| 摘要 |
The solution to be concentrated is subjected to three consecutive evaporations 1, 2, 3; the second evaporation 2 and the third evaporation 3 are carried out at atmospheric pressure in evaporators heated respectively with pressurised steam 17 and with molten salts 15, and the steam 13, 12 which is generated therein is used for heating the evaporator for the first evaporation 1. The invention applies to the concentration of aqueous sodium hydroxide solution. <IMAGE>
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