Journal ArticleDOI
Mass Transfer and Solubility in Autocatalytic Oxidation of Cyclohexane
TLDR
In this paper, a modified Henry's law coefficient of 1.09 x lo-' kmol/m3. bar can be regarded as constant over the temperature range 293-435 K.Abstract:
Mass transfer coefficients for the solution, without reaction, of oxygen in cyclohexane over a wide range of temperature and pressure have been measured in a flat interface reactor (FIR) and a gas sparged stirred-tank reactor (STR). Solubilities have also been measured and it is suggested that a modified Henry's law coefficient of 1.09 x lo-' kmol/m3 . bar can be regarded as constant over the temperature range 293-435 K. The physical mass transfer coefficient in the STR shows very little variation over this temperature range and a value of 3.5 x m/s can be assumed for 423-435 K. However, coefficients in the FIR increase with agitation rate as expected. The difference is ascribed to interference by neighboring bubbles in the transfer process, when diffusivities are high, and also to the lowering of surface tension at high temperatures. A model proposed by Gal-Or and Resnick is reviewed in its application to the present system.read more
Citations
More filters
Journal ArticleDOI
Engineering Aspects of Industrial Liquid-Phase Air Oxidation of Hydrocarbons
TL;DR: In this article, the role of mass transfer in the rate of reaction and selectivity for the desired product is discussed, and different types of reactors that are used, including bubble-column and mechanically agitated, are analyzed, and a simple basis is provided for selection of reactors.
Journal ArticleDOI
Industrial production and use of adipic acid
TL;DR: In this paper, the current status of single-step and two-step oxidation processes for the production of adipic acid from cyclohexane, which are compared with alternative preparation processes, is discussed.
Journal ArticleDOI
To the core of autocatalysis in cyclohexane autoxidation.
TL;DR: Solid evidence is presented that, also in absence of oxygenates, ROOH initiation is actually a bimolecular reaction, involving concerted H abstraction from the alkane substrate by the nascent (.)OH.
Journal ArticleDOI
Mechanisms of physical and reaction enhancement of mass transfer in a gas inducing stirred slurry reactor
TL;DR: In this paper, the authors evaluated four mechanisms for the enhancement of gas-liquid (G-L) mass transfer in a gas inducing stirred slurry reactor (GIR) in a range of mixing intensities.
Journal ArticleDOI
Release rates from semi-crystalline polymer microcapsules formed by interfacial polycondensation
TL;DR: In this article, the authors determined the product of the polyurea microcapsules for encapsulated cyclohexane and showed that the product can be changed over at least an order of magnitude by changing the degree of crystallinity of the polymer forming the membranes.
References
More filters
Book
The mathematics of diffusion
TL;DR: Though it incorporates much new material, this new edition preserves the general character of the book in providing a collection of solutions of the equations of diffusion and describing how these solutions may be obtained.
Journal ArticleDOI
Viscous flow in multiparticle systems: Slow motion of fluids relative to beds of spherical particles
TL;DR: In this paper, a mathematical treatment is developed on the basis that two concentric spheres can serve as the model for a random assemblage of spheres moving relative to a fluid, and the appropriate boundary conditions resulting from these assumptions enable a closed solution to be obtained satisfying the Stokes-Navier equations omitting inertia terms.
Journal ArticleDOI
The continuous phase heat and mass transfer properties of dispersions
P.H. Calderbank,M.B. Moo-Young +1 more
TL;DR: In this paper, the authors measured the interfacial area in gas-liquid dispersions and correlated the data with other published data for heat and mass transfer in liquid-liquid and solid-gas dispersions in which the dispersed phases are free to move under the action of gravity.
Journal ArticleDOI