Experimetal Study And Simnulating Computation Of The Process Of Recovering Ethyl Acetate Form Its Manufactural Waste Water

Ethyl acetate is an excellent solvent and extractant and is an important chemical material too. During the process of ethyl acetate, three kinds of waste water were let out because of separating, refining the product and products changing of the device. These waste water contain a great of ethyl acetate which can be reclaimed. Usually, the waste water were sold as low value products or were burn off as waste, even were let out to pollute environment. In order to reclaiming ethyl acetate form these waste water, separate projects of these waste water were studied in this paper.According to the different components of the waste water and reclaiming requests, extractive distillation experiment was studied with the light and middling components of waste water. The experimental results indicated that the effect of extracting ethanol is obvious using water as an extractant, and the content of ethyl acetate in top distillation could receive 90%, in which the content of ethanol was no more than 1% and water was about 10%. Changing the reflux ratio and solvent quantity indicated that when the reflux ratio was 0.5~1.0 and solvent quantity ratio was 1.0~1.5:1.0, the separate effect of the light components waste water was the most obvious and of the middling components waste water, the reflux ratio was 0.5~1.0, solvent quantity ratio was 0.6~0.8:1.0. A simple distillation was able to recover the valuable components from weightily components waste water.The content of water in the three top distillates was about 10%. Drying the top distillates with sodium sulfate showed that 1 mol sodium sulfate could be combined with 4 mol water and the water content in the products was no more than 0.4% after dehydration. The experimental result indicated that the desiccant could be regenerated by dry air under 102℃ with about 60 minutes.In order to applying the method to industry, the extractive distillation of light and middling components waste water, the key link of the method, was simulated with ASPEN PLUS and its manipulate parameters were analyzed. It showed that simulating results were consistent with experimental results.The separating methods and processes were analyzed and evaluated. The resultsshowed that three kinds of waste water can be treated with a same equipment, recovered products from ethyl acetate waste water could bring an obvious benefit in economy and environment.