing solution which contains potassium perfluoroalkane sulphonate; a purification stage where impurities such as potassium fluoride, potassium hydroxide and potassium sulphate are removed; and a concentration and collection stage where the aqueous solution from which impurities have been removed is concentrated and dried. Concentration of protons in the reaction solution is preferably kept in the range from 150 to 1500 parts per million to prevent formation of byproducts.

EFFECT: improved method of producing perfluoroalkane sulphonate.

15 cl, 2 dwg, 10 ex