Process for making sodium carbonate decahydrate from sodium carbonate/bicarbonate liquors

Patent 6322767 Issued on November 27, 2001. Estimated Expiration Date:

May 19, 2020. 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.

Abstract Claims Description Full Text

Patent References

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Inventors

Assignee

FMC Corporation

Application

No. 574765 filed on 05/19/2000

US Classes:

423/421, Alkali metal containing (Li, Na, K, Rb, or Cs)423/206.2, Alkali carbonate from trona423/422Hydrogen containing (bicarbonate)

Examiners

Primary: Bos, Steven

Attorney, Agent or Firm

Traskbritt

Foreign Patent References

15822 GB. 07/11/1892
883202 GB. 11/11/1961
1 495 530 GB. 12/11/1977
2 098 973 A GB. 12/11/1982

International Class

C01D 007/12

Abstract

A process for forming useful sodium salts by uniquely processing dilute brine solutions having sodium bicarbonate concentrations is disclosed. The dilute brine is reduced in sodium bicarbonate content to prevent precipitation of the sodium bicarbonate in subsequent crystallization of sodium carbonate decahydrate. The reduced brine is directed to a crystallizer operated to form pure sodium carbonate decahydrate crystals and a carbonate/bicarbonate containing mother liquor. The mother liquor is then recycled as a portion of said aqueous solvent to be used in the solution mining of the ore deposit.

Other References

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