Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 118 for “"phosphoric acid"”.
-
PHOSPHORIC ACID CONDENSATIONS WITH TRICHLOROACETONITRILE.
PHOSPHORIC ACID CONDENSATIONS WITH TRICHLOROACETONITRILE.
-
Solvent extraction of phosphoric acid
This work investigated the purification of phosphoric acid using a suitable organic solvent, followed by re-extraction of the acid from the solvent using water. The work consisted of practical batch and continuous studies and the economics and design of a full scale plant, based on the experimental …
-
Purification of phosphoric acid by solvent extraction
… that a process for purifying wet-process phosphoric acid by solvent extraction should be economically viable. The work was divided into two main areas, (i) chemical and physical measurements on the three-phase system, with or without impurities; (ii) process simulation and optimization. …
-
Kinetics of dissolution of cuprite in phosphoric acid
Includes bibliographical references.
-
Anodic dissolution and electropolishing of copper in phosphoric acid
… with the electrochemical dissolution of Cu in phosphoric acid. The investigation employs not only standard electrochemical methods, but also the purely physical methods of microscopy and schlieren analysis.
-
Magnetic gels for uranium recovery from wet phosphoric acid
Incorporation of uranium recovery into wet phosphoric acid (WPA) processes can potentially supplement a significant portion of the world's uranium production and simultaneously benefit human health and environment by reducing radiological and toxic contamination of the phosphate fertilizer …
-
The synthesis, spectroscopy and fungicidal activity of phosphoric acid amides
The reaction between N,N,N‘,N'-tetramethylphosphoric triamide (TMPT) and chloral has been shown to give chloroform, dimethylformamide, (Me2N)2P(0)NHCH(CCl,)NMe2 and polymeric phosphorus containing compounds. A possible mechanism for the formation of these products is given.
-
A Study of the Ferrous-Ferric System in Phosphoric Acid
… purpose of this paper to show the effect of orthophosphoric acid on the oxidation-reduction potential of the ferrous-ferric system by using methods of procedure and apparatus that are easily reproducible under laboratory conditions. |In the media of various concentrations of orthophosphoric acid, …
-
Structure and reactivity of cyclic imido derivatives of phosphoric acid
… initial C-N cleavage, followed by ring closure Acidolysis studies were carried out in anhydrous TFA. These studies indicated that the low reactivity towards nucleophilic attack of 2-amino (23), 2-methylamino (24),2-dimethylamino (25) and 2- p-anisidino (43) derivatives may also be accounted for …
-
The Formal Oxidation-Reduction Potentials of Ferric-ferrous in Phosphoric Acid
… (12), hydrochloric (13), sulfuric (15), and phosphoric (l) acids. The acids are named in the order of increasing extent to which the oxidation potential of the ferric-ferrous system is lowered in the presence of the acid. These formal potentials are more practical than the standard potentials …
-
Fabrication of carbon-aerogel electrodes for use in phosphoric acid fuel cells
… fabricate carbon aerogel electrodes for use in a phosphoric acid fuel cell (PAFC). It was found that the use of a 25% solution of the surfactant Cetyltrimethylammonium chloride (CTAC) in water resulted in the creation of micelle within the pores of the organic aerogel. The micelle allowed the …
-
Phosphoric acid as an eka-catalyst in the alkylation of pipe still vapors
… the presence of various concentrations of ortho-phosphoric acids and mixtures of ortho-phosphoric acid and hydrochloric and sulfuric acids as catalyst was investigated. Physical conditions studied were (1) temperature ranging from 40 to 200°C., (2) length of run from six to eight hours, and (5) …
-
Development and Application of Computational Methods for the Prediction of Chiral Phosphoric Acid Catalyst Performance
Chiral phosphoric acids are bifunctional catalysts that have the ability to activate electrophiles and nucleophiles through hydrogen bonding, and they have been successful in catalysing highly enantioselective additions of a wide range of nucleophiles to imines. In most literature reports it is not …
-
The effect of certain nitrogen-containing organic compounds on the corrosion of steel in phosphoric acid
… to inhibit the corrosion of steel in 5 percent phosphoric acid at 25°C. and under the conditions of aeration and agitation used. 3. Sodium chromate is an inhibitor in concentrations of 1 percent for the corrosion of steel by a 5 percent, aerated, agitated, phosphoric acid solution at 25°C. 4. …
-
Syntheses of selected mono- and di-esters of phosphoric acid and stability constants of their copper (II) complexes
A number of different routes were attempted to the syntheses of organic phosphate models (R₁O)(R₂O)PO; where R₁ = 4-nitrophenyl group and R₂ = benzyl, 2-pyridylmethyl, 1-naphthylor 8-quinolyl group. However, preparative difficulties and side reactions, due mainly to the susceptibility of the …
-
Crystallization of calcium sulphate during phosphoric acid production : improving filtration through improvement in particle shape and size distribution
The production of phosphoric acid from phosphate mineral rock involves the addition of phosphate rock to a concentrated sulfuric acid solution. The induced reactive crystallization process produces a side product of calcium sulfate hydrates, which become the filter media in the subsequent acid …
Page 1 of 6