Chemie-Ingenieur-Technik p. 635 - 639 (1974)
Update date:2022-08-12
Topics:
Fremery
Hoever
Schwarzlose
Electrochemical synthesis of hydroquinone by anodic oxidation of benzene and cathodic reduction of the quinone transported in a branch stream of benzene has been tested in continuous operation for 4000 h in a pilot plant. The process utilizes the favorable solubilities of quinone in benzene and of hydroquinone in aqueous sulfuric acid as the electrolyte. The current efficiency was established as 40% for optimum volume/time yield with regard to the cell; under these conditions complete electrolyte purification is also accomplished. A branch flow of electrolyte taken from the cathode circulation via a cathodic post-reduction yields hydroquinone crystals by concentration; after a washing operation the product is of technical purity. Since all flows of the process can be completely recycled, entirely pollution-free hydroquinone production becomes feasible.
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