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US 4,397,100 AGranted
Organic solid substrate dewatering process based on plug flow contact by an extractive fluid
AssigneeInterNorth, Inc.
InventorsLeland C. Dickey, Maya Tayter
Life of this patent
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Abstract
A method of removing water from organic solid substrates, such as peat, wherein a primary solvent is used to extract water from the substrate and the primary solvent and the substrate are kept in plug flow during contact, and then a secondary solvent may be used to separate the primary solvent from the water.
Claims17
A method of removing water from an organic solid substrate which comprises:
- (a) contacting the substrate with a solvent such that the substrate and the solvent remain in plug flow during contact to remove at least a large portion of the water therefrom in relatively pure form, and
- (b) separating the substrate from the mixture of solvent and water.
A method of removing water from organic solid substrates which comprises:
- (a) contacting the substrate with a primary solvent such that both the substrate and the primary solvent are kept in plug flow during contact to remove at least a large portion of the water therefrom in relatively pure form,
- (b) separating the substrate from the mixture of primary solvent and water,
- (c) contacting the mixture with a secondary solvent which is miscible with the primary solvent but not with water to separate the primary solvent from the water,
- (d) separating the water from the mixture of primary solvent and secondary solvent, and
- (e) separating the primary and secondary solvents.
2 more elements
In a method of removing water from organic solid substrates which comrises:
- (a) contacting the substrate with a primary solvent to remove at least a large portion of the water therefrom,
- (b) separating the substrate from the mixture of primary solvent and water,
- (c) contacting the mixture with a secondary solvent which is miscible with the primary solvent but not with water to separate the primary solvent from the water,
- (d) separating the water from the mixture of primary solvent and secondary solvent, and
- (e) separating the primary and secondary solvents, the improvement which comprises keeping the substrate and the primary solvent in plug flow during contact in step (a) so that the water removed from the substrate is in relatively pure form.
2 more elements
Dependencies are inferred from the claim text.