Process for purification of organic sulfonates and novel product
AssigneeGEO Specialty Chemicals, Inc.
InventorsWilliam G. Kozak, Daniel J. Riley
Life of this patent
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Abstract
A process for producing a low sulfate organic sulfonate/sulfate aqueous solution from a soluble sulfate containing organic sulfonate/sulfate which comprises forming an aqueous solution of organic sulfonate/sulfate; and passing the aqueous solution of the organic sulfonate/sulfate containing the soluble sulfate over a nanofiltration zone at an elevated pressure to form a retentate with a reduced sulfate content and a permeate containing the soluble sulfate and organic material.
Claims17
A process for producing a low sulfate organic sulfonate/sulfate aqueous solution from a soluble sulfate containing sulfonate/sulfate which comprises:
- forming an aqueous solution of organic sulfonate/sulfate;
- and
- passing the aqueous solution of the organic sulfonate/sulfate containing the soluble sulfate over a nanofiltration zone at an elevated pressure to form a retenate with a reduced sulfate content and a permeate containing the soluble sulfate and organic material, said nanofiltration zone comprising a membrane that has been prepared by contacting the membrane with a solution of dilute nitric acid and subsequently contacting the membrane with an alkaline solution of a chelating agent.
A method for improving the permeability of a nanofiltration membrane for soluble salts in an aqueous solution of organic sulfonate/sulfate which comprises:
- contacting the nanofiltration membrane with a dilute nitric acid solution and with an alkaline solution of a chelating agent.
Dependencies are inferred from the claim text.