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Two-phase upflow fixed-bed reactors

In spite of the extensive studies on the gas-liquid mass transfer in two-phase upflow fixed-bed reactors, summarized by Shah [27], Ramachandran and Chaudhari [64], Gianetto and Silveston [65], and Molga and Westerterp [62], only few correlations are reported in the Uterature to evaluate gas-Uquid mass transfer parameters under low and high pressure conditions [59, 66]. [Pg.105]

In two-phase downflow and upflow fixed-bed reactors, gas-liquid mass transfer resistance can be detrimental to the overall reactor performance [14, 32]. Therefore, accurate estimation of gas-liquid mass transfer parameters is important for achieving successful reactor design or scale-up. The overall gas-liquid mass transfer coefficient may be expressed, according to the two-film concept, in terms of the liquid-side and the gas-side mass transfer coefficients ... [Pg.105]

Whereas in a fixed bed reactor with a single fluid phase there exist only two modes of operation, either downflow (which is used in most cases) or upflow, and only two different flow regimes, either laminar or turbulent flow, which can be observed and characterized by a Reynolds number as the single relevant dimensionless group, the fluiddynamics in multiphase catalytic fixed bed reactors are much more complex. [Pg.749]

Standard two-fluid models for two-phase downflow and upflow in three-phase fixed-bed reactors... [Pg.100]

To provide an illustration, the flow sheet of the IFP process shown in Fig. 3.12 comprises two possible variants. The simpler corresponds to the direct use of the etherified solution in the gasoline pool, without separating e excess methanol contained. Operations are conducted with two reactors in series the first with an upflow stream and expanded bed with recycle of part of the previously cooled effluent for better control of the temperature rise, and the second with a downflow stream and a fixed bed. The more complex involves the recovery of excess methanol, first by azeotropic distillation in a depentanizer with part of the unconverted hydrocarbons, and then by water washing of this raffinate. The hydrocarbon phase is added to the bottom of the depentanizer. The water/methanol mixture is distilled to recover and recycle the alcohol to the etherification staee. [Pg.234]

FIGURE 3.5 Processes used for FVW anaerobic treatment (A) continuously stirred tank reactor (CSTR) (B) tubular reactor (C) two-phase integrated anaerobic solid bed hydrolyser (SBH) and upflow anaerobic sludge blanket (UASB) (D) two-phase integrated anaerobic CSTR and fixed film reactor (FFR) and (E) two-phase integrated anaerobic sequencing batch reactor and FFR (Bouallagui ef ai, 2005). [Pg.106]

C Two-Phase Fixed Bed Catalytic Reactors with Cocurrent Upflow. "Upflow Packed Bubble Reactors"... [Pg.717]


See other pages where Two-phase upflow fixed-bed reactors is mentioned: [Pg.97]    [Pg.98]    [Pg.99]    [Pg.99]    [Pg.106]    [Pg.107]    [Pg.97]    [Pg.98]    [Pg.99]    [Pg.99]    [Pg.106]    [Pg.107]    [Pg.105]    [Pg.107]    [Pg.99]    [Pg.520]   
See also in sourсe #XX -- [ Pg.97 , Pg.99 ]




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Reactor phase

Reactors two-phase

Upflow

Upflow fixed beds

Upflow reactor

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