| 摘要 |
The present invention is directed to a process for removing impurities from hydrocarbon streams, preferably light ends, such as propylene and ethylene, which is preferably in the liquid phase, by contacting the hydrocarbon stream containing an initial amount of an impurity with a chemical adsorbent which is composed of a modified alumina having a surface area within the range of about 10 m<2>/g to about 300 m<2>/g and a pore volume within the range of about 0.1 mL/g to about 1 mL/g under contacting conditions effective to result in a purified hydrocarbon stream containing a reduced amount of impurities, i.e., less than about 0.5 % relative to the initial amount of the acid impurity present in the hydrocarbon stream, and more preferably within the 10 ppb range. The present invention is also directed to a hydrocarbon stream, for example, propylene and ethylene, containing a reduced amount of impurities, i.e., less than about 0.5 % of the initial amount of the impurities present in the light ends stream, and more preferably within the range of about 10 ppb. Impurities, such as CO2, COS, H2S and H2O, AsH3 and PH3 may be removed from light ends stream by contacting the hydrocarbon stream with a chemical adsorbent composed of a modified alumina having a surface area within the range of about 10 m<2>/g to about 300 m<2>/g and a pore volume within the range of about 0.1 mL/g to about 1 mL/g, and preferably a bulk density within the range of about 40 lb./ft.<3> to about 60 lb./ft.<3>, which is preferably in spherical form having a diameter within the range of about 1/16'' to about 3/8''. |
