Carbon fiber reinforced coke from the delayed coker
First Claim
1. A carbon fiber-reinforced coke, comprising:
- a mixture of;
a proportion of cut carbon fibers being surface-oxidized or non-surface-oxidized or stabilized precursor fibers for forming PAN-based carbon fibers, and at least one of the following being true for said cut carbon fibers or stabilized precursor fibers upon entering the delayed coker, said fibers or precursor fibers;
not being provided with a sizing;
orbeing provided with a sizing selected from the group consisting of sizings for satisfying objectives of various textile processes;
orbeing provided with a sizing selected from the groups consisting of;
waxes, montan waxes, and waxes produced synthetically by esterification of fatty alcohols with long-chain fatty acids containing 12 to 40 carbon atoms;
polyurethane, phenolic, polyester, and epoxy resins; and
low-viscosity pitches and pitches dissolved in organic solvents;
feedstock for a delayed coking process, said feedstock including a material selected from the group consisting of highly aromatic residues of vacuum distillation, residues of visbreaking, residues of a fluidized catalytic cracking process, residues of thermocracking, residues of ethylene pyrolysis, soft pitches produced from coal coking or by distillation of highly aromatic coal residues;
the mixture having been coked in a delayed coker;
said feedstock, upon entering the delayed coker, containing at most 4% by weight of said cut carbon fibers or at most 8% by weight of said stabilized precursor fibers; and
the coke having a coefficient of thermal expansion with values of at most 0.15×
10−
6K−
1, measured on specimens produced in accordance with DIN 51930 in an extrusion direction and in accordance with DIN 51909.
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Accused Products
Abstract
A number of properties of polygranular carbon bodies can be improved by small quantities of carbon fibers being incorporated in the formulations for production of such bodies. However, it has proven difficult for carbon fibers to be introduced into the green mixture. Therefore, a high-grade coke, preferably needle coke, in accordance with the invention is used to produce the polygranular carbon bodies. This high-grade coke according to the invention contains the carbon fibers simply as a result of being produced in the delayed coker of a refinery. All the main details of the way in which a coke of this type is mixed into the green mixture correspond to the reliably managed processing of other needle cokes.
28 Citations
12 Claims
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1. A carbon fiber-reinforced coke, comprising:
-
a mixture of; a proportion of cut carbon fibers being surface-oxidized or non-surface-oxidized or stabilized precursor fibers for forming PAN-based carbon fibers, and at least one of the following being true for said cut carbon fibers or stabilized precursor fibers upon entering the delayed coker, said fibers or precursor fibers; not being provided with a sizing;
orbeing provided with a sizing selected from the group consisting of sizings for satisfying objectives of various textile processes;
orbeing provided with a sizing selected from the groups consisting of; waxes, montan waxes, and waxes produced synthetically by esterification of fatty alcohols with long-chain fatty acids containing 12 to 40 carbon atoms; polyurethane, phenolic, polyester, and epoxy resins; and low-viscosity pitches and pitches dissolved in organic solvents; feedstock for a delayed coking process, said feedstock including a material selected from the group consisting of highly aromatic residues of vacuum distillation, residues of visbreaking, residues of a fluidized catalytic cracking process, residues of thermocracking, residues of ethylene pyrolysis, soft pitches produced from coal coking or by distillation of highly aromatic coal residues; the mixture having been coked in a delayed coker; said feedstock, upon entering the delayed coker, containing at most 4% by weight of said cut carbon fibers or at most 8% by weight of said stabilized precursor fibers; and the coke having a coefficient of thermal expansion with values of at most 0.15×
10−
6K−
1, measured on specimens produced in accordance with DIN 51930 in an extrusion direction and in accordance with DIN 51909. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of producing carbon fiber-reinforced coke, which comprises:
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mixing surface-oxidized or nonsurface-oxidized cut carbon fibers or stabilized precursor fibers for forming PAN-based carbon fibers into a flow of incoming feedstock to a delayed coking process to form a mixture, the feedstock being selected from the group of highly aromatic residues of vacuum distillation, of visbreaking, of the fluidized catalytic cracking process, of thermocracking, of ethylene pyrolysis or soft pitches produced from coal coking or by distillation of the highly aromatic coal residues; at least one of the following being true for the cut carbon fibers or stabilized precursor fibers upon entering the delayed coker, the fibers or precursor fibers; not being provided with a sizing;
orbeing provided with a Sizing selected from the group consisting of sizings for satisfying objectives of various textile processes;
orbeing provided with a sizing selected from the groups consisting of; waxes, montan waxes, and waxes produced synthetically by esterification of fatty alcohols with long-chain fatty acids containing 12 to 40 carbon atoms; polyurethane, phenolic, polyester, and epoxy resins; and low-viscosity pitches and pitches dissolved in organic solvents; and coking the mixture in a delayed coker; the feedstock, upon entering the delayed coker, containing at most 4% by weight of the cut carbon fibers or at most 8% by weight of the stabilized precursor fibers; and the coke having a coefficient of thermal expansion with values of at most 0.15×
10−
6K−
1, measured on specimens produced in accordance with DIN 51930 in an extrusion direction and in accordance with DIN 51909. - View Dependent Claims (12)
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Specification