FIELD: chemistry.
SUBSTANCE: mixture of concentrated sulphuric acid solution and first sulphuric acid solution is pumped with circulation pump (3) through pipeline (4) to heaters (2). Before entering heaters (2) pipeline system (4) is filled with mixture of hydrogen peroxide and the second solution of sulphuric acid with concentration of 90%. Obtained mixture is concentrated in evaporator (1) to get concentrated sulphuric acid solution. Evaporated water is removed from evaporator (1) and pipeline systems (4).
EFFECT: invention allows to create operating conditions, which do not lead to enamel destruction.
7 cl, 4 dwg
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