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Product Characteristics

PCH-1110-0009 The enclosed table and diagram give an indication about the solubility of sodium carbonate in liquid caustic soda. The solubility of sodium carbonate in liquid caustic soda is not only influenced by the temperature and the concentration of sodium hydroxide but also by the formation of different crystals i.e. sodium hydroxide, sodium hydrogen carbonate and sodium carbonate crystals.

NaOH – Na2CO3 - H2O System (double points ) Temperature, °C 0 15 20 25 30 32 0 15 20 25 30 35 35,37 15 20 25 30 35 45 60 70 80 90 107,5 g NaOH / kg 223 170 134 93 35 0 240 194 162 127 79 6 0 470 450 433 415 400 380 340 303 255 195 0 g Na2CO3 / kg 31 89 124 180 267 315 37 79 111 154 219 320 332 0,3 0,6 0,9 1,3 1,9 3,5 7 14 36 69 305
References : - ICI – R.58/17/50, R.45/21/19, Y.58/38/1 - Phil. Trans., 1922, vol. A. 223, p.35 - J. Am. Chem. Soc., 1932 vol. 54, p. 928, 1936, vol. 58, p. 843

Solid Phase

Na2CO3.10H2O + Na2CO3.7H2O

Na2CO3.7H2O + Na2CO3.H2O

Na2CO3.H2O + Na2CO3

Solvay Chemicals International SA Rue de Ransbeek 310 B - 1120 Brussels Brussels, RPM 0406804736 +32 2 264 21 11 PCH-1110-0009-W-EN (WW) Issue 1 - June 2007




Product Characteristics

NaOH – Na2CO3 - H2O System
C: Concentration, g NaOH/kg 16

C = 300 14


(Approximative) Solubility, g Na2CO3 / kg

C = 350 10





C = 400 4 C = 450 C = 500 2

0 0 20 40 Temperature, °C 60 80 100

__________________________________________________________________________________________________________ To our present knowledge, the information contained herein is accurate as of the date of this document. However, we do not make any warranty, express or implied, or accept any liability in connection with this information or its use. This information is for use by technically skilled persons at their own discretion and risk and does not relate to the use of this product in combination with any other substance or any other process. This is not a license under any patent or other proprietary right. The user alone must finally determine suitability of any information or material for any contemplated use, the manner of use in compliance with relevant legislations and whether any patents are infringed. We reserve our right to make additions, deletions, or modifications to the information at any time without prior notification.

Solvay Chemicals International SA Rue de Ransbeek 310 B - 1120 Brussels Brussels, RPM 0406804736 +32 2 264 21 11 PCH-1110-0009-W-EN (WW) Issue 1 - June 2007




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