| 摘要 |
1,256,245. Oxychlorination catalysts; separating gas mixtures by absorption; cooling fluidised bed. PRINCETON CHEMICAL RESEARCH Inc. 25 Oct., 1968 [27 Dec., 1967; 10 June, 1968 (2)], No. 50892/68. Headings BIE, B1F; B1L and B1X. [Also in Divisions C2 and C5] Oxychlorination catalysts comprise an iron oxide and (a) at least one Group IIIA, Group IV A, Rare Earth or Actinide metal oxide, and (b) at least one Group I or II metal oxide. The catalysts may be supported on conventional carriers, e.g. diatomaceous earth, quartz, silica glass, alumina, pumice, silica gel, mullite or silicon carbide, and prepared by impregnation with a soluble salt followed by its decomposition, or may be unsupported and prepared by pelletising or other agglomerating techniques, or by spray drying. The separation of organic chlorides and hydrogen chloride from an ethylene-containing gas stream is effected by scrubbing the stream with liquid dimethyl formamide. Apparatus for conducting a fluidised bed oxychlorination reaction comprises an upper fluidised catalyst bed disposed from 3 to 50 ft. vertically above a lower fluidised catalyst bed, the upper bed having a horizontal crosssectional area greater than that of the lower bed and being disposed upon a horizontal support through which a plurality of spaced, vertically disposed, tubes connect the lower reaction zone with the upper bed, the space within the support between the vertical tubes being closed off from the reaction zones and being adapted for the passage therethrough of cooling medium to control the temperature of the reaction medium entering the upper bed. Cooling of the lower bed is assisted by the passage of excess catalyst from the upper bed through an overflow gravity return to the lower bed. The distance between the beds and the temperature of the lower bed may be controlled by the use of an externally disposed catalyst reservoir connected to both beds. |
