Process and system for producing sodium hydrosulfite crystals
AssigneeHydro Technologies (Canada) Inc.
InventorPatrice DOUVILLE
Life of this patent
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Abstract
A process and a system allow producing sodium hydrosulfite crystals. A suspension containing sodium hydrosulfite is provided. The sodium hydrosulfite crystals are separated from a remainder of the suspension. The separated sodium hydrosulfite crystals are cooled to a stable temperature. The suspension may be obtained by raising a pH and lowering a temperature of a solution containing sodium hydrosulfite. A partial precipitation of the sodium hydrosulfite to form the crystals may be facilitated by addition of a nucleating agent to the suspension.
Claims43
A process for producing sodium hydrosulfite crystals, comprising:
- providing a first water-based suspension containing sodium hydrosulfite in a first concentration;
- separating at least a portion of the sodium hydrosulfite crystals from a remainder of the first water-based suspension to form a second water-based suspension containing the separated sodium hydrosulfite crystals, the second water-based suspension having a second sodium hydrosulfite concentration greater than the first concentration;
- and
- cooling the second water-based suspension containing the separated sodium hydrosulfite crystals to a stable temperature.
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A system for producing sodium hydrosulfite crystals, comprising:
- a storage adapted to provide a first water-based suspension containing sodium hydrosulfite in a first concentration;
- a separator adapted to receive the first water-based suspension from the storage and to separate at least a portion of the sodium hydrosulfite crystals from a remainder of the first water-based suspension to form a second water-based suspension containing the separated sodium hydrosulfite crystals, the second water-based suspension having a second sodium hydrosulfite concentration greater than the first concentration;
- and
- a chiller adapted to receive the second water-based suspension containing the separated sodium hydrosulfite crystals from the separator and to cool the second water-based suspension containing the separated sodium hydrosulfite crystals to a stable temperature.
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Dependencies are inferred from the claim text.