Overview
ABSTRACT
There are two types of processes for producing sodium hypochlorite that are developed industrially: chemical and electrochemical. The chemical processes, presented here, consist of soda chlorination using chlorine gas. The standard process produces 13% active chlorine bleach. The “Haut Titre” process, patented by Arkema, causes chlorine to react with a 50% soda solution to produce 24–26% active chlorine bleach.
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Jean-Christophe MILLET: Process Manager. Chlorochemical Division - Arkema
INTRODUCTION
There are two types of industrially developed processes for obtaining sodium hypochlorite:
the chemical process that is the main subject of this text;
The electrochemical process in which a sodium chloride solution (brine or seawater) feeds electrolysers with or without separators, generating chlorine at the anode and producing soda at the cathode. Hypochlorite is obtained in situ in the case of electrolyzers without separators; otherwise, the two reagents are mixed in a specific reactor. This process is characterized by the production of solutions diluted to less than 10 g/l of active chlorine.
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Sodium hypochlorite NaClO
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