Friday, September 7, 2018

Executive summary

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In this project we made a PFD (process flow diagram) for the manufacture of benzene via the thermal dealkylation of tuluence. Hydrogen reacts with toluene at high temperature to form benzene and methane according to the stoichiometry


All simulations were done by using the process simulator software ChemCad. All the data needed for simulation were obtained from Table 18.1, which represents the input properties of the equipments and Table 18., which represents the feed stream properties as well an estimation of recycle streams. The results of simulation of pressures, temperatures and flows in, were then compared with those given in Table 1.7 on chapter one. To avoid any complexity when designing the flow sheet, each equipment examined and ran separately and making sure it converges with no errors. Then gradually more equipment added to complete the process design sheet. Some of the results were not corresponding one-to-one with actual results in Table 1.7, so a trails and errors were done to reach the desire values especially with the mixers and splitters. For the first part of the project, we had multi options for the kind of reactor and tower to choose from. We picked stoichiometric reactor for its simple design and parameters availability. We also preferred to use a short tower with partial condenser because not all the hydrogen and methane can be separated from the aromatics in the flash drum. Therefore we remove most of the remaining amount in a distillation column with a partial condenser where we have more control over the pressure which will prevent from contaminating our benzene product. The tower was build with an approximation of .4 trays.


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