Electrochemical cell

Inactive Publication Date: 2014-09-04
COMPUR MONITORS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0006]Thus it is an object of the invention to provide an electrochemical cell which makes a reliable hydrogen cyanide gas generation with a long l

Problems solved by technology

Besides the fact that the use of such a gas generator is only possible under laboratory conditions, this gas generator is unfavorable in particular due to the electrolyte which is an aqueous solution.
Thus in practical applications for e

Method used

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Embodiment Construction

[0015]The present invention and preferred embodiments will be discussed below further with reference to the single drawing schematically showing an electrochemical cell according to the present invention.

[0016]An electrochemical cell 1 comprises a cell housing or container 2 at its bottom side above of which a counter electrode 3 is disposed on which ionic liquid 4 is provided. A generator electrode 5 is disposed on the side of the ionic liquid opposing the counter electrode 3. The generator electrode 5 acting as an anode and the counter electrode 3 acting as a cathode are connected to a constant current source 6.

[0017]On the outer side of generator electrode 5, which is formed for example as a wire mesh or as a gas diffusion membrane, another gas diffusion membrane is possibly provided, through which the generated hydrogen cyanide by diffusion passes out of the cell to the outside. The gas diffusion membrane 7 is additionally stabilized by a PTFE support grid 8.

[0018]The interior o...

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Abstract

An electrochemical cell is described, which provides a reliable gas generation even under unfavorable environmental conditions and with significant changes in temperature and environment. Furthermore the cell has a long life time. The electrolyte of this electrochemical cell comprises at least one ionic liquid containing thiocyanate ions for the generation of hydrogen cyanide gas. Preferred substances for the composition of the electrolyte and for the provision of thiocyanate ions in the electrolyte are specified.

Description

FIELD OF THE INVENTION[0001]The present invention relates to an electrochemical cell for generating hydrogen cyanide gas using a generator electrode and a counter electrode.BACKGROUND OF THE INVENTION[0002]Electrochemical cells for generating test gases for gas analysis devices are known, e.g. from German patent specification 26 21 677, for various gases, but not for hydrogen cyanide gas.[0003]From document Z. Tocksteinová, F. Opekar, “The Electrochemical Generation of Small Amounts of Hydrogen Cyanide”, Talanta, 1986, vol. 33, no. 8, pages 688-690 a method for generating hydrogen cyanide gas using an electrochemical cell is known, wherein hydrogen cyanide gas is generated by oxidation of thiocyanate ions. The gas is generated via controlled oxidation of thiocyanate in aqueous solution according to reactionSCN−+4 H2O→6 e−+SO42−+HCN+7 H+[0004]A platinum electrode completely submerged in an aqueous electrolyte is flushed by nitrogen, so as to transport the generated hydrogen cyanide g...

Claims

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Application Information

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IPC IPC(8): C25B9/06C25B1/22C25B9/17
CPCC25B1/22C25B9/06C25B1/00C25B9/17G01N27/4163G01N33/0006G01N33/007G01N2033/0072
Inventor FREY, CHRISTOPHER
Owner COMPUR MONITORS
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