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1. (WO2007018203) METHOD FOR PRODUCING HIGH PURITY CAUSTIC POTASH
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/2007/018203    International Application No.:    PCT/JP2006/315638
Publication Date: 15.02.2007 International Filing Date: 08.08.2006
IPC:
C01D 1/30 (2006.01), B01D 9/02 (2006.01)
Applicants: TOAGOSEI CO., LTD. [JP/JP]; 1-14-1, Nishi-Shimbashi Minato-ku, Tokyo 1058419 (JP) (For All Designated States Except US).
OSAKABE, Tsugiyoshi [JP/JP]; (JP) (For US Only).
IMAYOSHI, Sei [JP/JP]; (JP) (For US Only).
HAMAMORI, Mitsuharu [JP/JP]; (JP) (For US Only)
Inventors: OSAKABE, Tsugiyoshi; (JP).
IMAYOSHI, Sei; (JP).
HAMAMORI, Mitsuharu; (JP)
Priority Data:
2005-233666 11.08.2005 JP
Title (EN) METHOD FOR PRODUCING HIGH PURITY CAUSTIC POTASH
(FR) PROCÉDÉ DE PRODUCTION DE POTASSE CAUSTIQUE DE GRANDE PURETÉ
(JA) 高純度苛性カリの製造方法
Abstract: front page image
(EN)Disclosed is a method for producing a high-purity caustic potash with a comparatively simple process, which satisfies recent demands for caustic potash of higher purity. Specifically disclosed is a method for producing a high-purity caustic potash wherein an aqueous caustic potash solution containing not more than 200 mg/kg of sodium and 15 mg/kg of chlorine in terms of potassium chloride when the caustic potash concentration is 48% is kept at a high temperature, thereby obtaining a high-purity caustic potash hardly containing impurities such as sodium, chlorine, and heavy metals such as iron, chromium and nickel by crystallization.
(FR)La présente invention concerne un procédé de production d’une potasse caustique de grande pureté à l’aide d’un processus comparativement simple, qui satisfait les demandes récentes de potasse caustique de plus grande pureté. La présente invention concerne plus spécifiquement un procédé de production d’une potasse caustique de grande pureté, selon lequel une solution aqueuse de potasse caustique ne contenant pas plus de 200 mg/kg de sodium et 15 mg/kg de chlore sous la forme de chlorure de potassium lorsque la concentration en potasse caustique est de 48 % est maintenue à une température élevée, donnant de ce fait par cristallisation une potasse caustique de grande pureté contenant très peu d’impuretés telles que le sodium, le chlore, et des métaux lourds tels que le fer, le chrome et le nickel.
(JA) 本発明の課題は、上記の様な苛性カリの高純度化要求に対し、比較的簡便な方法で高純度苛性カリを得ることができる製造方法を提供することである。  苛性カリ濃度48%を基準として、ナトリウム含有量が200mg/kg以下でそして塩素含有量が塩化カリウム換算で15mg/kg以下を含有する苛性カリ水溶液を高温状態にし、晶析によりナトリウム、塩素、並びに鉄、クロムおよびニッケル等の重金属等の不純物をほとんど含まない高純度苛性カリを得る方法である。
Designated States: AE, AG, AL, AM, AT, AU, AZ, BA, BB, BG, BR, BW, BY, BZ, CA, CH, CN, CO, CR, CU, CZ, DE, DK, DM, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, HN, HR, HU, ID, IL, IN, IS, JP, KE, KG, KM, KN, KP, KR, KZ, LA, LC, LK, LR, LS, LT, LU, LV, LY, MA, MD, MG, MK, MN, MW, MX, MZ, NA, NG, NI, NO, NZ, OM, PG, PH, PL, PT, RO, RS, RU, SC, SD, SE, SG, SK, SL, SM, SY, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW.
African Regional Intellectual Property Organization (BW, GH, GM, KE, LS, MW, MZ, NA, SD, SL, SZ, TZ, UG, ZM, ZW)
Eurasian Patent Organization (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM)
European Patent Office (AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HU, IE, IS, IT, LT, LU, LV, MC, NL, PL, PT, RO, SE, SI, SK, TR)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, ML, MR, NE, SN, TD, TG).
Publication Language: Japanese (JA)
Filing Language: Japanese (JA)