I will pay for the following article ContinuousStirred Tank Reactors. The work is to be 8 pages with three to five sources, with in-text citations and a reference page. In this experiment, no chemical reaction takes place. The residence time behavior of a dissolved salt through a cascade of three continuous stirred tanks is examined at different flowrates for a constant starting concentration of salt. The experimentally determined variation of slat concentration with time in each tank is compared with results predicted from theoretical equations, allowing deviations from ideal behavior to be observed. Conversion of reactant is then estimated by graphical integration for both the experimental results and theoretical data. The general effects of the transient concentration of reactants are similar to those induced in a chemical reactor, subject to variation in throughput.
1. Three equal-sized Perspex tanks with provision for overflow from tank 1 to tank 2 then to tank 3, and for the overflow from the drain. Each tank measures 152mm by 254mm deep with the overflow weirs being placed 228mm from the base. The tanks are stirred by propellers driven by the same drive motor. A rotameter controls the feed to tank 1.
2. A portable conductivity meter is available to measure the conductivity of the solution in each tank. It has four scales, which can be adjusted to give a reading in the desired range. For dilute solutions, conductivity is approximately proportional to salt concentration. The units on the meter must be checked.
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1. Fill the tanks with cold water directly from the tap initially, and then through the rotameter unit all tanks are full and flowing freely down the cascade. Stop the water flow and remove half of the water from the first tank. Place 50g of sodium chloride in a 500ml beaker, add some cold water and stir with a glass rod to dissolve the salt. Pour the solution into the first tank and start the stirrers to mix completely.
2. Start the water flow at 1.0 liter per min into the first tank using the rotameter (range 0.2 to 3.4 L/min). The water levels in each tank will automatically adjust until the flow in .and out of each tank is the same.
3. The test starts when the water starts to overflow from tank 1 to tank 2. Start the clock at this point and take conductivity readings in each tank at various time intervals, e.g. every 1 or 2 minutes, so that graphs of conductivity in each tank can be drawn as a function of time. The solution conductivity is measured by dipping the probe into the tank and allowing a few seconds before taking a reading. It is not necessary to wash the probe between readings. Also, it is not necessary to sample all tanks at exactly the same time provided that the correct time is recorded for each reading.
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