13. In the waste waters of methanol production, the content of the main product reaches 1%. Calculate the methanol content in the effluent if, before discharge, the waste water is continuously extractively purified with ether with an effective number of stages equal to four, and the total extractant consumption is 1 m3 per 1 m3 of treated water. The distribution coefficient is taken equal to 1.09, and the density of waste water is 1000 kg/m3. Answer: 0.44%.

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