Process for reclaiming a contaminated electrolyte from an electrolytic cell used in the production of gaseous fluorine

A technology of electrolyte and electrolytic cell, applied in the direction of electrolytic components, electrolytic process, etc., can solve the problems of performance deterioration, contaminated electrolyte, etc.

Inactive Publication Date: 2009-11-04
HONEYWELL INT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At 2%, performance deteriorates to the point where the electrolyte is usually discarded and the cell is replenished with new electrolyte
Another issue is the disposal of contaminated electrolyte

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0009] The electrolyte mainly consists of the components potassium bifluoride and / or hydrofluoric acid. Potassium bifluoride typically comprises from about 58 to about 62 weight percent, more typically from about 59 to about 61 weight percent. Hydrofluoric acid typically comprises from about 38 to about 42% by weight and more typically from about 39 to about 41% by weight.

[0010] Over time and use, the electrolyte (melt) of the electrolytic cell becomes contaminated with metal ions. Metal ions typically originate from corrosion of the electrolytic cell body, electrolytic cell head, other metal parts, and other metal contacting surfaces within the electrolytic cell. The ions can be from any contact metal in the electrolytic cell, including iron, nickel and manganese. Iron ions are the most common. The metal ions dissolve in the melt.

[0011] To recover contaminated electrolyte, the electrolyte is removed (ie, extracted) from the electrolytic cell to a separate treatment ...

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Abstract

A process for reclaiming a contaminated electrolyte in an electrolytic cell used in the production of gaseous fluorine. The contaminated electrolyte is a mixture of potassium bifluoride and hydrofluoric acid having metal ions therein. The process has the following steps: a) removing the contaminated electrolyte from the cell to a treatment tank; b) adding a lithium compound to the contaminated electrolyte in the treatment tank to induce settlement of at least part of the metal ions; c) allowing the metal ions to settle to the bottom of the treatment tank; d) removing the settled metal ions from the bottom of the treatment tank to form a reclaimed electrolyte; and e) returning the reclaimed electrolyte to the cell.

Description

technical field [0001] The present invention relates to a method of reclaiming electrolyte from electrolytic cells used for the production of gaseous fluorine. Background technique [0002] Gaseous fluorine (F 2 ) is produced by hydrofluoric acid (HF) cracking (hydrogen (H 2 ) as another product). The lysis takes place in the electrolytic cell. Each electrolytic cell typically contains potassium bifluoride (KHF 2 ) and HF mixture, often referred to as "melt (melt)". Electricity is passed through the liquid electrolyte to generate products. [0003] During cell operation, metal components in the cell body and head corrode over time to form ions that dissolve and / or become suspended in the melt. The most common is iron ions. When the metal ion content in the electrolyte reaches about 1% by weight (based on the total weight of the electrolyte), the performance of the electrolytic cell begins to deteriorate. At 2%, performance deteriorates to the point where the electrol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B15/08C25B1/24
CPCC25B15/08C25B1/245
Inventor P·G·埃克瓦格J·B·普赖斯D·克雷格S·罗宾逊K·C·贝克曼A·格林威尔R·特拉维斯
Owner HONEYWELL INT INC
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