Process for producing caking additive for coke production and process for producing coke

1. A caking additive for coke production consisting of a solvent deasphalted pitch, wherein the caking additive for coke production has a softening point within a range from 179 to 200° C., an amount of carbon residue within a range from 30 to 70% by mass, and an atomic ratio of hydrogen to carbon of not more than 1.2.

2. A caking additive for coke production according to claim 1 , wherein the solvent deasphalted pitch is sediment extracted by using a light reformate containing 5 to 15% by volume of butane, 60 to 80% by volume of pentane, and 5 to 30% by volume of hexane as a solvent.

3. A coke comprising a caking additive for coke production according to claim 1 .

4. A caking additive for coke production according to claim 1 and produced by a process for producing a caking additive, the process comprising:

a step of extracting the solvent deasphalted pitch that can be used as the caking additive for coke production from a residue comprising at least one of an atmospheric residue obtained by atmospheric distillation of a crude oil and a vacuum residue obtained by atmospheric distillation and vacuum distillation of a crude oil,

wherein the extracting is performed using, as a solvent, a light reformate obtained by catalytic reforming a naphtha fraction that is fractionated from crude oil by atmospheric distillation of the crude oil.

5. A caking additive for coke production according to claim 4 , wherein the light reformate contains 5 to 15% by volume of butane, 60 to 80% by volume of pentane, and 5 to 30% by volume of hexane.

6. A caking additive for coke production according to claim 4 , wherein the step of extracting is performed using an extraction temperature within a range from 150 to 200° C., and a flow rate ratio between the solvent and the residue (solvent/residue) within a range from 5/1 to 8/1.

7. A coke comprising a caking additive for coke production according to claim 4 .

8. A process for producing coke, the process comprising:

a step of extracting a solvent deasphalted pitch that can be used as a caking additive for coke production from a residue comprising at least one of an atmospheric residue obtained by atmospheric distillation of a crude oil and a vacuum residue obtained by atmospheric distillation and vacuum distillation of a crude oil, wherein the extracting is performed using, as a solvent, a light reformate obtained by catalytic reforming a naphtha fraction that is fractionated from a crude oil by atmospheric distillation of the crude oil, and

a step of producing a coke by performing dry distillation of a raw material coal for coke production that comprises the solvent deasphalted pitch,

wherein the caking additive for coke production has a softening point within a range from 179 to 200° C., an amount of carbon residue within a range from 30 to 70% by mass, and an atomic ratio of hydrogen to carbon of not more than 1.2.

9. The process for producing coke according to claim 8 , wherein the raw material coal for coke production comprises 0.5 to 10% by mass of the solvent deasphalted pitch.

10. The process for producing coke according to claim 8 , wherein the raw material coal for coke production comprises 10 to 50% by mass of a non-caking coal or slightly caking coal.

11. The process for producing coke according to claim 9 , wherein the raw material coal for coke production comprises 10 to 50% by mass of a non-caking coal or slightly caking coal.