ここから本文です
TWO:CHAPTER IX. SHORTY IN TROUBLE

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:
  • 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:"Never do in the world," said she, "to trust them skittish young horses, what hain't done a lick o' work since Pap went away, to that stoopid darky. They'd surely run away and break his neck, which 'd be no great loss, and save lots o' provisions, but they'd smash that new wagon and break their own necks, which are worth more'n 0 apiece.""My parole was out at daylight," he said, as they came up. "The sun's now nearly an hour high. I ain't obleeged to be good no more, and I could' 've drapped one o' yo'uns when y' fust turned offen the road, and got away. I s'pose I'd orter've done hit, and I'd a great mind ter, but suthin' sorter held me back. Onderstand that?"

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

THREE:"No," answered the Lieutenant. "This is the place where we intended to get off. We were quietly getting out so as to attract no notice when you started your circus. I saw you were doing well, hiving those fellows together, so I let you go ahead, while I slipped the boys around to gather them all in. Pretty neat job for a starter, wasn't it?"
  • 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).