Patent GB-1309962-A (GB)
Title: Apparatus and process for producing carbon black
IPC: C09C1/50
Filed: 1971-03-26
Abstract: 1309962 Carbon black CONTINENTAL CARBON CO 26 March 1971 7956/71 Heading C1A A carbon furnace comprises (a) an elongate cylindrical housing 10 having a first section 20 at the downstream end and a second section 48 at the upstream end, which sections are coaxially aligned to communicate substantially horizontally; (b) a refractory lining 24 having a uniform diameter positioned within the said first section of the housing, (c) at least three ports 30 arranged around the periphery of the housing and extending through the housing and lining at points between the ends of said first housing section, these ports having axes set at an angle in the range of 15‹ to 75‹ from the axis of the reactor so that they intersect at the same point downstream on the axis of the reactor; (d) tunnel burner means 32 communicating with each of said ports; (e) an input port 52 extending through the housing of said second section, and a conduit 54 communicating with said port; (f) a centrally apertured end plate 58 closing the end of said second section; (g) an annular cylindrical baffle 72 coaxially mounted within said second section having an internal diameter substantially equal to that of the interior of the lining of the first section and extending axially from the downstream end of the second section into a spaced relation with the said end plate thereby establishing an annular zone 76 between the housing of the second section and the baffle; (h) a centrally apertured diffusion plate 62 coaxially mounted between the first and second sections, which plate has a series of perforations 66 distributed around said aperture 64 and (i) a burner assembly and feedstock injection means 78 axially mounted through the central apertures in the end and diffusion plates so as to be directed into the reactor. The preferred angle for the focused ports is 50 degrees, and four ports may be spaced equidistantly about the housing and lining of the first section. The axial length of the second section may be less than its diameter. The input port in the second section may extend radially with respect to the axis of the section. Carbon black may be prepared in this reactor by introducing fuel into a combustion zone of a reactor; radially introducing free oxygen containing gas into the annular zone surrounding a hollow cylindrical baffle arranged coaxially in the reactor, the gas then passing through the baffle and then through the perforations in a diffuser plate to give a longitudinal gas flow in the direction of the furnace axis; passing the gas into the combustion zone of the reactor where it is mixed with fuel, burning the mixture and passing it into the zone of the reactor into which there is axially introduced the h.c. feedstock, additional fuel and excess amount of O 2  containing gas being introduced into the tunnel burners and the products of their combustion introduced into part of the reaction zone through the focused ports, in which part the effluent from the upstream end of the reaction zone is introduced, passing the products from the reaction zone, quenching and recovering the black produced.