Request for process design of nitrogen stripping to remove dichloromethane from wastewater
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Design conditions 1. Feed stream: (1) Component moisture content: 5000 KG/H; dichloromethane: 50 KG/H； (2) Feed pressure: 1.1 bar, temperature: 60 degrees. 2. Process flow and objectives: The feed stream and nitrogen (which is a recycled stream) enter the stripping tower for stripping; the liquid phase, which is wastewater of low concentration, goes to the wastewater treatment station, while the gas phase contains nitrogen, water, and dichloromethane. Nitrogen is separated from water and dichloromethane after compression or freezing. Nitrogen is recycled to the stripping tower. Now I’m creating one that does not converge; see the attachment. I would like to ask how to do it. My email address is 467675894@qq.COM
Why must nitrogen be used? Couldn’t distillation be used instead? A phase separator can be installed at the top of the tower; the aqueous phase is recycled while the organic phase is collected – that would be dichloromethane, right?