in water heating a mixture of NaNO3 and Fe2O3 in a mechanical furnace during continous revolving with combustible gases; decompn. of Na2Fe2O4 with water to NaOH soln. and Fe2O3;;
in water byproducts: Mg-phenolate; Electrolysis; recovery from textil industry waste liquors: stirring with Mg-phenolate to generate Na-phenolate, separation of insol. Mg-salts, react. with MgO (regeneration of Mg-phenolate, circular process);;
in water byproducts: H2SO4; Electrolysis; recovery from textil industry waste liquors: generation of NaCl by addn. of HCl to Na2SO4-containing soln., electrolysis of aq. NaCl-soln. (circular process);;
in not given Electrolysis; arrangement with diaphragms; Cu anode; liquid film between 2 porous walls of separation between anode and cathode region, regenaration by circulation;;
