Kinetics of the cyclodehydration and hydrolysis of 2'amino- and 2', 4'-diaminobenzanilides in aqueous sulfuric acid solution

1979 ◽  
Vol 28 (5) ◽  
pp. 902-908
Author(s):  
V. K. Shchel'tsyn ◽  
T. P. Shapirovskaya ◽  
M. I. Vinnik
Keyword(s):  
Sulfuric Acid ◽  
Acid Solution ◽  
Sulfuric Acid Solution ◽  
Aqueous Sulfuric Acid ◽  
Kinetics Of ◽  
Hydrolysis Of

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.

Rate of the Bromous Acid-Bromide Reaction Measured in a Br2-HOBr Buffer System in Sulfuric Acid Solution

1989 ◽  
Vol 44 (6) ◽  
pp. 555-566
Author(s):  
Horst-Dieter Försterling ◽  
Szilvia Murányi ◽  
Helmut Schreiber
Keyword(s):  
Sulfuric Acid ◽  
Acid Solution ◽  
Rate Constant ◽  
Sulfuric Acid Solution ◽  
Solubility Product ◽  
Oxidation States ◽  
Buffer System ◽  
Direct Information ◽  
Hypobromous Acid ◽  
Hydrolysis Of

In the Belousov-Zhabotinsky system bromine species of oxidation states - 1 to 5 are important for the start and for the inhibition of the autocatalytic reaction steps. Especially, the reaction of Br- with HBrO2 competes with the oxidation of Ce3+ by BrO2 formed from HBrO2 and HBrO3. In our investigation the reaction of Br- with HBrO2 (solvent 1 M sulfuric acid) is followed spectroscopically in a mixture of bromine and hypobromous acid, which system works as a buffer for bromide. Including experiments on the hydrolysis of Br2 and on the solubility product of AgBr in 1 M sulfuric acid solution direct information about the rate constant kl of the Br-/HBrO2 reaction is obtained (k1 = 2.5 × 106 M-2 s-1 at 20 °C and 4× 106 M-2 s-1 at 25°C, which values are valid in the range of 0.01 to 1 M sulfuric acid).

Uptake kinetics of three epoxides into sulfuric acid solution

2012 ◽  
Vol 56 ◽  
pp. 58-64 ◽  
Author(s):  
Tianhe Wang ◽  
Ze Liu ◽  
Weigang Wang ◽  
Maofa Ge
Keyword(s):  
Sulfuric Acid ◽  
Acid Solution ◽  
Sulfuric Acid Solution ◽  
Uptake Kinetics ◽  
Kinetics Of
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