METHOD AND APPARATUS FOR PREPARING HIGH-CONCENTRATION ALKALI

摘要

Alkali is concentrated to high density by evaporation under high pressure at elevated temperature and expansion of the concentrated solution to low pressure, preferably below the atmospheric pressure, wherein the pressure difference between the high-pressure vessel (2) and the low-pressure vessel (25) is absorbed gradually by an absorbing means, preferably a liquid column (H) of a U-shaped siphon (26), so that wear and erosion are reduced considerably.