Info

and activity:

where Xj is the mole fraction of component j, g is the liquid-phase activity coefficient of component j, aj is the activity of component j, T is the temperature (K), E is the activation energy (kJ/kmol), and mcat is the catalyst weight (g).

9.2.2 Process Studied

The ETBE reactive distillation column studied by Al-Arfaj and Luyben3 is a double-feed system with pure ethanol fed to stage 6 at the top of the reactive zone and a mixed C4 stream fed to stage 20 at the bottom of the reactive zone. The C4 feed is 40 mol% isobutene and 60 mol% n-butene. The column has 4 stripping trays, 15 reactive trays, and 4 rectifying trays, which are shown in Figure 9.18.

The column operates at 7.5 atm pressure and a reflux ratio of 2.94. The catalyst holdup on the reactive trays is 1000 kg. The bottoms stream contains ETBE with a purity of

I (NSTAGE, NCOMP,

NR,

NRL,

NRV,

T,

TLIQ,

TVAP,

P,

VF,

F,

X,

Y,

IDX,

NBOPST,

KDIAG,

STOIC,

IHLBAS,

HLDLIQ,

TIMLIQ,

IHVBAS,

HLDVAP,

TIMVAP,

NINT,

INT,

NREAL,

REAL,

RATES,

RATEL,

RATEV,

NINTB,

INTB,

NREALB,

REALB,

NIWORK,

IWORK,

NWORK,

WORK)

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