US4427530A — Aromatic pitch derived from a middle fraction of …

Claim 1

Independent Claim 67 words

A pitch suitable for carbon artifact manufacture, comprising by weight content between 80 and 100 percent toluene insolubles, said pitch having been derived, by heat soaking followed by vacuum stripping, from a deasphaltenated middle fraction of a cat cracker bottom feedstock which is rich in 4, 5 and 6 polycondensed aromatic rings, and wherein said pitch is further characterized as being relatively free of impurities and ash.

Claim 2

Dependent Claim 67 words

A pitch suitable for carbon artifact manufacture, comprising by weight content between 80 and 100 percent toluene insolubles, said pitch having been derived, by heat soaking followed by vacuum stripping, from a deasphaltenated middle fraction of a cat cracker bottom feedstock which is rich in 4, 5 and 6 polycondensed aromatic rings, and wherein said pitch is further characterized as being relatively free of impurities and ash.

Claim 3

Dependent Claim 27 words

The pitch of claim 1, wherein said middle fraction is a distillate fraction boiling off at temperatures approximately between 427° and 510° C. at 760 mm mercury.

Claim 4

Dependent Claim 72 words

A pitch suitable for carbon artifact manufacture, such as the manufacture of carbon fibers, comprising by weight content between 80 and 100 percent toluene insolubles, and derived, by heat soaking followed by vacuum stripping, from a deasphaltenated middle distillate fraction of a cat cracker bottom boiling off at temperatures approximately between 427° and 510° C. at 760 mm mercury, said pitch being further characterized as being relatively free of impurities and ash.

Claim 5

Dependent Claim 72 words

A pitch suitable for carbon artifact manufacture, such as the manufacture of carbon fibers, comprising by weight content between 80 and 100 percent toluene insolubles, and derived, by heat soaking followed by vacuum stripping, from a deasphaltenated middle distillate fraction of a cat cracker bottom boiling off at temperatures approximately between 427° and 510° C. at 760 mm mercury, said pitch being further characterized as being relatively free of impurities and ash.

Claim 6

Dependent Claim 19 words

The pitch of claim 3, wherein said middle fraction is rich in 4, 5, and 6 polycondensed aromatic rings.

Claim 7

Dependent Claim 70 words

A pitch suitable for carbon artifact manufacture, comprising by weight content between 80 and 100 percent toluene insolubles, said pitch having been derived, by heat soaking followed by vacuum stripping, from a deasphaltenated middle fraction of a cat cracker bottom feedstock which is rich in 4, 5 and 6 polycondensed aromatic rings, and wherein said pitch is further characterized as having approximately less than 15 percent quinolline insolubles by weight.

Claim 8

Dependent Claim 70 words

A pitch suitable for carbon artifact manufacture, comprising by weight content between 80 and 100 percent toluene insolubles, said pitch having been derived, by heat soaking followed by vacuum stripping, from a deasphaltenated middle fraction of a cat cracker bottom feedstock which is rich in 4, 5 and 6 polycondensed aromatic rings, and wherein said pitch is further characterized as having approximately less than 15 percent quinolline insolubles by weight.

Claim 9

Dependent Claim 27 words

The pitch of claim 5, wherein said middle fraction is a distillate fraction boiling off at temperatures approximately between 427° and 510° C. at 760 mm mercury.

Claim 10

Dependent Claim 16 words

The pitch of claim 5, wherein said quinoline insolubles are less than 5 percent by weight.

Claim 11

Dependent Claim 94 words

A process for preparing a pitch suitable for carbon artifact manufacture, comprising the steps of: (a) obtaining a deasphaltenated middle fraction of a cat cracker bottom feedstock which is rich in 4, 5, and 6 polycondensed aromatic rings; (b) subjecting said middle fraction to heat soaking to produce a pitch intermediate; and (c) removing a light portion comprising oils from said pitch intermediate to produce a pitch comprising between 80 and 100 percent by weight of toluene insolubles, and which is further characterized as having approximately less than 15 percent quinoline insolubles by weight.

Claim 12

Dependent Claim 94 words

A process for preparing a pitch suitable for carbon artifact manufacture, comprising the steps of: (a) obtaining a deasphaltenated middle fraction of a cat cracker bottom feedstock which is rich in 4, 5, and 6 polycondensed aromatic rings; (b) subjecting said middle fraction to heat soaking to produce a pitch intermediate; and (c) removing a light portion comprising oils from said pitch intermediate to produce a pitch comprising between 80 and 100 percent by weight of toluene insolubles, and which is further characterized as having approximately less than 15 percent quinoline insolubles by weight.

Claim 13

Dependent Claim 43 words

The process of claim 8, wherein said thermal reaction includes heat soaking said middle fraction at a temperature in an approximate range of between 390° and 450° C. for a duration of from 1 minute to 20 hours at 760 mm of mercury.

Claim 14

Dependent Claim 26 words

The process of claim 9, wherein said middle fraction is heat soaked at approximately 430° C. for 7 to 9 hours at 760 mm of mercury.

Claim 15

Dependent Claim 33 words

The process of claim 8, wherein said middle fraction is obtained by distilling said feedstock at a temperature in an approximate range of between 427° and 510° C. at 760 mm of mercury.

Claim 16

Dependent Claim 47 words

The process of claim 8, wherein said portion of said pitch intermediate comprises oils, and further wherein said oils are removed by vacuum stripping said intermediate at a temperature in an approximate range of between 320° to 420° C. at approximately 0.1 to 100 mm of mercury.

Claim 17

Dependent Claim 84 words

A process for preparing a pitch suitable for carbon artifact manufacture comprising the steps of: (a) distilling a cat cracker bottom feedstock to obtain a deasphaltenated middle fraction rich in 4, 5 and 6 polycondensed aromatic rings; (b) heat soaking said middle fraction; and (c) vacuum stripping said heat soaked middle fraction to remove oils therefrom, resulting in a pitch comprising 80 to 100 percent by weight of toluene insolubles and further characterized as having approximately less than 15 percent quinoline insolubles by weight.

Claim 18

Dependent Claim 84 words

A process for preparing a pitch suitable for carbon artifact manufacture comprising the steps of: (a) distilling a cat cracker bottom feedstock to obtain a deasphaltenated middle fraction rich in 4, 5 and 6 polycondensed aromatic rings; (b) heat soaking said middle fraction; and (c) vacuum stripping said heat soaked middle fraction to remove oils therefrom, resulting in a pitch comprising 80 to 100 percent by weight of toluene insolubles and further characterized as having approximately less than 15 percent quinoline insolubles by weight.

Claim 19

Dependent Claim 45 words

The process of claim 13, wherein said heat soaking step (b) includes heat soaking said middle fraction at a temperature in an approximate range of between 390° and 450° C. for a duration of from 1 minute to 20 hours at 760 mm of mercury.

Claim 20

Dependent Claim 26 words

The process of claim 14, wherein said middle fraction is heat soaked at approximately 430° C. for 7 to 9 hours at 760 mm of mercury.

Claim 21

Dependent Claim 31 words

The process of claim 13, wherein said distilling step (a) includes distilling said feedstock at a temperature in an approximate range of 427° to 510° C. at 760 mm of mercury.

Claim 22

Dependent Claim 40 words

The process of claim 13, wherein said vacuum stripping step (c) includes vacuum stripping said heat soaked middle fraction at a temperature in an approximate range of between 320° and 420° C. at approximately 0.1 to 100 mm of mercury.

Claim 23

Dependent Claim 80 words

A process for preparing a pitch suitable for carbon artifact manufacture, comprising the steps of: (a) distilling a cat cracker bottom to obtain a deasphaltenated middle fraction rich in 4, 5 and 6 polycondensed aromatic rings; (b) heat soaking said middle fraction; and (c) vacuum stripping said heat soaked middle fraction to remove oils therefrom, resulting in a pitch comprising 80 to 100 percent by weight of toluene insolubles and further characterized as being relatively free of impurities and ash.

Claim 24

Dependent Claim 80 words

A process for preparing a pitch suitable for carbon artifact manufacture, comprising the steps of: (a) distilling a cat cracker bottom to obtain a deasphaltenated middle fraction rich in 4, 5 and 6 polycondensed aromatic rings; (b) heat soaking said middle fraction; and (c) vacuum stripping said heat soaked middle fraction to remove oils therefrom, resulting in a pitch comprising 80 to 100 percent by weight of toluene insolubles and further characterized as being relatively free of impurities and ash.

Claim 25

Dependent Claim 80 words

A pitch suitable for carbon artifact manufacture made by the process including the steps of: (a) distilling a cat cracker bottom to obtain a deasphaltenated middle fraction rich in 4, 5 and 6 polycondensed aromatic rings; (b) heat soaking said middle fraction; and (c) vacuum stripping said heat soaked middle fraction to remove oils therefrom, resulting in a pitch comprising 80 to 100 percent by weight of toluene insolubles and further characterized as being relatively free of impurities and ash.

Claim 26

Dependent Claim 80 words

A pitch suitable for carbon artifact manufacture made by the process including the steps of: (a) distilling a cat cracker bottom to obtain a deasphaltenated middle fraction rich in 4, 5 and 6 polycondensed aromatic rings; (b) heat soaking said middle fraction; and (c) vacuum stripping said heat soaked middle fraction to remove oils therefrom, resulting in a pitch comprising 80 to 100 percent by weight of toluene insolubles and further characterized as being relatively free of impurities and ash.

Claim 27

Dependent Claim 96 words

A process for preparing a pitch suitable for carbon artifact manufacture, comprising the steps of: (a) distilling a cat cracker bottom to obtain a deasphaltenated middle fraction rich in 4, 5 and 6 polycondensed aromatic rings; (b) heat soaking said middle fractions; and (c) vacuum stripping said heat soaked middle fraction to remove oils therefrom at a temperature approximately above 400° C. at from approximately 1 to 100 mm of mercury, resulting in a pitch comprising 80 to 100 percent by weight of toluene insolubles and further characterized as being relatively free of impurities and ash.

Claim 28

Dependent Claim 96 words

A process for preparing a pitch suitable for carbon artifact manufacture, comprising the steps of: (a) distilling a cat cracker bottom to obtain a deasphaltenated middle fraction rich in 4, 5 and 6 polycondensed aromatic rings; (b) heat soaking said middle fractions; and (c) vacuum stripping said heat soaked middle fraction to remove oils therefrom at a temperature approximately above 400° C. at from approximately 1 to 100 mm of mercury, resulting in a pitch comprising 80 to 100 percent by weight of toluene insolubles and further characterized as being relatively free of impurities and ash.

Claim 29

Dependent Claim 22 words

The process of claim 20, wherein said vacuum stripping step (c) is conducted at a temperature approximately from 400° to 425° C.

Claim 30

Dependent Claim 96 words

A pitch suitable for carbon artifact manufacture made by the process including the steps of: (a) distilling a cat cracker bottom to obtain a deasphaltenated middle fraction rich in 4, 5 and 6 polycondensed aromatic rings; (b) heat soaking said middle fraction; and (c) vacuum stripping said heat soaked middle fraction to remove oils therefrom at a temperature approximately above 400° C. at from approximately 1 to 100 mm of mercury, resulting in a pitch comprising 80 to 100 percent by weight of toluene insolubles and further characterized as being relatively free of impurities and ash.

Claim 31

Dependent Claim 96 words

A pitch suitable for carbon artifact manufacture made by the process including the steps of: (a) distilling a cat cracker bottom to obtain a deasphaltenated middle fraction rich in 4, 5 and 6 polycondensed aromatic rings; (b) heat soaking said middle fraction; and (c) vacuum stripping said heat soaked middle fraction to remove oils therefrom at a temperature approximately above 400° C. at from approximately 1 to 100 mm of mercury, resulting in a pitch comprising 80 to 100 percent by weight of toluene insolubles and further characterized as being relatively free of impurities and ash.

Claim 32

Dependent Claim 22 words

The pitch of claim 22, wherein said vacuum stripping step (c) is conducted at a temperature approximately from 400° to 425° C.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1987-01-23	1987-07-25	1988-01-24	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1991-01-23	1991-07-25	1992-01-24	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1995-01-23	1995-07-25	1996-01-24	$7700.00	Window Closed / Lapsed

Aromatic pitch derived from a middle fraction of a cat cracker bottom

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