Diethyl ether (DEE) is a colorless, highly volatile, flammable liquid with a characteristic odor. It is an important sol

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Diethyl Ether Dee Is A Colorless Highly Volatile Flammable Liquid With A Characteristic Odor It Is An Important Sol 1 (38.32 KiB) Viewed 76 times

Diethyl ether (DEE) is a colorless, highly volatile, flammable liquid with a characteristic odor. It is an important solvent in the production of cellulose acetate and other cellulose-based polymers.We have an excess of ethanol in our facility. Therefore, the process of interest in this assignment uses the vapor-phase dehydration of ethanol. A process to manufacture 80,000 metric tons/year of a liquid containing at least 99.5 mol % DEE is proposed. The fresh feed to the unit, Stream 1, consists of 70 mol % ethanol in water. This stream is pumped from storage and sent to an on-site feed vessel, V-1201, where it is mixed with recycled ethanol, Stream 8. The stream leaving V-1201, Stream 2, reacted in the reactor, R-1201. The reactor contains a packed bed of alumina catalyst. The main reaction is: 2C₂H5OH = (C₂H5)2 O + H₂O (1) The only side reaction that occurs in R-1201 is the dehydration of DEE to form ethylene: (C2H5)2 0 = H₂O + 2 C2H4 The reactor effluent, Stream 3, contains ethylene, unreacted ethanol, DEE, and water. Stream 3 is fed to a flash vessel, where it may be assumed that all ethylene enters Stream 4, while all other components enter Stream 5. The contents of Stream 4 have no value. Stream 5 is sent to a distillation column, T-1201, where at least 99% of the DEE is recovered as product in Stream 6 at 99.5% purity, and it may be assumed that all of the waters enter Stream 7. In T-1202, all of the DEE enters the recycle stream, Stream 8, and that the composition of Stream 8 is 95 wt% ethanol in water, if the DEE is ignored. The waste water stream, Stream 9, my contain no more than 1 wt% ethanol. 1. Draw the concept diagram for the above process ii. Draw by hand a neat PFD and suggest any possible energy recovery.