Regenerative catalytic oxidation

Process Stream % LEL Catalytic Recuperative Oxidizer Thermal Recuperative Oxidizer Regenerative Catalytic Oxidizer Regenerative Thermal Oxidizer Rotor Concentrator with Thermal Oxidizer... 

Operational Modes The Catalytic Recuperative Oxidizer assumes a 65% efficienct heat exchanger. The Thermal Recuperative Oxidizer assumes a 65% efficienct heat exchanger The Regenerative Catalytic Oxidizer assumes a 95% efficienct heat exchanger The Regenerative Thermal Oxidizer assumes a 95% efficient heat exchanger. The rotor concentrator wheel assumes a 6 1 concentration ratio. 

RFRs for VOC oxidation (also referred to as regenerative catalytic oxidizers, or RCOs) are often designed assuming single irreversible exothermic reaction. Mechanisms of complete oxidation of organics are complex, particularly for oxidation of multicomponent mixtures... 

Case 3 Regenerative Catalytic Oxidation Catalysts 7.4.1. Introduction... 

Gribbon, S. (1996). Regenerative Catalytic Oxidation, Special Conference for VOC andAir Toxic Control, Air and Waste Management Association Clearwater, FL, pp. 88-97. 

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... 

REGEN A process for removing mercaptans from hydrocarbon fractions by catalytic oxidation and extraction with aqueous alkali, using a bundle of hollow fibers. Developed by the Merichem Company, Houston, TX, and used in 34 plants as of 1991. 

In the presence of an oxidant, e.g., chlorate or bromate ions, the electrode reaction is transposed into an adsorption coupled regenerative catalytic mechanism. Figure 2.85 depicts the dependence of the azobenzene net peak current with the concentration of the chlorate ions used as an oxidant. Different curves in Fig. 2.85 correspond to different adsorption strength of the redox couple that is controlled by the content of acetonitrile in the aqueous electrolyte. In most of the cases, parabolic curves have been obtained, in agreement with the theoretically predicted effect for the surface catalytic reaction shown in Fig. 2.81. In a medium containing 50% (v/v) acetonitrile (curve 5 in Fig. 2.85) the current dramatically increases, confirming that moderate adsorption provides the best conditions for analytical application. 

Trapping the carbonyl compound 1 in Scheme 3.3 with various nucleophiles provides various catalytic oxidative transformations of alcohols. When a primary or secondary amine is employed as a nucleophile, intermediate 13 undergoes nucleophilic reaction with amine to give iminium ion complex 14 along with water. Intramolecular hydride transfer of 14 gives the corresponding N-alkylated amine 15 with regen-... 

Regenerative heat exchange can be more expensive to install but can readily offer 95% heat recovery efficiency. Regenerative systems are therefore best suited to more dilute streams or those with variable VOC concentration they are widely used in coatings applications. Recuperative systems are more cost effective for higher-concentration VOC streams of constant composition they find widespread use in chemical production. Both recuperative and regenerative heat recovery can be used with either thermal or catalytic oxidation systems and with secondary heat recovery. 

Parameter Condensation Absorption Adsorption Regenerative Incineration oxidation Catalytic oxidation Flameless oxidation BIF combustion Biofiltration Flares... 

Typical operating conditions and performance for the REGENOX regenerative heat exchange catalytic oxidation process as provided by Haldor Topspe (1990) are conversion efEciency >99%, heat exchange efficiency 95%, operating temperature in hottest zone 300°C (572°F). The system uses a metal oxide-based catalyst that is capable of operating at temperatures up to 600 C (1,112°F). 

SWITGTHERM A catalytic process for oxidizing volatile organic compounds (VOCs). It involves regenerative heat exchange, which permits autothermal operation at VOC concentrations in the range 250 to 650 ppm. Developed in Poland and now used in over 100 installations there. 

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