A kind of preparation method of n-dithioformyl-n,n-sodium diacetate chelating agent
A technology of dithioformic acid and sodium diacetate, which is applied in chemical instruments and methods, organic chemistry, water/sludge/sewage treatment, etc., and can solve the problems of affecting the use effect and low grafting rate of dithioformic acid groups , achieve the effects of fast sedimentation speed, improved chelation ability, and coarse flocs
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Embodiment 1
[0029] (1) Take 9.86g of iminodiacetonitrile with a mass fraction of 96.5% and add it to a 250mL three-necked flask with mechanical stirring, reflux condenser and dropping funnel, then add 98.6g of ethanol, stir well, and then add the mass fraction 4.38g of sodium hydroxide of 96.0%, then 6.2mL of carbon disulfide with a mass fraction of 99.0% was added dropwise within 60min at room temperature, then the reaction was continued at room temperature for 3h, and then the temperature was raised to 60°C to continue the reaction for 1h;
[0030] (2) The mixture obtained in step (1) was rotary evaporated at 60°C and -0.095MPa until no solvent dripped out, and 18.97 g of brown sticky matter was obtained; 89.5 g of ethanol collected by rotary evaporation was used for the next round of reaction;
[0031] (3) Transfer the brown viscous matter obtained in step (2) into a 500mL two-necked bottle with mechanical stirring and a condenser tube followed by an airway tube, add 284.6g of distilled...
Embodiment 2
[0036] (1) Get 9.86g mass fraction and be that the iminodiacetonitrile of 96.5% joins in the three-necked bottle of 250mL band mechanical stirring, reflux condenser and dropping funnel, then adds the ethanol 89.5g that embodiment 1 collects, adds again 28.8g of ethanol, fully stirred evenly, then added 4.58g of sodium hydroxide with a mass fraction of 96.0%, then added dropwise 6.5mL of carbon disulfide with a mass fraction of 99.0% within 50min at room temperature, and then continued the reaction at room temperature for 2.5h, Then the temperature was raised to 50° C. to continue the reaction for 2 h;
[0037] (2) The mixture obtained in step (1) was rotary evaporated at 60°C and -0.095MPa until no solvent dripped out to obtain 19.04 g of brown viscous substance; 106.4 g of ethanol collected by rotary evaporation was used for the next round of reaction;
[0038] (3) Transfer the brown viscous matter obtained in step (2) into a 500mL two-necked bottle with a mechanical stirrer ...
Embodiment 3
[0041] (1) get 9.86g mass fraction and be that the iminodiacetonitrile of 96.5% joins in the three-necked flask of 250mL band mechanical stirring, reflux condenser and dropping funnel, then adds the ethanol 106.4g that embodiment 2 collects, adds again 41.5g of ethanol, fully stirred evenly, then add 4.79g of sodium hydroxide with a mass fraction of 96.0%, then dropwise add 6.8mL of carbon disulfide with a mass fraction of 99.0% within 40min at room temperature, then continue the reaction at room temperature for 2h, then Raise the temperature to 50°C and continue the reaction for 1.5h;
[0042] (2) The mixture obtained in step (1) was rotary evaporated at 60°C and -0.095MPa until no solvent dripped out to obtain 18.74 g of brown viscous substance; 132.2 g of ethanol collected by rotary evaporation was used for the next round of reaction;
[0043] (3) Transfer the brown viscous matter obtained in step (2) into a 500mL two-necked bottle with mechanical stirring and a condenser t...
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