A. Romero

Kinetics of the selective hydrogenation of phenol to cyclohexanone over a Pd-alumina catalyst

The most suitable kinetic equation for the selective hydrogenation of phenol to cyclohexanone on a 0.96wt.% Pd-9.63wt.%CaO-alumina (Harshaw AL-3965) catalyst is determined among a series of models based on Langmuir-Hinshelwood-Hougen-Watson theory.AbstractОпределено кинетическое уравнение селективного гидрирования фенола до циклогексанона на катализаторе 0,96 вес. %Pd-9,63 вес.%CaO/Al2O3 (Harshaw AL-3965). Оно оказалось наиболее подходящим среди серии моделей, основанных на теории Лангмюра-Хинщельвуда-Хугена-Ватсона.

OPTIMIZATION OF THE OPERATION IN A REACTOR WITH CONTINUOUS CATALYST CIRCULATION IN THE GASEOUS BENZYL ALCOHOL POLYMERIZATION

Abstract Polymerization of gaseous benzyl alcohol was studied on a commercial zeolite (MZ-7P supplied by Akzo-Chemie) in a jet spouted bed reactor which is an original gas-solid contact technique whose use in this type of processes has not yet been described in relevant literature. Properties of the catalyst-particles-bed and polymer production are calculated by a simulation routine as a function of the following operating variables: the partial pressure of the benzyl alcohol fed into the reactor and the average residence time of the catalyst particles in the reactor. The simulation method and the kinetic equations used have been checked by experimental data. An analysis of the effect or the operating conditions is carried out, thus determining the values which enable maximum production.

Analysis of the temperature-time sequences for deactivating isothermal catalyst beds

A procedure is shown to determine the temperature-time sequences to keep the conversion at outlet of a fixed bed reactor subject to catalyst deactivati constant. The calculated sequences for different reaction systems follow the equation: t=k0/k0dEEd exp(EdRT0/1.258×105pA0.79{1-exp[EdR(1T- 1T0)]}. From the analysis of the calculated sequences we have determined the values of the parameters of operation (space time, conversion and initial temperature) that give maximum values to the two functions which we sought to maximize, namely the time of operation and production.

Kinetic study of the regeneration of solid catalysts under internal diffusion restrictions

Abstract The experimental conditions under which combustion is controlled by internal diffusion of the air have been determined for the regeneration of two amor

The control of the temperature and the feed in deactivating isothermal catalyst beds

Abstract A comparison of the space time policy and the temperature policy to be followed in order to maintain a constant outlet conversion in spite of catalyst Graphic design charts which allow the catalyst lifetime and the production for a given conversion rate to be determined are presented for both strategi Finally, catalyst lifetime and production values obtained following these policies are compared.

Relation Between the Preparation and the Morphology of Silica-Alumina Gels

The effect of the variables involved in the preparation of silica-alumina gels on their morphology has been analysed by experimental design techniques. Relationships between the surface area and pore volume of the gels and the variables with the greatest influence, namely precipitation rate and temperature, impregnation concentration and calcination temperature have been obtained.

Surface activity of silice-alumina catalysts in relation to the preparation variables

Factorial and rotational designs have been used to analyse the effect of each preparative variable on the surface acid strength distribution in silica-alumina catalysts. Relationships between the surface acidities at pKa = 2·8, 3·3 and 4·8 and the most important variables, namely precipitation rate and temperature, drying pressure and temperature, impregnation concentration and calcination temperature have been obtained.

Sequential design of experiments for optimal model discrimination and parameter estimation in isopropanol dehydration

We apply the methodology of the sequential design of an experimental program for model discrimination and parameter estimation to a real kinetic investigation: the dehydration of isopropanol over silica-alumina