Process for the production of carbon black from at least one fcc slurry cut, comprising a specific hydrotreatment

A process for the production of carbon black with a sulphur content of less than 0.3% and preferably less than 0.1%, starting from at least one feed which is the slurry cut obtained from a catalytic cracking unit (FCC or RFCC), the process involving the following steps:

• a step (FILT) for filtering fine solid particles contained in the slurry cut, resulting in a clarified slurry cut, i.e. containing less than 300 ppm and preferably less than 100 ppm of fine particles (less than 10 microns);
• a step (RDS) for hydrotreatment of the clarified slurry cut, operating under the following conditions:
• a) a pressure in the range 50 to 200 bars, and preferably in the range 80 to 120 bar;
• b) a temperature in the range 300° C. to 420° C., preferably in the range 340° C. to 390° C.;
• c) an HSV in the range 0.1 to 2.5 h−1, preferably in the range 0.4 to 1.0 h−1;
• the catalyst used being a succession of at least two distinct hydrotreatment catalysts, and said hydrotreatment step producing an effluent with a BMCI value of more than 110;
• a step (DIST) for distillation of the effluent from the hydrotreatment step, resulting in a “light” portion used as a cut in the fuel pool, and a distillation residue with a sulphur content of less than 0.3% and preferably <0.1%, and having a BMCI of more than 80, preferably more than 100, and with a density of more than 0.97 g·cm−3, preferably more than 1.0 g·cm−3, said distillation residue being introduced into the carbon black unit (CBU),
• a step (CBU) for producing carbon black in the unit, which results in a final product with a specifications in accordance with the ASTM standard (grade 110 to 990).