Equilibria in complexes of N-heterocyclic molecules. XVII. Covalent hydration and the rate of dissociation of the Bis(2,2':6',2'-terpyridyl)iron(III) ion in acid solution

1978 ◽  
Vol 31 (9) ◽  
pp. 1959 ◽  
Author(s):  
WS Walters ◽  
RD Gillard ◽  
PA Williams
Keyword(s):  
Sulfuric Acid ◽  
Acid Solution ◽  
Dissociation Process ◽  
Heterocyclic Molecules ◽  
Essential Step ◽  
Aqueous Sulfuric Acid ◽  
Rate Of Reaction

The dissociation of Fe(tpy)23+ has been studied in aqueous sulfuric acid. The rate of reaction increases upon addition of small amounts of acid, reaches a maximum, and then falls to zero in a complex fashion as the acid approaches limiting concentration, and aH2O falls to zero. No dissociation occurs in the absence of water, and it is evident that covalent hydration of the complex is an essential step in the dissociation process.

Highly gas permselective polyetherketone hollow fibre membranes using aqueous sulfuric acid solution as coagulant

e-Polymers ◽  
2007 ◽  
Vol 7 (1) ◽  
Author(s):  
Jiping Yang ◽  
Philip J Brown
Keyword(s):  
Mechanical Properties ◽  
Sulfuric Acid ◽  
Acid Solution ◽  
Gas Separation ◽  
Sulfuric Acid Solution ◽  
Hollow Fibre ◽  
Injection Rate ◽  
Fluid Injection ◽  
Aqueous Sulfuric Acid ◽  
Membrane Morphology

AbstractHollow fibre membranes with more sponge-like morphology and improved gas permeation performance were spun from 20% polyetherketone (PEK) /sulfuric acid (H2SO4) dope solution with aqueous sulfuric acid solution as coagulant using dry-jet wet spinning process. The membrane morphology, mechanical properties and gas separation performance (hydrogen, methane and carbon dioxide) of as-spun PEK hollow fibres have been measured using SEM, Instron and gas test rig. Better cross section structures and mechanical properties in as-spun PEK hollow fibres were observed when aqueous sulfuric acid solution replaced water as coagulant (internal and external). The hydrogen/methane selectivity of up to 40 and hydrogen permeation rate of 3.65 GPU obtained in PEK hollow fibre membranes using 30% sulfuric acid solution as internal and external coagulant simultaneously at the bore fluid injection rate of 30 ml/h are higher than those reported in literatures. Furthermore the effects of bore fluid injection rate and various coagulants on the membrane morphology, mechanical properties and gas separation properties were investigated, as well.

The Reaction of Glycidic Esters with Thiourea in Aqueous Sulfuric Acid Solution

1959 ◽  
Vol 81 (8) ◽  
pp. 1943-1946 ◽  
Author(s):  
John A. Durden ◽  
Harry A. Stansbury ◽  
William H. Catlette
Keyword(s):  
Sulfuric Acid ◽  
Acid Solution ◽  
Sulfuric Acid Solution ◽  
Aqueous Sulfuric Acid
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