Method for recycling aniline and methanol from mixed waste water of aniline and methanol
A technology of mixing wastewater and methanol water, which is applied in chemical instruments and methods, preparation of organic compounds, preparation of hydroxyl compounds, etc., can solve the problems of wasting resources and increasing the difficulty of treatment, and achieve the effect of high recovery efficiency and simple process
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Embodiment 1
[0017] Take 1000g of mixed wastewater containing aniline and methanol (aniline content 20%, methanol content 30%), concentrate under reduced pressure at 50 degrees vacuum -0.09Mpa to 250g (methanol content is less than 1%), cool down to 25 degrees, and stand layered. The lower layer is the aniline layer, and 180 g of aniline is concentrated under reduced pressure at 80 degrees vacuum to -0.95 Mpa. The purity of aniline is greater than 98%, and the water content is less than 0.5%.
[0018] The upper layer is the water layer, which contains a small amount of methanol and aniline, and is extracted twice by adding 2*50g of dichloromethane. The methylene chloride layer was desolvated under reduced pressure at 40°C, and the remaining aniline was distilled under reduced pressure at 100°C to recover 15 g of aniline with a purity greater than 98%. The content of aniline in the upper water layer is less than 200 mg per liter, which can be treated by biochemical methods.
[0019] The d...
Embodiment 2
[0021] Take 1000g of mixed wastewater containing aniline and methanol (aniline content 35%, methanol content 15%), concentrate under reduced pressure to 400g (methanol content is less than 1%) under 70 degree vacuum degree-0.085Mpa, cool to 30 degrees, static Set layers. The lower layer is the aniline layer, and 300 g of aniline is concentrated under reduced pressure at 150 degrees vacuum degree-0.08Mpa. The purity of aniline is greater than 98%, and the water content is less than 0.5%.
[0022] The upper layer is the water layer, which contains a small amount of methanol and aniline, and is extracted twice by adding 2*50g of dichloromethane. The dichloromethane layer was desolvated under reduced pressure at 40°C, and the remaining aniline was distilled under reduced pressure at 100°C to recover 20 g of aniline with a purity greater than 98%. The content of aniline in the upper water layer is less than 200 mg per liter, which can be treated by biochemical methods.
[0023] T...
Embodiment 3
[0025] Take 1000g of mixed wastewater containing aniline and methanol (aniline content 15%, methanol content 35%), concentrate under reduced pressure at 60 degrees vacuum -0.08Mpa to 200g (methanol content is less than 1%), cool down to 30 degrees, and stand layered. The lower layer is the aniline layer, and 120 g of aniline is concentrated under reduced pressure at 100 degrees vacuum degree-0.09Mpa. The purity of aniline is greater than 98%, and the water content is less than 0.5%.
[0026] The upper layer is the water layer, which contains a small amount of methanol and aniline, and is extracted twice by adding 2*50g of dichloromethane. The dichloromethane layer was desolvated under reduced pressure at 40°C, and the remaining aniline was distilled under reduced pressure at 100°C to recover 15 g of aniline with a purity greater than 98%. The content of aniline in the upper water layer is less than 200 mg per liter, which can be treated by biochemical methods.
[0027] The d...
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