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US 7,537,744 B2Granted
Process for ammonia recovery
AssigneeRohm and Haas Company
InventorsAbraham Benderly, Keith Frederick Briegel, Michael Stanley DeCourcy, Ronald Eugene Myers
Life of this patent
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Abstract
An improved process for ammonia recovery is provided for the recovery of substantially pure ammonia for use in industrial processes. In this improved method, specific raw materials and/or specific materials of construction are used. Overall efficiency and operational cost savings are increased as a result of the process of the present invention.
Claims7
An ammonia recovery process, the process comprising the steps of:
- a) providing an ammonia containing process stream;
- b) providing a capture solution comprising one or more selected from the group consisting of:
- phosphoric acid, nitric acid, oxalic acid, boric acid, and ammonium hydrogen phosphate;
- c) quenching the ammonia containing process stream to form an ammoniated capture solution;
- d) purifying the ammoniated capture solution to form a purified ammoniated capture solution;
- e) freeing ammonia from the purified ammoniated capture solution to form a concentrated ammonia product stream;
- wherein the concentration of Nickel ions in the capture solution is maintained at a concentration of less than 250 ppm.
4 more elements
An ammonia recovery process, the process comprising the steps of:
- a) providing an ammonia containing process stream;
- b) providing a capture solution comprising one or more selected from the group consisting of:
- phosphoric acid, nitric acid, oxalic acid, boric acid, and ammonium hydrogen phosphate;
- c) quenching the ammonia containing process stream to form an ammoniated capture solution;
- d) purifying the ammoniated capture solution to form a purified ammoniated capture solution;
- e) freeing ammonia from the purified ammoniated capture solution to form a concentrated ammonia product stream;
- wherein the concentration of Nickel ions in the capture solution is maintained at a concentration of less than 250 ppm wherein the freeing is performed in a dissociation column and further wherein the dissociation column comprises materials of construction having less than 20% Nickel by weight.
4 more elements
An ammonia recovery process, the process comprising the steps of:
- a) providing an ammonia containing process stream;
- b) providing a capture solution comprising one or more selected from the group consisting of:
- phosphoric acid, nitric acid, oxalic acid, boric acid, and ammonium hydrogen phosphate;
- c) quenching the ammonia containing process stream to form an ammoniated capture solution;
- d) purifying the ammoniated capture solution to form a purified ammoniated capture solution;
- e) freeing ammonia from the purified ammoniated capture solution to form a concentrated ammonia product stream;
- wherein the concentration of Nickel ions in the capture solution is maintained at a concentration of less than 250 ppm;
- and wherein the freeing is performed in a dissociation column and further wherein the dissociation column comprises one or more low-nickel content materials selected from the group consisting of:
- glass, epoxy, elastomer, fluoropolymer, 300 series stainless steels, 400 series steels, duplex stainless steels, tantalum, and zirconium.
6 more elements
Dependencies are inferred from the claim text.