Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 6
Book Description
United States Patent : US3558288 : Extraction of Metal Ions from Acidic Aqueous Solution Using an Amine and a Carboxylic Acid
Author: United States Patent : US2909542 : Use of Amidoximes in Solvent Extraction of Metal Ions from Solutions
Author: United States Patent : US6113804 : Composition and Use of the Composition for the Extraction of Metals from Aqueous Solution
Author: United States Patent : US4664700 : Selective Extraction of Metal Ions with Polymeric Extractions by Ion Exchange/redox
Author: Selective Solvent Extraction Using Organophosphorus and Carboxylic Acids
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
A process for the extraction of metal values, in particular divalent metal ions such as copper, nickel, cobalt and manganese from aqueous solutions thereof which may be well in the acid range for example of pH 2 to 4. Extraction is effected using known organophosphorus or carboxylic acid extractants but in combination with non-chelating oximes, preferably of aldehydes wherein the alpha-carbon atom is primary or secondary. A synergistic effect between the extractant and oxime enables extraction to take place at a lower pH than heretofore thereby saving in acid and neutralizing agents in many instances particularly in the case of extraction from acidic leach liquors.
Novel Regenerated Solvent Extraction Processes for the Recovery of Carboxylic Acids Or Ammonia from Aqueous Solutions Part II. Recovery of Ammonia from Sour Waters
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 148
Book Description
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.g. CO2 and H2S) from industrial sour waters. The recovery of carboxylic acids from dilute aqueous solution can be achieved by extraction with tertiary amines. 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, SUCCiOlC acid, and fumaric acid. Equilibrium data show near-stoichiometric recovery of the carboxylic acids from an organic solution of Alamine 336 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. 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 (0.2N) in Norpar 12. The concentration-based distribution ratios increase from 0.11 to 0.46 as the aqueous phase pH increases from 7.18 to 8.15. Regeneration of the organic extractant solution was carried out by stripping at elevated temperatures to remove the ammonia, with 99% recovery of the ammonia being obtained at 125 C.
Solvent Extraction
Author: G. M. RitceyPublisher:
ISBN:
Category : Science
Languages : en
Pages : 386
Book Description
United States Patent : US4288413 : Separating Molybdenum Values from an Aqueous Solution Containing Tungsten by Solvent Extraction
Author: United States Patent : US4278640 : Method for Solvent Extraction of Metallic Minerals Values from Acidic Solutions
Author: Solvent Extraction Chemistry of Metals
Author: Herbert Alwyn Cochrane McKayPublisher:
ISBN:
Category : Extraction (Chemistry)
Languages : en
Pages : 480
Book Description