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Membrane separation type solvent dehydration system

Great attention is recently being paid to global environmental issues, and it is now conceivable that companies will need to treat used solvents themselves. In consideration of this kind of social issue, we have developed a “membrane separation type solvent dehydration system,” which uses a polyimide membrane with superior dehydration properties developed by Ube Industries, Ltd. in combination with our own distillation and concentration technology that has resulted in solvents being more easily recovered.

THREE:The heat to-day has suddenly become stifling; the low clouds veil the colourless sun, and the flowers, which yesterday were still lovely, are now[Pg 278] withered and pallid, and only give out their scent in the evening, when it is cool again.
  • 1Under the distillation system, even in case of azeotropic solvent compositions, this system which remove water vapor by the polyimide membrane will easily dehydrate.
  • 2In comparison with the distillation system, it significantly saves on use of steam.
  • 3Dehydration can be performed through merely supplying evaporated vapor to the membrane module and maintaining the differential pressure between the permeable side and the impermeable side.
  • 4Solvent purity of 99.9% or more can be achieved by carrying out dehydration with a polyimide membrane only.
  • 5The polyimide membrane has superior heat and solvent resistance. Therefore, the vapor permeation system reduces contamination of the membrane and thus extends its life.
THREE:The palace of the Rajah of Nagpoor, with its two towers, overlooks the river from above a broad stairway. A balcony quite at the top is supported on a massive cornice lightly carved into acanthus leaves. The damp has subdued the red colour of the building, fading it especially at the base, and from a distance it might be fancied that a veil of thin gauze had been hung over the palace, and fastened beneath the carved parapet.

The aromatic polyimide membrane is highly permeable to water vapor but less permeable to vapors of organic compounds such as alcohol etc.

THREE:Outside the town of Delhi a road bordered by great trees leads across the white plain, all strewn with temples and tombs, to Khoutab, the ancient capital of the Mogulsa dead city, where the ruins still standing in many places speak of a past of unimaginable splendour. There is a colossal tower of red masonry that springs from the soil with no basement; it is reeded from top to bottom, gradually growing thinner as it rises, with fillets of letters in relief, and balconies on brackets as light as ribbands alternating to the top. It is an enormous mass of red stone, which the ages have scarcely discoloured,[Pg 219] and was built by Khoutab-Oudeen Eibek to commemorate his victory over the Sultan Pithri-Raj, the triumph of Islam over Brahminism.On quitting Hyderabad, to the right and left of the iron road, the landscape was for a long way the same; rocks, that looked as if they had been piled up and then rolled over, lay in russet heaps among peaceful little blue lakes without number, breaking the monotony of the wide, scorched fields, a sheet of pure gold. At one of the stations a beggar was rattling his castanets furiously, and singing something very lively and joyous. At the end of each verse he shouted an unexpected "Oh!" just like the cry of a Paris ragamuffin.
  • 1 Recovery of the detergent solvent Recovery of the cleaning solvent such as electronic parts industry, precision instrument industry.
  • 2Solvent recovery and the refinement Solvent recovery and the refinement such as chemical industry, an industry of medical supplies, food industry, the fermentation industry.
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Acetone, ethanol, methyl ethyl ketone, butanol, isopropyl alcohol, ethyl acetate, methyl isobutyl ketone, others (including hexane and toluene).