Treatment of waste water in producing isophthalic acid dicarbomethoxy-5-sodium sulphonate and its resource utilization method
A technology for the production of dimethyl isophthalate and waste water, which is applied in chemical instruments and methods, heating water/sewage treatment, adsorption water/sewage treatment, etc., can solve the problem of undiscovered dimethyl isophthalate-5- Sodium sulfonate production waste water treatment and resource recycling report and other issues, to achieve the effect of realizing waste recycling
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Embodiment 1
[0019] Pack 20mL (about 15g, dry weight) of NDA150 resin into an adsorption column (Φ20×250mm) with a heat preservation jacket.
[0020] Take 55mL of yellow dimethyl isophthalate-5-sodium sulfonate production wastewater, distill 5mL and cool to room temperature. The CODcr of the upper column liquid is 116800mg / L, and the content of dimethyl isophthalate-5-sodium sulfonate is 31600mg / L. At room temperature (25°C), the flow rate of 10mL / h passes through the resin column, and the adsorbed water is colorless. The content of dimethyl isophthalate-5-sodium sulfonate and its intermediate products is reduced to 1260mg / L, and the CODcr is reduced to 26400mg / L. After neutralization and aerobic biochemical treatment, the water can reach the national first-class discharge standard .
[0021] The adsorbed NDA150 resin is desorbed and regenerated with 40mL of hot water at a temperature of 85±5°C, and the flow rate is 10mL / h. The resin regenerated by desorption is reused. The desorption r...
Embodiment 2
[0023] Pack 200mL (about 150g, dry weight) of NDA150 resin into an adsorption column (Φ35×500mm) with an insulated jacket.
[0024] Take 600mL of yellow production wastewater, distill 60mL and cool to room temperature. The CODcr of the upper column liquid is 123500mg / L, and at room temperature (25°C) passes through the resin column at a flow rate of 100mL / h, and the adsorbed water is colorless, dimethyl isophthalate-5-sodium sulfonate and its intermediate product The content is reduced to 2160mg / L, and the CODcr is reduced to 38200mg / L. After neutralization and aerobic biochemical treatment, the water can reach the national first-level discharge standard.
[0025] The adsorbed NDA150 resin is desorbed and regenerated with 400mL of hot water at a temperature of 80±1°C, and the flow rate is 100mL / h. The resin regenerated by desorption is reused. The desorption rate of dimethyl isophthalate-5-sodium sulfonate was 95%. After the desorption solution (400mL) is distilled, the 340...
Embodiment 3
[0027] 600mL (about 450g, dry weight) of NDA150 resin was evenly packed in three glass columns (Φ35×500mm) with insulation jacket.
[0028] Take 1700mL light yellow production waste water, distill 200mL and cool to room temperature. The CODcr of the upper column liquid is 139400mg / L. At room temperature (25°C) with a flow rate of 200mL / h, it passes through three series-connected resin columns successively. - The content of sodium 5-sulfonate and its intermediate products is reduced to 440mg / L, and the CODcr is reduced to 10660mg / L. After neutralization and aerobic biochemical treatment, the water can reach the national first-level discharge standard.
[0029] The adsorbed NDA150 resin is desorbed and regenerated with 400mL of hot water at a temperature of 80±1℃ per column, and the flow rate is 100mL / h. The resin regenerated by desorption is reused. The desorption rate of dimethyl isophthalate-5-sodium sulfonate was 95%. The desorption solution (400mL) of each column was dis...
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