Defluorination method of acidic aqueous solution containing hydrofluoric acid
A technology of acidic aqueous solution and hydrofluoric acid, applied in chemical instruments and methods, chlorine/hydrogen chloride, halogen/halogen acid, etc., can solve the problems of bringing in metal ions, low defluorination rate, poor treatment effect, etc., to achieve High operating flexibility, avoiding chlorination process, and high defluorination efficiency
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Embodiment 1
[0048] (1) Add 500g of 16.3% by mass hydrochloric acid (fluorine-containing 1980ppm) into a 1L polyethylene reactor, then add 40g of trimethylchlorosilane, and stir at 20°C for 60min.
[0049] (2) After the reaction is over, the layers are static and the reaction solution is divided into two layers, which are separated by a separatory funnel. The lower layer liquid is defluorinated hydrochloric acid (fluorine-containing 7.2ppm), and the upper layer is an organosilicon mixture containing trimethylfluorosilane, hexamethyldisiloxane and a small amount of trimethylsilanol.
[0050] (3) Mix the organosilicon mixture obtained in step (2) with 50 g of a 10% aqueous sodium hydroxide solution by mass, and stir at 20° C. for 60 min to hydrolyze trimethylfluorosilane to generate trimethylsilanol, The trimethylsilanol is then condensed to give hexamethyldisiloxane with a small amount of trimethylsilanol.
[0051] (4) After the regeneration reaction is finished, the layers are statically ...
Embodiment 2
[0053] (1) Add 500g of 31.8% hydrochloric acid (containing F 1640ppm) into a 1L polyethylene reactor, then add 10g of trimethylchlorosilane and 30g of hexamethyldisiloxane at 40°C The reaction was stirred for 10 min.
[0054] (2) After the reaction is over, the layers are static and the reaction solution is divided into two layers, which are separated by a separatory funnel. The lower layer liquid is defluorinated hydrochloric acid (3.2 ppm fluorine content). The upper layer is a silicone mixture containing trimethylfluorosilane, hexamethyldisiloxane and a small amount of trimethylsilanol and trimethylchlorosilane.
[0055] (3) Mix the organosilicon mixture obtained in step (2) with 50 g of a 20% aqueous sodium hydroxide solution by mass, and stir at 25° C. for 50 min to hydrolyze trimethylfluorosilane to generate trimethylsilanol, and then Condensation of trimethylsilanol yields hexamethyldisiloxane.
[0056] (4) After the regeneration reaction is finished, the layers are ...
Embodiment 3
[0058] (1) Add 500 g of 31% hydrochloric acid (containing 1840 ppm fluorine) into a 1L polyethylene reactor, then add 20 g of trimethylchlorosilane, and stir at 30° C. for 30 min.
[0059] (2) After the reaction is over, the layers are static and the reaction solution is divided into two layers, which are separated by a separatory funnel. The lower layer liquid is defluorinated hydrochloric acid (3.8 ppm of fluorine), and the upper layer is an organosilicon mixture containing trimethylfluorosilane, hexamethyldisiloxane and a small amount of trimethylsilanol.
[0060] (3) Mix the organosilicon mixture obtained in step (2) with 50 g of a 25% aqueous potassium hydroxide solution by mass, and stir at 30° C. for 40 min to hydrolyze trimethylfluorosilane to generate trimethylsilanol, The trimethylsilanol is then condensed to give hexamethyldisiloxane with a small amount of trimethylsilanol.
[0061] (4) After the regeneration reaction is finished, the layers are statically separate...
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