6. The manufacture of such products as penicillin, tetracycline, vitamins, and other pharmaceuticals, as well as photographic chemicals, dyes, and other fine organic compounds, usually requires separating the suspended solids from their mother liquid by centrifugation, and then drying the wet cake. A closed-loop system (figure) for centrifuge unloading, drying, conveying, and solvent recovery is comprised of equipment especially designed for handling materials requiring sterile and contamination-free conditions.
Given the experimental measurements on the pilot plant equipment outline in figure:
a. Draw and label a flowchart of the process.
b. What is the lb/hr of the recycle stream R?
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- During flour milling, wheat grains are taken at a rate of 4 t/h and goes to the cleaning system. As a result of cleaning, 2% is removed in the form of foreign material and chaff. The cleaned grain is then tempered (moisture adjusted from initial to higher moisture to make the bran layer rubbery) before they pass through roller breaks. If the initial moisture content of of the grain is 13.2%, determine the weight of tempered grains if the tempering moisture is 14.5%. Determine the amount of water adsorbed during tempering per tonne of tempered grain. (Moistures are given in wet basis). Also, determine the amount of foreign material/chaff generated per tonne of tempered grain.arrow_forwardCalculate using the data below the % ash of the sample (dry basis). Weight of sample before drying: 12.6758 g Weight of the sample after drying: 9.5672 g Weight of the sample after ashing: 1.9875 g Round off to 4 decimal places and do not include units.arrow_forwardDeterioration must be strictly avoided when drying pharmaceutical products. Furthermore, such products are often produced from a nonaqueous solvent such as ethanol, methanol, acetone, etc. Explain why a closed-cycle spray dryer using nitrogen is frequently a good choice of dryerarrow_forward
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