US2342230A - Cloths for electrochemical diaphragms and method of preparing same - Google Patents

Cloths for electrochemical diaphragms and method of preparing same Download PDF

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Publication number
US2342230A
US2342230A US346872A US34687240A US2342230A US 2342230 A US2342230 A US 2342230A US 346872 A US346872 A US 346872A US 34687240 A US34687240 A US 34687240A US 2342230 A US2342230 A US 2342230A
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United States
Prior art keywords
electrochemical
diaphragms
cloths
polyvinyl chloride
chlorinated polyvinyl
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Expired - Lifetime
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US346872A
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Weber Karl
Bode Georg
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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
    • C25B13/00—Diaphragms; Spacing elements
    • C25B13/04—Diaphragms; Spacing elements characterised by the material
    • C25B13/08—Diaphragms; Spacing elements characterised by the material based on organic materials
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S8/00—Bleaching and dyeing; fluid treatment and chemical modification of textiles and fibers
    • Y10S8/01—Silicones

Definitions

  • the present invention relates to cloths for electrochemical diaphragms.
  • felt or tissue of fibers from after-chlorinated polyvinyl chloride possess the desired impermeability which have been impregnated with silicic acid and at least one water-insoluble inorganic salt.
  • Insoluble salts of calcium and barium are particularly suitable for that purpose.
  • the impregnation may, for instance, be produced by saturating the felt or tissue with aqueous solutions of salts of silicic acid and with metal salts,
  • the after-chlorinated polyvinyl chloride is for instance obtained according to the process described in U. S. Patent No. 1,982,765.
  • the cloth is then treated with sulfuric acid of about per cent strength and again dried in the open air: the diaphragm is then ready for use.
  • Filter cloths for electrochemical diaphragms which are tight in the presence of strongly acid electrolytes of an oxidizing action consisting of shrunk felted fibers of after-chlorinated polyvinyl chloride impregnated with silicic acid and at least one water-insoluble salt of a metal of the group consisting of calcium and barium.
  • Filter cloths for electrochemical diaphragms which are tight in the presence of strongly acid electrolytes of an oxidizing action consisting of shrunk felted fibers of after-chlorinated polyvinyl chloride impregnated with silicic acid and barium sulfate.
  • Filter cloths for electrochemical diaphragms which are tight in the presence of strongly acid electrolytes of an oxidizing action consisting of shrunk felted fibers of after-chlorinated polyvinyl chloride impregnated with silicic acid and calcium phosphate.
  • a process for producing filter cloths for electrochemical diaphragms that are tight in strongly acid electrolytes of an oxidizing action which comprises subjecting toshrinkage felted fibers consisting of after-chlorinated polyvinyl chloride and impregnating the shrunk fibers with a water insoluble salt of a metal selected from the class consisting of barium and calcium and with an aqueous solution ofan alkali metal silicate and freeing silicic acid from the silicate by 'ing an anion corresponding to the anion of said water insoluble salt.
  • a process for producing filter cloths and electrochemical diaphragms that are tight in strongly acid electrolytes of an oxidizing action which comprises subjecting to shrinkage fibers consisting of after-chlorinated polyvinyl chloride,

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)

Description

Patented Feb. 22, 1944 ICE CLOTHS FOR ELECTROCHEMICAL DIA- PHRAGMS AND METHOD SAME OF PREPARING Karl Weber and Georg Bode, Gersthofen, near Augsburg, Germany; vested in the Alien Property Custodian No Drawing. Application July 22, 1940, Serial No.
346,872. In Germany July 21, 1939 Claims.
(Granted The present invention relates to cloths for electrochemical diaphragms.
Various processes are already known for using filter cloths which consist of after-chlorinated polyvinyl chloride as diaphragms for electrochemical purposes. It has, however, been found that in the presence of a strongly acid electrolyte of an oxidizing action the tissue is not sufliciently tight so that even after shrinkage of the fiber in hot water of 90 C. the diffusion between the anode liquid and the cathode liquid is not prevented.
Now we have found, and this is surprising, that felt or tissue of fibers from after-chlorinated polyvinyl chloride possess the desired impermeability which have been impregnated with silicic acid and at least one water-insoluble inorganic salt. Insoluble salts of calcium and barium are particularly suitable for that purpose. The impregnation may, for instance, be produced by saturating the felt or tissue with aqueous solutions of salts of silicic acid and with metal salts,
for instance barium salts and after-treating them with dilute sulfuric acid.
The after-chlorinated polyvinyl chloride is for instance obtained according to the process described in U. S. Patent No. 1,982,765.
The following examples serve to illustrate the invention, but they are not intended to limit it thereto, the parts being by weight:
(1) After-chlorinated polyvinyl chloride (for instance felt 300/2) is placed for 2 minutes into hot water of 90 C. After drying the shrinked cloth is coated with an intimate mixture of 2 parts of barium sulfate and 1 part of waterglass (commercial) and allowed to dry in the open air.
The cloth is then treated with sulfuric acid of about per cent strength and again dried in the open air: the diaphragm is then ready for use.
(2) After-chlorinated polyvinyl chloride (for instance felt 300/2) is placed for 2 minutes into 'hot water of 90 C. The shrinked cloth is impregnated with a barium chloride solution which has been saturated in the hot condition. The cloth is then allowed to drop off and treated with dilute sulfuric acid for causing the barium sulfate to precipitate. After drying the cloth is soaked with water-glass and the silicic acid is set free by means of dilute sulfuric acid. After havingbeen dried in the open air the diaphragm is ready for use.
(3) After-chlorinated polyvinyl chloride (for instance felt 300/2) is placed for 2 minutes into hot water of 90 C. The shrinked cloth is impregnated with calcium chloride solution and calcium phosphate is precipitated on the fiber by means of tri-sodium phosphate. The cloth is washed for a short time with water for removinlthosodiumchlcriduitisthenloakedwith under the provisions of sec. 14, act of March 2, 1927; 357 0. G. 5)
commercial waterglass and the silicic acid is set free with phosphoric acid. After having washed it with water and subsequently dried in the opentreating the impregnated cloth with an acid havair the diaphragm is ready for use.
We claim:
1. Filter cloths for electrochemical diaphragms which are tight in the presence of strongly acid electrolytes of an oxidizing action consisting of shrunk felted fibers of after-chlorinated polyvinyl chloride impregnated with silicic acid and at least one water-insoluble salt of a metal of the group consisting of calcium and barium.
2. Filter cloths for electrochemical diaphragms which are tight in the presence of strongly acid electrolytes of an oxidizing action consisting of shrunk felted fibers of after-chlorinated polyvinyl chloride impregnated with silicic acid and barium sulfate. 3. Filter cloths for electrochemical diaphragms which are tight in the presence of strongly acid electrolytes of an oxidizing action consisting of shrunk felted fibers of after-chlorinated polyvinyl chloride impregnated with silicic acid and calcium phosphate.
4. A process for producing filter cloths for electrochemical diaphragms that are tight in strongly acid electrolytes of an oxidizing action which comprises subjecting toshrinkage felted fibers consisting of after-chlorinated polyvinyl chloride and impregnating the shrunk fibers with a water insoluble salt of a metal selected from the class consisting of barium and calcium and with an aqueous solution ofan alkali metal silicate and freeing silicic acid from the silicate by 'ing an anion corresponding to the anion of said water insoluble salt.
5. A process for producing filter cloths and electrochemical diaphragms that are tight in strongly acid electrolytes of an oxidizing action which comprises subjecting to shrinkage fibers consisting of after-chlorinated polyvinyl chloride,
impregnating the shrunk fibers with a water soluble salt of a metal selected from the class consisting of barium and calcium, treating the thus impregnated cloth with an aqueous solution of a compound having an anion adapted to form a water insoluble salt with the aforementioned water soluble salt to thereby produce in said fibers
US346872A 1939-07-21 1940-07-22 Cloths for electrochemical diaphragms and method of preparing same Expired - Lifetime US2342230A (en)

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DE2342230X 1939-07-21

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2667455A (en) * 1949-05-27 1954-01-26 Pyror Ltd Method for electrolytic production of iron from iron sulfate solutions
US2748071A (en) * 1951-08-30 1956-05-29 Technograph Printed Circuits L Apparatus for regeneration of etching media
US3111472A (en) * 1957-08-24 1963-11-19 Zaidan Hojin Noguchi Kenkyu Jo Process of carrying out electrochemically electrolysis

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2667455A (en) * 1949-05-27 1954-01-26 Pyror Ltd Method for electrolytic production of iron from iron sulfate solutions
US2748071A (en) * 1951-08-30 1956-05-29 Technograph Printed Circuits L Apparatus for regeneration of etching media
US3111472A (en) * 1957-08-24 1963-11-19 Zaidan Hojin Noguchi Kenkyu Jo Process of carrying out electrochemically electrolysis

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