US698696A - Process of making paris-green. - Google Patents

Process of making paris-green. Download PDF

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US698696A
US698696A US7234801A US1901072348A US698696A US 698696 A US698696 A US 698696A US 7234801 A US7234801 A US 7234801A US 1901072348 A US1901072348 A US 1901072348A US 698696 A US698696 A US 698696A
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green
paris
making
acetate
copper
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US7234801A
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Richard Franchot
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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
    • C25B3/00—Electrolytic production of organic compounds
    • C25B3/20—Processes
    • C25B3/23—Oxidation

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  • This invention relates to a process of making paris-green from metallic copper by electrolysis.
  • the invention consists, essentially, in sub-v preferably use an anode consisting of a thick plate of copper and a cathode which may be only a thin sheet of copper, these being immersed in the solution.
  • the cathode is surrounded by a linen bag as a ⁇ convenient means of preventing the cathode products mixing with the electrolyte, this bag being iilled with a solution of acetic acid or a metallic acetate free from arsenic.
  • the hydrogen formed in the process thus passes into the atmosphere Without coming in contact in its nascent state with the arsenic in the electrolyte, which would cause the formation of metallic arsenic and arseniureted hydrogen.
  • the electrolyte is agitated during this process.
  • the process is practically continuous.
  • the paris-green is filtered or settled out of the solution, and from time to time fresh arsenious oxid and acetic acid or metallic acetate is added to the solution.
  • the cathodebag is emptied periodically, as necessitated by the accumulation of products therein, and lled with fresh acetic acid or metallic acetate solution.
  • the cathode products in the Serial No. 72,348. (No specimens.)
  • vbag will in general consist of hydrogen gas and the hydrate of the metal contained in the acetate used.
  • the cathode product is hydrate of lime.
  • My invention provides a very economical and convenient electrolytic method of prod ucing paris-green having many advantages over the electrolytic processes now in use, of which the following are especially important.
  • the paris-green is produced directly.
  • Acetate of lime may be used as the raW material, which is very cheap.
  • economy of my process over chemical processes is secured by the use of metallic copper instead of sulfate of copper and the avoidance of the use of soda. The production of the dangerous arsenic or arseniureted hydrogen is avoided.
  • paris-green which consists in passing an electric current through a solution of an acetate and arsenious oxid with a copper anode and with the cathode immersed in asolution of acetate and inclosed to prevent the cathode products mixingvwith the arsenious oXid of the electrolyte.

Description

No. 698,696. Patented Apr. '29, |902. B. FRANCHUT.
PROCESS 0F MAKING PARIS GREEN.
\ (Application led Aug. 17, 1901.)
(No Modem 1n: NsRPxS PETER: w.. PHoro-umo.. wAsH'NuToN, n, cy
UNITED STATES PATENT QEEICE.
RICHARD FRANCHOT, OF NIAGARA FALLS, NEV YORK.
PROCESS OF MAKING PARIS-GREEN.
SPECIFICATION forming part of Letters Patent No. 698,696, dated April 29, 1902.
Application tiled August 17, 1901- To a/ZZ whom, t may con/cern.-
Be it known that I, RICHARD FRANoHo'r, a citizen of the United States, residing at Niagara Falls, county of Niagara, and'State of New York, have invented certain new and useful Improvements in Processes of Making Paris-Green, fully described and represented in the following specification and the accompanying drawing, forming a part of the same.
This invention relates to a process of making paris-green from metallic copper by electrolysis.
The invention consists, essentially, in sub-v preferably use an anode consisting of a thick plate of copper and a cathode which may be only a thin sheet of copper, these being immersed in the solution. The cathode is surrounded by a linen bag as a `convenient means of preventing the cathode products mixing with the electrolyte, this bag being iilled with a solution of acetic acid or a metallic acetate free from arsenic. The hydrogen formed in the process thus passes into the atmosphere Without coming in contact in its nascent state with the arsenic in the electrolyte, which would cause the formation of metallic arsenic and arseniureted hydrogen.
The electrolyte is agitated during this process. The process is practically continuous. The paris-green is filtered or settled out of the solution, and from time to time fresh arsenious oxid and acetic acid or metallic acetate is added to the solution. The cathodebag is emptied periodically, as necessitated by the accumulation of products therein, and lled with fresh acetic acid or metallic acetate solution. The cathode products in the Serial No. 72,348. (No specimens.)
vbag will in general consist of hydrogen gas and the hydrate of the metal contained in the acetate used. Thus if acetate of lime is used in the electrolyte the cathode product is hydrate of lime.
In the accompanying drawing I have shown in diagrammatic vertical section a simple apparatus for carrying out .my process, in Which- A is the cell; ct, the copper-plate anode; b, the copper cathode inclosed in the bag c, and CZ the electrolyte. A mechanical stirrer e is shown, actuated by the shaft f. Of course hand agitation may be used.
My invention provides a very economical and convenient electrolytic method of prod ucing paris-green having many advantages over the electrolytic processes now in use, of which the following are especially important. The paris-green is produced directly. Acetate of lime may be used as the raW material, which is very cheap. Of course economy of my process over chemical processes is secured by the use of metallic copper instead of sulfate of copper and the avoidance of the use of soda. The production of the dangerous arsenic or arseniureted hydrogen is avoided.
l. The process of makingparis-green,which consists in electrolyzing with a copper anode a solution of an acetate and arsenious oxid.
2; The process of making paris-green,which consists in passing an electric current through a solution of an acetate and arsenious oxid with a copper anode and with the cathode immersed in asolution of acetate and inclosed to prevent the cathode products mixingvwith the arsenious oXid of the electrolyte.
In testimony whereof I have hereunto set my hand in the presence oftwo subscribing Witnesses. j
RICHARD FRANCHOT.
Witnessest WILLIAM H. RAY,
II. W. KELLOGG.
US7234801A 1901-08-17 1901-08-17 Process of making paris-green. Expired - Lifetime US698696A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2608530A (en) * 1945-03-24 1952-08-26 Kahn Milton Electrodeposition of metal salts
US2767135A (en) * 1951-01-23 1956-10-16 Ionics Electrolytic transfer of salts

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2608530A (en) * 1945-03-24 1952-08-26 Kahn Milton Electrodeposition of metal salts
US2767135A (en) * 1951-01-23 1956-10-16 Ionics Electrolytic transfer of salts

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