DE439399C - Process for reducing the attack on graphite and carbon electrodes in the electrolysis of chlorides - Google Patents

Process for reducing the attack on graphite and carbon electrodes in the electrolysis of chlorides

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Publication number
DE439399C
DE439399C DEK92788D DEK0092788D DE439399C DE 439399 C DE439399 C DE 439399C DE K92788 D DEK92788 D DE K92788D DE K0092788 D DEK0092788 D DE K0092788D DE 439399 C DE439399 C DE 439399C
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DE
Germany
Prior art keywords
graphite
attack
electrolysis
chlorides
reducing
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
DEK92788D
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German (de)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Chemische Werke Koholyt A G
KOENIGSBERGER ZELLSTOFF FABRIK
Original Assignee
Chemische Werke Koholyt A G
KOENIGSBERGER ZELLSTOFF FABRIK
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Application filed by Chemische Werke Koholyt A G, KOENIGSBERGER ZELLSTOFF FABRIK filed Critical Chemische Werke Koholyt A G
Priority to DEK92788D priority Critical patent/DE439399C/en
Application granted granted Critical
Publication of DE439399C publication Critical patent/DE439399C/en
Expired legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B1/00—Electrolytic production of inorganic compounds or non-metals
    • C25B1/01—Products
    • C25B1/34—Simultaneous production of alkali metal hydroxides and chlorine, oxyacids or salts of chlorine, e.g. by chlor-alkali electrolysis

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  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Electrodes For Compound Or Non-Metal Manufacture (AREA)

Description

Verfahren zur Verminderung des Angriffs von Graphit- und Kohleelektroden bei der Elektrolyse von Chloriden.Process for reducing the attack on graphite and carbon electrodes in the electrolysis of chlorides.

Zusatz zum Patent 437532. In dem Patent 437532 ist ein Verfahren zur Verminderung-des Angriffs von Graphit- oder Kohleelektroden bei der Elektrolyse von Chloriden beschrieben, -das dadurch gekennzeichnet ist, daß man den Elektrolyten ganz oder teilweise durch die beim Brennprozeß der Elektroden entstehenden Poren in das Bad einfließen läßt.Addition to patent 437532. Patent 437532 describes a process for reducing the attack of graphite or carbon electrodes in the electrolysis of chlorides, which is characterized in that the electrolyte is wholly or partly through the pores produced during the burning process of the electrodes can flow into the bath.

Bei der weiteren Bearbeitung hat sich nun gezeigt, daß sich der Angriff der Graphit- und Kohleelektroden noch erheblich weiter vermindern läßt, wenn man den durch die Poren dem Bade zufließenden Elektrolyten saure Eigenschaften verleiht, was z. B. durch Zusatz von Säuren erfolgen kann. Man kann dieses Verfahren in der Weise abändern; daß man durch die Poren der Elektroden lediglich eine wäßrige Salzsättrelösung schickt, während man den Elektrolyten selber auf die übliche Weise der Zelle zuführt. Da man annehmen muß, daß eine Oxydation der Anoden besonders durch zuwandernde OH-Ionen verursacht wird, so wird bei vorliegendem Verfahren in den Poren der Elektrode stets für eine genügende Azidität gesorgt, die hinreicht, um (lie zuwandernden OH-Ionen sofort zu neutralisieren, bevor dieselben durch anodische Entladung der Elektrode gefährlich werden können.Further processing has now shown that the attack the graphite and carbon electrodes can be reduced considerably further if imparts acidic properties to the electrolytes flowing into the bath through the pores, what z. B. can be done by adding acids. You can do this in the Change way; that through the pores of the electrodes only an aqueous salt acid solution while the electrolyte is fed into the cell in the usual way. Since one must assume that the anodes are oxidized, especially by migrating OH ions is caused, so in the present method is always in the pores of the electrode sufficient acidity is ensured, which is sufficient to remove the migrating OH ions neutralize immediately before the same by anodic discharge of the electrode can be dangerous.

Beispiel i.Example i.

Eine stabförmige Graphitelektrode von 3 0 mm Durchmesser und i 5o mm Länge wurde mit einer zentralen Bohrung von io mm lichter Weite versehen, die bis auf i 5 mm Entfernung vom Boden führte. Diese Elektrode wurde zugleich finit einer genau ebenso geformten, jedoch ungebohrten Elektrode als Anode in eine Elektrolysierzelle eingebaut. Der Elektrolyt bestand aus sulfathaltiger Kochsalzlösung. Durch die Bohrung der erstgenannten Elektrode wurde unter einem hydrostatischen Überdruck von io cm eine ioprozentige Kochsalzlösung, die 5prozentige Salzsäure enthielt, hindurchgeleitet. Beide Elektroden tauchten io cm tief in den Elektrolyten und waren mit einer Stromstärke von je 7 Ampere belastet. Die Temperatur in der Zelle betrug 5o'. Nach 5oo Amperestunden wurden die Elektroden aus dem Bade entfernt. Es zeigte sich bei der durchflossenen Elektrode eine nur ganz geringfügige Volumenabnahme, während die nichtdurchflossene Elektrode eine. solche von 30 Prozent aufwies, natürlich bezogen auf den im Elektrolyten befindlichen Teil. Beispiele.A rod-shaped graphite electrode of 3 mm in diameter and 0 i 5o mm length was provided with a central bore of io mm internal diameter, up to 5 mm distance i resulted from the ground. At the same time, this electrode was finitely built into an electrolysis cell as an anode, which was exactly shaped but undrilled. The electrolyte consisted of a sulphate-containing saline solution. An 10% saline solution containing 5% hydrochloric acid was passed through the bore of the first-mentioned electrode under a hydrostatic overpressure of 10 cm. Both electrodes were immersed 10 cm deep in the electrolyte and were loaded with a current of 7 amperes each. The temperature in the cell was 50 '. After 500 ampere hours, the electrodes were removed from the bath. There was only a very slight decrease in volume in the case of the flowed-through electrode, while the non-flowed-through electrode showed a. those of 30 percent, of course based on the part in the electrolyte. Examples.

Zwei Elektroden von genau denselben Dimensionen wie in Beispiel i wurden in einen Elektrolyten, bestehend aus einer iprozentigen Ammonsulfatlösung, jedoch nur 3 crn tief, eingetaucht. Temperatur und Stromstärke blieben dieselben wie in Beispiel i. Die durchbohrte Elektrode wurde mit einer ioprozentigen Salzsäurelösung gespeist. Nach 5oo Amperestunden war von der nichtbehandelten Elektrode über die Hälfte verbraucht, bezogen auf den eintauchenden Teil, von der behandelten Elektrode etwa 15 Prozent.Two electrodes of exactly the same dimensions as in example i were immersed in an electrolyte consisting of an I% ammonium sulfate solution, but only 3 cm deep, submerged. The temperature and current remained the same as in example i. The pierced electrode was washed with an 10 percent hydrochloric acid solution fed. After 500 ampere hours, the untreated electrode was over Half consumed, based on the immersed part, of the treated electrode about 15 percent.

Claims (2)

PATENTANSPRÜCHE: i. Abänderung des durch Patent 437532, Anspruch i bis 3, geschützten Verfahrens zur Verminderung des Angriffs von Graphit- oder Kohleelektroden bei der Elektrolyse -von Chloriden, dadurch gekennzeichnet; daß man den durch die Poren der Elektrode strömenden Elektrolyten saure Eigenschaften verleiht. PATENT CLAIMS: i. Modification of the process protected by patent 437532, claims 1 to 3, for reducing the attack on graphite or carbon electrodes in the electrolysis of chlorides, characterized; that the electrolytes flowing through the pores of the electrode are given acidic properties. 2. Abänderung gemäß Anspruch i, dadurch.-gekennzeichnet, daß man durch die Poren der Elektroden eine wäßrige Salzsäure strömen läßt, während der Elektrolyt dem Bade auf die übliche Weise zugeführt wird. - -2. Modification according to claim i, characterized in that one goes through an aqueous hydrochloric acid can flow through the pores of the electrodes, while the electrolyte is added to the bath in the usual way. - -
DEK92788D 1925-02-06 1925-02-06 Process for reducing the attack on graphite and carbon electrodes in the electrolysis of chlorides Expired DE439399C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEK92788D DE439399C (en) 1925-02-06 1925-02-06 Process for reducing the attack on graphite and carbon electrodes in the electrolysis of chlorides

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEK92788D DE439399C (en) 1925-02-06 1925-02-06 Process for reducing the attack on graphite and carbon electrodes in the electrolysis of chlorides

Publications (1)

Publication Number Publication Date
DE439399C true DE439399C (en) 1927-01-11

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
DEK92788D Expired DE439399C (en) 1925-02-06 1925-02-06 Process for reducing the attack on graphite and carbon electrodes in the electrolysis of chlorides

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DE (1) DE439399C (en)

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