Process for the preparation of ammonia synthesis gas
First Claim
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1. A process for the preparation of raw ammonia synthesis gas, comprising the steps of:
- a) steam reforming and/or partially oxidizing a hydrocarbon feedstock containing carbon oxides together with hydrogen and nitrogen in excess of ammonia stoichiometry;
b) dividing the steam reformed and/or partially oxidized hydrocarbon feedstock into a first portion and a second portion;
c) subjecting the first portion to catalytic conversion of hydrogen and carbon oxides contained therein to methanol rich gas;
d) cooling and separating the methanol rich gas from step c) into a liquid methanol phase essentially free of nitrogen and a nitrogen rich purge gas;
e) evaporating and catalytically cracking the methanol phase separated in step (d) to hydrogen and carbon oxide rich gas by endothermic methanol cracking reactions; and
f) recombining the hydrogen and carbon oxide rich gas from step (e) with the second portion of the steam reformed and/or partially oxidized hydrocarbon feedstock from step (b) to obtain raw ammonia synthesis gas containing carbon oxides together with hydrogen and nitrogen in an amount, corresponding to the ammonia stoichiometry.
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Abstract
A process for the preparation of ammonia synthesis gas by steam reforming and/or partial oxidation of a hydrocarbon feedstock comprises the further steps of catalytically converting a part of the synthesis gas to methanol, liquifying and separating the prepared methanol from remaining nitrogen rich gas, then reconverting the nitrogen depleted methanol to hydrogen and carbon oxides gas and recombining the gas with the reminder of the nitrogen containing synthesis gas to obtain stoichiometric ammonia synthesis gas.
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12 Claims
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1. A process for the preparation of raw ammonia synthesis gas, comprising the steps of:
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a) steam reforming and/or partially oxidizing a hydrocarbon feedstock containing carbon oxides together with hydrogen and nitrogen in excess of ammonia stoichiometry; b) dividing the steam reformed and/or partially oxidized hydrocarbon feedstock into a first portion and a second portion; c) subjecting the first portion to catalytic conversion of hydrogen and carbon oxides contained therein to methanol rich gas; d) cooling and separating the methanol rich gas from step c) into a liquid methanol phase essentially free of nitrogen and a nitrogen rich purge gas; e) evaporating and catalytically cracking the methanol phase separated in step (d) to hydrogen and carbon oxide rich gas by endothermic methanol cracking reactions; and f) recombining the hydrogen and carbon oxide rich gas from step (e) with the second portion of the steam reformed and/or partially oxidized hydrocarbon feedstock from step (b) to obtain raw ammonia synthesis gas containing carbon oxides together with hydrogen and nitrogen in an amount, corresponding to the ammonia stoichiometry. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Current AssigneeHaldor Topsã¸E A/S (Haldor Topsã¸E Holding A/S)
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Original AssigneeHaldor Topsã¸E A/S (Haldor Topsã¸E Holding A/S)
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InventorsSerra, Giorgio P., Primdahl, Ivar I.
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Primary Examiner(s)Cintins, Marianne M.
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Assistant Examiner(s)Peabody, John
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Application NumberUS07/812,566Time in Patent Office515 DaysField of Search252/376, 252/377, 252/375, 252/393.1, 252/DIG. 1US Class Current252/376CPC Class CodesB01B 1/005 Evaporation for physical or...C01B 3/025 Preparation or purification...C01B 3/22 by decomposition of gaseous...C01B 3/323 Catalytic reaction of gaseo...
