A kind of nitric acid decolorization method and device
A decolorization and nitric acid technology, which is applied in the direction of nitric acid, nitrogen oxides/oxyacids, etc., can solve the problems that cannot meet the requirements and standards of downstream products, and achieve the effect of small investment and simple production and operation
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Embodiment 1
[0019] Such as figure 1 As shown, a kind of nitric acid stripping decolorization device provided by the present invention comprises a decolorization tower, the inlet pipe of the decolorization gas and the 68% white nitric acid storage tank (ground tank) are respectively connected to the bottom of the decolorization tower, and the high-level acid is respectively connected to the top of the decolorization tower through pipelines. The tank and the gas-liquid separator, an acid pump is also connected between the top of the decolorization tower and the high-level acid tank, the outlet pipe of the gas-liquid separator is connected to the NOx compressor, and the liquid outlet pipe of the gas-liquid separator is connected to the high-level acid tank.
[0020] Process flow of the present invention is:
[0021] In the elevated acid tank, add 0.75T of 60% dilute nitric acid and 0.25T of 98% concentrated nitric acid to prepare 68.% yellow nitric acid.
[0022] The outlet air of the air c...
Embodiment 2
[0024] Embodiment two utilizes tail gas decolorization, can realize unpowered production:
[0025] Such as figure 2 As shown, in the high-level acid tank, mix 60% acid and 98% concentrated nitric acid in a certain proportion to prepare 68.% yellow nitric acid, which enters the upper part of the decolorization tower under the action of potential difference, and controls the flow rate of 8-10m 3 / h.
[0026] The exhaust gas from the outlet of the exhaust gas turbine (or expander) controls the flow (about 2000NM 3 / H), enter the decolorization tower and contact with the 68% acid from the upper part in countercurrent, the bleached 68% white nitric acid enters the 68% white nitric acid tank, and the decolorized tail gas is merged into the system tail gas and emptied together.
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