Process for producing coke

Claim 2

A process for producing a coke, which comprises: uniformly dispersing and mixing 0.05 to 5 parts by weight of a carbonized product having an average aspect ratio of at least 1.5 and selected from the group consisting of pitch-based carbon fibers, polyacrylonitrile-based carbon fiber and carbon fibers formed by the vapor phase thermal decomposition of a hydrocarbon compound with 100 parts by weight of a starting material oil, and then coking the mixture by heating the mixture up to a temperature within the range of from 400° to 600° C. and maintaining the temperature within this range for an overall coking period of from 12 to 48 hours.

Claim 3

A process for producing a pitch-based coke, which comprises: uniformly dispersing and mixing 0.05 to 5 parts by weight of a carbonized product having an average aspect ratio of at least 1.5 and selected from the group consisting of pitch-based carbon fibers, polyacrylonitrile-based carbon fibers and carbon fibers formed by the vapor phase thermal decomposition of a hydrocarbon compound with 100 parts by weight of a starting material oil, and then coking the mixture by heating the mixture up to a temperature within the range of from 400° to 600° C. and maintaining the temperature within this range for an overall coking period of from 12 to 48 hours.

Claim 4

A process for producing a pitch-based coke, which comprises: uniformly dispersing and mixing 0.05 to 5 parts by weight of a carbonized product having an average aspect ratio of at least 1.5 and selected from the group consisting of pitch-based carbon fibers, polyacrylonitrile-based carbon fibers and carbon fibers formed by the vapor phase thermal decomposition of a hydrocarbon compound with 100 parts by weight of a starting material oil, and then coking the mixture by heating the mixture up to a temperature within the range of from 400° to 600° C. and maintaining the temperature within this range for an overall coking period of from 12 to 48 hours.

Claim 5

A process for producing a needle coke which comprises: uniformly dispersing and mixing 0.05 to 5 parts by weight of a carbonized product having an average aspect ratio of at least 1.5 and selected from the group consisting of pitch-based carbon fibers, polyacrylonitrile-based carbon fibers and carbon fibers formed by the vapor phase thermal decomposition of a hydrocarbon compound with 100 parts by weight of a starting material oil, and then coking the mixture by heating the mixture up to a temperature within the range of from 400° to 600° C. and maintaining the temperature within this range for an overall coking period of from 12 to 48 hours.

Claim 6

A process for producing a needle coke which comprises: uniformly dispersing and mixing 0.05 to 5 parts by weight of a carbonized product having an average aspect ratio of at least 1.5 and selected from the group consisting of pitch-based carbon fibers, polyacrylonitrile-based carbon fibers and carbon fibers formed by the vapor phase thermal decomposition of a hydrocarbon compound with 100 parts by weight of a starting material oil, and then coking the mixture by heating the mixture up to a temperature within the range of from 400° to 600° C. and maintaining the temperature within this range for an overall coking period of from 12 to 48 hours.

Claim 7

The process according to claim 3, wherein the carbonized product has an average aspect ratio of from 200 to 2,000.

Claim 8

The process according to claim 3, wherein the carbonized product has an average aspect ratio of from 15 to 3,000.

Claim 9

The process according to claim 3, wherein the carbonized product has been heat-treated at a temperature of at least 500° C.

Claim 10

The process according to claim 3, wherein the starting material oil is coal tar, coal tar pitch, petroleum heavy oil, a liquefied coal product or a residual oil from the decomposition of naphtha.