PERMFILE125939

• Permit No: M1999002
• IBM Index Class Name: Permit File
• Doc Date: 6/18/1999
• Doc Name: PROCESS FOR SOLUTION MINING NAH COLITE
• Media Type: D
• Archive: No

~~o~Q • III IIIIIIIIIIIIIIII • j
United States Patent n91 ~"~~ N~„2e: ~6jec~or't (X) ' 3,779,602
Dot e: 6-~~ °S `7
Beard et al. fas) Dec. 18, 1973
[3a] PROCESS FOR SOLUTION AtININC
NAHCOLITE
(73] Ins•en[on: Thomas N. Beard, Denver, Colo.;
Paler Van hieurs, Houston, Tex.
(73] Assignee: Shell Oil Company, Houston, Te z.
[22] Filed: Aug. 7, 1972
(211 Appl. No.: 278,407
(527 U.S.C1 ......................................29915, 1661303
(311 Inl. CI ............................................. E21b 43/28
(387 Field of Search .................... 299/4, 5; 166/272,
166/303
(567 References Cited
UNITED STATES PATENTS
2,J88,U09 101!943 Pike .................................... 299/5 X
2,623.J8d 1/1937 Pike et al ............................ 29915'X
7.700,280 10/1972 Papadnpoulos et al ................. 299/3
Primar7• Eramintr-Ernest R. Purxr
Arrornr7•-Theodore E. Bieber
(371 ABSTRACT
The process of solution mining sodium bicarbonate
(e.g., nahcolite) from a subsurface sodium bicarbon-
ate containing, oil shale formation with water is im-
proved by conducting leaching opera ions at a se-
lected temperature greater than 230°F and adjusting
pressure to a particular preferred value for [he :e-
lected leaching temperature.
6 Claims, 4 Drawing Figures
9