The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 18, 2011
Filed:
Feb. 13, 2006
Gerrald Bargeman, Wageningen, NL;
René Lodewijk Maria Demmer, Enter, NL;
Antoon Ten Kate, Arnhem, NL;
Boris Kuzmanovic, Essen, DE;
Cornelis Elizabeth Johannus Van Lare, Wijchen, NL;
Mateo Jozef Jacques Mayer, Amersfoort, NL;
Maarten André Irène Schutyser, Wageningen, NL;
Jan Barend Westerink, Lochem, NL;
Gerrald Bargeman, Wageningen, NL;
René Lodewijk Maria Demmer, Enter, NL;
Antoon Ten Kate, Arnhem, NL;
Boris Kuzmanovic, Essen, DE;
Cornelis Elizabeth Johannus Van Lare, Wijchen, NL;
Mateo Jozef Jacques Mayer, Amersfoort, NL;
Maarten André Irène Schutyser, Wageningen, NL;
Jan Barend Westerink, Lochem, NL;
Akzo Nobel N.V., Arnhem, NL;
Abstract
The present invention relates to process to prepare a chlorine-containing compound using an aqueous salt solution containing at least 100 g/l of sodium chloride and a contaminating amount of polyvalent cations comprising the steps of (i) preparing an aqueous salt solution containing at least 100 g/l of sodium chloride and at least 0.01 ppm of polyvalent cations by dissolving a sodium chloride source in water, (ii) adding an effective amount of at least one positive retention enhancing component to the aqueous solution, (iii) subsequently subjecting the solution to a nanofiltration step, thereby separating the solution into a retentate which is enriched for polyvalent cations and a permeate which is the purified aqueous salt solution, (iv) reacting the chloride anions in the permeate to a chlorine-containing compound by an electrolysis step, and (v) recycling at least part of the retentate to dissolution step (i).