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A device and method for catalytic dehydrogenation of chlorine in chlor-alkali industrial tail and preparation of ferric chloride
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A technology for catalytic dehydrogenation and chlor-alkali industry, used in chlorine/hydrogen chloride, chemical instruments and methods, chlorine/hydrogen chloride purification, etc., can solve the problems of complex procedures and high operating costs, achieve low reaction temperature, solve safety problems, and improve industrial performance. effect of benefit
Inactive Publication Date: 2019-03-01
TAIYUAN UNIV OF TECH
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[0004] In the tail chlorine dehydrogenation scheme reported in the existing literature, the catalyst must be reduced before it can be reused, which makes the process complicated and the operation cost high
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Embodiment 1
[0043] Example 1: A method for catalytic dehydrogenation of chlorine in chlor-alkali industrial tails and preparation of ferric chloride
[0044] The components of industrial tail chlorine are: H 2 , 3.97%; Cl 2 , 72.85%; O 2 , 9.93%; N 2 , 13.25%.
[0045] Iron powder is used as catalyst. The catalyst packing height is 0.35m, the reaction temperature is 110°C, and the apparent operating gas velocity Uf=0.3m / s. When the tail chlorine is dehydrogenated under this condition, the conversion rate of hydrogen can reach 96.75%, the conversion rate of ferric chloride is 25.22%, and the concentration of ferric chloride is 41%. The residence time of the catalyst in the reaction fluidized bed is 2.5h. The residence time of the catalyst in the settling tank is 2h.
Embodiment 2
[0046] Embodiment 2: A kind of method for catalytic dehydrogenation of chlor-alkali industrial tail chlorine and preparation of ferric chloride
[0047] The components of industrial tail chlorine are: H 2 , 3.05%; Cl 2 , 72.36%; O 2 , 10.31%; N 2 , 14.25%.
[0048] Using iron filings as a catalyst. The catalyst packing height is 0.45m, the reaction temperature is 120°C, and the apparent operating gas velocity Uf=0.35m / s. When the tail chlorine is dehydrogenated under this condition, the conversion rate of hydrogen can reach 98.39%, the conversion rate of ferric chloride is 22.57%, and the concentration of ferric chloride solution is 42%. The residence time of the catalyst in the reaction fluidized bed is 3.5h. The residence time of the catalyst in the settling tank is 2.5h.
Embodiment 3
[0049] Example 3: A method for catalytic dehydrogenation of chlorine in chlor-alkali industrial tails and preparation of ferric chloride
[0050] The components of industrial tail chlorine are: H 2 , 3.97%; Cl 2 , 72.85%; O 2 , 9.93%; N 2 , 13.25%.
[0051] Using porous iron as catalyst. The catalyst packing height is 0.45m, the reaction temperature is 105°C, and the apparent operating gas velocity Uf=0.35m / s. When tail chlorine is dehydrogenated under this condition, the conversion rate of hydrogen can reach 94.06%, the conversion rate of ferric chloride is 19.03%, and the concentration of ferric chloride solution is 41%. The residence time of the catalyst in the reaction fluidized bed is 2.5h. The residence time of the catalyst in the settling tank is 2.5h.
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Abstract
The invention discloses a device and method for catalytic dehydrogenation and ferricchloride preparation of tailchlorine in the chlor-alkali industry. The device comprises a dehydrogenation reaction device and a ferricchloride preparation device, wherein the dehydrogenation reaction device comprises a reaction fluidized bed, a first cyclone separator and a tailchlorine heater; the ferricchloride preparation device comprises a catalyst storage tank, a nitrogen heater, a second cyclone separator and a sedimentation tank. Tailchlorine dehydrogenation reaction and chlorination reaction are performed at the same time, the tail chlorine enters the reaction fluidized bed for catalytic dehydrogenation reaction at low temperature in the presence of an iron catalyst, and meanwhile, the iron catalyst is chlorinated; the iron catalyst enters the catalyst storage tank and the sedimentation tank, and chlorinated ferric trichloride and iron which is not chlorinated are separated. According to the device and the method, the requirement of catalytic dehydrogenation of the tail chlorine during industrial production is met, meanwhile, an industrial production ferric chloride is prepared, the industrial cost is reduced, and benefits are improved.
Description
technical field [0001] The invention relates to a device and method for catalytic dehydrogenation of chlorine tail in chlor-alkali industry and preparation of ferric chloride, belonging to the technical field of catalytic dehydrogenation of chlorine tail in chlor-alkali industry. Background technique [0002] The tail chlorine in the chlor-alkali industry is mainly composed of chlorine gas, including mixed gases such as oxygen, nitrogen and hydrogen. Among them, the content of chlorine gas is about 65-85%, nitrogen is about 10-15%, oxygen is about 5-10%, hydrogen It is about 1.5 to 4%, and the explosion limit of hydrogen is 4%. The existence of hydrogen has become the biggest safety hazard in tail chlorine treatment. The traditional chlor-alkali industry usually converts hydrogen and chlorine into hydrochloric acid through high temperature combustion to remove the hydrogen in the tail chlorine and consume the tail chlorine at the same time. However, the chlorine gas in the ...
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