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US 4,289,742 AGranted
Carbon black recovery
AssigneePhillips Petroleum Company
InventorPaul H. Johnson
Life of this patent
Estimating the term…
Abstract
A process and apparatus for recovering carbon black from hot smoke which comprises passing the smoke through a cyclone separation zone following cooling, then through aggregate filter beds and regeneration of filter beds with clean off-gas which is recycled through the carbon black reaction zone as quench.
Claims5
A process for filtering solids from carbon black smoke produced in a carbon black furnace by the pyrolysis of hydrocarbon oil under conditions forming a hot smoke having a temperature above 2200.degree. F. which comprises:
- (a) quenching said hot smoke removed from said furnace to a temperature of about 2000.degree. F. or below by injecting into it recycle smoke subsequently to be described;
- (b) cooling said hot smoke further by indirect heat exchange to a temperature of about 700.degree. F. or lower;
- (c) passing said hot smoke, cooled in (b), to a cyclone separation zone to remove a substantial portion of the carbon black solids present as product for further processing as desired;
- (d) removing carbon black smoke substantially reduced in solids content from said cyclone separation zone and then passing same through a filtration zone on filtering cycle containing a bed of aggregate filtering medium to further remove solids therefrom;
- (e) withdrawing off-gas substantially free of carbon black solids from (d);
- (f) passing at least a portion of said off-gas in (e) to a filtration zone on regeneration cycle containing aggregate filtering medium and carbon black solids under conditions to substantially remove said carbon black solids;
- and
- (g) recycling said off-gas containing carbon black solids removed in (f) to (a) as quench to reduce the temperature of said hot smoke.
5 more elements
Dependencies are inferred from the claim text.