Electrolysis cell diaphragm reclamation

Details Electrolysis cell diaphragm reclamation Electrolysis cell diaphragm reclamation

C - Chemistry, Metallurgy

23

F

C23F 1/16 (2006.01) B01D 65/06 (2006.01) C25B 1/46 (2006.01) C25B 11/00 (2006.01) C25B 15/00 (2006.01)

Patent

CA 2152968

There is now disclosed a method of restoring a used article utilized in electrolysis, such as in a chlor-alkali cell. The used article is usually the cell diaphragm, but may be a cell electrode, particularly when it is in assembly with the cell diaphragm. The restoration method involves treating the article, typically in place in the cell, but which may be removed from the cell by soaking in a treating composition containing most always hydrochloric acid and corrosion inhibitor. The article after treatment may be baked at elevated temperature. When baking is utilized it can come before soaking. With or without baking, the article may or may not be involved in a wetting step. Where the restoration involves an article utilized in a chlor-alkali cell, the restoration can readily reduce the problem of hydrogen in the chlorine product produced. Such treatment can also lead to reduced cell voltage as well as reduced cell anolyte level.

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