EP 2509919 A1 20121017 - USING THE SOLID WASTE-QUICKLIME MEMBRANE SWQM PROCESS FOR THE PRODUCTION OF SODIUM HYDROXIDE
Title (en)
USING THE SOLID WASTE-QUICKLIME MEMBRANE SWQM PROCESS FOR THE PRODUCTION OF SODIUM HYDROXIDE
Title (de)
VERWENDUNG DES FESTSTOFFABFALL-BRANNTKALKMEMBRANVERFAHRENS (SWGM) FÜR DIE HERSTELLUNG VON NATRIUMHYDROXID
Title (fr)
UTILISATION DU PROCÉDÉ MEMBRANAIRE DÉCHETS SOLIDES-CHAUX VIVE (SWQM) POUR OBTENTION D'HYDROXYDE DE SODIUM
Publication
Application
Priority
IB 2009007713 W 20091209
Abstract (en)
[origin: WO2011070384A1] The proposed invention uses ion exchange technology to produce dilute caustic soda liquor from calcium hydroxide liquor Ca(OH)2 followed by the reaction of carbon dioxide CO2 with caustic soda to produce dilute sodium carbonate solution. Multiple reverse osmosis and acidic CO2 sparging can concentrate the Na2CO3 liquor to 6-7%. The 6-7% liquor is treated with waste heat to produce 50% or solid Na2CO3. The 6-7% liquor can be treated with Ca(OH)2 to produce 6-7% NaOH liquor then can be transformed to 50% or solid NaOH. The output of many industrial processes generates waste heat, brine water and CO2 and the present invention combines these components in the production of solid Na2CO3, NaOH or their high % liquors. Availability of waste heat sources can lead to higher efficiency in Na2CO3 and NaOH production. The process is not electrochemical chloro alkali technology or Solvay process.
IPC 8 full level
C01D 1/04 (2006.01); C01D 1/22 (2006.01); C01D 7/00 (2006.01); C02F 1/44 (2006.01)
CPC (source: EP KR US)
C01D 1/04 (2013.01 - KR); C01D 1/22 (2013.01 - EP KR US); C01D 7/00 (2013.01 - KR); C01D 7/07 (2013.01 - EP US); C02F 1/44 (2013.01 - KR); C22B 26/10 (2013.01 - US); C02F 1/42 (2013.01 - EP US); C02F 1/441 (2013.01 - EP US); Y02P 20/129 (2015.11 - EP US)
Citation (search report)
See references of WO 2011070384A1
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR
DOCDB simple family (publication)
WO 2011070384 A1 20110616; AP 2012006365 A0 20120831; AU 2009356416 A1 20120726; AU 2009356416 B2 20141120; EP 2509919 A1 20121017; KR 20120105504 A 20120925; RU 2012128544 A 20140120; RU 2538843 C2 20150110; US 2013272934 A1 20131017
DOCDB simple family (application)
IB 2009007713 W 20091209; AP 2012006365 A 20091209; AU 2009356416 A 20091209; EP 09852000 A 20091209; KR 20127017802 A 20091209; RU 2012128544 A 20091209; US 200913521127 A 20091209