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| Number | Title | Issue Date |
| 6162262 | Device for crystallization by isentropic expansion and its use Device and process for crystallizing a component, e.g. paraxylene, from a mixture that comprises a chamber (1) that has in its upper part means (46) for supplying the mixture, collecting means (20), and in its lower part, crystals of the component in susp... | 12/19/2000 |
| 6080977 | Apparatus for concentrating salt-containing solutions with microwave energy An apparatus for concentrating and solidifying a salt solution includes a vessel for containing the salt solution having an exposed surface, the vessel having a generally open upper portion, a cover for sealing the generally open upper portion of the vess... | 06/27/2000 |
| 4786488 | Process for the purification of hydrochloric acids A process for the purification of hydrochloric acids contaminated with C1 -chlorinated hydrocarbons involves the controlled use of a distillator column. The contaminants are removed by stripping with HCl gas, the stripping being performed in a ... | 11/22/1988 |
| 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 |
| 4296082 | Purification of wet process phosphoric acid Wet process phosphoric acid is heated by passing alternating current through the acid, preferably in carbon apparatus to concentrations above 76% P2 O5 and preferably temperatures above 500° C. to remove sulphate and fluoride and co... | 10/20/1981 |
| 4282178 | Use of hydrazine compounds as corrosion inhibitors in caustic solutions The addition of a small amount of hydrazine or a derivative or salt thereof serves to inhibit the corrosive effect of caustic such as sodium hydroxide on metal surfaces during the manufacture of the caustic or in processes using same. For instance, aqueou... | 08/04/1981 |
| 4252667 | Method for placing radioactive wastes mixed with bitumen into containers A method and device for filling containers with evaporated radioactive waste concentrates that are mixed with bitumen and from which the water has been expelled by creation of temperatures above the boiling point of water, in which the temperature of the ... | 02/24/1981 |
| 4245998 | Method and apparatus for crystallization of solution containing salts To remove salts from a solution containing the salts, hot air is injected downwards into the solution in a concentrator, and the solution is concentrated by direct contact with the hot air, thereby enhancing an evaporation efficiency in the concentrator a... | 01/20/1981 |
| 4215098 | Purification of wet process phosphoric acid Wet process phosphoric acid is heated, preferably in carbon apparatus, by passing alternating current through the acid, to concentrations above 80% P2 O5 and preferably temperatures above 500° C. to remove sulphate and fluoride and ... | 07/29/1980 |
| 3970511 | Process and installation for concentrating dilute solutions of corrosive products Dilute solutions of corrosive products, such as sulphuric or phosphoric acid, are concentrated by pre-concentrating the dilute solution and then introducing the pre-concentrated solution into a tunnel in which it flows in a thin layer over successive casc... | 07/20/1976 |
