Liquid chemical feed dilution calculators

These types of liquid chemical feed systems use a second tank (dilution tank). Bulk storage tanks may be distant from the chemical feed pump location, there may be concerns about safety of the bulk chemical, or it may be necessary to dilute the chemical for accurate feed or to aid in mixing with process water. Whatever the reason, feed calculations are the same as those given for chemical feed of solutions calculators (c8-10 through c8-13). The only difference is that the percent solution strength is less than for bulk chemicals. 

Design a two-phase gas-liquid CSTR for the chlorination of benzene at 55°C by calculating the total volume that corresponds to an operating point where r/X = 500 on the horizontal axis of the CSTR performance curve in Figure 24-1. The time constant for convective mass transfer in the liquid phase is r. The time constant for second-order irreversible chemical reaction in the liquid phase is If the liquid benzene feed stream is diluted with an inert, then 7 increases. The liquid-phase volumetric flow rate is 5 gal/min. The inlet molar flow rate ratio of chlorine gas to liquid benzene... 

Some liquid chemicals are fed directly from the storage tank to the process water without any dilution. The chemicals may be delivered already diluted or may be 100 percent strength. Calculating the chemical feed rate requires knowing the process water flow rate, the applied dosage, and the solution strength. 

Calculators 8-1 and 8-2 (identical to dry feed calculators 6-1 and 6-2) can be used to determine the feed rate of pure chemical for a given dosage and flow rate. These are often used for liquid polymers (polyelectrolytes) where the polymer in the delivery drum is fed directly to the point of application without dilution. 

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