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...When G.G. Hubbard learned of his future son-in-law's invention, he called it "only a toy." His daughter was engaged to a young man named Alexander Graham Bell.
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| Number | Title | Issue Date |
| 7077968 | Method for continuously filtering raw brine for use in chlor-alkali electrolysis The method of continuously processing raw brine with a solids content to obtain substantially solids-free pure brine (E) for use in chlor-alkali electrolysis. In this method the raw brine (A) is separated, by means of a decanter (1), into a clear brine (B) wi... | 07/18/2006 |
| 7067094 | Process for the brightening of sodium hydrogensulfate The process for the brightening of continuously produced sodium hydrogensulfate obtained in the reaction of sodium chloride and concentrated sulfuric acid in molten sodium hydrogensulfate in a circulation reactor, wherein evolved hydrogen chloride and heating gases ... | 06/27/2006 |
| 7041268 | Process for recovery of sulphate of potash The present invention is directed to a novel integrated process for the recovery of sulphate of potash (SOP) from sulphate rich bittern. The process requires bittern and lime as raw materials. Kainite type mixed salt is obtained by fractional crystallization of the ... | 05/09/2006 |
| 6986878 | Method of producing potassium sulfate via cation exchange A process for producing potassium sulfate from potash and sodium sulfate, which involves providing a source of sodium sulfate and passing the sodium sulfate through cationic exchanger. Eluted potassium sulfate containing sodium sulfate is reacted with potash to form... | 01/17/2006 |
| 6962662 | Process for treating lightly contaminated acid mine water A process for removing metal sulfates from dilute aqueous solutions in which a conductivity control solution is injected into the stream. The solution is selected to increase the conductivity of the stream to a value wherein the ion state of each metal is then modif... | 11/08/2005 |
| 6767528 | Manufacture of hydrogen chloride from salt and sulfuric acid The specification discloses a continuous process for producing hydrogen chloride whereby sulfuric acid and an alkali metal chloride are fed to a direct fired reaction chamber in a molar ratio of approximately one to one, products comprising hydrogen chloride and the... | 07/27/2004 |
| 6676917 | Process for the production of hydrochloric acid and neutralized sulfates A process for the production of hydrochloric acid and neutralized sulfates comprising: reacting sulfuric acid with an alkaline metal chloride in order to obtain a liquor containing hydrochloric acid, an acid alkaline metal sulfate and an excess of sulfuri... | 01/13/2004 |
| 6365122 | Process for manufacturing potassium sulfate fertilizer and other metal sulfates A new process of preparing potassium sulfate fertilizer and other metal sulfates from the chlorides and other halides of these metals. The process utilizes the discovery that sulfur dioxide or trioxide, when introduced as a fluidizing medium into shallow ... | 04/02/2002 |
| 6334990 | Formulation of potassium sulfate, sodium carbonate and sodium bicarbonate from potash brine A process for the preparation of potassium sulfate, sodium bicarbonate and sodium carbonate. The process involves the treatment of potash brines by the reaction of sodium chloride and potassium chloride with calcium sulfate and sodium sulfate. Syngenite p... | 01/01/2002 |
| 6315976 | Method of producing potassium sulfate A process is provided for producing potassium sulfate by reacting ammonium sulfate and potassium chloride at a temperature of about 30 to 40° C. to produce a slurry containing K2 SO4.multidot.NH.sub.4.multidot.2SO.sub.4 double salt,... | 11/13/2001 |
| 6143271 | Process for producing potassium sulfate from potash and sodium sulfate The present invention provides a process for producing potassium sulfate from a potash and a sodium sulfate source, comprising the steps of: (a) treating a portion of the potash source and sodium sulfate source, such that glaserite is crystallized out of ... | 11/07/2000 |
| 5552126 | Co-production of potassium sulfate, sodium sulfate and sodium chloride A process for producing potassium sulfate, sodium sulfate, and sodium chloride from potash and a sodium sulfate/water source, which includes: (a) treating the sodium sulfate/water source to produce a slurry containing anhydrous sodium sulfate; (b) concent... | 09/03/1996 |
| 5549876 | Production of potassium sulfate using differential contacting A process for the manufacture of potassium sulfate from a sodium sulfate source, potash and water, comprising the steps of: (a) introducing the sodium sulfate source, water and potash into a differential countercurrent contactor; and (b) causing the sodiu... | 08/27/1996 |
| 5529764 | Co-production of potassium sulfate and sodium sulfate A process for producing potassium sulfate or potassium sulfate and sodium sulfate from potash and a sodium sulfate/water source, which includes: (a) subjecting a sodium sulfate source to conversion with potash in an aqueous medium to yield glaserite preci... | 06/25/1996 |
| 5518583 | Zero discharge mill distillation, salt recovery, and water management In minimizing effluents from a cellulose pulp mill, liquid effluents from a bleach plant are concentrated, and then incinerated to produce a residue including sodium, sulfate, and sodium chloride. This residue is distilled with sulfuric acid to produce ga... | 05/21/1996 |
| 5482696 | Method for the purification and/or electrolysis of an aqueous potassium chloride solution The present invention concerns a method for the purification and/or electrolysis of an aqueous potassium chloride solution, in which the sulphate ions are removed from the aqueous potassium chloride solution by precipitation as potassium sulphate and/or a... | 01/09/1996 |
| 4707347 | Process for the production of potassium sulfate from potassium chloride by means of ion exchangers A process is disclosed for the production of potassium sulfate from potassium chloride by means of a sulfate-laden anion exchanger, according to which as reaction solution, the exchanger is intensively contacted with a saturated potassium chloride solutio... | 11/17/1987 |
| 4588573 | Method for the production of potassium sulfate using sulfuric acid and potassium chloride Potassium chloride and sulfuric acid are reacted in a recycled aqueous solution in the stoichiometric ratio required for potassium sulfate production. Hydrogen chloride produced by the reaction of the potassium chloride and sulfuric acid is evaporated in ... | 05/13/1986 |
| 4562058 | Process for crystallizing potassium sulfate An improved process for the production of potassium sulfate crystals by the reaction of saturated solution of potassium chloride with langbeinite in the solid phase at a temperature of from 45°-55° C., thereby forming potassium sulfate crystals and magn... | 12/31/1985 |
| 4504458 | Gypsum conversion Gypsum as a byproduct in the manufacture of phosphoric acid is converted into potassium sulphate or sodium sulphate by subjecting an aqueous slurry to anion exchange under acidic conditions. Adding solid potassium chloride to the obtained solution of pota... | 03/12/1985 |
| 4436710 | Method of manufacturing potassium sulfate This improved method comprises a first dry step of reacting concentrated sulfuric acid and potassium sulfate with potassium chloride at about 300° C. in a slurried state to obtain a mixed slurried salts of Kn H2-n SO4 (n ... | 03/13/1984 |
| 4427637 | Apparatus for producing an alkali metal salt of a mineral acid, and a process An apparatus is disclosed for producing an alkali metal salt of a mineral acid, characterized by the provision of a specific agitating means, said agitating means having a pair of shafts adapted to contra-rotate and a plurality of columnar agitating eleme... | 01/24/1984 |
| 4420468 | Method of treating converted potassium sulfate for reducing a small amount of chlorine contained therein A small amount of chlorine contained in the converted potassium sulfate obtained by dry-mixing and heating potassium chloride with sulfuric acid or potassium hydrogensulfate can greatly be reduced by totally pulverizing the potassium sulfate to 60 mesh pa... | 12/13/1983 |
| 4406736 | Method of bleaching pulp with an aqueous solution of chlorine dioxide and chlorine followed by a chlorine solution The advantages of the serial application of chlorine dioxide and chlorine without intermediate wash during the bleaching of wood pulp in the absence of significant amounts of dissolved organic materials are improved by the presence of small quantities of ... | 09/27/1983 |
| 4371512 | Production of alkali metal sulfates Alkali metal sulfates are produced from an aqueous solution containing alkali metal hydrogen sulfate which comprises contacting the aqueous solution of alkali metal hydrogen sulfate with a hydrophilic solvent, the hydrophilic solvent being effective to ex... | 02/01/1983 |
| 4342737 | Process of producing a potassium sulfate salt A process of producing a potassium sulfate salt comprising reacting sulfuric acid with potassium chloride at an equivalent ratio of sulfuric acid to potassium chloride of 1.07 to 1.40 at a temperature of from the melting point of potassium bisulfate to ab... | 08/03/1982 |
| 4303619 | Apparatus for continuously producing potassium sulfate An improved apparatus for producing potassium sulfate and hydrogen chloride gas from potassium hydrogen sulfate and potassium chloride is provided, which comprises a horizontal type muffle furnace having an arcuate upper wall, at least one shaft of an agi... | 12/01/1981 |
| 4299653 | Method of bleaching pulp with an aqueous solution of chlorine dioxide and chlorine followed by a chlorine solution The advantages of the serial application of chlorine dioxide and chlorine without intermediate wash during the bleaching of wood pulp in the absence of significant amounts of dissolved organic materials are improved by the presence of small quantities of ... | 11/10/1981 |
| 4269817 | Production of chlorine from chloride salts A process for converting chloride salts and sulfuric acid to sulfate salts and elemental chlorine is disclosed. A chloride salt and sulfuric acid are combined in a furnace where they react to produce a sulfate salt and hydrogen chloride. Hydrogen chloride... | 05/26/1981 |
| 4242312 | Removal of sodium sulfate from a sulfate-containing sodium chloride solution in a process for separating zirconium and hafnium There is disclosed, in a process for separating zirconium and hafnium, an improvement for the removal of sodium sulfate from a sulfate-containing sodium chloride solution. This improvement includes adding a water-miscible organic precipitant such as metha... | 12/30/1980 |
| 4215100 | Method of producing potassium sulfate A method of producing potassium sulfate consists in conversion of sodium sulfate with potassium chloride in an aqueous medium to yield glaserite and a glaserite solution. Then, the glaserite is decomposed with potassium chloride in water to obtain potassi... | 07/29/1980 |
| 4196226 | Alkali metal aluminum phosphate Alkali metal aluminum phosphate granules having a calcium rich outer surface are provided which are characterized by improved flow and dusting properties as well as lower hygroscopicity without a change in leavening acid performance. The product can be us... | 04/01/1980 |
| 4195070 | Preparation of a MgCl2 solution for Nalco's MgCl2 process from MgSO4 and other MgSO4 salts A method of beneficiating a mixed salt mineral ore containing potassium and magnesium sulfates and/or their hydrates which allows the recovery of anhydrous magnesium chloride and the simultaneous recovery of commercially acceptable potassium sulfate.... | 03/25/1980 |
| 4174382 | Process for the production of coarse K2 SO4 in crystallizers and classifiers A process for selectively recovering coarse crystalline K2 SO4 from a crystallizer is disclosed. A classifier comprising an elongated cylindrical vessel which is located separate from the crystallizer is employed in the process. Crys... | 11/13/1979 |
| 4132759 | Method of purifying brine used in electrolysis by the amalgam process In the process for the production of chlorine and alkali metal hydroxide by electrolysis according to the amalgam process using calcium- and/or sulphate containing crude salt, the calcium and/or sulphate contents introduced into the brine circuit by the c... | 01/02/1979 |
| 4086329 | Integrated chlorine dioxide producing system Chlorine dioxide and chlorine are produced by reduction of sodium chlorate with chloride ions in an aqueous acid medium having a total acid normality of 2 to 4.8 normal. The reaction medium is maintained at its boiling point under a subatmospheric pressur... | 04/25/1978 |
| 4079123 | Process for the production of chlorine dioxide An improved process is provided for the production of chlorine dioxide and chlorine wherein an alkali metal chlorate and a strong acid selected from the group sulfuric acid, hydrochloric acid, phosphoric acid, and mixtures thereof are circulated and react... | 03/14/1978 |
| 4049784 | Production of chlorine dioxide with product slurry metathesis An improved process for the production of chlorine dioxide wherein an alkali metal chlorate and a mineral acid are reacted in a single vessel, and the resultant alkali metal salt is converted to a more desirable salt in a metathesis column by reaction wit... | 09/20/1977 |
| 4049785 | Production of chlorine dioxide with product slurry metathesis An improved process for the production of chlorine dioxide wherein an alkali metal chlorate and a mineral acid are reacted in a single vessel, and the resultant alkali metal salt is converted to a more desirable salt in a metathesis column by reaction wit... | 09/20/1977 |
| 4045543 | Production of potassium sulfate and hydrogen chloride Potassium sulfate (K2 SO4) is prepared by reaction of potassium chloride and sulfuric acid in an aqueous medium by initially removing evolved HCl in the gaseous form at temperatures of about 65°-120° C., then removing the remaining... | 08/30/1977 |
