The Effect of Na2O and K2O on the Partition Ratio of Phosphorus between CaO-SiO2-FetO-P2O5Slag and Carbon-Saturated Iron

2013 ◽  
Vol 84 (7) ◽  
pp. 687-694 ◽  
Author(s):  
Guangqiang Li ◽  
Chengyi Zhu ◽  
Yongjun Li ◽  
Xiongyuan Huang ◽  
Min Chen
Keyword(s):  
Partition Ratio ◽  
Carbon Saturated Iron

scholarly journals Formal Synthesis of (±)-Allocolchicine Via Gold-Catalysed Direct Arylation: Implication of Aryl Iodine(III) Oxidant in Catalyst Deactivation Pathways

2017 ◽  
Vol 60 (8) ◽  
pp. 570-579 ◽  
Author(s):  
Tom J. A. Corrie ◽  
Guy C. Lloyd-Jones
Keyword(s):  
Catalyst Deactivation ◽  
Kinetic Modelling ◽  
Gold Catalyst ◽  
Side Reaction ◽  
Partition Ratio ◽  
Alkylation Reaction ◽  
Formal Synthesis ◽  
H Nmr ◽  
Diaryliodonium Salt ◽  
Deactivation Process

Abstract A concise formal synthesis of racemic allocolchicine has been developed, centred on three principal transformations: a retro-Brook alkylation reaction to generate an arylsilane, a gold-catalysed arylative cyclisation to generate the B-ring via biaryl linkage, and a palladium-catalysed carbonylation of an aryl chloride to generate an ester. 1H NMR monitoring of the key gold-catalysed cyclisation step reveals that a powerful catalyst deactivation process progressively attenuates the rate of catalyst turnover. The origins of the catalyst deactivation have been investigated, with an uncatalysed side-reaction, involving the substrate and the iodine(III) oxidant, identified as the source of a potent catalyst poison. The side reaction generates 1–4% of a diaryliodonium salt, and whilst this moiety is shown not to be an innate catalyst deactivator, when it is tethered to the arylsilane reactant, the inhibition becomes powerful. Kinetic modelling of processes run at two different catalyst concentrations allows extraction of the partitioning of the gold catalyst between the substrate and its diaryliodonium salt, with a rate of diaryliodonium salt generation consistent with that independently determined in the absence of catalyst. The high partition ratio between substrate and diaryliodonium salt (5/1) results in very efficient, and ultimately complete, diversion of the catalyst off-cycle. Graphical Abstract

scholarly journals Kinetics of the reaction of SiO(g) with carbon saturated iron

1985 ◽  
Vol 16 (4) ◽  
pp. 857-857
Author(s):  
B. Ozturk ◽  
R. J. Fruehan
Keyword(s):  
Kinetics Of ◽  
Carbon Saturated Iron

The mechanism of sulphur transfer between carbon-saturated iron and CaO-SiO2-Al2O3 slags

JOM ◽  
1950 ◽  
Vol 2 (9) ◽  
pp. 1111-1119 ◽  
Author(s):  
G. Derge ◽  
W. O. Philbrook ◽  
Kenneth M. Goldman
Keyword(s):  
Carbon Saturated Iron

scholarly journals Distribution Ratio of Sulfur between CaO-SiO2-Al2O3-Na2O-TiO2 Slag and Carbon-Saturated Iron

Metals ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 1068 ◽  
Author(s):  
Kanghui Zhang ◽  
Yanling Zhang ◽  
Tuo Wu
Keyword(s):  
Experimental Data ◽  
Distribution Ratio ◽  
Hot Metal ◽  
Tio2 Content ◽  
Na2o Content ◽  
Sulfur Distribution ◽  
Reducing Conditions ◽  
Hot Metal Desulfurization ◽  
Sulfur Distribution Ratio ◽  
Carbon Saturated Iron

To explore the feasibility of hot metal desulfurization using red mud, the sulfur distribution ratio (LS) between CaO-SiO2-Al2O3-Na2O-TiO2 slag and carbon-saturated iron is evaluated in this paper. First, the theoretical liquid areas of the CaO-SiO2-Al2O3 (-Na2O-TiO2) slag are discussed and the fluxing effects of Al2O3, Na2O, and TiO2 are confirmed. Then, LS is measured via slag-metal equilibrium experiments. The experimental results show that LS significantly increases with the increase of temperature, basicity, and Na2O content, whereas it decreases with the increase of Al2O3 and TiO2 content. Na2O in the slag will volatilize with high temperatures and reducing conditions. Furthermore, based on experimental data for the sulfur distribution ratio between CaO-SiO2-Al2O3-Na2O-TiO2 slag and the carbon-saturated iron, the following fitting formula is obtained: log L S = 45.584 Λ + 10568.406 − 17184.041 Λ T − 8.529

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