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TWO:[Pg 20]

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:Cairness stood up, ran his hands into his pockets, and going over to the window looked down at the geraniums as he had done once, long before.
  • 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:Kirby set down his gun and turned to his wife, holding out his arms. She went to him and he kissed her on the forehead and the lips, in farewell. "Good-by," he said; "now take the children in there."Cairness smiled. There was, it appeared, a small supply of poetic justice still left in the scheme of things to be meted out. "And then the Apache came down and bore you off like a helpless lamb," he said. "If I'd been the Apache I'd have made it several sorts of Hades for you, but I'd have scalped you afterward. You'd corrupt even a Chiricahua squaw. However, I'm glad you lived until I got you." And he left her.

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

THREE:Felipa turned from them and waited, clasping her hands and smiling up at Brewster. He, misinterpreting, felt encouraged and begged her to leave the disgusting insects. He had something very different to talk about. She said that she did not want to hear it, and would he bet on the tarantula or the vinagrone?
  • 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:"And now," said the Reverend Taylor, fingering the lock of hair over the little Reverend's right ear,[Pg 263] as that wise little owl considered with uncertain approval a whistle rattle Cairness had bought for him, "and now what are you going to do?"

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