年产3万吨合成氨变换工艺工艺流程.doc

? ( 2 of 4 ) United States Patent 6,178,774 Billy , ? et al. January 30, 2001 Process and plant for the combined production of an ammonia synthesis mixture and carbon monoxide Abstract In the process of the invention, an ammonia synthesis mixture and carbon monoxide are produced. The hydrogen is purified in a nitrogen-washing column (61). The carbon monoxide is recovered cryogenically from a first liquid fraction (51) collected at the base of the said washing column (61), in a medium-pressure stripping column (62), then in a low-pressure distillation column (63). A second liquid fraction (52) is drawn from a position intermediate between the base and head of the washing column (61). Inventors: Billy; Jean (Plessis Trevise, FR); Fauroux; Daniele (Limeil-Brevannes, FR) Assignee: LAir Liquide, Societe Anonyme pour lEtude et lExploitation des Procedes Georges Claude (Paris Cedex, FR) Appl. No.: 252661 Filed: February 19, 1999 Foreign Application Priority Data Feb 20, 1998 [FR] 98 02099 Current U.S. Class: 62/620 ; 62/630; 62/920 Field of Search: 62/617,620,618,630,632,631,920 References Cited [Referenced By] U.S. Patent Documents 4478621 October 1984 Fabian 4636334 January 1987 Skinner et al. 5295356 March 1994 Billy 5609040 March 1997 Billy et al. Foreign Patent Documents 38 01 712 March DE 0 092 770 March EP Primary Examiner: Doerrler; William Attorney, Agent or Firm: Young Thompson Claims What is claimed is:1. In a process for combined production of an ammonia synthesis mixture and carbon monoxide, comprising the production of an ammonia synthesis mixture (N.sub.2 +3H.sub.2) from a) hydrogen under high pressure, purified in a final step by washing with nitrogen in a washing column, and b) a stream of nitrogen at high pressure, the improvement which comprises: drawing off a first liquid fraction from the base of the nitrogen-washing column which is rich in carbon mo