Abstract: Process for selectively removing oxygenated contaminants from streams prevalently containing hydrocarbons with from 3 to 8 carbon atoms characterized in that it comprises an adsorption step wherein said contaminants are adsorbed by an adsorbent essentially consisting of silica gel at a temperature of between 0 and 150.degree. C. and a pressure of between 1 and 20 atms and a regeneration step for removing the adsorbed substances by thermal treatment in a stream of insert gas carried out at a temperature of between 100 and 200.degree. C.

Abstract: A process for selectively removing nitrogenated and/or sulfurated contaminants from streams prevalently containing hydrocarbons with from 3 to 8 crbon atoms characterized in that it comprises an adsorption step wherein said contaminants are adsorbed by an adsorbent essentially consisting of silica gel at a temperature of between 0 and 150.degree. C. and at a pressure of between 1 and 20 atm and a regeneration step to remove the adsorbed substances by thermal treatment in a stream of insert gas carried out at a temperature of between 100 and 200.degree. C.

Abstract: Disclosed is an integrated process for producing olefins by starting from methane containing gas mixture, which process essentially comprises the following steps:converting methane into higher hydrocarbons by oxidative coupling carried out in the presence of air and/or oxygen;dehydrogenating, with the aid of a catalyst, said higher hydrocarbons, with an olefin-rich mixture being obtained;removing H.sub.2 O, CO.sub.2, CO and H.sub.2 from the resulting olefinic mixture;removing from said olefinic mixture any not converted methane, and recycling it upstream from the oxidating coupling;separating ethylene from the olefinic mixture;separating any not dehydrogenated ethane from the olefinic mixture.

Abstract: A catalytic system for converting methane into higher hydrocarbons, which catalytic system falls within the scope of the following empirical formula:Aa Bb Cc Oxin which:A is an element selected from the group consisting of Si, Ti, Zr;B is an element selected from the group consisting of La, Sc, Y, andC is an alkali or alkali-earth metal, whereina is a numeral comprised within the range of from 0.01 to 10,b is a numeral comprised within the range of from 0.01 to 10,c is a numeral comprised within the range of from 0.01 to 10,X is a numeral which satisfies the valency state with which the several elements appear in the catalytic system,is disclosed.