Recovery of sodium thiocyanate from industrial process solution using nanofiltration technique
AssigneeCouncil of Scientific and Industrial Research
InventorsSundergopal Sridhar, Suryanarayana Murthy Gorugantu, Suhanya Duraiswamy, Smitha Biduru, Ramakrishna Machiraju
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Abstract
The present invention relates to a membrane-based nanofiltration process for separating sodium thiocyanate (NaSCN) from industrial solution containing impurities such as β-sulfopropionic acid, β-sulfopropionitrile, sodium sulfate and salts of iron and calcium in a single step to obtain a colorless aqueous solution for spinning of acrylic fiber in textile industry.
Claims11
A process for recovery of sodium thiocyanate from industrial process solution containing a color imparting ion, al least one component selected from the group consisting of β-sulfo propionic acid and β-sulfo propionitrile, and optionally at least one member selected from the group consisting of an organic compound, an inorganic compound, and a bivalent salt by membrane based nanofiltration technique, said process comprising the steps of:
- passing the industrial process solution as a feed solution through a nanofiltration membrane with simultaneous application of positive pressure to provide a pass solution and a permeate solution, wherein the permeate solution is substantially devoid of the at least one component and the color imparting ion, and evaporating the permeate solution to obtain sodium thiocyanate.
Dependencies are inferred from the claim text.