Coke with additives
Coke including additives that are accumulated at the yield points or in the regions surrounded by the yield points. For homogeneous distribution, the additives are continuously dosed into the delayed coker during the filling time. The dosing can be carried out by powdery blowing with an inert gas (nitrogen) or also distributed in a slurry consisting of the reaction components and a partial flow of the coker feed (vacuum resid, pytar, decant oil or coal-tar distillates). According to an advantageous form of embodiment, the additives may optionally have a diameter of between 0.05 mm and 5 mm, preferably between 1 mm and 3 mm. Advantageously, the additives can be selected from at least one of acetylene coke, fluid coke, flexi coke, shot coke, carbon black, non-graphitisable carbons (chars), non-graphitic anthracite, silicon carbide, titanium carbide, titanium diboride or mixtures thereof.
1. A coke comprising:
additives different from the coke to enable tailoring of properties of the coke by accumulation of the additives in the coke, the additives being selected from the group consisting of silicon carbide, titanium carbide, titanium diboride and mixtures thereof,
wherein the additives are accumulated in the coke at yield points defined by boundaries between optically non-anisotropic regions which have been created when a mesophase has set during coking, in the regions surrounded by the yield points, or accumulated at both the yield points and embedded in the regions surrounded by the yield points, and
wherein the additives have a diameter of 0.1 μm to 49 μm or a diameter of 0.5 mm to 5 mm, or
wherein the additives are present as a mixture of additives with a diameter of 0.1 μm to 49 μm and a diameter of 0.5 mm to 5 mm.
2. The coke according to claim 1 , wherein the coke is selected from the group consisting of petroleum coke, coal-tar pitch coke, coke obtained from residues of coal gasification, coke obtained from residues of coal hydrogenation, coke obtained from Fischer-Tropsch synthesis, coke obtained from a petrol/coal-tar pitch mixture obtained from a mixture of petrol and coal-tar pitch residues, and any mixture thereof.
3. The coke according to claim 1 , wherein the additives are accumulated at both the yield points and embedded in the regions surrounded by the yield points.
4. The coke according to claim 1 , wherein the coke comprises 0.5 to 8 wt.-% of additives.
5. The coke according to claim 1 , wherein the coke comprises 1 to 40 wt.-% of additives.
6. The coke according to claim 1 , wherein the coke comprises 0.5 to 8 wt.-% of the additives with a diameter of 0.1 μm to 49 μm and 5 to 20 wt.-% of the additives with a diameter of 0.05 mm to 5 mm.
7. The coke according to claim 1 , wherein the additives are accumulated at the yield points or embedded in the regions surrounded by the yield points.