DE900210C - Process for impregnating graphite parts, which are preferably to be used in chlor-alkali electrolysis cells - Google Patents

Process for impregnating graphite parts, which are preferably to be used in chlor-alkali electrolysis cells

Info

Publication number
DE900210C
DE900210C DEC2183D DEC0002183D DE900210C DE 900210 C DE900210 C DE 900210C DE C2183 D DEC2183 D DE C2183D DE C0002183 D DEC0002183 D DE C0002183D DE 900210 C DE900210 C DE 900210C
Authority
DE
Germany
Prior art keywords
chlor
graphite parts
electrolysis cells
alkali electrolysis
graphite
Prior art date
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
DEC2183D
Other languages
German (de)
Inventor
Dr Gert Morgenstern
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.)
Hoechst AG
Original Assignee
Hoechst AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hoechst AG filed Critical Hoechst AG
Priority to DEC2183D priority Critical patent/DE900210C/en
Application granted granted Critical
Publication of DE900210C publication Critical patent/DE900210C/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/009—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone characterised by the material treated
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
    • C04B41/46—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with organic materials
    • C04B41/47—Oils, fats or waxes natural resins
    • C04B41/478—Bitumen, asphalt, e.g. paraffin
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/80—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only ceramics
    • C04B41/81—Coating or impregnation
    • C04B41/82—Coating or impregnation with organic materials
    • 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
    • C25B11/00—Electrodes; Manufacture thereof not otherwise provided for
    • C25B11/04—Electrodes; Manufacture thereof not otherwise provided for characterised by the material
    • C25B11/042—Electrodes formed of a single material
    • C25B11/043—Carbon, e.g. diamond or graphene
    • C25B11/044—Impregnation of carbon

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Structural Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Metallurgy (AREA)
  • Civil Engineering (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Ceramic Products (AREA)

Description

Verfahren zum Imprägnieren von vorzugsweise in Chloralkalielektrolysezellen zu verwendenden Graphitteilen Es ist bekannt, poröse Werkstoffe, wie Holz, Mauerwerk, Graphit od.,dgl. gegen Eindringen von Flüssigkeiten oder Gasen durch Imprägnieren zu schützen. Hierfür sind beispielsweise Öle, Teere, Wachse, Paraffin und Bitumen geeignet. Man bat derartige Stoffe u. a. auch schon zum Imprägnieren von Graphitteilen, die in den Gasraum von Elektro lysezellen für die Chlorerzeugung eingeführt sind, benutzt; diese Imprägniermittel versagen aber bei Grap'hitteilen, die sich in dem Raum befinden, der ,die heiße, chlorhaltige Lösung enthält.Process for impregnating, preferably in chlor-alkali electrolysis cells Graphite parts to be used It is known to use porous materials such as wood, masonry, Graphite or the like against penetration of liquids or gases through impregnation to protect. Examples of this are oils, tars, waxes, paraffin and bitumen suitable. Such substances were asked for, inter alia. also for the impregnation of graphite parts, which are inserted into the gas space of electrolytic cells for chlorine generation, used; However, these impregnating agents fail in the case of graphite parts that are in the The room that contains the hot, chlorine-containing solution.

Es wurde nun gefunden, daß sich eine einwandfreie Dichtung derartiger Graphitteile ergibt, wenn man als Imprägniermittel Pech mit einem Erweichungspunkt oberhalb etwa 8o° verwendet, wie man es beispielsweise aus Braunkohlen- oder Steinkohlenteer gewinnen kann. Derartiges Pech ist sowohl gegen heißes Chlorgas als auch gegen heiße, chlorhaltige Sole beständig und vermal die Poren des Graphits iso vollständig zu schließen"daß, selbst wenn die Sole unter einem Druck von mehreren Metern Wassersäule steht, aus der Zelle oberhalb des Solespiegelis herausragende Graphitteile dicht bleiben. Der Begriff Graphitteile umfaßt hierbei auch die nur graphisierten, geformten Kunstkohlen aus Koks und ähnlichen Stoffen.It has now been found that a proper seal of this type Graphite parts result if pitch with a softening point is used as the impregnating agent used above about 8o °, as it is, for example, from lignite or coal tar can win. Such bad luck is against both hot chlorine gas and hot, Chlorine-containing brine is resistant and completely clogs the pores of the graphite iso conclude "that even if the brine is under a pressure of several meters of water column stands, graphite parts protruding from the cell above the brine level are tight stay. The term graphite parts here also includes those only graphized, shaped Charcoals made from coke and similar materials.

Außer in der Chloralkalielektrolyse können die gemäß der Erfindung imprägnierten Graphitteile .auch allgemein als porenfreie Elemente im chemischen Apparatebau mit Vorteil verwendet werden. Beispiel r Graphitstücke mit einem Porenvolumen von 25 0/0 werden in auf 23o° erhitztes Pech vom Erweichungspunkt r30° getaucht. Durch Verminderung des Luftdrucks im Imprägnierbehälter werden die Poren luftfrei und füllen sich mit Pech. Aus dem beim Erkalten dickflüssig gewordenen Pech werden die Graphitstücke herausgenommen. Die Poren sind dann geschlossen, und die Graphitstücke sind gegen einen Wasserdruck von 3,5 atü vollkommen dicht.In addition to the chlor-alkali electrolysis, the can according to the invention impregnated graphite parts .also generally as non-porous elements can be used with advantage in chemical apparatus engineering. Example r pieces of graphite With a pore volume of 25%, pitch heated to 23o ° has a softening point r30 ° immersed. By reducing the air pressure in the impregnation tank, the Pores free of air and fill with pitch. From what has become thick when cooled Pitch the graphite pieces are taken out. The pores are then closed, and the graphite pieces are completely tight against a water pressure of 3.5 atmospheres.

Beispiel 2 Ein Graphitblock mit einem Porenvolumen von 22°/o wird mit einer Bohrung versehen und auf 3-20° erhitzt. Sodann wird Pech vom Erweichungspunkt ISO biis zgo°, 'das auf 320° erhitzt ist, mit einem Druck von 5 atü in die Bohrung gedrückt. Das Pech verdrängt .die Luft aus den Poren und füllt diese aus. Gegen chlorhaltige Sole von 95' hält idie Imprägnierung auch bei .monatelanger Einwirkung vollständig dicht.Example 2 A graphite block with a pore volume of 22% is provided with a bore and heated to 3-20 °. Then pitch with a softening point ISO to zgo °, which is heated to 320 °, is pressed into the bore with a pressure of 5 atmospheres. The pitch displaces the air from the pores and fills them. The impregnation remains completely impervious to chlorine-containing brine of 95 %, even after months of exposure.

Claims (1)

PATENTANSPRUCH: Verfahren zum Imprägnieren von vorzugsweise in Chloralkalielektrolysezellen zu ver--wendenden Graphitteilen, insbesondere gegen Eindringen von Flüssigkeiten oder Gasen, dadurch gekennzeichnet, daß man Pech vom Erweichungspunkt oberhalb etwa 8o° verwendet.PATENT CLAIM: Process for impregnating, preferably in chlor-alkali electrolysis cells Graphite parts to be used, especially against the ingress of liquids or gases, characterized in that one pitch from the softening point above about 8o ° used.
DEC2183D 1943-05-13 1943-05-13 Process for impregnating graphite parts, which are preferably to be used in chlor-alkali electrolysis cells Expired DE900210C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEC2183D DE900210C (en) 1943-05-13 1943-05-13 Process for impregnating graphite parts, which are preferably to be used in chlor-alkali electrolysis cells

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEC2183D DE900210C (en) 1943-05-13 1943-05-13 Process for impregnating graphite parts, which are preferably to be used in chlor-alkali electrolysis cells

Publications (1)

Publication Number Publication Date
DE900210C true DE900210C (en) 1953-12-21

Family

ID=7012829

Family Applications (1)

Application Number Title Priority Date Filing Date
DEC2183D Expired DE900210C (en) 1943-05-13 1943-05-13 Process for impregnating graphite parts, which are preferably to be used in chlor-alkali electrolysis cells

Country Status (1)

Country Link
DE (1) DE900210C (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1112048B (en) * 1958-05-02 1961-08-03 Hoechst Ag Electrode for the electrolytic decomposition of aqueous hydrochloric acid and process for the production of the electrode
DE1261491B (en) * 1962-03-29 1968-02-22 Knapsack Ag Electrodes for the electrolytic production of manganese dioxide

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1112048B (en) * 1958-05-02 1961-08-03 Hoechst Ag Electrode for the electrolytic decomposition of aqueous hydrochloric acid and process for the production of the electrode
DE1261491B (en) * 1962-03-29 1968-02-22 Knapsack Ag Electrodes for the electrolytic production of manganese dioxide

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