Process for preparing hydrogen sulfide
A technology of hydrogen sulfide and barium sulfide, applied in the production of hydrogen sulfide, inorganic chemistry. field, able to solve problems such as complex process
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Embodiment 1
[0060] 2-benzoylbenzoic acid is heated in concentrated sulfuric acid to carry out dehydration ring closure reaction, then the ring closure reaction solution is diluted with water, filtered, and the filter cake is washed with water to obtain anthraquinone filter cake. Filtrate and front part washing water merge, get sulfuric acid waste liquid, total acidity 2.41g-mol / L, H 2 SO 4 Content 2.40g-mol / L (referred to as 1 # spent acid), and the latter part of the washing water is used for the dilution process of the above-mentioned cyclization reaction solution and the initial water washing process of the filter cake.
[0061] Take the above H 2 SO 4 Content is 2.40g-mol / L sulfuric acid waste liquid 200mL (containing H 2 SO 4 0.48g-mol), put it in a 1000mL glass four-necked bottle, under electromagnetic stirring, drop 400mL of barium sulfide aqueous solution with a BaS content of 1.20g-mol / L (containing 0.48g BaS -mol), the hydrogen sulfide gas released during the reaction is ...
Embodiment 2
[0064] First add 400 mL of the barium sulfide aqueous solution with a BaS content of 1.20 g-mol / L described in Example 1 into a 1000 mL glass four-necked bottle, and then add dropwise the solution of Example 1 at 20°C → 50°C for 30 minutes under electromagnetic stirring. said 1 # 200mL of waste liquid containing sulfuric acid (H 2 SO 4 Content is 2.40g-mol / L), the hydrogen sulfide gas escaped is absorbed with 600mL of sodium hydroxide aqueous solution 600mL with concentration of 2.00g-mol / L, after measuring, the yield of hydrogen sulfide gas is more than 85.5%, and the purity is 98% %above. After the hydrogen sulfide gas escapes, the residual slurry liquid is filtered, the filter cake is washed with water and dried to obtain barium sulfate with a yield of over 94% and a content of over 98%.
[0065] The filtrate and washing water after filtering out the barium sulfate can be used for leaching the barium sulfide roasted body to prepare the barium sulfide aqueous solution.
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Embodiment 3
[0068] The H described in Example 1 2 SO 4 1 with a content of 2.40g-mol / L # 200mL of waste liquid containing sulfuric acid and 400mL of barium sulfide aqueous solution with a BaS content of 1.20g-mol / L were added to a 1000mL glass four-neck flask with electromagnetic stirring at a uniform flow rate for 30 minutes at 20°C → 50°C. The hydrogen sulfide gas produced is absorbed by 600 mL of aqueous sodium hydroxide solution with a concentration of 2.00 g-mol / L. After measurement, the yield of hydrogen sulfide gas is above 85.5%, and the purity is above 98%. After the hydrogen sulfide gas escapes, the residual slurry liquid is filtered, the filter cake is washed with water and dried to obtain barium sulfate with a yield of over 94% and a content of over 98%. This operation method is not only a batch operation, but also a time period of the continuous operation of the tank.
[0069] The filtrate and washing water after filtering out the barium sulfate can be used for leaching th...
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