Method for processing process waste water of dimethyl ether preparation by dehydrating methyl alcohol
A technology for methanol dehydration and wastewater treatment, which is used in water/sewage multi-stage treatment, heating water/sewage treatment, water/sludge/sewage treatment, etc., to achieve the effect of resource utilization
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Embodiment 1
[0027] Wastewater source: methanol liquid phase dehydration to produce dimethyl ether process wastewater.
[0028] a. Use an 8-effect evaporator to distill the waste water, the condensate accounts for about 30% of the total water, the COD of the condensate is about 35,000 mg / L, the distillation raffinate accounts for about 70% of the total water, and the COD is about 800mg / L.
[0029] b. Perform reverse osmosis membrane separation on the condensate described in a. The recovered organic matter is processed into different products through separation and purification. The COD of the aqueous phase is relatively high (about 200mg / L), and it is combined with the distillation raffinate.
[0030] c. The distillation raffinate mentioned in a above is treated by a conventional combined treatment process of two-stage UASB anaerobic reactor, aerobic activated sludge process, biological contact oxidation, and sand filtration. The effluent COD is less than 60mg / L. The biogas produced b...
Embodiment 2
[0033] Wastewater source: Wastewater from methanol gas phase dehydration to produce dimethyl ether process.
[0034]a. Use a simple distillation system to distill the waste water, the condensate accounts for about 20% of the total water, and the COD in the condensate is about 15,000 mg / L. The distillation raffinate accounts for about 80% of the total water, and the COD is about 1000mg / L.
[0035] b. The condensate mentioned in a above is deeply purified by a purification process mainly based on membrane separation. The concentrated solution of membrane separation, that is, the organic matter can be reused in the production process of methanol dehydration to produce dimethyl ether after recovery, or can be separated and purified by other means to be processed into different products. The effluent COD is less than 20mg / L, the pH value is between 7.0-8.0, the total dissolved solids (TDS) content is less than 100mg / L, and the turbidity is less than 1.0NTU, which meets the water q...
Embodiment 3
[0039] Wastewater source: Syngas one-step preparation of dimethyl ether process wastewater.
[0040] a. Use a 2-effect evaporator to evaporate the effluent water mentioned in the above a. The condensate accounts for about 10% of the total water, and the COD of the condensate is about 20,000 mg / L. The distillation raffinate accounts for about 90% of the total water, and the COD is about 2000mg / L.
[0041] b. The condensate mentioned in a above is deeply purified by a purification process mainly based on membrane separation. After the organic matter is recovered, it can be reused in the production process of methanol dehydration to produce dimethyl ether or separated and purified by other means to be processed into different products. The COD of the water phase is low (about 25mg / L), and it can be directly reused in the boiler.
[0042] c. The distillation raffinate mentioned in a above is treated by a conventional combined treatment process of two-stage UASB anaerobic reactor...
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