There is a lucrative opportunity for selling fuel oil to a local industry. The oil feed...

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There is a lucrative opportunity for selling fuel oil to a local industry. The oil feed that can be converted into fuel oil comprises of a mixture of vacuum gas oil (30 wt%) and vacuum residue (70 wt%). Two different visbreaker designs were investigated for the production of the fuel oil product, namely, a coil visbreaker, and a coil-and-soaker visbreaker. It was found that 10% vacuum residue conversion was possible in a coil visbreaker design with a coil outlet temperature of 472 °C and space time of 2.4 minutes in the coil. 2.1 To use the data for the coil visbreaker for the design of a coil-and-soaker visbreaker that operates at a lower temperature, some assumptions must be made. List the most important assumptions. 2.2 Using the assumptions you have indicated in your answer to question 2.1, calculate what the space time is that is required for a coil-and-soaker visbreaker design with a coil exit temperature of 435 °C and that achieves the same vacuum residue conversion (i.e. 10%). Report your space time in minutes to one decimal place. Under the assumption that conversion for visbreaking lefined in terms of the mass vacuum residue converted, what is the amount of vacuum residue (in wt%) in the liquid product from the visbreaker? 2.4 What is the practical limitation that prevents a visbreaker from achieving high conversion? There is a lucrative opportunity for selling fuel oil to a local industry. The oil feed that can be converted into fuel oil comprises of a mixture of vacuum gas oil (30 wt%) and vacuum residue (70 wt%). Two different visbreaker designs were investigated for the production of the fuel oil product, namely, a coil visbreaker, and a coil-and-soaker visbreaker. It was found that 10% vacuum residue conversion was possible in a coil visbreaker design with a coil outlet temperature of 472 °C and space time of 2.4 minutes in the coil. 2.1 To use the data for the coil visbreaker for the design of a coil-and-soaker visbreaker that operates at a lower temperature, some assumptions must be made. List the most important assumptions. 2.2 Using the assumptions you have indicated in your answer to question 2.1, calculate what the space time is that is required for a coil-and-soaker visbreaker design with a coil exit temperature of 435 °C and that achieves the same vacuum residue conversion (i.e. 10%). Report your space time in minutes to one decimal place. Under the assumption that conversion for visbreaking lefined in terms of the mass vacuum residue converted, what is the amount of vacuum residue (in wt%) in the liquid product from the visbreaker? 2.4 What is the practical limitation that prevents a visbreaker from achieving high conversion?

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21 The most important assumptions to be made for the design of a coilandsoaker visbreaker based on the coil visbreaker data are The same reaction kine... View the full answer