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TWO:[See larger version]

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:With the Elizabeth the Young Pretender lost the greater part of his arms and ammunition. Yet he would not return, but set out in the Doutelle towards Scotland. In two days more the little vessel was pursued by another large English ship, but by dint of superior sailing they escaped, and made the Western Isles. It was only after a fortnight's voyage, however, that they came to anchor off the little islet of Erisca, between Barra and South Uist.246
  • 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:"I wish Brewster would not come so often," he said.[See larger version]

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

THREE:"They put him in a tent beside the hospital, and the next morning I went over with the doctor to see him. He was all cut up on the arms and neck and shoulders. I must have been very strong." She stopped, and he still sat with the puzzled look on his face, but a light of understanding beginning to show through.SURRENDER OF BAILLIE TO HYDER ALI. (See p. 330.)
  • 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).