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| Number | Title | Issue Date |
| 7150766 | Method of particle formation The invention provides a method for forming particles of a target substance, comprising (a) co-introducing into a particle formation vessel, under controlled temperature and pressure, a supercritical or near-critical anti-solvent fluid; a first target substance in a... | 12/19/2006 |
| 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 |
| 7008599 | High throughput crystal form screening workstation and method of use A filtration assembly operable in connection with a crystal form screening workstation that provides for automated crystal form screening is disclosed. The assembly includes first and second valves, with each valve having an internal passage and first, second and th... | 03/07/2006 |
| 7001526 | Optical isomer separation method Methods for separation of two optical isomers in a racemate into its constituent isomers by statistical means are described, whereby the saturated racemate solution is first allotted into small samples by means of microfluidic or inkjet techniques to obtain small sa... | 02/21/2006 |
| 6860907 | Method of particle formation The invention provides a method for forming particles of a target substance, comprising (a) co-introducing into a particle formation vessel, under controlled temperature and pressure, a supercritical or near-critical anti-solvent fluid; a “target solution or suspe... | 03/01/2005 |
| 6855176 | Emulsion crystallisation with recycle A method for purifying substances through emulsion crystallisation is described, whereby (a) an emulsion of organic liquid droplets in a continuous water phase containing the impure substance is formed; (b) the emulsion is super-saturated in the substance; (c) cryst... | 02/15/2005 |
| 6558434 | Method for cooling by altering crystal field interaction A method for cooling is provided which makes use of materials which undergo a pressure induced structural phase transition such that the material's crystal field interaction changes, and which colds down during this phase transition. This effect is used f... | 05/06/2003 |
| 6428583 | Separation process A crystallization process is described for separating a desired substance from an aggregate mixture in which an emulsion of droplets in a continuous phase containing the aggregate mixture is formed and supersaturated, characterized in that the emulsion is... | 08/06/2002 |
| 6364914 | Method of crystallization with the particle size distribution being controlled Herein is disclosed a method of crystallization with the particle size distribution being controlled, characterized in that while crystals are being precipitated by vacuum concentration crystallization, the temperature of the slurry is periodically varied... | 04/02/2002 |
| 6180074 | Method for processing flue gases containing sulphur oxides A method for removing contaminants, such as sulfur dioxide, mercury and hydrochloric acid, out of flue gases is provided, said method including the steps of: treating the flue gases with a reagent, such as sodium carbonate, sodium bicarbonate and ammonium... | 01/30/2001 |
| 6103139 | Single-use encapsulated hot pack activator An activator (10) made in accordance with the principles of the present invention includes activating crystals (11) that have been formed into a shape and then coated with coating (12). The activator (10) of the present invention can be used in any enviro... | 08/15/2000 |
| 5755975 | Separation of substances from a liquid mixture by crystallization In a process for separating substances from a liquid mixture by crystallization in a crystallizer, a two-phase seed layer in the form of a melt or solution of the mixture to be separated, with crystals suspended therein, is applied, prior to the crystalli... | 05/26/1998 |
| 5614104 | Process and apparatus for the continuous determination of the sylvine saturation of hot solutions for monitoring and controlling the hot solubilizing of a crude potash salt Process for determining the sylvine saturation in which the salt concentration in the solid matter-free crude solution through temperature determination at a temperature TM >T, and subsequently after contacting with KCl at a temperature TN... | 03/25/1997 |
| 5575923 | Salt basket for crystallizer and method of use in zero liquid discharge industrial facilities An improved salt basket for dewatering solids, particularly salts resulting from evaporation of industrial wastewaters. The salt basket system includes a pressurizable vessel having a screen floor situated above a bottom liquid collection head, an inlet f... | 11/19/1996 |
| 5505924 | Multistage countercurrent recrystallization process and apparatus for performing same A multistage process for the separation and purification of a desired crystalline material by repeated dissolution and recrystallization, wherein crystals and solvent move countercurrent to one another through the stages. A fluid temperature gradient is m... | 04/09/1996 |
| 5447542 | Process for separating and purifying substances by crystallization from the melt In the process for separating and purifying substances by crystallization from the melt under pressure, the melt is subjected to pressure under an inert gas atmosphere and then cooled, whereupon it crystallizes. The residual melt is separated from the res... | 09/05/1995 |
| 5448005 | Crystallization of paraxlene from high purity paraxylene feeds This invention is a crystallization process for p-xylene recovery. A single temperature crystallization production stage is used for producing p-xylene from a feed having an above equilibrium p-xylene concentration, such as from a toluene disproportionati... | 09/05/1995 |
| 5447541 | Process for separating and purifying substances by crystallization from the melt under high pressure Process for separating and purifying substances by crystallization from the melt under high pressures In the process for separating or purifying substances by crystallization from melts or highly concentrated solutions under high pressures, gas is dissolv... | 09/05/1995 |
| 5435919 | Optically-active, amhiphilic, water-soluble free-radical addition copolymers and their use in the resolution of racemic mixtures Optically-active, amphiphilic, free-radical addition copolymers having an optically-active hydrophobic portion and an ionic hydrophilic portion are effective resolving agents. This utility is based on a unique combination of properties, viz., water solubi... | 07/25/1995 |
| 5433932 | Process to recover azide values from azide-based gas generating materials In a process for recovering an alkali metal azide from a waste gas generating material containing the alkali metal azide and a metal oxide reactable with the azide, the gas generating material is mixed with a solvent for the alkali metal azide. This produ... | 07/18/1995 |
| 5332674 | Process for preparing (R) and (S)-1,2-isopropylideneglycerol by crystallizing racemic benzoyl ester A process is described for separating the optical isomers of 1,2-isopropylideneglycerol, of formula (I), comprising partially stereoselective enzymatic hydrolysis of 1,2-isopropylideneglycerol benzoyl ester (II) catalyzed by a free or immobilized lipase, ... | 07/26/1994 |
| 5240467 | Multistage countercurrent recrystallization process and apparatus for performing same A multistage process for the separation and purification of a desired crystalline material by repeated dissolution and recrystallization, wherein crystals and solvent move countercurrent to one another through the stages. A fluid temperature gradient is m... | 08/31/1993 |
| 5230769 | Process and apparatus for separating substances by crystallization A process is provided for the separation of substances by melt crystallization. The organic mixtures which are difficult to crystallize are heated to a temperature sufficient to obtain a melt with the melt then being moved through a three-dimensional crys... | 07/27/1993 |
| 5154805 | Method of preparing chlorate The invention discloses a method in the electrolytic production of alkali metal chlorate which is recovered by crystallization and separation of the crystals from a solution recycled to the electrolysis process. A given proportion of the crystals formed a... | 10/13/1992 |
| 5090965 | Process for the separation of substances by cooling crystallization In the process for the separation of substances by cooling crystallization, the mixture remaining in the crystallizer after separation of the crystal layer is removed and the crystal layer is melted. The process is distinguished in that the mixture, which... | 02/25/1992 |
| 5084260 | Method for producing pure boric acid Pure boric acid is obtained by a high-yield method with a non-pollutant effluent discharge, comprising the following stages carried out in succession: a) dissolving impure boric acid in an aqueous vehicle to form an aqueous solution of impure boric acid; ... | 01/28/1992 |
| 5062862 | Process and apparatus for recovering a pure substance from a liquid mixture by crystallization The invention relates to a crystallization process for recovering a pure substance from a liquid mixture, a starting mixture being cooled down in a crystallization zone to form a crystal suspension from which crystals of the pure substance are recovered, ... | 11/05/1991 |
| 4975200 | Potassium fluoride removal from potassium chloride The removal of fluoride ion from potassium chloride containing at least a small amount of an acidic component with water is improved by adjusting the pH of the aqueous solution employed in a fractional crystallization of between about pH6 and about pH9 or... | 12/04/1990 |
| 4956157 | Process for separating salts in seawater A process for obtaining available elements from seawater is described, which process includes two separation steps. The first separation step involved adjusting the pH of seawater to a low pH by adding a strong acid having sulphate ion, adding a strongly ... | 09/11/1990 |
| 4938934 | Recovery of cesium chloride from pollucite ore A process for recovering purified cesium chloride from a cesium aluminum silicate ore in which the ore is digested with aqueous hydrochloric acid and the silica solids removed to obtain an aqueous acidic digest solution of metal chlorides consisting of ce... | 07/03/1990 |
| 4734102 | Process for concentrating a suspension An apparatus for concentrating a suspension consisting of a hollow cylinder in which one or more tubes of a constant outward diameter extend in axial direction, in the wall of each tube at least one filter being mounted forming the only direct connection ... | 03/29/1988 |
| 4727218 | Procedure and means for separating or purifying organic substances Method and apparatus for separating and/or purifying a substance from a molten mixture by crystallization, in which the molten mixture is conducted into an annular space defined by two substantially curvilinearly-shaped surfaces, one of the surfaces being... | 02/23/1988 |
| 4723962 | Process for recovering lithium from salt brines An improved process is described for recovering lithium from evaporatively concentrated brines. Epsom salt recovered from the brine at about 0° C. is added to the concentrated lithium-containing brine, so as to precipitate lithium sulfate monohydrate, th... | 02/09/1988 |
| 4690725 | Purification of Cd and Te by zone refining Cd and Te are purified by multiple-pass zone refining in the presence of a small amount of an added gettering substance chosen from Cd, Te and CdTe. In the purification of Cd, Te, or CdTe is added, the amount of Te or of Te in CdTe being less than the amo... | 09/01/1987 |
| 4685935 | Process for producing pure magnesium sulphite A process for producing a pure magnesium sulphite from crude crystalline magnesium sulphite. Into a full suspension or flow containing magnesium sulphite crystals at least one further water-containing and heat-supplying flow is led. The heat-supplying flo... | 08/11/1987 |
| 4666456 | Process for the continuous partial crystallization and the separation of a liquid mixture Process for continuous crystallization of a liquid mixture in which the mixture is led through a cascade of cooling sections. The temperature in the first section is such that a part of the mixture crystallizes, the temperature in each succeeding section ... | 05/19/1987 |
| 4650658 | Stable crystals of sodium bromite trihydrate NaBrO2.3H.sub.2 O crystals with excellent storage stability which contain at least 30 wt. % of NaBrO2.3H.sub.2 O and 0.5-5.0 wt. % of NaOH. The crystals are produced by precipitation from NaBrO2 solutions containing NaOH a... | 03/17/1987 |
| 4632809 | Apparatus for the crystallization/separation of material mixtures A crystallization/separation apparatus is disclosed for material mixtures having vertical crystallization column, cooling and heating devices, feeding-in and withdrawal connections, pumps, valves, connecting conduit tubings and drive motor, a cylindrical ... | 12/30/1986 |
| 4590058 | Process for producing high purity solutions of alkali metal hydrosulfites High purity solutions of alkali metal hydrosulfites having low concentrations of alkali metal thiosulfates are produced in a process which comprises feeding an alcohol-free aqueous solution of an alkali metal hydrosulfite containing an alkali metal thiosu... | 05/20/1986 |
| 4568353 | Process of producing coarse, pure potassium chloride crystals In a process of producing coarse pure potassium chloride crystals from feed solutions containing potassium chloride and other impurities, comprising cooling the solution under a vacuum in a plurality of stages connected in series, withdrawing by means of ... | 02/04/1986 |
