Method for treating brominated and etherified waste liquid of pyraclostrobin
A technology for the treatment of ester brominated ethers and waste liquids, which is applied in chemical instruments and methods, bromine/hydrogen bromide, bromine, etc., can solve problems such as increased costs, many impurities in the water phase, and limited use of sodium bromide, and achieves Improve utilization rate and reduce waste
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Embodiment 1
[0039] Add 5kg of wastewater containing 6.1% hydrobromic acid in the bromination section to 15kg of etherification wastewater containing 20% sodium bromide.
[0040] Centrifuge to remove the insoluble matter in the mixed wastewater to obtain a light yellow clear liquid with a pH<1.
[0041] Put the clarified liquid into a 50L reaction kettle, then slowly add 2.9 kg of 60% sulfuric acid into the reaction vessel, stir and raise the temperature to 60 degrees Celsius, then slowly add 2.3kg of hydrogen peroxide with a concentration of 27.5% dropwise, heat up to distillation, condense and use 10kg of dichloroethyl alkane solution to collect bromine and bromine vapor from exhaust gas.
[0042] After most of the bromine is evaporated, the temperature is lowered to 60 degrees Celsius, and then 5kg of dichloroethane is pumped in to azeotrope the remaining bromine in the reactor, and the orange red color in the reactor fades. The above bromine-containing dichloroethane solutions were ...
Embodiment 2
[0045] Add 10kg of wastewater containing 8.2% hydrobromic acid in the bromination section to 10kg of etherification wastewater containing 21.4% sodium bromide salt.
[0046] Centrifuge to remove the insoluble matter in the mixed wastewater to obtain a light yellow clear liquid with a pH<1.
[0047]Put the clarified liquid into a 50L reaction kettle, then slowly add 2.0 kg of 60% sulfuric acid into the reaction vessel, stir and heat up to 60 degrees Celsius, then slowly add 2.2 kg of hydrogen peroxide with a concentration of 27.5%, heat up to distillation, condense and use 10kg of dichloroethyl alkane solution to collect bromine and bromine vapor from exhaust gas.
[0048] After most of the bromine is evaporated, the temperature is lowered to 60 degrees Celsius, and then 5kg of dichloroethane is pumped in to azeotrope the remaining bromine in the reactor, and the orange red color in the reactor fades. The above bromine-containing dichloroethane solutions were combined, and the...
Embodiment 3
[0051] A method for treating pyraclostrobin brominated etherification waste liquid, comprising the following steps:
[0052] A. Bromination and etherification waste liquid mixing
[0053] The waste liquid from the bromination section and the waste liquid from the etherification section are combined to precipitate 0.1% to 2.5% of organic impurities, and the clarified liquid is obtained by centrifugal filtration; the centrifugal speed is 2000 to 3000r / min.
[0054] B. Acidification of waste liquid
[0055] Add 50% to 65% sulfuric acid to the clarified liquid to obtain acidic waste liquid; the pH of the acidic solution is ≤2;
[0056] C. Hydrogen peroxide reaction
[0057] Add hydrogen peroxide to the acidic waste liquid in step B to obtain a reaction solution;
[0058] D. Absorbing bromine and tail gas for the first time
[0059] Heating the reaction solution in step C to 80-95° C. for distillation, condensing and absorbing bromine with a bromine absorption reagent to obtain...
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