Low energy ammonia synthesis process
First Claim
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1. In an ammonia synthesis process wherein hydrogen and nitrogen are reacted at elevated pressure in an ammonia synthesis converter to produce ammonia, the improvement which comprises:
- recovering the ammonia from the ammonia synthesis converter by water absorption which forms a water-ammonia mixture;
distilling said water-ammonia mixture in a distillation column to recover anhydrous ammonia;
flashing said ammonia by reducing the pressure of said ammonia recovered from said distillation column in stages whereby in each stage vapor is formed and the liquid ammonia cooled,absorbing said vapor with water to form an aqua-ammonia mixture, anddistilling said aqua-ammonia mixture in the same distillation column as said water-ammonia mixture.
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Abstract
An improved synthesis loop for the production of ammonia has a low pressure, i.e. less than 100 atmospheres, a water absorption recovery system which utilizes low level heat recovered from the process for producing the synthesis gas to distill the ammonia-water mixture and an ammonia absorption refrigeration system which utilizes the same distillation column for both the water absorption system and the refrigeration system.
5 Citations
7 Claims
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1. In an ammonia synthesis process wherein hydrogen and nitrogen are reacted at elevated pressure in an ammonia synthesis converter to produce ammonia, the improvement which comprises:
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recovering the ammonia from the ammonia synthesis converter by water absorption which forms a water-ammonia mixture; distilling said water-ammonia mixture in a distillation column to recover anhydrous ammonia; flashing said ammonia by reducing the pressure of said ammonia recovered from said distillation column in stages whereby in each stage vapor is formed and the liquid ammonia cooled, absorbing said vapor with water to form an aqua-ammonia mixture, and distilling said aqua-ammonia mixture in the same distillation column as said water-ammonia mixture. - View Dependent Claims (2, 3)
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4. An ammonia synthesis loop wherein hydrogen and nitrogen are reacted at elevated pressure which comprises:
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an ammonia synthesis converter wherein said hydrogen and nitrogen are reacted to form ammonia; water absorption means for recovering the ammonia produced in said ammonia synthesis converter as a water-ammonia mixture; distillation means for distilling said water-ammonia mixture to recover anhydrous ammonia; flashing means for reducing the pressure of said ammonia recovered from said distillation means in stages whereby in each stage ammonia vapor is formed and the liquid ammonia cooled; and means for recovering the ammonia vapor as a water-ammonia mixture and returning said mixture to said distillation means. - View Dependent Claims (5)
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6. In an ammonia synthesis process wherein hydrogen and nitrogen are reacted at elevated pressure in an ammonia synthesis converter to produce ammonia, the improvement which comprises:
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recovering the ammonia from the ammonia synthesis converter by water absorption which forms a water-ammonia mixture; distilling said water-ammonia mixture in a distillation column to recover anhydrous ammonia; flashing said ammonia by reducing the pressure of said ammonia recovered from said distillation column in stages whereby in each stage vapor is formed and the liquid ammonia cooled; absorbing said vapor from the last flashing stage with water to form an aqua-ammonia mixture, and absorbing said vapor from each preceding flashing stage with water said water being provided by the aqua-ammonia mixture formed in the subsequent absorption stage. - View Dependent Claims (7)
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Specification