Method and device for controlling feeding in bromine process
A technology of feeding control and control device, applied in program control, electrical program control, program control in sequence/logic controller, etc., can solve the problems of low degree of automation and low accuracy, so as to improve the extraction rate and realize accurate Control and improve the effect of working environment
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Embodiment 1
[0038] This example is used to illustrate the theoretical basis for maintaining the Eh value of the oxidation-completed liquid within the range of 880-1100 mV. In this embodiment, the Eh value is determined through a simulation experiment.
[0039] Chlorine gas is introduced into the oxidation tower, and the chemical reaction that occurs is:
[0040]
[0041] HCl+HClO+2NaBr→2NaCl+Br 2 ↑+H 2 O (2)
[0042] Chlorine reacts with water to produce hydrochloric acid and hypochlorous acid (Equation 1), the latter converting Br - The ions are oxidized to generate free bromine (Formula 2), and the free bromine is brought to the absorption tower by the blown air in the blow-out tower.
[0043] From the perspective of reaction equilibrium constant, chlorine should be moderately excessive to ensure that formula (2) can be carried out more thoroughly. If too much chlorine is present in excess, the following reactions may occur:
[0044] NaBr+3HClO=NaBrO 3 +3HCl (4)
[0045] If b...
Embodiment 2
[0051] This example is used to illustrate the theoretical basis for maintaining the Eh value in the blowing tower drainage within the range of 340-560mV. In this embodiment, the Eh value is determined through a simulation experiment.
[0052] In the absorption process of the air blowing method, SO is first added to the eluent 2 (generated by burning sulfur), generating sulfurous acid, free bromine is reduced to bromide ion by sulfurous acid, and absorbed by eluent, the reaction formula is:
[0053] SO 2 +H 2 O=H 2 SO 3 (5)
[0054] Br 2 +H 2 SO 3 +H 2 O=2HBr+H 2 SO 4 (6)
[0055] If the absorption process has not been completed, SO 2 Will be absorbed in the eluent, if the free bromine has not been completely reduced, SO 2 will escape and enter the subsequent absorption liquid. For example, after passing through the trapping tower and returning to the blowing tower, the SO 2 It will enter the drain of the blow-out tower. In the actual production process, it i...
Embodiment 3
[0059] In this example, simulation experiments will be used to demonstrate the influence of the pH value of the oxidation-completed liquid before purging on the stripping rate, so as to illustrate the theoretical basis for maintaining the pH value of the oxidation-completed liquid at 2.5-4. At the same time, in this embodiment, two kinds of purge gases are set as a comparison, which are CO and N respectively. 2 .
[0060] 1. Solution configuration
[0061] Solution 1 (100mL): 10% NaCl, 0.5gNaBr (concentration at this time is 5000mg / L)
[0062] Solution 2: hypochlorous acid solution (containing 0.05% hypochlorous acid)
[0063] 2. Experimental steps
[0064] 2.1) Configure 100mL solution 1, adjust its pH value to 2 with concentrated hydrochloric acid and 1M NaOH solution, and simultaneously adjust the pH value of solution 2 to 2 with concentrated hydrochloric acid and 1M NaOH solution;
[0065] 2.2) Add dropwise solution 2 with the same pH value to solution 1, measure the E...
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