Sulphur flowrate

Sulphuric acid is pumped at 3 kg/s through a 60 m length of smooth 25 mm pipe. Calculate the drop in pressure. If the pressure drop falls by one half, what will be the new flowrate ... 

Ethyl formate is to be produced from ethanol and formic acid in a continuous flow tubular reactor operated at a constant temperature of 303 K (30°C). The reactants will be fed to the reactor in the proportions 1 mole HCOOH 5 moles C2H5OH at a combined flowrate of 0.0002 m3/s (0.72 m3/h). The reaction will be catalysed by a small amount of sulphuric acid. At the temperature, mole ratio, and catalyst concentration to be used, the rate equation determined from small-scale batch experiments has been found to be ... 

A shell and tube heat exchanger is to be used to cool 100kgs of 98% sulphuric acid from 60°C to 40°C. Cooling water is available at 10°C and a flowrate of 50 kg s . The overall heat transfer coefficient is 500 W m " K . Determine the required surface area for (a) countercurrent and (b) cocurrent flow. Assume that the heat transfer coefficient is the same in both cases. (Heat capacities water, 4200Jkg K 98% sulphuric acid, 1500Jkg K" .)... 

Calculate the Reynolds number for each of the following flows and so determine whether the flow is streamline or turbulent. Four fluids (air, carbon dioxide, water and sulphuric acid) are to be considered for the flowrates given and for both a 15 mm pipe and a 150 mm pipe. 

Ballestra do not preheat the furnace but electrically ignite the sulphur flow to the fiimace. It is important to follow exactly the recommended operating procedure and particularly to ensure that the electric elements are (kawing the specified current and the supplementary combustion air is at the correct pressure and flowrate (small rotameter). On start-up die temperature of the fiimace rises to the auto-ignition temperature of sulphur in approximately 3-5 minutes at which point the ignition procedure can be terminated. 

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