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Ethylene and propylene are valuable monomers. A key step in the recovery of these materials is fractionation of the olefin from the corresponding paraffin (ethane or propane). These fractionation steps require refrigeration of the overhead condenser and very large distillation columns with many stages. Raising the pressure at which the column operates improves the performance of the refrigeration system, but increases the number of stages needed. Formulate the objective function for optimizing the recovery of ethylene from an ethylene-ethane mixture. What are the key constraints? What will be the main trade-offs?
Material which can endures vibrations and saline conditions
Van Laar equation to calculate activity coefficients, How do I use the Van Laar equation to calculate an activity coefficient for an equilibrium ethanol/water binary system with mole fractions of ethanol in liquid of
(1) Determine the mass and the temperature of the steam in an insulated piston-cylinder arrangement if sufficient steam is admitted to displace the piston by one cubic foot. The cylinder originally is empty, and the piston main- tains a constant pres..
Calculate the volume of 0.25 M NaI that would be needed to precipitate all the g2+ion from 45 mL of a 0.10 M Hg(NO3)2 solution according to the following reaction:
Using the concept of a mass balance describe how environmental engineers and scientists model the carbon cycle in the earth's atmosphere allowing them to predict build up of CO2 over time.
Show that the instantaneous frequency of the input FM signals is proportional to the number of zero crossings in the time interval t - (T1/2) to t + (T1/2), divided by T1, Assume that the modulating is essentially constant during this time interva..
The vessel is 4 m internal diameter and 20 m long. Estimate the minimum wall thickness required to resist this pressure, for the cylindrical section and the heads. Take the design pressure as 12 bar and the maximum allowable stress for the materia..
Design a Heat Exchanger for the Following Duty: Reduced crude oil leaving a distillation unit with a flow rate of 3166.04 kL/d at 268 oC and is to be cooled to 243 oC by exchange with 62.8 kg/s pre-flashed crude oil coming from pre-flash unit at 206 ..
Estimate the number-average molecular weight that is required to give a tensile strength of195MPa.
In terms of heat treatment and the development of microstructure, what are two major limitations of the iron-iron carbide phase diagram?
It is common that people are exposed to more than one hazardous substance at a time. The different substances may interact such that one substance may alter the toxicity of one or more of the chemicals present. Discuss the possible interactions th..
Calculate the mass flow rate of distillate and bottom product per hour - the mass flow rate of liquid entering the reboiler and the vapour leaving the reboiler per hour.
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