Back to results
US 4,047,896 AGranted
Carbon black pellet treatment
AssigneePhillips Petroleum Company
InventorJohn W. Vanderveen
Life of this patent
Estimating the term…
Abstract
By freezing wet carbon black pellets, clusters of such pellets can be easily broken apart and the frozen pellets can be submitted to a strong screening action without undue production of carbon black fines which would cause a reduction in process efficiency.
Claims8
A process for producing carbon black pellets of uniform pellet size which comprises:
- A. forming wet carbon black pellets by wet-pelleting carbon black with an aqueous pelleting agent,
- B. freezing the resulting wet carbon black pellets so as to form a frozen carbon black pellet material,
- C. breaking apart clumps and clusters of carbon black pellets contained within said frozen carbon black pellet material by subjecting said frozen carbon black pellet material to mechanical action,
- D. sizing the resulting frozen carbon black pellets so as to obtain frozen carbon black pellets of essentially uniform size, and thereafter
- E. drying the resulting sized carbon black pellets so as to form as a product of the process dry carbon black pellets of essentially uniform pellet size.
2 more elements
Dependencies are inferred from the claim text.