Temperature Variation in Transference Numbers of Concentrated Solutions of Sulfuric Acid as Determined by the Galvanic Cell Method1

1935 ◽  
Vol 57 (4) ◽  
pp. 662-667 ◽  
Author(s):  
Walter J. Hamer
Keyword(s):  
Sulfuric Acid ◽  
Temperature Variation ◽  
Galvanic Cell ◽  
Transference Numbers ◽  
Concentrated Solutions

THE INFLUENCE OF GELATIN ON THE TRANSFERENCE NUMBERS OF SULFURIC ACID.

1921 ◽  
Vol 43 (10) ◽  
pp. 2161-2171 ◽  
Author(s):  
Alfred L. Ferguson ◽  
Wesley G. France
Keyword(s):  
Sulfuric Acid ◽  
Transference Numbers

scholarly journals Diffusion of Sulfuric Acid in Concentrated Solutions

1993 ◽  
Vol 140 (8) ◽  
pp. 2217-2221 ◽  
Author(s):  
Shigeru Umino ◽  
John Newman
Keyword(s):  
Sulfuric Acid ◽  
Concentrated Solutions

scholarly journals Study of Cellulose Interaction with Concentrated Solutions of Sulfuric Acid

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Michael Ioelovich
Keyword(s):  
Sulfuric Acid ◽  
High Power ◽  
Room Temperature ◽  
Regenerated Cellulose ◽  
Structure And Properties ◽  
Optimal Conditions ◽  
Initial Sample ◽  
Concentrated Solutions ◽  
Crystallinity Degree ◽  
20 Nm

The effect of the concentration of sulfuric acid (SA) and temperature on structure and properties of cellulose (MCC) had been studied. Investigations showed that solubility of the initial sample at the room temperature increased gradually in the range of the acid concentration from 50 to 60 wt.% SA. When SA concentration reached 65 wt.%, then MCC sample dissolved completely. Cellulose regenerated from 65 wt.% SA had an amorphized structure and was characterized by high enzymatic digestibility. At increased temperature, 45°C, solubility of MCC in SA was raised, while yield and DP decreased. After treatment of MCC with hot 50–60 wt.% SA, the crystallinity degree of the obtained cellulose samples changed slightly, and these samples retained mainly the CI crystalline polymorph. However, when SA concentration reached 65 wt.%, then regenerated cellulose had CII crystalline polymorph, reduced crystallinity degree, and low DP. Using optimal conditions of the acidic treatment (57–60 wt.% SA, T = 45°C; t=1 h) in combination with the high-power disintegration permitted obtaining the CI nanocrystalline cellulose particles (NCP) having sizes 150–200 × 10–20 nm with the heightened yield (65–70%). These NCP can be used, for example, as reinforcing nanofillers for various composites.

Resolution of Raman spectra of aqueous sulfuric acid mixtures using principal factor analysis

1981 ◽  
Vol 59 (17) ◽  
pp. 2591-2598 ◽  
Author(s):  
Robin A. Cox ◽  
Ülo L. Haldna ◽  
K. Loralee Idler ◽  
Keith Yates
Keyword(s):  
Factor Analysis ◽  
Sulfuric Acid ◽  
Raman Spectra ◽  
Ion Pair ◽  
Medium Composition ◽  
Principal Factor ◽  
Water Molecules ◽  
Concentrated Solutions ◽  
Principal Factor Analysis ◽  
Hydrated Ion

Principal factor analysis has been applied to Raman spectra of 26 sulfuric acid/water mixtures covering the 0–100% H2SO4 concentration range. The analysis greatly facilitates the identification of peaks due to different species. The results show that SO42− ions and "free" HSO4− ions do not co-exist with undissociated H2SO4 molecules in solution and that two water molecules rather than one are required for the first ionization of H2SO4. A species with the composition H2SO4•2H2O, assigned a hydrated ion pair structure, reaches maximum concentration at the same medium composition at which SO42−, free HSO4−, and H2SO4 are at concentration minima, about 75% w/w. The only species apparent in the more concentrated solutions are the ion pair and undissociated H2SO4, which could be taken to mean that H2SO4 is a weaker acid than H3O+, but a stronger one than H3O+•H2O (or H5O2+, if this entity has a real existence). Separate peaks due to the postulated H3O+•H2SO4 (or H5SO5+) were not observed.

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