GAS–SOLID EXCHANGE STUDIES BY THE FLOW METHOD: Zn–ZnS AND Zn–ZnO REACTIONS

1964 ◽  
Vol 42 (10) ◽  
pp. 2334-2339
Author(s):  
Allan J. MacKinnon ◽  
Ronald R. Martin ◽  
E. A. Secco
Keyword(s):  
Zinc Oxide ◽  
Exchange Rate ◽  
Zinc Sulphide ◽  
Static Method ◽  
Vapor Flow ◽  
Zinc Vapor ◽  
Flow Rates ◽  
Flow Method ◽  
Polycrystalline Zinc ◽  
Existing Data

The initial exchange of zinc vapor with polycrystalline zinc oxide and zinc sulphide has been studied by a flow method under different conditions of zinc vapor flow rates and temperature. The exchange rate was found to be independent of flow rate. Kinetic and mechanism interpretations of these results along with existing data from exchange studies by the static method are discussed.

GAS–SOLID EXCHANGE REACTIONS: ZINC VAPOR AND POLYCRYSTALLINE ZINC SULPHIDE

1964 ◽  
Vol 42 (6) ◽  
pp. 1396-1400 ◽  
Author(s):  
E. A. Secco
Keyword(s):  
Zinc Sulphide ◽  
Static System ◽  
Zinc Vapor ◽  
Exchange Reactions ◽  
Polycrystalline Zinc ◽  
Diffusion Controlled ◽  
Fraction Versus ◽  
Exchange Kinetics ◽  
Kinetics Of ◽  
Initial Process

The exchange kinetics of zinc vapor with polycrystalline zinc sulphide, wurtzite structure, have been studied in a static system in the temperature range 720–960 °C.Plots of log10(1−α*), i.e. exchange fraction, versus time reveal two processes. The initial process is a rapid simple exchange, for which the data fit a first-order rate law and which persists to a depth of 15–18 molecular thicknesses. At this depth the second, slower process, which appears to be diffusion-controlled, sets in. Kinetic and structural interpretations of these results along with the existing data on Zn–ZnO exchange are discussed.

scholarly journals Intensification of Reactive Distillation for TAME Synthesis Based on the Analysis of Multiple Steady-State Conditions

Processes ◽  
2018 ◽  
Vol 6 (12) ◽  
pp. 241 ◽  
Author(s):  
Takehiro Yamaki ◽  
Keigo Matsuda ◽  
Duangkamol Na-Ranong ◽  
Hideyuki Matsumoto
Keyword(s):  
Liquid Flow ◽  
Reactive Distillation ◽  
Steady States ◽  
Vapor Flow ◽  
Multiple Steady States ◽  
Reflux Ratio ◽  
Flow Rates ◽  
Reaction Conversion ◽  
Reaction Performance ◽  
Separation Performances

Our previous study reported that operation in multiple steady states contributes to an improvement in reaction conversion, making it possible to reduce the energy consumption of the reactive distillation process for tert-amyl methyl ether (TAME) synthesis. This study clarified the factors responsible for an improvement in the reaction conversion for operation in the multiple steady states of the reactive distillation column used in TAME synthesis. The column profiles for those conditions, in which multiple steady states existed and those in which they did not exist, were compared. The vapor and liquid flow rates with the multiple steady states were larger than those when the multiple steady states did not exist. The effect of the duty of the intermediate condenser, which was introduced at the top of the reactive section, on the liquid flow rate for a reflux ratio of 1 was examined. The amount of TAME production increased from 55.2 to 72.1 kmol/h when the intermediate condenser was operated at 0 to −5 MW. Furthermore, the effect of the intermediate reboiler duty on the reaction performance was evaluated. The results revealed that the liquid and vapor flow rates influenced the reaction and separation performances, respectively.

Anomalous thermal desorption from polycrystalline zinc oxide films

1984 ◽  
Vol 121 (3) ◽  
pp. L85-L88 ◽  
Author(s):  
T.L. Tansley ◽  
C.P. Foley ◽  
D.F. Neely
Keyword(s):  
Zinc Oxide ◽  
Thermal Desorption ◽  
Oxide Films ◽  
Zinc Oxide Films ◽  
Polycrystalline Zinc

A Stirred-Flow Reactor for Investigating the Kinetics of Gaseous Reactions: Application to the Decomposition of Di-t-butyl Peroxide

1961 ◽  
Vol 14 (4) ◽  
pp. 534 ◽  
Author(s):  
MFR Mulcahy ◽  
DJ Williams
Keyword(s):  
Excellent Agreement ◽  
Rate Constant ◽  
Flow Reactor ◽  
Reaction Times ◽  
Static Method ◽  
Flow Conditions ◽  
Gaseous Reaction ◽  
Flow Method ◽  
Butyl Peroxide ◽  
Kinetics Of

The uncertainty regarding temperature and flow conditions which attaches to the conventional flow method of determining the rate of a gaseous reaction can be substantially reduced by using a stirred-flow reactor. The reagents, products, and carrier-gas (if any) are mixed sufficiently vigorously for the composition of the gas in the reactor to be virtually uniform. A reactor designed to achieve the required degree of mixing at pressures of about 1 cmHg and reaction times of the order of 1 sec to 1 min is described. The rate constant of the decomposition of di-t-butyl peroxide was determined over the temperature range 430-550 �K. The values derived on the assumption of complete mixing in the reactor were independent of the degree of conversion and in excellent agreement with those obtained by previous authors using the static method.

Measurement on Work Function of Polycrystalline Zinc Oxide Covered by Organic Dye

1969 ◽  
Vol 8 (S1) ◽  
pp. 42 ◽  
Author(s):  
Shinichi Kikuchi ◽  
Yasusuke Takahashi ◽  
Toshifumi Sakata
Keyword(s):  
Zinc Oxide ◽  
Work Function ◽  
Organic Dye ◽  
Polycrystalline Zinc

Conduction mechanism in sputtered polycrystalline zinc oxide thin films

1984 ◽  
Vol 117 (1) ◽  
pp. 19-32 ◽  
Author(s):  
T.L. Tansley ◽  
D.F. Neely ◽  
C.P. Foley
Keyword(s):  
Thin Films ◽  
Zinc Oxide ◽  
Conduction Mechanism ◽  
Oxide Thin Films ◽  
Polycrystalline Zinc

scholarly journals Photoanodic oxidation of D-glucose on a polycrystalline zinc oxide electrode in an alkaline solution.

1986 ◽  
pp. 1-7 ◽  
Author(s):  
Tamihiko KATO ◽  
Akira FUJISHIMA ◽  
Eturô MAEKAWA ◽  
Kenichi HONDA
Keyword(s):  
Zinc Oxide ◽  
Alkaline Solution ◽  
Oxide Electrode ◽  
Polycrystalline Zinc
Sign in / Sign up

Export Citation Format

Share Document