Treatment method for rectification waste liquid generated in maleimide production process
A maleimide and production process technology, applied in the field of treatment of rectification waste liquid, can solve the problems of human health damage, low fertility, ecological environment pollution, etc., achieve good economic and environmental benefits, reduce waste liquid Emissions, the effect of avoiding environmental pollution
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Embodiment 1
[0019] The processing method of the rectification waste liquid of output in the maleimide production process of the present embodiment may further comprise the steps:
[0020] 1) Take 1L of rectification waste liquid at the bottom of the still after rectifying acetone, detect its boiling point > 80°C, pass it into the distillation pot, and carry out distillation below 140°C, the steam temperature is 98°C, until there is no distillate Just flow out, the distillation time is 2 hours, collect about 0.9L of distillate A below 140°C; the residual high-boiling point waste liquid after the distillation, after adding ferric sulfite flocculant, settle to obtain a colloidal solid;
[0021] 2) Add 660mL of sodium hydroxide solution with a mass fraction of 20% to the distillate A obtained in step 1) for neutralization, and the pH value of the neutralized mixed solution is measured to be 8-9;
[0022] 3) Heat and distill the mixture obtained in step 2) below 100°C, collect the distillate B...
Embodiment 2
[0024] The processing method of the rectification waste liquid of output in the maleimide production process of the present embodiment may further comprise the steps:
[0025] 1) Take 2L of rectification waste liquid at the bottom of the still after rectifying acetone, detect its boiling point > 80°C, pass it into the distillation pot, and carry out distillation below 120°C. The steam temperature is 94-98°C until there is no distillation. The effluent can just flow out, the distillation time is 4 hours, and about 1.75L of distillate A below 140°C is collected; the residual high-boiling point waste liquid after the distillation is added to ferric sulfite flocculant and settled to obtain a colloidal solid;
[0026] 2) Add 1.7L of sodium carbonate solution with a mass fraction of 20% to the distillate A obtained in step 1) for neutralization, and the pH value of the neutralized mixed solution is measured to be 9;
[0027] 3) Heat and distill the mixture obtained in step 2) below ...
Embodiment 3
[0029] The processing method of the rectification waste liquid of output in the maleimide production process of the present embodiment may further comprise the steps:
[0030] 1) Take 1L of rectification waste liquid at the bottom of the still after rectifying acetone, detect its boiling point at 94°C, pass it into the distillation pot, and carry out distillation at a temperature below 140°C. The steam temperature is 98°C until no distillate flows out That is, the distillation time is 2 hours, and about 0.85 L of distillate A below 140 ° C is collected; the residual high-boiling point waste liquid after the distillation is added to ferric sulfite flocculant and settled to obtain a colloidal solid;
[0031] 2) Add 1.4L of sodium bicarbonate solution with a mass fraction of 20% to the distillate A obtained in step 1) for neutralization, and the pH value of the neutralized mixed solution is measured to be 8-9;
[0032] 3) Heat and distill the mixture obtained in step 2) below 110...
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