MR. DAVID M. SMITH, MD
Medical Practice at Commons Way, Princeton, NJ

6428759, Aug 6, 2002

May 2, 2000

09/563485

David E. Smith - Princeton NJ
William C. Copenhafer - Yardley PA
Richard W. Chastain - Lyman WY

FMC Wyoming Corporation - Philadelphia PA

C01D 700

4232062, 423421

A process is disclosed for converting dilute brines of sodium carbonate and sodium bicarbonate to form feed solutions from which sodium based chemicals may be recovered. The sodium bicarbonate in a dilute brine is neutralized and the brine then fortified with calcined trona to form a feed liquor concentrated in sodium carbonate from which sodium based chemicals may be recovered in a Monohydrate or other crystallization process.

5283054, Feb 1, 1994

Mar 30, 1993

8/040059

William C. Copenhafer - Yardley PA
David E. Smith - Princeton NJ
Gerald F. Niedringhaus - Rock Springs WY

FMC Corporation - Philadelphia PA

C22B 2610

4232062T

A process for producing valuable sodium-based chemicals from a brine containing sodium carbonate and sodium bicarbonate, such as those containing from about 8% to about 20% total alkali obtained by contacting water with an underground trona formation by heating the brine at about 100. degree. C. to about 140. degree. C. to evaporate water, convert sodium bicarbonate to sodium carbonate and to drive off resulting carbon dioxide, reacting the brine with reduced sodium bicarbonate with an aqueous sodium hydroxide solution in amounts to convert essentially all of the remaining sodium bicarbonate in the brine to sodium carbonate, cooling to about 5. degree. C. to about 25. degree. C. to precipitate sodium carbonate decahydrate crystals, separating the crystals from their mother liquor, melting the separate crystals to form a sodium carbonate solution, heating the solution to from above about 60. degree. C. to below 110. degree. C. to evaporate water, precipitating sodium carbonate monohydrate crystals, separating the sodium carbonate monohydrate crystals from their mother liquor and calcining them to soda ash which is recovered as a product.

2002005, May 9, 2002

Sep 5, 2001

09/946944

William Copenhafer - Yardley PA, US
David Smith - Princeton NJ, US

C01D007/12

423/206200, 423/427000

A process for the production of soda ash by withdrawing an aqueous mining solution containing dissolved sodium carbonate and at least about 1 wt % sodium bicarbonate from an underground alkali source; stripping COgas from the withdrawn aqueous mining solution, to convert sodium bicarbonate dissolved therein to sodium carbonate; co-crystallizing sodium carbonate monohydrate and sodium sesquicarbonate by evaporation of water from the CO-stripped aqueous mining solution, without co-crystallization of anhydrous sodium carbonate, to form a slurry of crystalline solids in an aqueous liquor; recovering crystalline solids from the slurry; and calcining the recovered crystalline solids to produce soda ash.

6228335, May 8, 2001

Dec 10, 1997

8/987978

William C. Copenhafer - Yardley PA
David E. Smith - Princeton NJ

FMC Wyoming Corporation - Philadelphia PA

C01D 700, C22B 2600

4232062

A process for the production of soda ash by withdrawing an aqueous mining solution containing dissolved sodium carbonate and at least about 1 wt % sodium bicarbonate from an underground alkali source; stripping CO. sub. 2 gas from the withdrawn aqueous mining solution, to convert sodium bicarbonate dissolved therein to sodium carbonate; co-crystallizing sodium carbonate monohydrate and sodium sesquicarbonate by evaporation of water from the CO. sub. 2 -stripped aqueous mining solution, without co-crystallization of anhydrous sodium carbonate, to form a slurry of crystalline solids in an aqueous liquor; recovering crystalline solids from the slurry; and calcining the recovered crystalline solids to produce soda ash.

2002019, Dec 19, 2002

Jun 13, 2001

09/880566

David Smith - Princeton NJ, US

C01D007/12

423/421000, 423/209000

A method for producing high grade soda ash from a solution mined brine containing sodium bicarbonate by processing the mine brine through a monohydrate crystallization step to the final product is described. The mine brine is treated to decompose and thereby to convert sodium bicarbonate to sodium carbonate and to concentrate the sodium carbonate to a concentration such that a feed liquor is formed which is suitable for crystallizing sodium carbonate monohydrate crystals of high purity from the feed liquor. The sodium carbonate monohydrate crystals recovered from the process are converted to soda ash by known techniques.

2002000, Jan 24, 2002

May 7, 2001

09/851020

William Copenhafer - Yardley PA, US
David Smith - Princeton NJ, US

C01D007/12

423/425000, 423/422000, 423/421000

A process for the production of soda ash by withdrawing an aqueous mining solution containing dissolved sodium carbonate and at least about 1 wt % sodium bicarbonate from an underground alkali source; stripping COgas from the withdrawn aqueous mining solution, to convert sodium bicarbonate dissolved therein to sodium carbonate; co-crystallizing sodium carbonate monohydrate and sodium sesquicarbonate by evaporation of water from the CO-stripped aqueous mining solution, without co-crystallization of anhydrous sodium carbonate, to form a slurry of crystalline solids in an aqueous liquor; recovering crystalline solids from the slurry; and calcining the recovered crystalline solids to produce soda ash.