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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.

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  • 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:Whilst the French armies had been carrying bloodshed and misery into the countries around them, their brethren at home had been equally[436] busy in pushing forward those mutual hatreds which appeared likely to end in the extermination of the whole race of revolutionists. The Girondists being destroyed, new divisions showed themselves in those who had hitherto been alliesRobespierre and his coadjutors. Hbert, Chaumette, Clootz, Ronsin, and others, began to raise their heels against their chief, and their chief doomed every one of them to the guillotine. His most important victim was Danton, a man by no means contemptible (guillotined April 5th, 1794).

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

THREE:Sandy, watching his friends face take on an eager light, a look of longing, decided that Mr. Whiteside could not have found a more certain way to fascinate Larry and enlist his cooperation.
  • 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:In less than an hour the troop was ready, the men flannel-shirted and gauntleted, their soft felt hats pulled over their eyes, standing reins in hand, foot in stirrup, beside the fine, big horses that Crook had substituted for the broncos of the plains cavalry of former years. Down by the corrals the pack-mules were ready, too, grunting under their aparejos and packs. A thick, hot wind, fraught with sand, was beginning, presaging one of the fearful dust storms of the southwest. The air dried the very blood in the veins. The flies, sticky and insistent, clung and buzzed about the horses' eyes and nostrils. Bunches of tumbleweed and hay went whirling across the parade."I think perhaps I'll go with you, if you'll wait over a day," Cairness told him. He had taken a distinct[Pg 38] fancy to the little botanist who wore his clerical garb while he rode a bronco and drove a pack-mule over the plains and mountains, and who had no fear of the Apache nor of the equally dangerous cow-boy. Cairness asked him further about the hat. "That chimney-pot of yours," he said, "don't you find it rather uncomfortable? It is hot, and it doesn't protect you. Why do you wear it?"

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