| 摘要 |
1,094,117. Heatless fractionation process. ESSO RESEARCH & ENGINEERING CO. May 11, 1965, No. 19845/65. Heading B1L. In a heatless fractionation process described with reference to Fig. 1, wherein the feed for the stage 2 beds is effluent from the stage 1 beds, each pair of adsorbent beds, i.e. beds 1, stages 1 and 2, beds 2, stages 1 and 2 and beds 3, stages 1 and 2 is subjected to equal length cycles consisting of an adsorption cycle, pressuer equalisation with the beds which have just been purged, dumping and purging, pressure equalisation with the beds which have just completed the adsorption cycle, and repressuring to the adsorption pressure. A moderately pure (Grade A) product comprises the effluents obtained from stage 1 beds during their respective adsorption cycles together with gases obtained while depressurising the stage 2 'beds, and a pure (Grade AA) product is the effluents from the stage 2 beds during their adsorption cycles. The adsorbent in the stage 1 and stage 2 beds may be charcoal. Guard beds, for example containing silica gel and charcoal, may be used between the raw feed stream and the stage 1 beds. There is reference to obtaining hydrogen as product from feed streams containing hydrocarbons, CO, H 2 O, CO 2 , H 2 S, N 2 and air. The feed stream may be producer gas, blue gas, gas from the ironsteam reaction, gas from the water gas reaction, gaseous products of thermal decomposition of hydrocarbons, synthesis gas, NH 3 decomposition gases. Hydrocarbon feeds include recycle gas, powerformer tail gas, fuel gas, catalytic cracking off-gas. |
