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By Petrakis L., Weiss F.T. (eds.)

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Methanol-to-Gasoline Process 37 process was producing about 5 wt% at that time. To meet t h i s s p e c i f i c a t i o n w i t h conventional processing would have required undercutting the g a s o l i n e product. Consequently, an e x p l o r a t o r y program was undertaken t o see i f t h i s s p e c i f i c a t i o n could be met by a d d i t i o n of a simple g a s o l i n e t r e a t i n g step. I n a short time, a heavy g a s o l i n e t r e a t i n g (HGT) technology evolved. With the HGT, durene l e v e l s even higher than 5 wt% could be t r e a t e d down t o the 2% l e v e l .

ROWE Fluidized-Bed Reactors 55 upward v e l o c i t y through the empty space of the bubble of s i m i l a r magnitude to minimum f l u i d i s a t i o n v e l o c i t y . With f i n e p a r t i c l e s t h i s i s small so that l i t t l e c i r c u l a t i o n occurs during the r e s i dence time of a bubble i n the bed. This i s the very s i t u a t i o n where the cloud cannot penetrate f a r i n t o the dense phase so the o v e r a l l e f f e c t i s poor c o n t a c t i n g o f bubble phase gas w i t h p a r t icles.

To ensure that there would be no d r i v e a b i l i t y or handling problems w i t h MTG g a s o l i n e , a t a r g e t of 2 wt% durene i n g a s o l i n e was set as the company s p e c i f i c a t i o n , though the MTG 2. PENICK E T A L . Methanol-to-Gasoline Process Table I . ch002 Conditions Methanol/Water Chg. (W/W) Conversion Reactor I n l e t Temperature (°C) Conversion Reactor O u t l e t Temperature (°C) Methanol Space V e l o c i t y (WHSV) Separator Temperature (°C) Recycle R a t i o (mol/mol chg) Pressure (kPa) 83/17 83/17 358 360 404 1.

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