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US 4,049,685 AGranted
Process for cleansing spent clay
AssigneeSylvachem Corporation
InventorsGary W. Smith, Dwight E. Leavens, Louis Ray Sims
Life of this patent
Estimating the term…
Abstract
Process for washing fatty acids from spent clay, such as spent bleaching clay, with aqueous alkali at elevated temperature is improved by establishing and maintaining the mixture of aqueous phase and fatty acid at a pH between about 5 and about 6.5.
Claims6
In a process for cleansing fatty acids from spent crystalline clay wherein said spent clay is slurried and, in at least a primary wash stage, washed with aqueous alkali at elevated temperature for forming a cleansed clay sediment and recovering fatty acid, the improvement which comprises:
- establishing and maintaining the mixture of aqueous phase and fatty acid in said primary wash stage at a pH between about 5 and about 6.5.
Dependencies are inferred from the claim text.