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| Number | Title | Issue Date |
| 4781899 | Purification of crystallized solids made via continuous crystallization Crystal solids made via the continuous crystallization of a crude, concentrated aqueous feed solution are recovered as a crystalline solid product that is relatively free of impurities present in the crystallizer liquor. A portion of the withdrawn crystal... | 11/01/1988 |
| 4654204 | Production of sodium bicarbonate by reversion of soda-type feed salt Sodium bicarbonate is produced by introducing solid sodium carbonate, sodium sesquicarbonate, and/or Wegscheider's salt into a reversion slurry, saturated with respect to bicarbonate and containing at least 10 wt. % solids, to effect rapid and complete co... | 03/31/1987 |
| 4652054 | Solution mining of trona or nahcolite ore with electrodialytically-produced aqueous sodium hydroxide A cyclic solution mining method that uses aqueous sodium hydroxide for recovering valuable alkali values, preferably as soda ash, from subterranean deposits of trona or nahcolite, even when such deposits are NaCl-contaminated. The aqueous sodium hydroxide... | 03/24/1987 |
| 4588569 | Dry injection flue gas desulfurization process using absorptive soda ash sorbent Hot flue gas containing sulfur oxides is treated in a dry injection desulfurization process by injecting a dry particulate soda ash sorbent into the SO2 -contaminated gas stream, which must contain 0.5-10 wt % water and be at a temperature of 1... | 05/13/1986 |
| 4557910 | Production of soda ash from nahcolite Soda ash is prepared from dry-mined nahcolite ore by partially calcining the ore, dissolving the ore in aqueous solution, separating the resultant solution from the ore insolubles, crystallizing anhydrous sodium carbonate or sodium carbonate monohydrate, ... | 12/10/1985 |
| 4555391 | Dry injection flue gas desulfurization process YUtilization of a soda-type dry sorbent in a dry injection flue gas desulfurization process is increased, without sacrifice in the SO2 removal efficiency, by reinjecting a portion of the sorbent collected in the baghouse filter back into the ho... | 11/26/1985 |
| 4519806 | Enhanced recovery of soda ash from aqueous sodium carbonate solutions containing Na2 SO4 - and NaCl A method for enhancing the recovery of dense soda ash from Na2 SO4 - and NaCl-containing aqueous sodium carbonate solutions by first co-crystallizing anhydrous sodium carbonate and burkeite and next introducing the co-crystallized so... | 05/28/1985 |
| 4498706 | Solution mining of trona or nahcolite ore with aqueous NaOH and HCl solvents Separate deposits of trona or nahcolite ore are solution mined with two solvents, aqueous sodium hydroxide and aqueous hydrogen chloride. Aqueous sodium carbonate solution is withdrawn from the region of the NaOH-treated ore deposit, for recovery of soda ... | 02/12/1985 |
| 4462794 | Method of operating a rotary calciner retrofitted to coal-firing Method of operating a rotary calciner retrofitted from oil- or natural gas-firing to coal-firing, in which coal is burned in a coal furnace and the coal combustion gases are then heated further in a booster burner utilizing oil or natural gas, to raise th... | 07/31/1984 |
| 4299799 | Carbon treatment of monohydrate crystallizer liquor Improved process for preparing sodium carbonate from crude trona without carbon column scaling by evaporating a portion of water from a clarified sodium carbonate solution to crystallize sodium carbonate crystals therefrom, separating the sodium carbonate... | 11/10/1981 |
| 4288419 | Enhanced recovery of sodium carbonate from NaCl-containing sodium carbonate solutions A method for enhancing recovery of sodium carbonate from sodium carbonate solutions which contain sodium chloride. Anhydrous sodium carbonate is recovered in good yields from aqueous sodium carbonate solutions containing sodium chloride by evaporative cry... | 09/08/1981 |
| 4285915 | Recovery of alkali values from trona ore Alkali values are recovered in a cyclic method from mechanically mined trona ore or from trona deposits by a solution mining technique utilizing a solvent comprising an aqueous solution of sodium sulfide. The ore is solubilized as sodium carbonate which i... | 08/25/1981 |
| 4283372 | Recovery of alkali values from sodium bicarbonate-containing ore with ammonia A method for recovering alkali value from sodium bicarbonate-containing ore by utilizing an aqueous solvent containing ammonia. The aqueous ammonia solvent is contacted with the ore to solubilize the sodium bicarbonate-containing ore. The alkali values in... | 08/11/1981 |
