Measures to concentrate 4% salt acid to 8%
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The currently produced 4% salt acid needs to be concentrated to over 8% for reuse. Can it be achieved through evaporation or distillation? Water is removed from the top of the tower by evaporation or distillation; the bottom of the tower contains 8% salt acid. Will the water obtained at the top of the tower contain HCL? What other economic measures can be implemented? Please give me some advice.
1: Negative pressure distillation should work, but it causes significant equipment corrosion. 2: Steam must contain acid. 3 ； Salt and acid can be added to increase the concentration to 8%.
1. Multi-stage cyclic absorption is employed in the by-product salt acid generation stage to increase its concentration. 2. If the acidity level of the by-product salt is not high, it can be used in the preparation of concentrated salt acid, which is what was mentioned in point 3 above.
It’s not cost-effective; 30% hydrochloric acid costs only 200 yuan per ton, so it’s better to buy concentrated hydrochloric acid and mix it yourself