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| Number | Title | Issue Date |
| 4405574 | Removal of Mg++ and Ca++ ions from NaCl brine Alkaline earth metal ions, e.g., Mg++ and/or Ca++, are removed from alkali metal brines, e.g., NaCl, by use of a particulate, macroporous, anion exchange resin containing the in-situ reaction product of polymeric, amorphous, hydrous ... | 09/20/1983 |
| 4364909 | Removal of Ca++ from MgCl2 Removal of Ca++ values from MgCl2 brine is accomplished by use of a crystalline zeolite structure of the empirical formula Na12 [(AlO2)12 (SiO2)12 ].nH2 O, where nH2 | 12/21/1982 |
| 4334999 | Process for the extraction of metal ions A process for extracting metal ions from a water insoluble metal base or salt dispersed in an aqueous solution using liquid ion exchange is described. The liquid ion exchange extractant is an alkyl phosphoric acid or acid phosphate (APA) which is dissolve... | 06/15/1982 |
| 4324771 | Alcohol & hydroxyoxime extractant for boron & calcium from brines Boron and calcium are removed from brines with use of a mixture of from about 0.8 to 15 volume percent of an -hydroxy oxime extractant having the general formula: ##STR1## where R and R' are hydrocarbon radicals and R" is hydrogen or a hy... | 04/13/1982 |
| 4291001 | Recovery of lithium from brine Improvements are made in the process wherein Li+ values are recovered from dilute aqueous solution by the use of an anion exchange resin composite containing crystalline LiX.2Al(OH)3, where X is halide. The improvements derive from e... | 09/22/1981 |
| 4287071 | Simultaneous extraction of more than one ion by liquid membrane process A liquid membrane process for removing ions from solution which comprises contacting a solution containing a first ion and a second ion with an emulsion, said emulsion comprising an external phase which is immiscible with said solution and contains a firs... | 09/01/1981 |
| 4243641 | Method for recovering lithium from sea water A process for recovering lithium from sea water in which sea water is repeatedly concentrated at specific gravities between 1.13 and 1.24 to thereby separate salts including common salt from the concentrate, removing the salts which separate from the conc... | 01/06/1981 |
| 4243555 | Composition for recovery of MG++ from brines Magnesium values are selectively recovered from salt brines, even salt brines which contain competing ions such as Li+, Ca++, and Sr++, by contacting the brine with an anion exchange resin which has dispersed therein a mic... | 01/06/1981 |
| 4233273 | Selective extraction of iron and aluminum from acidic solutions A method is provided for extracting at least one of the trivalent ions Fe and Al from an acid solution. The method comprises uniformly mixing the acid solution with a liquid organic extractant comprising an organophosphorus compound and an alkylaromatic s... | 11/11/1980 |
| 4215009 | Purification method A novel method of reducing metal impurities in aqueous alkali metal halide solutions, especially alkaline earth metal ions, and to novel organic solvent compositions having a synergistic activity for removal of metal impruties from aqueous solutions.... | 07/29/1980 |
| 4183900 | Recovery of Mg++ from brines Magnesium values are selectively recovered from salt brines, even salt brines which contain competing ions such as Li+, Ca++, and Sr++, by contacting the brine with an anion exchange resin which has dispersed therein a mic... | 01/15/1980 |
| 4108958 | Extraction of Cu(II), Fe(III), Ni(II), Co(II), Cd(II), Zn(II), Ca(II) and Mg(II) metal values using 2-hydroxy iminoacetic acids Novel 2-hydroxyiminoacetic acids of the formula ##STR1## where R is an aromatic hydrocarbyl group substituted with one or more aliphatic chains of at least four carbon atoms are excellent for the extraction of metal values from acidic metal - contain... | 08/22/1978 |
| 4078978 | Purification of electrolysis brine for diaphragm cells In the electrolysis of an alkaline earth metal-containing alkali metal brine wherein the alkaline earth metals contained in the brine are removed, the brine is subjected to electrolysis, and the residual brine is concentrated and recycled for further elec... | 03/14/1978 |
| 4058585 | Solvent extraction of metals from acidic solutions with quaternary ammonium salts of hydrogen ion exchange agents Process of extracting metals using organic solvent solutions of salts of hydrogen ion exchange agents and quaternary ammonium compounds. Organic solvent solutions of such quaternary ammonium salts of hydrogen ion exchange agents.... | 11/15/1977 |
| 4053564 | Extraction process for purification of phosphoric acid Water immiscible organic acid phosphates used in conjunction with water immiscible organic sulfonic acids results in an improved process for the purification of phosphoric acid. An increase in the extraction of ionic metallic impurities and a decrease in ... | 10/11/1977 |
| 4051223 | Process for the recovery of magnesium Magnesium values are selectively extracted from aqueous solutions thereof also containing calcium using quaternary ammonium salts of selected hydrogen ion exchange reagents. Magnesium is stripped from the resulting organic phase with acids.... | 09/27/1977 |
| 3988420 | Processes for the manufacture of feed-grade dicalcium phosphate and phosphoric acid The invention relates to a combined process for the manufacture of feed grade dicalcium phosphate and pure phosphoric acid. The process comprises the reaction of an excess of phosphate rock with aqueous solutions of a mineral acid selected from hydrochlor... | 10/26/1976 |
| 3965238 | Method of recovering uranium Uranium values are obtained from phosphate rock by acidifying phosphate rock containing uranium values and at least one other heavy metal with a mineral acid so as to obtain a crude acid, solvent extracting the crude acid with an organic solvent so as to ... | 06/22/1976 |
| 3960888 | Pyrrolidone-5,5-diphosphonic acids Pyrrolidone-5,5-diphosphonic acids having the formula ##EQU1## wherein R is a member selected from the group consisting of hydrogen and alkyl having from 1 to 6 carbon atoms; as well as their water-soluble salts. The pyrrolidone-5,5-diphosphonic acid... | 06/01/1976 |
| 3956472 | Removal of boron from magnesium chloride brines Minute amounts of boron present in naturally occuring brines found in oceans, inland seas, salt lake and the like are removed by treating the brine with a fluoride ion.... | 05/11/1976 |
| 3953568 | Method of simultaneous concentration and dilution of isotopes A method of simultaneously obtaining separate enriched fractions of heavier and lighter isotopes from mixtures thereof with the use of an ion exchange resin column by passing a ligand body containing this isotope mixture through the column. The isotopes, ... | 04/27/1976 |
| 3937667 | Processes for separating metals In conventional processes for separating metals by selective precipitation, the precipitate is frequently in an amorphous form, eg a slime, which is difficult to filter, wash and handle generally. In the present process mixed solutions and/or sols of the ... | 02/10/1976 |
