Use of tributoxyethylphosphate to control foam in the production of soda ash from trona
Patent 4083939 Issued on April 11, 1978. Estimated Expiration Date: 
April 11, 1995. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
April 11, 1995. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2411671 2777807 2792374 3341467 3399144 3595968 3725014 InventorsAssigneeApplicationNo. 779958 filed on 03/22/1977US Classes:423/421, Alkali metal containing (Li, Na, K, Rb, or Cs)23/300, With added material23/302T, Sodium compounds203/20, INCLUDING DEFOAMING OR INHIBITING FOAM423/206.2, Alkali carbonate from trona516/125The agent contains organic compound containing phosphorus (e.g., lecithin)ExaminersPrimary: Vertiz, O. R.Assistant: Straub, Gary P. Attorney, Agent or FirmInternational ClassesC01D 007/00B01D 019/02 AbstractTributoxyethylphosphate is useful in controlling foam produced during the evaporative crystallization of calcined trona solutions. The chemical is effective at low concentrations, i.e. 1 to 30 ppm, and does not significantly alter the crystal habit of the sodium carbonate crystals.Other References
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