Sodium Chlorite Feed Calculators

The feed rate of chlorine and sodium chlorite is linked to the feed of chlorine dioxide because these are the primary chemicals used in most generation systems. The most common sources of chlorine are compressed gas and liquid sodium hypochlorite (12 percent trade is a common solution strength). Sodium chlorite is commonly used as a solid (about 65 percent sodium chlorite) and as a 25 percent strength solution. 

The chemical reaction of sodium chlorite (NaC102) and chlorine (CI2) to produce chlorine dioxide (CIO2) and salt (NaCl) is given in the equation below. 

This equation results in the following weight relationship, where g is equal to grams. 

Expressing the weight relationship in this way allows the sodium chlorite consumption to he calculated for any concentration or for any chlorine dioxide production amount. Also, any weight units can he used as long as all the units used are identical. 

This relationship can he further expanded hy substituting the equation for chlorine dioxide feed shown in calculators c4-12 and c4-13. Thus, we have the basic relationship (c4-14) that is useful in calculating the sodium chlorite of any concentration needed to produce a given amount of chlorine dioxide. Remember, these relationships are drawn from the chemical equations, thus 100 percent efficiency is assumed. Lower efficiency therefore results in amounts that differ from these calculated values. However, the calculated values are useful to estimate chemical use, and these can be used to evaluate generator efficiency (see A Generator Purity Calculation, p. 53). 

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