Method of treating phenol-containing effluent and recovering resource in 2-methyl-4-chlorophenoxyacetic acid producing process
A technology for resource recovery and chlorine production, applied in the direction of adsorption water/sewage treatment, etc., can solve problems such as reports on the treatment of phenol-containing wastewater and resource recovery and utilization that have not been found
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Embodiment 1
[0018] Put 10 mL (about 7.5 grams) of NDA-99 ultra-highly cross-linked macroporous adsorption resin into a jacketed glass adsorption column (φ12×160mm). At room temperature (20-25°C), the light yellow strongly acidic phenol-containing wastewater (pH=0.86) discharged from the production process of 2-methyl-4-chloride is filtered and passed through the resin bed at a flow rate of 40mL / h, and the wastewater treatment capacity is 220mL / batch. The phenol content of the raw wastewater is 2333mg / L, the adsorbed water is colorless and transparent, the phenol content is 2.88mg / L, and the phenol removal rate is >99%.
[0019] Use 20mL 2mol / L NaOH aqueous solution, 10mL 1mol / L NaOH aqueous solution and 20mL tap water to pass through the resin bed at a temperature of 60±5°C at a flow rate of 15mL / h for desorption, and the phenol desorption rate is >99%. The 10mL desorption liquid that just flowed out was brownish red, which was a high-concentration desorption liquid with a phenol conten...
Embodiment 2
[0021] Put 100mL (about 75g) of NDA-99 resin into a jacketed glass adsorption column (φ32×360mm). At room temperature (25-30°C), the light yellow strongly acidic phenol-containing wastewater (pH=1.02) discharged from the production process of 2-methyl-4-chloride is filtered and passed through the resin bed at a flow rate of 350mL / h, and the wastewater treatment capacity is 2250mL / batch. The phenol content of the raw wastewater is 2387 mg / L, the adsorbed water is colorless and transparent, the phenol content is 3.23 mg / L, and the phenol removal rate is >99%.
[0022] Use 200mL 2mol / L NaOH aqueous solution, 100mL 1mol / L NaOH aqueous solution and 200mL tap water at a temperature of 60±5°C to pass through the resin bed at a flow rate of 100mL / h for desorption, and the phenol desorption rate is >99%. The 100mL desorption liquid that just started to flow out was brownish red, which was a high-concentration desorption liquid with a phenol content of 42358 mg / L. Use 37% hydrochlori...
Embodiment 3
[0024] A) Adsorption process
[0025] Choose 3 adsorption towers with the same specification (φ600×3500mm), and fill each tower with 600 kg (about 800L) of NDA-99 resin. At room temperature (25~30 DEG C), the light yellow strongly acidic phenol-containing waste water (phenol content 2431mg / L) discharged in the production process of 2-methyl-4-chlorine is pumped into the adsorption tower after filtration, and the adsorption adopts I, The method of co-current adsorption with two towers connected in series in the II tower, the adsorption flow rate is 3.2m 3 / h, the processing volume of each batch is controlled at 20m 3 . After the wastewater is treated, the phenol content in the effluent drops to 3.16mg / L, which can reach the discharge standard after biochemical treatment.
[0026] B) Desorption regeneration
[0027] The adsorbed first column I tower is desorbed with NaOH aqueous solution. The specific operation steps are as follows: first drain the residual liquid in tower ...
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