US4855529A — Isomerization process with preliminary normal par…

Claim 1

Independent Claim 178 words

A process for the isomerization of paraffins from a mixed hydrocarbon stream comprising normal paraffins, mono-methyl-branched paraffins, di-methyl-branched paraffins, said process comprising: (a) passing said mixed hydrocarbon stream to a feed separation zone comprising a shape-selective separatory molecular sieve having an intermediate pore size of 5.5×5.5 to 4.5×4.5A and excluding 4.5×4.5A, said pore size being sufficient to permit entry of said normal paraffins and said mono-methyl-branched paraffins but restrictive to prohibit entry of di-branched paraffins; (b) separating, in said feed separation zone, at separation conditions, by means of said shape-selective separatory sieve, said di-branched paraffins from said normal paraffins and mono-methyl- branched paraffins; (c) recovering from said feed separation zone a feed separation zone effluent stream comprising said di-branched paraffins; (d) recovering from said feed separation zone an isomerization feed stream comprising said normal paraffins and said monomethyl-branched paraffins; (e) passing at least a portion of said isomerization feed stream to an isomerization zone maintained at isomerization conditions and containing an isomerization catalyst to produce an isomerization zone effluent stream comprising di-branched paraffins, mono-methylbranched paraffins and normal paraffins.

Claim 2

Dependent Claim 178 words

A process for the isomerization of paraffins from a mixed hydrocarbon stream comprising normal paraffins, mono-methyl-branched paraffins, di-methyl-branched paraffins, said process comprising: (a) passing said mixed hydrocarbon stream to a feed separation zone comprising a shape-selective separatory molecular sieve having an intermediate pore size of 5.5×5.5 to 4.5×4.5A and excluding 4.5×4.5A, said pore size being sufficient to permit entry of said normal paraffins and said mono-methyl-branched paraffins but restrictive to prohibit entry of di-branched paraffins; (b) separating, in said feed separation zone, at separation conditions, by means of said shape-selective separatory sieve, said di-branched paraffins from said normal paraffins and mono-methyl- branched paraffins; (c) recovering from said feed separation zone a feed separation zone effluent stream comprising said di-branched paraffins; (d) recovering from said feed separation zone an isomerization feed stream comprising said normal paraffins and said monomethyl-branched paraffins; (e) passing at least a portion of said isomerization feed stream to an isomerization zone maintained at isomerization conditions and containing an isomerization catalyst to produce an isomerization zone effluent stream comprising di-branched paraffins, mono-methylbranched paraffins and normal paraffins.

Claim 3

Dependent Claim 81 words

The process of claim 1 wherein at least a portion of said isomerization zone effluent stream is passed to a product separation zone containing a select shape-selective zeolite to separate, at separation conditions, said di-branched paraffins and said mono-methyl branched paraffins from said normal paraffins of said isomerization effluent stream and to form an isomerization zone recycle stream comprising normal paraffins; and recovering at least a portion of said di-branched paraffins and mono-methyl-branched paraffins as a product separation zone effluent stream.

Claim 4

Dependent Claim 30 words

The process of claim 1 wherein said isomerization conditions include a temperature of 200° C. to 400° C. and a pressure of from about 10 bar to about 40 bar.

Claim 5

Dependent Claim 19 words

The process of claim 1 wherein said isomerization catalyst comprises an aluminosilicate having a Group VIII metal deposited therewith.

Claim 6

Dependent Claim 17 words

The process of claim 4 wherein said aluminosilicate is mordenite and said Group VIII metal is platinum.

Claim 7

Dependent Claim 22 words

The process of claim 5 wherein said platinum is present in a weight concentration of from about 0.2 to about 0.4 wt%.

Claim 8

Dependent Claim 14 words

The process of claim 5 wherein said mordenite has associated therewith an inorganic binder.

Claim 9

Dependent Claim 18 words

The process of claim 1 wherein said shape-selective molecular sieve of said feed separation zone comprises synthetic ferrierite.

Claim 10

Dependent Claim 11 words

The process of claim 1 wherein said aluminosilicate comprises natural ferrierite.

Claim 11

Dependent Claim 21 words

The process of claim 1 wherein said shape-selective molecular sieve is selected from the group consisting of tectosilicates, aluminophosphates and silicoaluminophosphates.

Claim 12

Dependent Claim 18 words

The process of claim 10 wherein said tectosilicates are selected from the group consisting of aluminosilicates and borosilicates.

Claim 13

Dependent Claim 37 words

The process of claim 1 wherein said shape-selective separatory sieve of said feed separation zone comprises ferrierite having cations exchanged therein selected from the group consisting of an alkali metal, alkaline earth metal and transition metal cations.

Claim 14

Dependent Claim 33 words

The process of claim 1 wherein said separation conditions include a temperature of from about 75° C. to about 400° C. and a pressure of from about 2 bar to about 42 bar.

Claim 15

Dependent Claim 27 words

The process of claim 1 wherein said di-branched paraffins recovered in step (c) comprise 2,3-di-methylbutane and wherein said mono-methyl-branched paraffins recovered in step (d) comprise 3-methyl pentane.

Claim 16

Dependent Claim 28 words

The process of claim 2 wherein said feed separation zone effluent stream and said product separation zone effluent stream are admixed before blending with a gasoline range hydrocarbon.

Claim 17

Dependent Claim 47 words

The process of claim 2 wherein said feed separation zone effluent stream and said product separation zone effluent stream are combined and wherein said combined stream comprises an isomerate gasoline blending stream containing a predominant amount of di-methyl-branched paraffins and a minor amount of said mono-methyl-branched paraffins.

Claim 18

Dependent Claim 49 words

The process of claim 1 wherein said mixed hydrocarbon feed stream contains aromatic and naphthenic hydrocarbons and wherein said shape-selective separatory sieve is restrictive to prohibit entry of said aromatic and naphthenic hydrocarbons and wherein said aromatic and naphthenic hydrocarbons are recovered with said feed separation zone effluent stream.

Claim 19

Dependent Claim 34 words

The process of claim 2 wherein said product separation zone comprises a calcium 5A zeolite sufficient to permit adsorption of said normal paraffins and restrictive to adsorption of said mono-methyl-branched paraffins and di-branched paraffins.

Claim 20

Dependent Claim 66 words

The process of claim 2 wherein said product separation zone effluent stream is passed to a subsequent product separation zone containing a shape-selective molecular sieve to separate, at separation conditions, di-branched paraffins from mono-methyl branched paraffins and to form an isomerization zone recycle stream comprising mono-methyl branched paraffins and recovering at least a portion of said di-branched paraffins as a subsequent product separation zone effluent stream.

Claim 21

Dependent Claim 28 words

The process of claim 19 wherein said select shape-selective molecular sieve of said subsequent product separation zone has a pore diameter between 4.5×4.5A and 5.5×5.5A and excluding 4.5×4.5A.

Claim 22

Dependent Claim 11 words

The process of claim 20 wherein said molecular sieve comprises ferrierite.

Claim 23

Dependent Claim 74 words

The process of claim 1 wherein at least a portion of said isomerization zone effluent stream is passed to a product separation zone comprising a select shape-selective zeolite to separate, at separation conditions, said di-branched paraffins from said mono-methyl branched paraffins and normal paraffins and to form an isomerization zone recycle stream comprising normal paraffins and mono-methyl branched paraffins; and recovering at least a portion of said di-branched paraffins as a product effluent stream.

Claim 24

Dependent Claim 26 words

The process of claim 22 wherein said select shape-selective zeolite of said product separation zone has a pore diameter between 4.5×4.5A and 5.5×5.5A and excluding 4.5×4.5A.

Claim 25

Dependent Claim 11 words

The process of claim 22 wherein said shape-selective zeolite comprises ferrierite.

Claim 26

Dependent Claim 45 words

The process of claim 2 wherein said product separation zone effluent stream comprising di-branched paraffins and mono-methyl branched paraffins is separated by a separation means to provide a subsequent product effluent stream comprising di-branched paraffins and an isomerization zone recycle stream comprising mono-methyl branched paraffins.

Claim 27

Dependent Claim 23 words

The process of claim 1 wherein at least a portion of said isomerization zone effluent stream is recycled to said feed separation zone.

Claim 28

Dependent Claim 30 words

The process of claim 1 wherein said isomerization zone effluent streams is separated to yield an issomerization zone recycle stream comprising normal paraffins which are recycled to said isomerization zone.

Claim 29

Dependent Claim 163 words

A process for the preparation of an isomerate from a hydrocarbon feed stream mixture containing normal hexane, methyl pentanes and di-methyl butane which comprises: (1) passing said feed stream to a feed separation zone containing a separatory shape-selective molecular sieve having an intermediate pore size of 5.5×5.5 to 4.5×4.5A and excluding 4.5×4.5A, said shape-selective molecular sieve being effective to permit entry of said normal hexane and mono-methylpentanes and restrictive to prohibit entry of said dimethyl butane and to thereby separate said dimethyl butane from said normal hexane and mono-methylpentanes; (2) recovering said dimethyl butanes as a feed separation zone effluent stream; (3) recovering adsorbed normal hexane and mono-methylpentanes and passing said normal hexane and mono-methylpentane to an isomerization zone and isomerizing, at isomerization conditions, in the presence of an isomerization catalyst said normal hexane to methyl pentanes and dimethyl butane; and isomerizing said mono-methylpentanes to dimethyl butane, and (4) forming an isomerization effluent isomerate stream comprising unisomerized normal hexane, mono-methylpentanes and dimethyl butane.

Claim 30

Dependent Claim 163 words

A process for the preparation of an isomerate from a hydrocarbon feed stream mixture containing normal hexane, methyl pentanes and di-methyl butane which comprises: (1) passing said feed stream to a feed separation zone containing a separatory shape-selective molecular sieve having an intermediate pore size of 5.5×5.5 to 4.5×4.5A and excluding 4.5×4.5A, said shape-selective molecular sieve being effective to permit entry of said normal hexane and mono-methylpentanes and restrictive to prohibit entry of said dimethyl butane and to thereby separate said dimethyl butane from said normal hexane and mono-methylpentanes; (2) recovering said dimethyl butanes as a feed separation zone effluent stream; (3) recovering adsorbed normal hexane and mono-methylpentanes and passing said normal hexane and mono-methylpentane to an isomerization zone and isomerizing, at isomerization conditions, in the presence of an isomerization catalyst said normal hexane to methyl pentanes and dimethyl butane; and isomerizing said mono-methylpentanes to dimethyl butane, and (4) forming an isomerization effluent isomerate stream comprising unisomerized normal hexane, mono-methylpentanes and dimethyl butane.

Claim 31

Dependent Claim 86 words

The process of claim 28 wherein at least a portion of said isomerization effluent stream is passed to a product separation zone containing a shape-selective separatory molecular sieve with a pore size equal to or smaller than 4.5×4.5A thereby permitting adsorption of said normal hexane while eluting said methylpentanes and said dimethyl butane, wherein said adsorbed normal hexane is recovered and at least a portion thereof is recycled to said isomerization zone and recovering said mono-methylpentanes and dimethyl butanes as a product separation zone isomerate effluent.

Claim 32

Dependent Claim 21 words

The process of claim 28 wherein said shape-selective molecular sieve is selected from the group consisting of tectosilicates, aluminophosphates and silicoaluminophosphates.

Claim 33

Dependent Claim 23 words

The process of claim 29 wherein said product separation zone isomerate effluent comprising dimethylbutanes and mono-methylpentanes is passed to said feed separation zone.

Claim 34

Dependent Claim 12 words

The process of claim 30 wherein said tectosilicates comprise aluminosilicates and borosilicates.

Claim 35

Dependent Claim 10 words

The process of claim 32 wherein said aluminosilicate comprises ferrierite.

Claim 36

Dependent Claim 17 words

The process of claim 28 wherein said isomerization catalyst comprises a mordenite aluminosilicate having platinum dispersed thereon.

Claim 37

Dependent Claim 23 words

The process of claim 34 wherein said platinum is present in a weight content of from about 0.005 wt% to about 10.0 wt%.

Claim 38

Dependent Claim 22 words

The process of claim 28 wherein said isomerization catalyst comprises a Y faujausite sieve having 0.2 to 1.4 wt% platinum dispersed thereon.

Claim 39

Dependent Claim 51 words

The process of claim 28 wherein said feed stream is comprised of normal hexane, methyl pentanes, dimethyl butane, aromatics and naphthenes, wherein said aromatics and naphthenes are not adsorbed in said separatory shape selective molecular sieve and wherein said aromatics and naphthenes are recovered in said feed separation zone effluent stream.

Claim 40

Dependent Claim 44 words

The process of claim 29 wherein said feed separation effluent stream is comprised of dimethyl butanes and said product separation zone isomerate effluent is comprised of methyl pentanes and dimethyl butanes, wherein said streams are combined to form a combined isomerate gasoline blending component.

Claim 41

Dependent Claim 12 words

The process of claim 38 wherein said dimethyl butane is 2,3-dimethyl butane.

Claim 42

Dependent Claim 19 words

The process of claim 29 wherein said shape-selective separatory molecular sieve in said product separation zone comprises calcium 5A.

Claim 43

Dependent Claim 59 words

The process of claim 29 wherein said first product separation zone isomerate effluent stream is passed to a product separation zone containing a shape-selective molecular sieve to separate, at separation conditions, mono-methylpentanes from dimethylbutane, to form an isomerization zone recycle stream comprising mono-methyl pentanes and wherein said dimethylbutanes are recovered as a subsequent product separation zone isomerate effluent stream.

Claim 44

Dependent Claim 53 words

The process of claim 41 wherein both said feed separation zone and said product separation zone contains a ferrierite zeolite, wherein both said zones are maintained at separation conditions including a temperature of from about 75° C. to about 400° C. and a pressure of from about 2 bar to about 42 bar.

Claim 45

Dependent Claim 26 words

The process of claim 41 wherein said shape-selective molecular sieve of said product separation zone has a pore diameter between 4.5×4.5A and 5.5×5.5A and excluding 4.5×4.5A.

Claim 46

Dependent Claim 19 words

The process of claim 28 wherein said effluent isomerate stream is combined with said feed separation zone effluent stream.

Claim 47

Dependent Claim 41 words

The process of claim 28 wherein said isomerization zone isomerate effluent stream comprises dimethylbutanes, mono-methylpentanes, and normal hexane, wherein at least a portion of said isomerization zone isomerate effluent stream is passed to said feed separation zone as a recycle stream.

Claim 48

Dependent Claim 38 words

The process of claim 28 wherein said isomerization zone effluent stream undergoes separation to yield an isomerization zone recycle stream comprising normal hexane which is passed to said isomerization zone to isomerize said normal hexane mono-methylpentanes and dimethylbutane.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1992-08-07	1993-02-06	1993-08-08	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1996-08-07	1997-02-06	1997-08-08	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2000-08-07	2001-02-06	2001-08-08	$7700.00	Window Closed / Lapsed

Isomerization process with preliminary normal paraffin and mono-methyl paraffin feed capture step

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