Reaction Mechanism of 1-Hexanol and di-n-Hexyl Ether over Alumina in a Flow System

Langer, Robert; Walker, Charles A.

doi:10.1021/ie50534a051

Cited by 7 publications

(1 citation statement)

References 3 publications

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“…Several reactor concepts for achieving gradientless reactor operation have been described in the literature (Bennett et al, 1972;Berty, 1974;Berty et al, 1969;Brisk et al, 1968, Butt, 1971; Carberry, 1964, Garanin et al, 1967;Gelain, 1969; Langer and Walker, 1954; Perkins and Rase, 1958;Satterfield and Roberts, 1968). Continuous-flow recirculation and stirred-tank reactors have particular advantages for kinetic studies involving broad ranges of reactant and product concentrations (Carberry, 1964;Bennett, 1967).…”

mentioning

confidence: 99%

An All-Glass Internal Recycle Reactor

Fitzharris¹,

Katzer²

1978

Ind. Eng. Chem. Fund.

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mentioning

confidence: 99%

An All-Glass Internal Recycle Reactor

Fitzharris¹,

Katzer²

1978

Ind. Eng. Chem. Fund.

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The dehydration of alcohols

Knözinger¹

1971

The Hydroxyl Group (1971)

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Rates of reaction in a recycling system—dehydration of ethanol and diethyl ether over alumina

1962

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A new method for measuring isothermal rates of heterogeneously catalyzed gas reactions is described. The method involves a differential reactor incorporated in a recycling system and affords ease of control, occuracy, and many rate measurements in one run.The results for the reaction system investigated show that four reactions are important: the dehydration of ethanol to ethylene, the reaction of ethanol to form diethyl ether, the dehydration of diethyl ether to ethylene, and the reaction of diethyl ether to form ethanol.It is also shown that the rate controlling steps are the monomolecular surface reactions for the two dehydrations and for the formation of ethanol from diethyl ether, and the bimolecular surface reaction for the formation of diethyl ether from ethanol. The values and the temperature dependence of all pertinent rate and adsorption constants are determined and reported, and they are shown conversion.The measurement of the isothermal rates of heterogeneously catalyzed gas reactions is ordinarily accomplished directly in differential reactors or indirectly in integral ones. The former is a powerful method but difficulties are met in analyzing small differences in concentration across the short bed. The use of integral conversion data is limited by the necessity to hypothesize a rate equation before interpretation is possible and by the experimental problem of maintaining isothermal conditions in the reactor.A recycling differential reactor, first proposed by Dohse ( 5 ) , affords ease of temperature control, accuracy of analysis, and direct measurement of rates. A new reactor based on Dohse's original idea but extensively improved and modernized has been developed and used in this research. Reactants and products are continuously circulated through the catalyst, and samples of the reaction mixture are withdrawn frequently for analysis. The extent of reaction per pass through the catalyst bed is very small; consequently maintenance of isothermal conditions is not difficult. Conversion data, and thus rate data, are determined at many points in a run from the sample analyses, so increased accuracy of the rate data is assured. A run may be continued until very high conversions are attained; hence it is possible to meas- Page 42to correlate very well the'data up to 80% ure the rates over an unusually wide range of conversion in one run.A somewhat similar device was used by Smith, et al.( 1 3 ) , with considerable success for ion exchange systems. Perkins and Rase (10) and Polotniuk and Dobrovol 'skii (11 ) have reported the use of reactor systems involving recycling operations. These devices however involve recychg the reactants and products in a steady state measurement of rates at a given conversion and are not similar to the system described here.The dehydration of ethyl alcohoI over alumina catalyst was selected for study because such rates have not been well-defined and because a moderately complicated array of simultaneous and consecutive reactions is involved. Diethyl ether is an intermediate, and...

show abstract

Reaction Mechanism of 1-Hexanol and di-n-Hexyl Ether over Alumina in a Flow System

Cited by 7 publications

References 3 publications

An All-Glass Internal Recycle Reactor

An All-Glass Internal Recycle Reactor

The dehydration of alcohols

Rates of reaction in a recycling system—dehydration of ethanol and diethyl ether over alumina

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