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Machine translation
1. (WO1980001575) ELECTROCHEMICAL APPARATUS AND PROCESS FOR MANUFACTURING HALATES
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/1980/001575    International Application No.:    PCT/US1980/000042
Publication Date: 07.08.1980 International Filing Date: 18.01.1980
IPC:
C25B 1/26 (2006.01), C25B 9/06 (2006.01)
Applicants:
Inventors:
Priority Data:
8725 02.02.1979 US
Title (EN) ELECTROCHEMICAL APPARATUS AND PROCESS FOR MANUFACTURING HALATES
(FR) APPAREILLAGE ELECTROCHIMIQUE ET PROCEDE DE PREPARATION D"HALOGENATES
Abstract: front page image
(EN)An apparatus for the manufacture of halate, such as sodium chlorate, includes an electrolytic cell having a plurality of anodes (21) (23) (25) (27) and cathodes (35) (37) (39) (41), clearance passageways between which have electrolyte, hypohalite and gaseous electrolysis product, principally hydrogen moving upwardly between them, an enclosure (49) covering the tops of at least four such passageways and narrowing down to a passageway extending upwardly from the top of the enclosure and downward passage for circulation of electrolyte which includes an upper baffled portion (13) and a lower unbaffled portion (15), the unbaffled part being alongside the electrodes and extending to the bottom of the cell, from which electrolyte is drawn upwardly past the electrodes. Natural circulation due to gravity flow and density differences between the liquid electrolyte and that entrained in gas or having gas entrained in it is normally sufficient so that stirring or pumping means are not required. The invention provides a means for converting higher current density cells to lower current density cells so as to be more energy efficient. In such conversions additional anode-cathode units are installed between those already in place and gases generated from them are collected with gases generated from an adjacent originally present anode-cathode unit and are moved upwardly with entrained liquid through previously existing passages while other circulating electrolyte is moved downwardly, also through previously existing passageways, baffled and unbaffled. Other aspects of the invention related to particular types of spacers between electrodes and to more energy efficient lower current density electrochemical processes for manufacturing sodium chlorate.
(FR)Un appareillage pour la preparation d"halogenates, tels que le chlorate de sodium comprend une cellule electrochimique ayant une pluralite d"anodes (21, 23, 25, 27) et de cathodes (35, 37, 39, 41), des passages d"espacement qui permettent a l"electrolyte, a l"hypohalogenite et au produit d"electrolyse gazeux, principalement de l"hydrogene, de se mouvoir entre eux vers le haut une couverture (49) couvrant les parties superieures d"au moins quatre tels passages et se retrecissant vers un passage s"etendant vers le haut depuis le haut de la couverture et un passage inferieur pour la circulation d"un electrolyte, qui comprend une partie superieure a deflecteurs (13), la partie sans deflecteurs etant situee a cote des electrodes et s"etendant vers le bas de la cellule, d"ou l"electrolyte est soutire vers le haut en passant aux cotes des electrodes. La circulation naturelle due a la gravite et aux differences de densites entre l"electrolyte liquide et l"electrolyte entraine par les gaz ou contenant des gaz entraines sont normalement suffisants, ce qui implique que des moyens d"agitation ou de pompage ne sont pas necessaires. L"invention fournit un moyen pour convertir des cellules a densite de courant plus elevee en cellules a densite de courant plus basse afin d"etre plus efficaces energiquement. Dans de telles conversions des unites anode-cathode additionnelles sont installees entre celles deja en place et les gaz engendres sont recueillis avec les gaz engendres par une unite anode-cathode adjacente deja presente et sont circules vers le haut avec le liquide entraine au travers de passages existant precedemment, tandis que l"autre electrolyte circulant est deplace vers le bas au travers de passages existant precedemment avec et sans deflecteurs. D"autres aspects de l"invention se rapportant a des types particuliers d"entretoises entre les electrodes et a des procedes electrochimiques plus efficaces en energie a densite de courant plus basse pour la preparation de chlorate de sodium sont egalement decrits.
Designated States:
Publication Language: English (EN)
Filing Language: English (EN)