초록 ▼

The present invention relates to selective conversion of certain hydrocarbon feedstocks to product rich in para-dialkyl substituent benzenes over a catalyst composition comprising a crystalline zeolite having deposited thereon a coating of silica which extensively covers and resides substantially ex

The present invention relates to selective conversion of certain hydrocarbon feedstocks to product rich in para-dialkyl substituent benzenes over a catalyst composition comprising a crystalline zeolite having deposited thereon a coating of silica which extensively covers and resides substantially exclusively on the external surface thereof.

대표청구항 ▼

A conversion process which comprises contacting a feedstock selected from the group consisting of toluene, ethylbenzene, propylbenzene, butylbenzene and mixtures thereof, at conversion conditions including a temperature of from about 250°C. to about 750°C., a pressure of from about 0.1 atmosphere to

A conversion process which comprises contacting a feedstock selected from the group consisting of toluene, ethylbenzene, propylbenzene, butylbenzene and mixtures thereof, at conversion conditions including a temperature of from about 250°C. to about 750°C., a pressure of from about 0.1 atmosphere to about 100 atmospheres and a feedstock weight hourly space velocity of from about 0.1 to about 2000, with catalyst composition comprising a crystalline zeolite having deposited thereon a coating of silica which extensively covers and resides substantially exclusively on the external surface thereof as a result of contact of a crystalline zeolite, having hydrophobic properties after heating same at 540°C. for one hour in an inert atmosphere, with an aqueous emulsion of a silicon-containing compound of a molecular size substantially incapable of entering the pores of the zeolite at a temperature of from about 10°C. to about 200°C. for a time sufficient to permit from about 0.5 weight percent to about 30 weight percent silica to be deposited on the crystalline zeolite upon heating in an oxygen-containing atmosphere at a temperature of from 300°C. to about 700°C., said silicon-containing compound having the general formula: [Figure] where R1 is hydrogen, fluorine, hydroxy, alkyl, aralkyl, alkaryl, or fluoro-alkyl, the hydrocarbon substituents containing from 1 to 10 carbon atoms, R2 is selected from the same group as R1, other than hydrogen and other than methyl if R1 is hydrogen, and n is an integer of at least 10, said crystalline zeolite being characterized by an activity, in terms of alpha value, of between about 2 and about 5000, a xylene sorption capacity greater than 1 gram/100 grams of zeolite and an ortho-xylene sorptin time for 30 percent of said capacity greater than 10 minutes, said sorption capacity and sorption time being measured at 120°C. and a pressure of 4.5±0.8 mm. of mercury, and recovering a resulting product comprising dialkyl substituted benzenes wherein the amount of para-isomer thereof is in excess of normal equilibrium concentration.