Particulating materials
OwnerE. Webb Hendersoninventor
Life of this patent
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Abstract
An apparatus for drying pellets of particulate material such as carbon black is characterized by a columnar drying vessel containing inclined trays or screens positioned so that the pellets or particulates roll from screen to screen down the column. Preferably, the pellets are subjected to countercurrent flow of drying gases while flowing down the screens. In other aspects, carbon black is pelleted with a nonaqueous liquid pelleting fluid and dried with vapors of the same pelleting fluid.
Claims18
A process comprising
- (a) pelleting carbon black with a liquid pelleting fluid to form wet pellets of carbon black and pelleting fluid;
- and
- (b) drying the wet pellets with hot vapors of said pelleting fluid from an extraneous source;
- wherein said pelleting fluid is characterized by a heat of vaporization of less than 25,000 BTU/FT.sup.3 and a normal boiling point in the range of -50.degree. F. to 300.degree. F.
A process comprising introducing wet pellets of carbon black wetted with a liquid pelleting fluid into the upper end of a drying vessel;
- rolling the pellets to the lower end of the drying vessel;
- introducing hot vapors of the pelleting fluid into the lower end of the drying vessel;
- flowing the hot vapors to the upper end of the drying vessel in intimate countercurrent contact with the wet pellets;
- and
- removing dry pellets from the lower end of the drying vessel;
- wherein the pelleting fluid is characterized by a heat of vaporization of less than 25,000 BTU/FT.sup.3 and a normal boiling point in the range of -50.degree. F. to 300.degree. F.
A process comprising
- (a) spraying a slurry of carbon black in liquid pelleting fluid into an upper portion of a drying vessel;
- (b) introducing a stream of carbon black pellets into the upper portion drying vessel so that the slurry deposits on the pellets;
- (c) flowing the pellets to a lower portion of the drying vessel;
- (d) withdrawing the pellets from the power portion of the vessel;
- (e) introducing a heated stream of pelleting fluid vapor into a lower portion of the vessel for countercurrent flow with respect to the pellets;
- and
- (f) withdrawing a stream of pelleting fluid vapor from an upper portion of the drying vessel.
A process comprising
- (a) introducing a slurry of carbon black and liquid pelleting fluid into a concentration vessel;
- (b) concentrating the slurry by subjecting same to intimate countercurrent contact with hot vapors of pelleting fluid to form a concentrated slurry;
- (c) withdrawing the concentrated slurry from the concentrating vessel;
- (d) introducing the concentrated slurry into an upper end of a drying vessel;
- (e) forming the slurry into droplets;
- (f) flowing hot vapors of the pelleting fluid in intimate countercurrent contact with the droplets of the slurry to transform the droplets into pellets;
- and
- (g) collecting the pellets of carbon black thus produced.
Dependencies are inferred from the claim text.