Method for treating diethyl (o-) phthalate waste water and recovering diethyl (o-) phthalate from it
A diethyl phthalate and wastewater technology, which is applied in the preparation of carboxylic acid esters, chemical instruments and methods, and adsorption water/sewage treatment, can solve the problems of resource waste, ineffective treatment, and threats to human health. Achieve good regeneration performance and realize the effect of resource recycling and reuse
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Embodiment 1
[0018] Put 3mL (about 1 gram) of macroporous adsorption resin NDA-150 into a jacketed glass adsorption column (Φ12×160mm). Wastewater diethyl phthalate is 500mg / L. After filtering, pass it through the resin bed at a flow rate of 15mL / h at 25±5°C, and the treatment capacity is 1650mL / batch. After being adsorbed by the resin, the average concentration of diethyl phthalate in the adsorbed water is less than 1mg / L.
[0019] When the adsorption reaches the leakage point (the immediate concentration of diethyl phthalate in the adsorbed water is 2% of the influent concentration), the adsorption is stopped, and 20mL of methanol is flowed at a flow rate of 6mL / h at a temperature of 40±5°C. Flow through the resin bed for desorption. The methanol solution of the desorbed diethyl phthalate is rectified, the distilled methanol is used as a desorbing agent for the next batch of desorption operations, and the residual diethyl phthalate is recovered as a chemical product.
Embodiment 2
[0021] Put 30mL (about 10g) of NDA-150 resin into a jacketed glass adsorption column (Φ16×180mm). Wastewater diethyl phthalate is 300mg / L. After filtering, pass it through the resin bed at 40±5°C at a flow rate of 450mL / h, and the treatment capacity is 8900mL / batch. After being adsorbed by the resin, the average concentration of diethyl phthalate in the adsorbed water is less than 2mg / L.
[0022] When the adsorption reaches the leakage point (the immediate concentration of diethyl phthalate in the adsorbed water is 2% of the influent concentration), the adsorption is stopped, and 100mL volume percentage of 95% ethanol solution is placed at a temperature of 50±5°C to The flow rate of 150mL / h flows through the resin bed for desorption. The ethanol solution of the desorbed diethyl phthalate is rectified, and the distilled ethanol is used as a desorbing agent for the next batch of desorption operations, and the residual diethyl phthalate is used as a chemical product.
Embodiment 3
[0024] Put 600mL (about 200g) of ND-150 resin into a jacketed glass adsorption column (Φ70×500mm). Wastewater diethyl phthalate is 400mg / L. After filtering, pass it through the resin bed at a flow rate of 6000mL / h at 10±5°C, and the treatment capacity is 300000mL / batch. After being adsorbed by the resin, the average concentration of diethyl phthalate in the effluent is less than 1.5mg / L.
[0025] When the adsorption reaches the leakage point (the immediate concentration of diethyl phthalate in the adsorbed water is 2% of the influent concentration), the adsorption is stopped, and 3000mL of 80% ethanol is placed at a temperature of 60±5°C at a flow rate of 1800mL / h Desorption is performed cocurrently through the resin bed. The ethanol solution of the desorbed diethyl phthalate is rectified, and the distilled ethanol is used as a desorbing agent for the next batch of desorption operations, and the residual diethyl phthalate is used as a chemical product.
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