BRINE PURIFICATION

INTRODUCTION

Most of the chlorine produced in the world is manufactured by electrolysis of sodium chloride brine (NaCl). The most commonly used electrolysis processes are the diaphragm cell, the membrane cell, and the mercury cell. In all three processes, the feed brine solution to the cell must be totally free of contaminants commonly found in the salt and water supplies. This purification is accomplished through the use of a filter or a bank of filters.

APPLICATION

The contaminants are removed by adjusting the pH of the brine solution and using chemicals to force the impurities to precipitate out of solution. In the brine purification process, there is a need to detect these precipitated impurities, which are not removed by the settling and filtering stages. These impurities are made up of minerals, metals and organics. If the contaminants are allowed to enter the electrolysis stage, they will coat the cells and reduce their efficiency.

SOLUTION

The Monitek suspended solids monitor will continuously check the brine solution and will immediately detect the presence of solids that have failed to be removed. The Monitek unit warns the operator of the smallest quantities of contaminants and enables him to take immediate action to protect the cells before they become damaged. The same holds true for any pumps or valves upstream of the cell. These contaminants are usually due to filter breakthrough. The Monitek unit can trigger the recycling of the unclear filtrate and advise the operators to adjust the less-than-efficient filter.

ADDITIONAL COMMENTS

Brine solutions are typically abrasive to stainless steel, therefore we recommend Halar coating for the sensor or other compatible material ie. Hastelloy C, titaniu

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