Hoechst-Uhde cells

K. Schneiders, J. Schulze Improvement in the Hoechst-Uhde Membrane Cell, Modern Chlor-Alkali-Technology, vol. 6, 1995. 

And, at last, shortcomings of techniques, mentioned above, have caused a number of attempts to use hydrochloric acid as an electrolyte for hydrogen and chlorine obtaining. As far back as 1964, the firm "Hoechst" obtained 100 tons of chlorine per day with the help of a cell, worked out by the firm "Friedrich Uhde". This technique is widely used nowadays about 1 min tons of chlorine has been obtained by hydrochloric acid electrolysis by 1990. 

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