Versión en Español
Control the Reaction of Chlorine and Caustic Soda When Manufacturing Sodium Hypochlorite
with ORP Electrodes
The reaction of chlorine and caustic soda that results in the manufacture of sodium
hypochlorite must be controlled to ensure that the end product - bleach -
is of the desired excess caustic level. The batch end point is critical because
a finished bleach that contains high excess caustic may result in slower bleaching
speed and inefficient use of raw materials. Conversely, an over-chlorinated product
may be seriously unstable and may result in a hazardous release.
The preferred way to monitor the reaction is by Oxidation Reduction Potential -
commonly referred to as ORP. The use of ORP is a simple and accurate way to maximize
the use of raw materials to produce a product with maximum stability and improved
bleaching speed.
The standard Powell Hypo
Batch Controller uses the principle of ORP to monitor the caustic remaining
in the batch system.
ORP electrodes, when placed in a bleach solution, produce a voltage inversely proportional
to the amount of excess caustic in the solution. Given the same amount of excess
caustic, the electrodes will consistently produce the same voltage. This allows
the bleach producer to establish a given set point on the controller that yields
bleach with a consistent excess caustic end point.
Oxidation-Reduction Potential Electrodes - Years of Proven Service
- Kynar® electrode holder designed to fit between companion flanges.
- Kynar® electrode body.
- PVC moisture-resistant dust caps.
- No electrolyte solution.
- Direct in-line usage.
- Optional electrode holders for other applications