Chemistry of inorganic compounds – Nitrogen or compound thereof – Ammonia or ammonium hydroxide
Patent
1997-05-05
1999-12-07
Langel, Wayne
Chemistry of inorganic compounds
Nitrogen or compound thereof
Ammonia or ammonium hydroxide
422148, 423359, C01C 104
Patent
active
059978341
ABSTRACT:
A process for the preparation of ammonia from a hydrogen- and nitrogen-containing synthesis gas having a combined compression step in the recirculation of synthesis gas from at least two ammonia synthesis loops. The process includes admixing to the synthesis gas a recycle gas from a first and a second ammonia separation step. The admixed gases are pressurized, and the gas is divided into a first make-up gas stream and a second make-up gas stream. The first make-up gas stream is introduced to a first ammonia reactor, and a first process stream rich in ammonia is withdrawn. The second ammonia make-up gas stream is introduced into a second ammonia reactor, and a second process stream rich in ammonia is withdrawn. Ammonia from the first and second process streams is separated. The remainders of the first and second process streams are recycled for admixing with the synthesis gas. The separated ammonia is combined and withdrawn as an ammonia product stream.
REFERENCES:
patent: 1931678 (1933-10-01), Porter
patent: 2046478 (1936-07-01), O'Leary
patent: 4180543 (1979-12-01), Ward
patent: 4181701 (1980-01-01), Topsoe et al.
patent: 4294932 (1981-10-01), Lohmuller et al.
patent: 4298589 (1981-11-01), LeBlanc et al.
Skaanderup-Larsen John
Udengaard Niels
Haldor Topsoe A/S
Langel Wayne
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