| 摘要 |
A method reducing wastewater in a polyester-manufacturing plant includes a step in which ethylene glycol-containing composition from at least one of the chemical reactors is provided to a water separation column. The water se paration column is kept within a predetermined temperature range such that a ny acetaldehyde present in the water separation column is substantially main tained in a vapor state. A waste-vapor mixture comprising one or more organi c compounds is subsequently removed from the water separation column and com busted. The polyester-manufacturing plant optionally includes a spray conden ser system having a heat exchanger such that the heat exchanger is contacted with a hot ethylene glycol composition derived from the water separation co lumn when the heat exchanger needs cleaning. The polyester- manufacturing pl ant may be enclosed with a roof and walls such that rainwater is prevented f rom being contaminated with any organic chemicals present in the polyester-m anufacturing plant.
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