US3831747A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluidized bed processing of carbon black
Assignee: JM Huber Corp
•
Filing: 1972-06-02
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Granted: 1974-08-27
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Expires: 1992-06-02
Abstract
Abstract An improved manufacturing technique for simultaneously cooling and separating ''''fines'''' and/or contaminants from granular materials or powders such as carbon black is disclosed. The process includes the use of a fluidized bed to effect the removal of fines and foreign matter, the quenching of exothermic reactions and extinguishing of fires as they may exist and the continuous cooling of hot granular materials such as pelletized carbon black. Due to the high rate of heat transfer in the fluidized bed, very rapid cooling of the material is accomplished and in a manner such that, for example, cooled carbon black shows no tendency to spontaneously generate heat or to burn or begin or continue rapid oxidation while in bulk storage and/or transporting facilities. Through proper instrumentation of the fluidized bed, the presence of exothermic reactions, such as fires in the dryer as well as the presence of indothermic reactions, such as the presence of ''''wet'''' black can be simply and easily detected.
Inventors
- 👤 O Scott
- 👤 B Setliff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:30
CPC Classifications
B; B03; B03B; B03B4/00; B03B4/06; B03B1/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
156 words
A method for cooling and separating fines and contaminants from hot pelletized particulates of carbon black, said method comprising the steps of introducing hot, dried pelletized particulates of carbon black into an unobstructed cooling zone divided from an air distribution zone by a perforated distributor plate, and countercurrently to cooling air at ambient temperatures; continuously supplying through said distribution plate an upward stream of cooling air for maintaining said hot carbon black as a fluidized bed and to effect cooling of the said hot carbon black to a temperature below 300* F, and in the range of from 100*-150*F below that temperature at which said pellets were introduced into said cooling zone; maintaining the space velocity of said upward stream of the cooling air at a rate so as to air convey and sweep from said fluidized bed, fines of said carbon black below a preselected size; and withdrawing cooled carbon black from said fluidized bed.
Claim 2
Independent Claim
156 words
A method for cooling and separating fines and contaminants from hot pelletized particulates of carbon black, said method comprising the steps of introducing hot, dried pelletized particulates of carbon black into an unobstructed cooling zone divided from an air distribution zone by a perforated distributor plate, and countercurrently to cooling air at ambient temperatures; continuously supplying through said distribution plate an upward stream of cooling air for maintaining said hot carbon black as a fluidized bed and to effect cooling of the said hot carbon black to a temperature below 300* F, and in the range of from 100*-150*F below that temperature at which said pellets were introduced into said cooling zone; maintaining the space velocity of said upward stream of the cooling air at a rate so as to air convey and sweep from said fluidized bed, fines of said carbon black below a preselected size; and withdrawing cooled carbon black from said fluidized bed.
Claim 3
Dependent Claim
70 words
The method in accordance with claim 1 wherein said cooling air is introduced into said bed at a temperature less than about 85* F and said cooled carbon black pellets are withdrawn at a temperature of less than 250* F, said method further comprising withdrawing and collecting the fines swept from said fluidized bed and returning said fines to a point upstream of said cooling zone for further processing thereof.
Claim 4
Dependent Claim
34 words
The method in accordance with claim 1 and further comprising collecting said contaminants, including ferrous and non-ferrous foreign matter, in the lower portion of said cooling zone and withdrawing said contaminants from said zone.
Claim 5
Dependent Claim
36 words
The method in accordance with claim 1 wherein said hot carbon black is introduced into said zone at an upper level thereof and at a point remote from that at which said cooled black is withdrawn.
Claim 6
Dependent Claim
58 words
The method in accordance with claim 1, said method further comprising measuring the inlet temperature of said cooling gas and the temperature of the fluidized bed of pelletized carbon black or freeboard gas above the upper level of said bed to thereby determine the moisture content of the hot pelletized carbon black being introduced into said cooling zone.
Claim 7
Dependent Claim
51 words
The method in accordance with claim 5 wherein said tempErature measurement of said fluidized bed of pelletized carbon black or said gas above the upper level of said bed, is in operative association with an alarm that is caused to be actuated when said temperature difference is below a preselected level.
Claim 8
Dependent Claim
39 words
The method in accordance with claim 1, said method further comprising measuring the inlet temperature of said hot pelletized carbon black and the outlet or bed temperature of said granular material to thereby determine the presence of exothermic reactions.
Claim 9
Dependent Claim
42 words
The method in accordance with claim 7 wherein said temperature measurements produce a difference signal which in operative association with an alarm set circuit causes an indicator or control circuit to be actuated when said temperature difference is above a preselected level.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-26 | 1978-02-25 | 1978-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-26 | 1982-02-25 | 1982-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-26 | 1986-02-25 | 1986-08-27 | $7700.00 | Window Closed / Lapsed |