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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
21

Measurement and calculation of temperature and conversion in fixed-bed catalytic reactors

Kjær, Jørgen. January 1958 (has links)
Thesis--Polyteknisk læreanstalt, Copenhagen. / Summaries in English and Danish. Bibliography: p. [185]-201.
22

The modelling and dynamics of catalysts and fixed bed reactors

Jensen, Klavs Flemming. January 1900 (has links)
Thesis (Ph. D.)--University of Wisconsin--Madison, 1980. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 651-690).
23

Chemical reactor networks for combustion systems modeling /

Novosselov, Igor V. January 2006 (has links)
Thesis (Ph. D.)--University of Washington, 2006. / Vita. Includes bibliographical references (leaves 202-213).
24

Design of model reactor systems for evaluating disinfectants against biofilm bacteria

Goeres, Darla Marie. January 2006 (has links) (PDF)
Thesis (Ph. D.)--Montana State University--Bozeman, 2006. / Typescript. Chairperson, Graduate Committee: Alfred B. Cunningham. Includes bibliographical references.
25

Simultaneous reaction and separation using a distillation column

Daniel, Patrick D. January 1970 (has links)
A study has been made using computer simulation of a fractionating column with simultaneous distillation and chemical reaction occurring. The assumptions of 100% efficient trays and ideality of vapor-liquid equilibrium and thermal properties were made. Results show that the extent to which a reversible reaction can be driven, or an irreversible side reaction inhibited, is a strong function of the ease with which the reaction products may be removed using the separating capacity of the fractionating column. The quantity of liquid holdup per plate is also a factor of considerable importance in the performance of a fractionating column with chemical reaction, but its effect is not simple, interacting as it does with the reflux ratio. The effect of system pressure is complex. Increasing pressure raises temperatures, and therefore reaction rates but decreases separation factors. The influence of this with respect to the main reaction and any undesirable side reactions is so specific to the chemical reaction being studied that no overall generalization can usefully be made. Considering only the point of view of the amount of reaction achieved, a fractionating column can show considerable improvement over a continuous stirred tank reactor. / Applied Science, Faculty of / Chemical and Biological Engineering, Department of / Graduate
26

Reactor design for the hydrolysis of lactose in acid milk whey using B-galactosidase immobilized on a porous phenol-formaldehyde resin /

Okos, Martin Robert January 1975 (has links)
No description available.
27

Optimal control of reactors in an ethylene plant.

Wilson, John Thurston. January 1971 (has links)
No description available.
28

Optimal control of reactors in an ethylene plant.

Wilson, John Thurston. January 1971 (has links)
No description available.
29

Metathesis of 1-hexene over a WO3/SiO2 catalyst in a gas-phase fixed bed reactor.

Lokhat, David. January 2008 (has links)
The performance of a WO3/SiO2 catalyst has been investigated for the metathesis of 1-hexene in an isothermal, gas-phase fixed bed tubular reactor between 420-500°C and at latm. The reactor was fabricated from stainless steel and was placed in an electric tube furnace. The study focused on the effect of operating conditions (reaction temperature, feed gas composition and space time) on the yield of heavy olefins (C7 - C16) and the primary product, decene, using a full factorial experimental design. The objective was to determine the optimum operating conditions for the production of decene. Compositions of condensed liquid and vapour product streams were determined via gas-liquid chromatography. Oxidative and reductive pre-treatments of the catalysts were compared to a conventional pre-treatment under nitrogen in terms of their effect on conversion and product distribution. Experimental tests for the existence of external and internal mass transfer resistances were also conducted. An improved yield of decene was obtained after oxidative pre-treatment of the catalyst. The conversion of l-hexene, selectivity and yield of decene dropped after pre-treatment under hydrogen and nitrogen only. This may be due to over-reduction of the tungsten centres and the formation of an inactive non-stoichiometric surface phase. The best yield of decene obtained from the experimental design was 2.19% at 420°C, 51% feed composition and 661g.min.mo1-1. The yield of decene decreased by 0.11% when the reaction temperature was raised by 40°C, and by 0.17% when the feed gas composition was raised by 17.5% and increased by 0.21% when the space time was increased by 223g.min.mol-1. The large amount of ethylene and propylene produced as well as the formation of polynuclear aromatics suggest significant cracking of 1-hexene. For the size range and flow-rates that were employed, the reaction does not suffer from intraparticle and external mass transfer resistance effects. It was concluded that a combination of lower temperature, lower feed gas composition and higher space time should be used to maximize the yield of decene. A final experiment was conducted to test this conclusion. At 380°C, 55% feed composition and 2875g.min.mol-1, the yield of decene was 12.80%, which represented a significant improvement. / Thesis (M.Sc.Eng.)-University of KwaZulu-Natal, 2008.
30

Investigation of catalytic partial oxidation of methane using platinumnickel dual bed reactors

Bell, Christa. January 2006 (has links)
The catalytic partial oxidation of methane to produce synthesis gas using a platinum/nickel dual bed reactor has been shown to have high conversions and selectivity of synthesis gas products, hydrogen and carbon monoxide. In this work the relative length of the platinum and nickel in the dual bed reactor is investigated experimentally and a model describing the nickel portion of the dual bed catalyst is developed. The model uses simplified flow conditions, experimentally determined temperature profiles and an elementary reaction mechanism to describe the nickel bed of the reactor. The rate parameters of the elementary reaction in the mechanism are determined using theoretical methods. Unity Bond Index - Quadratic Exponential Potential (UBI-QEP) is used to determine the activation energy and thermodynamic consistency is forced to produce a set of preexponential factors.

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