Stereoregular polymerization of vinyl alkyl ethers with metal sulfate–sulfuric acid complex catalysts

1964 ◽  
Vol 2 (8) ◽  
pp. 3369-3386 ◽  
Author(s):  
Joginder Lal ◽  
James E. McGrath
Keyword(s):  
Sulfuric Acid ◽  
Metal Sulfate ◽  
Acid Complex ◽  
Alkyl Ethers ◽  
Stereoregular Polymerization

scholarly journals I. The Polymerization of Isobutyl Vinyl Ether Catalyzed by Metal Sulfate-Sulfuric Acid Complexes

1961 ◽  
Vol 18 (197) ◽  
pp. 561-566 ◽  
Author(s):  
Hitoshi Yamaoka ◽  
Toshinobu Higashimura ◽  
Seizo Okamura
Keyword(s):  
Sulfuric Acid ◽  
Vinyl Ether ◽  
Metal Sulfate

Hydration of a sulfuric acid–oxalic acid complex: acid dissociation and its atmospheric implication

RSC Advances ◽  
2015 ◽  
Vol 5 (60) ◽  
pp. 48638-48646 ◽  
Author(s):  
Shou-Kui Miao ◽  
Shuai Jiang ◽  
Jiao Chen ◽  
Yan Ma ◽  
Yu-Peng Zhu ◽  
...  
Keyword(s):  
Density Functional Theory ◽  
Sulfuric Acid ◽  
Oxalic Acid ◽  
Density Functional ◽  
Structural Characteristics ◽  
Acid Dissociation ◽  
Acid Complex ◽  
Functional Theory ◽  
Insight Into

We have investigated structural characteristics and thermodynamics of the hydration of a sulfuric acid–oxalic acid complex using density functional theory to gain insight into the ternary nucleation and its atmospheric implication.

The Salt Makers

2019 ◽  
Author(s):  
Peter Wothers
Keyword(s):  
Organic Matter ◽  
Sulfuric Acid ◽  
Nitric Acid ◽  
Hydrochloric Acid ◽  
Acid Solution ◽  
Periodic Table ◽  
Dilute Hydrochloric Acid ◽  
Common Salt ◽  
Distilled Water ◽  
Metal Sulfate

This chapter looks at the elements from the penultimate group of the periodic table—the halogens (‘salt-formers’). We shall see that the first of these elements was discovered by Scheele during his investigations of the mineral pyrolusite. Lavoisier knew of the element but he failed to recognize it as such since he was convinced the gas had to contain oxygen and so must be a compound. It was left to Davy to prove that this was not so, which led to the English chemist naming this element that had been discovered (but not properly named) over thirty years before by the great Scheele. Davy’s choice was to influence the names given to all the members of this group, including the most recent member named in 2016. There are three common acids known as mineral acids, since they may all be obtained by heating combinations of certain minerals. Their modern names are nitric acid, sulfuric acid, and hydrochloric acid. Of these three, hydrochloric was probably the last to be discovered. Nitric and sulfuric acids were obtained in the thirteenth or early fourteenth centuries, but the earliest unambiguous preparation of relatively pure hydrochloric acid is from a hundred years later, in a manuscript from Bologna which translates as Secrets for Colour. It gives a curious recipe for a water to soften bones: ‘Take common salt and Roman vitriol in equal quantities, and grind them very well together; then distil them through an alembic, and keep the distilled water in a vessel well closed.’ As we saw in Chapter 3, ‘Roman vitriol’ is a hydrated metal sulfate, probably iron or copper sulfate; its mixture with salt, when heated, produces water and hydrogen chloride, which together form the acid solution. Later texts from the sixteenth and seventeenth centuries include similar methods to prepare this so-called spirit of salt, or ‘oyle of salt’. The first mentioned use, to soften bones, is indeed best achieved with hydrochloric acid, which readily dissolves the minerals from bone to leave only the organic matter largely intact. Leave a chicken bone in dilute hydrochloric acid for a few hours, and it may easily be bent without breaking.

scholarly journals High Temperature Pressure Oxidation of a Low-Grade Nickel Sulfide Concentrate with Control of the Residue Composition

Minerals ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 249 ◽  
Author(s):  
Robbie G. McDonald ◽  
Jian Li ◽  
Peter J. Austin
Keyword(s):  
Sulfuric Acid ◽  
High Temperature ◽  
Iron Sulfide ◽  
Iron Sulfate ◽  
Low Grade ◽  
Metal Sulfate ◽  
Pressure Oxidation ◽  
Potential Benefits ◽  
Sulfide Content ◽  
Oxidative Transformations

High temperature pressure oxidation of a low-grade nickel concentrate was examined to demonstrate the potential benefits and shortcomings of this approach. The high iron sulfide content ensured that acid generation was much greater than for higher grade concentrates. This results in the formation of basic iron sulfate phases and a significant amount of sulfuric acid. Kinetic sampling during pressure oxidation tests also demonstrated the transformation of sulfide minerals, including the oxidative transformations of pentlandite to violarite and then to vaesite, the latter phase not previously noted in studies of this kind. Finally, addition of a divalent metal sulfate buffer, here magnesium sulfate, mitigates the formation of basic iron sulfates but with greater generation of sulfuric acid in the leach liquor. Under the conditions employed in this study, this acid could be employed to leach other nickel-containing materials such as nickel laterites.

scholarly journals Bound Ascorbic Acid in Acerola Juice

1969 ◽  
Vol 41 (2) ◽  
pp. 134-139
Author(s):  
Alice Del Campillo ◽  
Conrado F. Asenjo
Keyword(s):  
Ascorbic Acid ◽  
Absorption Spectrum ◽  
Sulfuric Acid ◽  
Acid Complex ◽  
Fresh Frozen ◽  
Spectrum Curve ◽  
Insoluble Precipitate

1. Acerola juice, fresh, frozen, or canned, was found to contain in the neighborhood of 0.22 percent by weight of an alcohol-insoluble precipitate containing bound ascorbic acid. This precipitate contained about 1.25 percent of nitrogen. 2. Of the total ascorbic acid in acerola juice 0.18 percent was in the bound form. 3. The bound ascorbic acid liberated was characterized by means of the absorption spectrum curve of its osazone-sulfuric acid complex.

Preparation of Thin Cadmium Telluride Samples for Electron Microscope Studies

1974 ◽  
Vol 32 ◽  
pp. 548-549
Author(s):  
T. J. Magee ◽  
J. Peng ◽  
J. Bean
Keyword(s):  
Electron Microscope ◽  
Sulfuric Acid ◽  
Solid State ◽  
Sample Preparation ◽  
Cadmium Telluride ◽  
Potassium Dichromate ◽  
Optical Components ◽  
The Past ◽  
Solid State Devices

Cadmium telluride has become increasingly important in a number of technological applications, particularly in the area of laser-optical components and solid state devices, Microstructural characterizations of the material have in the past been somewhat limited because of the lack of suitable sample preparation and thinning techniques. Utilizing a modified jet thinning apparatus and a potassium dichromate-sulfuric acid thinning solution, a procedure has now been developed for obtaining thin contamination-free samples for TEM examination.

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