Solids recovery rate calculation

High Purity and High Recovery Rate are Attainable in One Cycle. In an isothermal operation, experimental results showed that high purity was easily obtainable and tne recovery rate was quite close to those calculated from phase diagrams in many mixtures. For examples, in the initial stage of the experiments, the 80/20 p-,m-xylene mixture was divided into 99% p-form solid and 22-25% p-form liquid without sweating. The recovery rates to the feed reached 70-75%,which were almost the same as the calculated values. 

Each test run in any test programme requires a number of basic calculations depending upon the source of the data. The formulae required are given in Chapter 4. Which calculations are necessary depend upon what instrumentation is installed on the test facility. For instance, if centrate rate is measured then the feed rate needs to be calculated, and if the feed rate is measured then centrate rate has to be calculated. Both these rates are needed to calculate solids recovery, another of the calculations needed. 

For batch filters the time dependency of parameters such as mass of solids, liquids and solutes (both extracted and retained), cake thickness and moisture content and fractional solute recovery can be obtained for the whole cycle, or individual phases where appropriate. The production rates are also given for both products and potential waste streams. In the case of continuous filters throughputs rather than masses are calculated. 

When flocculants are used the polymer dosage level has to be calculated. On special applications unique calculations will need to be performed. In three-phase work the mass balance needed to work out centrate rates is more complex. Oil recoveries and losses will need to be assessed. With three mass balances, solids, oil and water, some imbalance is to be expected due to experimental error, and care is needed to ensure that these errors are not allowed to affect the reliability of the result. 

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