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TWO:Chapter 12

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:But presently she stood up to go away, and her eyes caught the lowering, glazed ones of the Indian. Half involuntarily she made a motion of striking with a knife. Neither the doctor nor the steward caught it, but he did, and showed by a sudden start that he understood.
  • 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:Cairness tied his cow-pony to a post in front of a low calcimined adobe, and going across the patch of trodden earth knocked at the door. The little parson's own high voice called to him, and he went in.

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

THREE:The Reverend Taylor was about to go to the coops and close them for the night, when he saw a man and a woman on horseback coming up the street. The woman was bending forward and swaying in her saddle. He stood still and watched. The red sunset[Pg 250] blaze was in his face so that he could not see plainly until they were quite near. Then he knew that it was Cairness and—yes, beyond a doubt—Bill Lawton's runaway wife.He watched her as she went out of the tent, and the surgeon and steward worked with the shining little instruments.
  • 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:It was plain, even to Felipa, how thoroughly he enjoyed being with one who could talk of the past and of the present, from his own point of view. His Coventry had been almost complete since the day that the entire army, impersonated in Crook, had turned disapproving eyes upon him once, and had then looked away from him for good and all. It had been too bitter[Pg 310] a humiliation for him ever to subject himself to the chance of it again."Thank you," he said; and Cairness walked away.

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