Hydrodealkylation process
AssigneePhillips Petroleum Company
InventorsAn-hsiang Wu, Charles A. Drake, Ralph J. Melton
Life of this patent
Estimating the term…
Abstract
A process for hydrodealkylating C.sub.9 -C.sub.12 alkyl-substituted benzenes (preferably trimethylbenzenes) to C.sub.6 -C.sub.8 aromatic hydrocarbons (in particular, toluene and xylenes) and C.sub.1 -C.sub.5 alkanes employs a catalyst containing zeolite Beta, nickel, molybdenum and sulfur (preferably as sulfides of nickel and of molybdenum).
Claims20
A hydrodealkylation process comprising contacting (a) a fluid feed which comprises at least one alkyl-substituted benzene containing 9 to 12 carbon per molecule atoms and (b) hydrogen with (c) a catalyst comprising (I) zeolite Beta, (ii) nickel, (iii) molybdenum and (iv) sulfur, at effective hydrodealkylation conditions so as to convert said at least one alkyl-substituted benzene to a product comprising (.alpha.)at least one aromatic product hydrocarbon containing 6 to 8 carbon atoms per molecule and (.beta.) at least one alkane containing 1 to 5 carbon atoms per molecule wherein:
- said catalyst is prepared by the steps comprising:
- (1) impregnating a zeolite Beta material with compounds of nickel and molybdenum to produce a nickel- and molybdenum-impregnated zeolite Beta material;
- (2) calcining Said nickel- and molybdenum-impregnated zeolite Beta material to produce a calcined nickel- and molybdenum-impregnated zeolite Beta material;
- and (3) sulfiding said calcined nickel- and molybdenum-impregnated zeolite Beta material, said sulfiding is selected from the group consisting of
- (A) treating said calcined nickel- and molybdenum-impregnated zeolite Beta material with a mixture of about 1-99 mole-% hydrogen gas and about 99-1 mole-% of at least one sulfur compound selected from the group consisting of ammonium sulfide, carbon disulfide, carbonyl sulfide, hydrogen sulfide, thiophene, alkyl mercaptans, alkyl sulfides and mercaptoalcohols at a temperature of about 350.degree.-500.degree. C.
- (B) reducing said calcined nickel- and molybdenum-impregnated Beta material, and thereafter treating said material with a solution of at least one sulfide selected from the group consisting of hydrogen sulfide, ammonium sulfide and alkali metal sulfides, and
- (C) combinations thereof.
A hydrodealkylation process comprising contacting a fluid feed with hydrogen gas in the presence of a catalyst under a sufficient reaction condition to effect the production of an aromatic hydrocarbon containing 6 to 8 carbon atoms per molecule wherein:
- said fluid feed comprises a C.sub.9 + aromatic hydrocarbon;
- said catalyst comprises about 50 to about 95 weight % zeolite Beta, about 0.1 to about 10 weight % nickel, about 0.5 to about 20 weight % molybdenum, and about 0.1 to about 10 weight % sulfur;
- said catalyst is prepared by the steps comprising;
- (1) impregnating a zeolite Beta material with compounds of nickel and molybdenum to produce a nickel- and molybdenum-impregnated zeolite Beta material;
- (2) calcining said nickel- and molybdenum-impregnated zeolite Beta material;
- and (3) treating said calcined, nickel- and molybdenum-impregnated zeolite Beta material with a sulfur-containing fluid comprising about 1 to about 99 mole % hydrogen and about 1 to about 99 mole % of a sulfur compound selected from the group consisting of carbon disulfide, carbonyl sulfide, hydrogen sulfide, thiophene, alkyl mercaptans, alkyl sulfides, ammonium sulfide, mercaptoalcohols, and combinations of any two or more thereof, at a temperature of about 300.degree.-500.degree. C.;
- and
- said reaction condition comprises a liquid hourly space velocity of said fluid feed in the range of about 0.1 ft.sup.3 /ft.sup.3 catalyst/hour to about 10 ft.sup.3 /ft.sup.3 catalyst/hour, a gas hourly space velocity of said hydrogen in the range of about 10 ft.sup.3 /ft.sup.3 catalyst/hour to about 100 ft.sup.3 /ft.sup.3 catalyst/hour, a molar ratio of hydrogen to said fluid feed in the range of about 0.5:1 to about 5:1, a reaction pressure in the range of about 50 psig to about 750 psig, and a reaction temperature in the range of about 250.degree. C. to about 750.degree. C.
A hydrodealkylation process comprising contacting a fluid feed with hydrogen gas in the presence of a catalyst under a sufficient reaction condition to effect the production of an aromatic hydrocarbon containing 6 to 8 carbon atoms per molecule wherein:
- said fluid feed comprises a C.sub.9 + aromatic hydrocarbon;
- said catalyst comprises about 50 to about 95 weight % zeolite Beta, about 0.1 to about 10 weight % nickel, about 0.5 to about 20 weight % molybdenum, and about 0.1 to about 10 weight % sulfur;
- the preparation of said catalyst comprises the steps of:
- (1) impregnating a zeolite Beta material with compounds of nickel and molybdenum to produce a nickel- and molybdenum-impregnated zeolite Beta material;
- (2) calcining said nickel- and molybdenum-impregnated zeolite Beta material to produce a calcined, nickel-and molybdenum-impregnated zeolite Beta material, (3) reducing said calcined, nickel- and molybdenum-impregnated zeolite Beta material, and thereafter (4) treating said calcined, nickel- and molybdenum-impregnated zeolite Beta material with a solution of a sulfide selected from the group consisting of hydrogen sulfide, ammonium sulfide, alkali metal sulfides, and combinations of any two or more thereof;
- and
- said reaction condition comprises a liquid hourly space velocity of said fluid in the range of about 0.1 ft.sup.3 /ft.sup.3 catalyst/hour to about 10 ft.sup.3 /ft.sup.3 catalyst/hour, a gas hourly space velocity of said hydrogen in the range of about 10 ft.sup.3 /ft.sup.3 catalyst/hour to about 100 ft.sup.3 /ft.sup.3 catalyst/hour, a molar ratio of hydrogen to said fluid in the range of about 0.5:1 to about 5:1, a reaction pressure in the range of about 50 psig to about 750 psig, and a reaction temperature in the range of about 250.degree. C. to about 750.degree. C.
Dependencies are inferred from the claim text.