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TWO:

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:Very early in the morning, on emerging from[Pg 164] the gloom of the narrow streets, there is a sudden blaze of glory, the rising sun, purple and gold, reflected in the Ganges, the waters throbbing like fiery opal. The people hurry to the shore carrying trays piled high with flowers and offerings. The women carry little jars in their hands looking like burnished gold, and containing a few drops of scented oil to anoint themselves withal after bathing. These jars are covered with roses and jasmine blossoms, to be sent floating down the sacred stream as an offering to the gods. The steps are crowded already with the faithful, who have waited till Surya the day-star should rise, before going through their devotional ablutions. With a great hubbub of shouts and cries, and laughter and squabbling, this throng pushes and hustles, while those unimaginable priests sit stolidly under their wicker sunshades, mumbling their prayers, and accepting alms and gifts. All along the river there are people bathing on the steps which go down under the water, the men naked all but a loin-cloth, the women wearing long veils which they change very cleverly for dry ones after their bath, and then wait in the sun till their garments are dry enough to carry away.
  • 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 aromatic polyimide membrane is highly permeable to water vapor but less permeable to vapors of organic compounds such as alcohol etc.

THREE:And, quite unexpectedly, as we turned a corner beyond the coppersmiths' alley, we came on a row of tea-shops, displaying huge and burly china jars. Chinamen, in black or blue, sat at the shop doors in wide, stiff armchairs, their fine, plaited pigtail hanging over the back, while they awaited a customer with a good-humoured expression of dull indifference.
  • 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.
THREE:

Acetone, ethanol, methyl ethyl ketone, butanol, isopropyl alcohol, ethyl acetate, methyl isobutyl ketone, others (including hexane and toluene).