Foam prevention in sodium carbonate crystallization
Patent 4104033 Issued on August 1, 1978. Estimated Expiration Date: 
May 20, 1996. 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.
May 20, 1996. 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 2670269 2914412 3084026 3628919 3725014 3796794 3836628 3846329 3890238 Non-foaming dispersing composition Patent #: 3962119 InventorsAssigneeApplicationNo. 05/688271 filed on 05/20/1976US Classes:23/300, With added material23/302T, Sodium compounds423/206.2, Alkali carbonate from trona516/134The compound contains repeating -(OCnH2n)- (i.e., repeating unsubstituted oxyalkylene)ExaminersPrimary: Emery, Stephen J.Attorney, Agent or FirmInternational ClassesB01D 19/02 (20060101)B01D 19/04 (20060101) C01D 7/10 (20060101) C01D 7/00 (20060101) C01D 7/24 (20060101) AbstractIn crystallization of a carbonate of sodium from aqueous solutions, a water soluble homopolymer of oxyethylene or block copolymer of oxyethylene and oxypropylene is employed as a defoamer. The presence of the defoamer in the resulting sodium carbonate does not adversely interfere with carbon dioxide absorption in subsequent production of sodium bicarbonate.Other References
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