Two novel regenerated solvent extraction processes are examined. The first process has the potential to reduce the energy costs inherent in the recovery of low-volatility carboxylic acids from dilute aqueous solutions. The second process has the potential for reducing the energy costs required for separate recovery of ammonia and acid gases e. The recovery of carboxylic acids from dilute aqueous solution can be achieved by extraction with tertiary amines.
Solvent extraction of gold from chloride solution
An approach for regeneration and product recovery from such extracts is to back-extract the carboxylic acid with a water-soluble, volatile tertiary amine, Poole, L. March 1, It has been viewed times. More information about this document can be viewed below. People and organizations associated with either the creation of this thesis or dissertation or its content. Serving as both a federal and a state depository library, the UNT Libraries Government Documents Department maintains millions of items in a variety of formats.
New PhD on cobalt & rare-earth solvent extraction
Descriptive information to help identify this thesis or dissertation. Follow the links below to find similar items on the Digital Library. An approach for regeneration and product recovery from such extracts is to back-extract the carboxylic acid with a water-soluble, volatile tertiary amine, such as trimethylamine. The resulting trimethylammonium carboxylate solution can be concentrated and thermally decomposed, yielding the product acid and the volatile amine for recycle.
Experimental work was performed with lactic acid, succinic acid, and fumaric acid. Equilibrium data show near-stoichiometric recovery of the carboxylic acids from an organic solution of Alamine into aqueous solutions of trimethylamine. For fumaric and succinic acids, partial evaporation of the aqueous back extract decomposes the carboxylate and yields the acid product in crystalline form. The decomposition of aqueous solutions of trimethylammonium lactates was not carried out to completion, due to the high water solubility of lactic acid and the tendency of the acid to self-associate.
Peter Tom Jones
The separate recovery of ammonia and acid gases from sour waters can be achieved by combining steam-stripping of the acid gases with simultaneous removal of ammonia by extraction with a liquid cation exchanger. The use of di-2,4,4-trimethylpentyl phosphinic acid as the liquid cation exchanger is explored in this work. Batch extraction experiments were carried out to measure the equilibrium distribution ratio of ammonia between an aqueous buffer solution and an organic solution of the phosphinic acid 0.
The concentration-based distribution ratios increase from 0. Unique identifying numbers for this document in the Digital Library or other systems. Reports, articles and other documents harvested from the Office of Scientific and Technical Information. What responsibilities do I have when using this thesis or dissertation?
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Other portions of these samples were separated by column chromatography with subsequent analysis by infrared, visible, ultraviolet, and mass spectroscopy. The proximity of the Hanford Atomic Product Operations to the collecting area caused some of the organics to be labeled with trace amounts of radionuclides.
Project thesis Refining of used motor oil using Solvent Extraction
The organic solvent, hexone, used in this extraction was distilled before and after the extraction with various fractions of solvent being kept for control. The extraction was carried out under varying chemical and physical conditions. The hexone was back-extracted into hydrochloric acid, sodium bicarbonate, or sodium hydroxide before analysis by flame-ionization gas chromatography and mass spectroscopy. Other portions of the product hexone were analyzed for total solid matter recovered and carbon, hydrogen, and nitrogen content.
Small intermediate scale extractions were carried out in the laboratory using several solvents. Resulting organic material was analyzed by tandem gas chromatography-mass spectroscopy.
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Where possible, organic derivatives were prepared to aid in the identification of the recovered organic material. The advantages and disadvantages of large scale extractions and small laboratory procedures were discussed. CVista PdfCompressor 4. Relationships Parents: This work has no parents. Cronin, John Thomas, Manual and automatic solvent extraction techniques were used to concentrate organic material from natural waters.
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Doctor of Philosophy Ph. Oregon State University. Forster, William O.
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