scholarly journals Studies on Polymerization and Depolymerization of ε-Caprolactam Polymer VI. On the Reaction Mechanism of the ε-Caprolactam Polymerization by Alkali Metal Compound

1958 ◽  
Vol 31 (8) ◽  
pp. 913-917 ◽  
Author(s):  
Hirosuke Yumoto ◽  
Naoya Ogata
Keyword(s):  
Reaction Mechanism ◽  
Alkali Metal ◽  
Metal Compound ◽  
Caprolactam Polymerization

Modeling fine particles and alkali metal compound behavior in a kraft recovery boiler

TAPPI Journal ◽  
2012 ◽  
Vol 11 (7) ◽  
pp. 9-14 ◽  
Author(s):  
AINO LEPPÄNEN ◽  
ERKKI VÄLIMÄKI ◽  
ANTTI OKSANEN
Keyword(s):  
Alkali Metal ◽  
Computational Models ◽  
Fine Particles ◽  
Black Liquor ◽  
Melting Behavior ◽  
Metal Compound ◽  
Effect Of Temperature ◽  
Particle Model ◽  
Boiler Furnace ◽  
Recovery Boiler

Under certain conditions, ash in black liquor forms a locally corrosive environment in a kraft recovery boiler. The ash also might cause efficiency losses and even boiler shutdown because of plugging of the flue gas passages. The most troublesome compounds in a fuel such as black liquor are potassium and chlorine because they change the melting behavior of the ash. Fouling and corrosion of the kraft recovery boiler have been researched extensively, but few computational models have been developed to deal with the subject. This report describes a computational fluid dynamics-based method for modeling the reactions between alkali metal compounds and for the formation of fine fume particles in a kraft recovery boiler furnace. The modeling method is developed from ANSYS/FLUENT software and its Fine Particle Model extension. We used the method to examine gaseous alkali metal compound and fine fume particle distributions in a kraft recovery boiler furnace. The effect of temperature and the boiler design on these variables, for example, can be predicted with the model. We also present some preliminary results obtained with the model. When the model is developed further, it can be extended to the superheater area of the kraft recovery boiler. This will give new insight into the variables that increase or decrease fouling and corrosion

Influence of Alkali Metal Cations upon the Kolbe−Schmitt Reaction Mechanism

2006 ◽  
Vol 46 (5) ◽  
pp. 1957-1964 ◽  
Author(s):  
Zoran Marković ◽  
Svetlana Marković ◽  
Nebojša Begović
Keyword(s):  
Reaction Mechanism ◽  
Alkali Metal ◽  
Metal Cations ◽  
Alkali Metal Cations

Mechanism of Alkali Metal Compound-Promoted Growth of Monolayer MoS2: Eutectic Intermediates

2019 ◽  
Vol 31 (3) ◽  
pp. 873-880 ◽  
Author(s):  
Peng Wang ◽  
Jiayu Lei ◽  
Jiafan Qu ◽  
Shengyong Cao ◽  
Hu Jiang ◽  
...  
Keyword(s):  
Alkali Metal ◽  
Metal Compound ◽  
Monolayer Mos2

Mechanism of 1-phenyl-1,4-dihydropyridine formation in reaction of 1-phenylpyridinum chloride with alkali metal alkoxides

1984 ◽  
Vol 49 (3) ◽  
pp. 597-602
Author(s):  
Josef Kuthan ◽  
Jiří Krechl ◽  
Martin Bělohradský ◽  
Petr Trška
Keyword(s):  
Reaction Mechanism ◽  
Alkali Metal ◽  
Quaternary Salt ◽  
Metal Alkoxides ◽  
Unsaturated Aldehyde

Quaternary salt Ia reacts with sodium and lithium alkoxides to give 1-phenyl-1,4-dihydropyridine (IIIa) together with unsaturated aldehyde IVa. The reaction mechanism for formation of compound IVa from the primarily arising 2-alkoxy-1-phenyl-1,2-dihydropyridines is suggested on the basis of products IIIb and IVb, arising from the 3,4,5-trideuterio precursor Ib.

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