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A kind of mercury scavenger and its preparation method and application
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A capture agent and treatment method technology, applied in separation methods, chemical instruments and methods, dispersed particle separation, etc., can solve problems such as difficult to remove, increase in volume, and easy to volatilize, and achieve high-efficiency removal effects
Active Publication Date: 2016-05-25
深圳市百欧森环保科技股份有限公司
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Problems solved by technology
Atomic monovalent mercury is insoluble in water, volatile, difficult to attach to the surface of soot particles, remains in the gas phase for a long time, and is difficult to be removed by wet scrubbing systems and dust collection systems
[0005] Existing mercury scavenger in the preparation process, the final product will contain excessive CS 2 , CS 2 overdose can cause odor
And excess CS 2 In the synthesis of dithiocarbamic acid, trithiocarbonates such as sodium trithiocarbonate will be generated, and the trithiocarbonate will appear red, coloring the nearly colorless dithiocarbamate to reduce diethyl Value of Potassium Dithiocarbamate Metal Salt
Moreover, when trithiocarbonate is used, it will release CS 2 , increase the already existing CS 2 amount, causing harm to the human body
Method used
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Embodiment 1
[0050] A mercury trap, weigh out 12.9g (0.1mol) of dibutylamine, 0.5g of potassium bicarbonate, 4g (0.1mol) of potassium hydroxide and CS 2 7.6g (0.1 mole).
[0051] Inject 45g of water into the reactor (power on), drop into CS at a temperature of 40℃ 2 7.6g (0.1 mol), keep the constant temperature to react for 2 hours, after cooling, insert CS from the top of the reactor 2 When the detection tube is quantified, its value is below the quantification limit of 0.63 ppm. The aqueous solution of potassium dibutyl dithioate is slightly yellowish liquid. 2 The ratio is 99.8%.
[0052] The preparation method of the mercury capture agent includes the following steps:
[0053] a. Take 0.5g of potassium bicarbonate and mix with 12.9g of dibutylamine and 4g of potassium hydroxide, and then dissolve with 45g of water to obtain a mixture solution;
[0054] b. Add the mixture solution obtained in step a to the reactor, then heat to 40°C, and then add 7.6g of carbon disulfide to the mixture;
[0055]...
Embodiment 2
[0058] A mercury trap, weigh 7.4 g of diethylamine, and other conditions are the same as in Example 1. After the reaction is over, cool the reaction liquid, and then insert the CS from the top of the reactor 2 Quantitative test on detection tube, CS 2 The concentration value of is 0.47ppm. Titration of CS with iodine 2 The ratio is 99.7%.
Embodiment 3
[0060] A mercury trap, weighing 11.3 g of dibutylamine substituted 40% dimethylamine, taking 30 g of water, and other conditions as in Example 1. After the reaction is over, cool the reaction liquid, and then insert the CS from the top of the reactor 2 Quantitative test on detection tube, CS 2 The concentration value of is 0.48ppm. Titration of CS with iodine 2 The ratio is 99.6%.
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Abstract
The invention relates to a mercury catching agent which is prepared from following components including: an amine, carbon disulfide, potassium hydroxide and one of an inorganic carbonate and an inorganic bicarbonate, wherein a molar ratio of the amine to the carbon disulfide is 1:0.95-1; the molar ratio of the potassium hydroxide to the amine is 1:1; and a mass ratio of the inorganic carbonate, or the inorganic bicarbonate, to the potassium hydroxide is 1:5-200. The invention also relates to a preparation method of the mercury catching agent and a treatment method of mercury-containing coal-fired flue gas through the mercury catching agent. The mercury catching agent is high in efficiency and the preparation method is less in by-products and is high in efficiency. An efficiency of the treatment method of the mercury-containing coal-fired flue gas is high.
Description
Technical field [0001] The invention relates to a heavy metal capture agent and a preparation method and application thereof, in particular to a mercury capture agent and a preparation method and application thereof. Background technique [0002] The acute toxicity (50% lethal dose) of mercury is extremely strong, and the chronic toxicity is mainly manifested as central nervous disorder. In addition, it also has reproductive toxicity, immunotoxicity, mutation toxicity (chromosomal abnormality) and ecological toxicity. Monomer mercury is in a liquid state at room temperature The only metal that has a low melting point and can also evaporate at room temperature to pollute the atmosphere. The main sources of mercury are coal fire, waste combustion, and non-ferrous metal refining. [0003] The amount of coal used in our country is huge, and the discharge of toxic and harmful substances is huge. According to the Social Development Research Center of the Chinese Academy of Social Scienc...
Claims
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