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:
Aug. 21, 2007
Filed:
Jul. 31, 2006
Benny E. Blackwell, Newark, DE (US);
Luis Alberto Chu, Landenberg, PA (US);
Monroe Davis, Avondale, PA (US);
Wayne B. Ely, West Chester, PA (US);
Robert Joseph Flowers, Newark, DE (US);
Steven Lamar Grise, Landenberg, PA (US);
Zeru Berhane Tekie, Newark, DE (US);
Benny E. Blackwell, Newark, DE (US);
Luis Alberto Chu, Landenberg, PA (US);
Monroe Davis, Avondale, PA (US);
Wayne B. Ely, West Chester, PA (US);
Robert Joseph Flowers, Newark, DE (US);
Steven Lamar Grise, Landenberg, PA (US);
Zeru Berhane Tekie, Newark, DE (US);
E. I. du Pont de Nemours and Company, Wilmington, DE (US);
Abstract
The present invention provides a process for removing ammonia as an aqueous salt solution from an acid gas comprising ammonia and hydrogen sulfide. A strong acid, such as sulfuric acid, is used as a scrubbing agent to convert ammonia to an ammonium salt. Control of pH and stripping in combination with reboiler or evaporators reduces hydrogen sulfide concentration. The ammonium salt is produced as an aqueous solution, which may crystallized to form a solid product. The ammonium salt solution or solid may be used as a fertilizer.