Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
222 words
A method of preparing benzene and xylenes from catalysates of reforming of gasoline fractions comprising a mixture of aromatic C 6 -C 10 hydrocarbons and non-aromatic hydrocarbons comprising: separating a low-boiling fraction from said reforming catalysate by distillation at a temperature of from 90° to 108° C.; treating the remaining high-boiling fraction comprising toluene, C 8 -C 10 aromatic hydrocarbons and paraffin hydrocarbons, in the presence of a hydrogen-containing gas at a temperature within the range of from 450° to 600° C. under a pressure of from 10 to 60 atm in contact with a catalyst consisting of 1 to 85% by weight of H-mordenite, 0.1 to 10% by weight of a hydrogenating component selected from the group consisting of: (a) oxides or sulfide of molybdenum; (b) oxides or sulfides of molybdenum combined with nickel; (c) oxides or sulfides of molybdenum combined with cobalt; and (d) platinum; the balance being constituted by a binder, to produce a liquid aromatic hydrocarbon product; subjecting said liquid aromatic hydrocarbon product to rectification to produce benzene, toluene, total xylenes and C 9 -C 10 aromatic hydrocarbons; separating p- and o-xylenes from the total xylenes; separating the benzene; recycling to the high-boiling fraction treatment a stream selected from the group consisting of toluene, toluene+aromatic C 9 -C 10 hydrocarbons, and toluene+ aromatic C 9 -C 10 hydrocarbons+m-xylene.
Claim 2
Independent Claim
222 words
A method of preparing benzene and xylenes from catalysates of reforming of gasoline fractions comprising a mixture of aromatic C 6 -C 10 hydrocarbons and non-aromatic hydrocarbons comprising: separating a low-boiling fraction from said reforming catalysate by distillation at a temperature of from 90° to 108° C.; treating the remaining high-boiling fraction comprising toluene, C 8 -C 10 aromatic hydrocarbons and paraffin hydrocarbons, in the presence of a hydrogen-containing gas at a temperature within the range of from 450° to 600° C. under a pressure of from 10 to 60 atm in contact with a catalyst consisting of 1 to 85% by weight of H-mordenite, 0.1 to 10% by weight of a hydrogenating component selected from the group consisting of: (a) oxides or sulfide of molybdenum; (b) oxides or sulfides of molybdenum combined with nickel; (c) oxides or sulfides of molybdenum combined with cobalt; and (d) platinum; the balance being constituted by a binder, to produce a liquid aromatic hydrocarbon product; subjecting said liquid aromatic hydrocarbon product to rectification to produce benzene, toluene, total xylenes and C 9 -C 10 aromatic hydrocarbons; separating p- and o-xylenes from the total xylenes; separating the benzene; recycling to the high-boiling fraction treatment a stream selected from the group consisting of toluene, toluene+aromatic C 9 -C 10 hydrocarbons, and toluene+ aromatic C 9 -C 10 hydrocarbons+m-xylene.
Claim 3
Dependent Claim
28 words
A method as claimed in claim 1, wherein recycled to said stage of treatment of the high-boiling fraction is toluene along with aromatic C 9 -C 10 hydrocarbons.
Claim 4
Dependent Claim
42 words
A method as claimed in claim 1, wherein recycled to said stage of treatment of the high-boiling fraction is toluene along with aromatic C 9 -C 10 hydrocarbons and concentrate of m-xylene remaining after separation of o- and p-xylenes from total xylenes.
Claim 5
Dependent Claim
84 words
A method as claimed in claim 1, wherein the process is conducted at a space velocity of supply of the starting feed with the recycle to said stage of treatment of the high-boiling fraction within the range of from 1 to 8 volumes per one volume of the catalyst per hour, circulation ratio of the hydrogen-containing gas of from 600 to 2,000 nl/l of the liquid feed with the recycle and a content of hydrogen in the gas of at least 50% by volume.
Claim 6
Dependent Claim
18 words
A method as claimed in claim 1, wherein the recovered benzene is purified from impurities of non-aromatic hydrocarbons.
Claim 7
Dependent Claim
29 words
A method as claimed in claim 1, wherein the recovered benzene is mixed with the low-boiling fraction of the reforming catalysate and pure benzene is isolated from said mixture.
Claim 8
Dependent Claim
31 words
A method as claimed in claim 1, wherein n-mordenite contains alkali-earth and/or rare-earth metals in an amount equivalent to a degree of substitution of hydrogen in n-mordenite of up to 50%.
Claim 9
Dependent Claim
16 words
A method as claimed in claim 1, wherein as the binder use is made of alumina.
Claim 10
Dependent Claim
21 words
A method as claimed in claim 1, wherein the low-boiling fraction constitutes 20 to 35% by weight of the reforming catalysate.
Claim 11
Dependent Claim
37 words
A method as claimed in claim 1, wherein the high-boiling fraction comprises toluene, aromatic C 8 -C 9 hydrocarbons, and paraffin hydrocarbons, wherein the amount of paraffin hydrocarbons in said high-boiling fraction is below 15% by weight.
Claim 12
Dependent Claim
21 words
A method as claimed in claim 1, wherein molybdenum is a catalyst component in the form of an oxide or sulphide.
Claim 13
Dependent Claim
14 words
A method as claimed in claim 1, wherein the recycled stream is primarily toluene.
Claim 14
Dependent Claim
21 words
A method as claimed in claim 1, wherein the recycled stream is primarily toluene and aromatic C 9 -C 10 hydrocarbons.
Claim 15
Dependent Claim
22 words
A method as claimed in claim 1, wherein the recycled stream is primarily toluene, aromatic C 9 -C 10 hydrocarbons and m-xylenes.