Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Reverse Flow Reactors

The cleaning of flue gases from stationary sources is another field in which the application of monolithic catalysts will certainly rise. There will be no versatile catalyst for cleaning all off-gases. Therefore tailor-made catalysts with zeoliths of various types for specific applications will be developed. Incorporated-type monolithic catalysts are likely to prevail in this field. Since cleaning usually requires a set of equipment items in series (e.g., converter, heat exchangers), multifunctional reactors (reverse-flow reactors, rotating monoliths) will become more common. [Pg.12]

Hybrid reactors reverse flow, reactive distillation, reactive extraction, reactive crystallization, chromatographic reactions, membrane reactions, fuel cells... [Pg.367]

Many accidents occur because process materials flow in the wrong direction. Eor example, ethylene oxide and ammonia were reacted to make ethanolamine. Some ammonia flowed from the reactor in the opposite direction, along the ethylene oxide transfer line into the ethylene oxide tank, past several non-return valves and a positive displacement pump. It got past the pump through the relief valve, which discharged into the pump suction line. The ammonia reacted with 30m of ethylene oxide in the tank, which ruptured violently. The released ethylene oxide vapor exploded causing damage and destruction over a wide area [5]. A hazard and operability study might have disclosed the fact that reverse flow could occur. [Pg.996]

The most serious incidents resulting from reverse flow have occurred when reactant A (Figure 18-5) has passed from the reactor up the reactant B feed line and reacted violently with B. [Pg.331]

Figure 18-5. Reverse flow of A occurred from the reactor into the B stock tank. Figure 18-5. Reverse flow of A occurred from the reactor into the B stock tank.
Case - Utilization of Reverse Flow Reactor (RFR) in Industrial CI-VOC Oxidation... [Pg.152]

The reverse flow reactor (RFR) concept was originally patented by Cottrell in 1938 [64] in the United States and further developed and appHed to different purposes by several researchers, for example, Matros and coworkers [65]. This technology has found its application also in the field of catalytic oxidation [66]. The incinerator containing two sets of regenerative-type heat exchangers and at least two catalyst honeycombs uses flow reversal to recover the heat produced in exothermal oxidation reactions [67]. A regenerative heat exchanger can typically achieve a heat... [Pg.152]

Reverse-flow reactors Reactive distillation Reactive extraction Reactive crystalization Chromatographic reactors Periodic separating reactors Membrane reactors Reactive extrusion Reactive comminution Fuel cells... [Pg.248]

Xiao, W.-D., and Yuan, W.-K., Modelling and simulation for adiabatic fixed-bed reactor with flow reversal. Chem. Eng. Sci. 49(21), 3631-3641 (1994). [Pg.281]

Reverse Flow Fall in line press, (compressor fails) high pressure at reactor NH3 in compressor — explosion hazard fit non-return valve (NRV1) hot wet acid gas-corrosion fit second valve (NRV4)... [Pg.387]

In the reverse flow type, the hydrotreater reactor is fed with fresh and recycled feeds, and is operated to accomplish partial conversion of that combined feed in the first stage. A graded HDT-HCK bed or a multi-functional catalyst can be used in the first stage. A very effective H2 separation is used for the first-stage effluent gas. A bottoms fractionator or an adsorption unit is used for removal of heavy PAHs. Carbon adsorption extends the catalyst life. The liquid product of the first reactor is mixed with a mixture of fresh and recycled H2. The whole second stage effluent is hydrotreated in the first stage. [Pg.46]

Airco A modification of the Deacon process for oxidizing hydrogen chloride to chlorine. The copper catalyst is modified with lanthanides and used in a reversing flow reactor without the need for external heat. Developed by the Air Reduction Company from the late 1930s. U.S. Patents 2,204,172 2,312,952 2,271,056 2,447,834. [Pg.14]

F. Hershkowitz, P. J. Berlowitz, R. F. Socha, E. Marucchi-Soos and J. W. Frederick, Hydrogen Production via Steam Reforming in a Reverse-Flow Reactor, AlChE Annual Meeting, Fuel Cell Topical Conference paper 501 f (2005). [Pg.142]

With the introduction of microreactors, transient reactor operations became interesting due to their low internal reactor volume and, thus, fast dynamic behavior. In 1999, Liauw et al. presented a periodically changing flow to prevent coke development on the catalyst and to remove inhibitory reactants in an IMM microchan-nel reactor [58]. This work was preceded by Emig in 1997, of the same group, who presented a fixed-bed reactor with periodically reversed flow [59]. In 2001, Rouge et al. [14] presented the catalytic dehydration of isopropanol in an IMM microreactor. [Pg.106]

Sulfur from H2S (Claus process) 96 Reverse-flow adsorptive reactor... [Pg.281]

Kolios G, Eigenberger G. Styrene synthesis in a reverse-flow reactor. Chem. Eng. Sci 1999 54 2637-2646. [Pg.416]

Kikas et al. [47] operated a micro structured autothermal reformer for methane in the conventional and reverse flow mode. Owing to the reverse flow conditions, a more uniform temperature profile was achieved in the reactor (Figure 2.21). [Pg.312]

Figure 2.21 Temperature and species concentration profiles in a reverse-flow reactor (a) flow direction is left to right (b) flow is reversed to be from right to left (c) periodic quasi-steady state [47] (by courtesy of ACS). Figure 2.21 Temperature and species concentration profiles in a reverse-flow reactor (a) flow direction is left to right (b) flow is reversed to be from right to left (c) periodic quasi-steady state [47] (by courtesy of ACS).
The primary system is intended to isolate the major equipment in order to prevent reverse flow and exhaust oxides in a gaseous state. It consists of a special restraint type valve (check) and two motorised shutdown valves, arranged in series. The system includes a low pressure detector on the main pipe that trips the sulphuric acid pumps, isolates the process and stops the helium flow into the reactor and heaters (emergency system EAS-200). [Pg.400]


See other pages where Reverse Flow Reactors is mentioned: [Pg.189]    [Pg.189]    [Pg.2225]    [Pg.331]    [Pg.153]    [Pg.3]    [Pg.227]    [Pg.248]    [Pg.279]    [Pg.280]    [Pg.84]    [Pg.73]    [Pg.454]    [Pg.138]    [Pg.138]    [Pg.138]    [Pg.140]    [Pg.156]    [Pg.187]    [Pg.34]    [Pg.40]    [Pg.389]    [Pg.403]    [Pg.414]    [Pg.996]    [Pg.16]   
See also in sourсe #XX -- [ Pg.152 ]




SEARCH



Reversing flows

© 2024 chempedia.info