By Stanley M Walas
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Additional info for Chemical process equipment : selection and design
Rather less freedom is allowed in the construction of mechanical flowsheets. The relative elevations and sizes of equipment are preserved as much as possible, but all pumps usually are shown at the same level near the bottom of the drawing. Tabulations of instrumentation symbols or of control valve sizes or of relief valve sues also often appear on P&I diagrams. Engineering offices have elaborate checklists of information that should be included on the flowsheet, but such information is beyond the scope here.
2 shows that 10 analyzers are used for control of ethylene composition in this plant within the purities shown. High speed on-line gas chromatographs have analysis times of 30- 120 sec and are capable of measuring several components simultaneously with a sensitivity in the parts/million range. Mass spectrometers are faster, more stable, and easier to maintain but are not sensitive in the ppm range. Any one instrument can be hooked up to a halfdozen or so sample ports, but, of course, at the expense of time lag for controller response.
RECOVERY OF ISOPRENE Draw carefully a flowsheet for the recovery of isoprene from a mixture of C, hydrocarbons by extractive distillation with aqueous acetonitrile according to the following description. 12. AIR SEPARATION A hydrocarbon stream containing 60 mol % isoprene is charged at the rate of 1 0 , W p p h to the main fractionator D-1 at tray 40 from the top. The solvent is acetonitrile with 10 wt % water; it is charged at the rate of 70,000pph on tray 11 of D-1. This column has a total of 70 trays, operates at 1Opsig and 100°F at the top and about 220°F at the bottom.
Chemical process equipment : selection and design by Stanley M Walas