Patent AU-2010101488-A4 (AU)
Title: Methods for cleaning a porous polymeric membrane and a kit for cleaning a porous polymeric membrane
Inventor: ZAUNER PETER
IPC: B01D65/02
Filed: 2010-06-08
Granted: 2012-03-15
Abstract: (12) INTERNATIONAL APPLICATION PUBLISHED UNDER THE PATENT COOPERATION TREATY (PCT) (19) World Intellectual Property Organization IN International Bureau (10) International Publication Number (43) International Publication Date 16 December 2010 (16.12.2010) PCT W O 2010/142673 Al (51) International Patent Classification: CA, CH, CL, CN, CO, CR, CU, CZ, DE, DK, DM, DO, BO1D 65/02 (2006.01) DZ, EC, EE, EG, ES, Fl, GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IS, JP, KE, KG, KM, KN, KP, (21) International Application Number: KR, KZ, LA, LC, LK, LR, LS, LT, LU, LY, MA, MD, PCT/EP2010/057998 ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, (22) International Filing Date: NO, NZ, OM, PE, PG, PH, PL, PT, RO, RS, RU, SC, SD, 8 June 2010 (08.06.2010) SE, SG, SK, SL, SM, ST, SV, SY, TH, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW. (25) Filing Language: English (84) Designated States (unless otherwise indicated, for every (26) Publication Language: English kind of regional protection available): ARIPO (BW, GH, (30) Priority Data: GM, KE, LR, LS, MW, MZ, NA, SD, SL, SZ, TZ, UG, 2009902681 11 June 2009 (11.06.2009) AU ZM, ZW), Eurasian (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM), European (AL, AT, BE, BG, CH, CY, CZ, DE, DK, (71) Applicant (for all designated States except US): Siemens EE, ES, Fl, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, Water Technologies Corp. [US/US]; 181 Thorn Hill LV, MC, MK, MT, NL, NO, PL, PT, RO, SE, SI, SK, Road, Warrendale, Pennsylvania 15086 (US). SM, TR), OAPI (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, (72) Inventors; and GW, ML, MR, NE, SN, TD, TG). (75) Inventors/Applicants (for US only): ZAUNER, Peter Declarations under Rule 4.17: [AT/AU]; 27 Clifton Avenue, Faulconbridge, New South - ofinventorship (Rule 4.17(iv)) Wales 2776 (AU). ZHA, Fufang [AU/AU]; 15A Grand Avenue, West Ryde, New South Wales 2114 (AU). Published: (74) Agents: FRENCH, Clive Harry et al.; Siemens AG, - with international search report (Art. 21(3)) Postfach 22 16 34, 80506 Munich (DE). - before the expiration of the time limit for amending the (81) Designated States (unless otherwise indicated, for every claims and to be republished in the event of receipt of kind of national protection available): AE, AG, AL, AM, amendments (Rule 48.2(h)) AO, AT, AU, AZ, BA, BB, BG, BH, BR, BW, BY, BZ, (54) Title: METHODS FOR CLEANING A POROUS POLYMERIC MEMBRANE AND A KIT FOR CLEANING A POROUS POLYMERIC MEMBRANE FIG 1 Lab. Cleaning Studies on PVDF Fibres Comparison of Standard and Improved CIP Protocols 00 Pre-Clean El After 2 hours Chlorine goal- 0 After 2 % Citric [l After Dechlorination with NaHS03 then 0.5 % Citric 800 - E After Dechlorination with NaHS03 then 0.1 % Citric 0 After 2 hrs Dechlorination with NaHSO3 500- ----- - -- ---- 400 ---- ----- -- -- -- ------- - --------- --- - ---- 3 00 - - - - - -- --- -- ---- -- 200- - - -- -- - - ---- - --- - - - 1 Test 1 Test 2 Test 3 test 4 Tes11 I Test 2 Tst 1 Test 2 Testi 1 Test 2 1000 ppm Chlorine followed by 2% Citric 1000 ppm Chlorine 1000 ppm Chlorine 1000 ppm Chlorine followed by De chlori- followed by Dechlori- followed by 2 hrs nation with NaHASO3 nation with NaHS03 Dechlorination with then 0.5% Citric then 0.1% Citric NaHSD3 Standard dual CI verorder of chemicals Inventive CIP Inventive DIP Inventive CIP reversed (57) Abstract: A method for cleaning a porous polymeric membrane including the steps of: contacting said membrane with a first cleaning solution including at least one oxidising agent; contacting said membrane and said first cleaning solution with a second cleaning solution including at least one reducing agent wherein said oxidising and reducing agents undergo a neutralisation reac f4 tion to form an oxidation-neutral mixed cleaning solution such that said membrane is simultaneously cleaned during said neutrali sation reaction. A kit is also provided for cleaning a porous polymeric membrane, which includes a first cleaning solution includ ing at least one oxidising agent and a second cleaning solution, including at least one reducing agent and an enhancing agent, as a dosage regime, together with instructions for cleaning the porous polymeric membrane.