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A mixture of sulphuric acid and nitric acid was supplied to the columns. These substances were formed as a waste product of the glycerine nitration process that took place in the previous building. In order to separate the two substances from each other, superheated steam was used, the temperature of which reached about 220 degrees C. After this process, the sulphuric acid went to the bottom of the denitration columns, while the nitric acid was redirected to another part of this building.
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