Chemical process equipment: selection and design by Stanley M. Walas

By Stanley M. Walas

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Noel, Petroleum Refinery Manual, Reinhold, New York, 1959. 18. Peters and Timmerhaus, Plant Design and Economics for Chemical Engineers, McGraw-Hill, New York, 1980. 19. Rase and Barrow, Project Engineering of Process Plants, Wiley, New York, 1957. u). Resnick, Process Analysis and Design for Chemical Engineers, McGraw-Hill, New York, 1981. 21. Rudd and Watson, Strategy of Process Engineering, Wiley, New York, 1968. 22. ), Handbook of Separation Processes for Chemical Engineers, McGraw-Hill, New York, 1979.

3. 4. 5. 6. 7. 8. 1. VISBREAKER OPERATION Visbreaking is a mild thermal pyrolysis of heavy petroleum fractions whose object is to reduce fuel production in a refinery and to make some gasoline. 2API and 700°F is supplied from beyond the battery limits to a surge drum F-1. From there it is pumped with J-lA&B to parallel furnaces B-lA&B from which it comes out at 890°F and 200 psig. Each of the split streams enters at the bottom of its own evaporator T-lA&B that has five trays. Overheads from the evaporators combine and enter at the bottom of a 30-tray fractionator T-2.

Construct a flowsheet for the process according to the following description. The crude C, mixture is charged to a 70 tray extractive distillation column T-1 that employs acetonitrile as solvent. Trays are numbered from the bottom. Feed enters on tray 20, solvent enters on tray 60, and reflux is returned to the top tray. Net overhead product goes beyond the battery limits. Butadiene dissolved in acetonitrile leaves at the bottom. This stream is pumped to a 25-tray solvent recovery column T-2 which it enters on tray 20.

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