The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 24, 2014
Filed:
Aug. 09, 2013
Sparstane Technologies Llc, Birmingham, AL (US);
Murray P. Hasinoff, Birmingham, AL (US);
Taylor Pursell, Mountain Brook, AL (US);
Joseph A. Saiia, Birmingham, AL (US);
Arthur R. Shirley, Jr., Florence, AL (US);
Keith D. Cochran, Killen, AL (US);
Timothy G. Holt, Florence, AL (US);
Sparstane Technologies LLC, Birmingham, AL (US);
Abstract
A continuous countercurrent flow process for converting FGD gypsum to ammonium sulfate and calcium carbonate including countercurrent flows with internal recycle of liquids to maximize the purity of reaction products while minimizing reaction times, and further include embodiments of the process that provide a yield of both ammonium sulfate and calcium carbonate to be 97 to 100%, and embodiments that provide for processes having a total time of reaction being 8 to 12 minutes, the invention further including processes for removing contaminants from the FGD gypsum employing an acid rinse process and/or a slurry tank reactor process.