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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.

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:"Good gracious, why shouldn't I! As for you,--ha!--I'd as soon turn a commissioned rebel officer loose in my camp unparoled as you."

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

THREE:
  • 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:"Three or four cormorants and a raft are necessary in this way of fishing. The cormorants are stupid-looking birds about the size of geese, but are of a dark color, so that they cannot be readily seen by the fish. The raft is of bamboo logs bound together, and about three feet wide by twenty[Pg 347] in length. The fisherman is armed with a paddle for propelling his raft and a scoop-net for taking the fish after they have been caught by the cormorant, and he has a large basket for holding the fish after they have been safely secured. Each cormorant has a cord or ring around his neck to prevent him from swallowing the fish he has taken, and it is so tight that he cannot get down any but the smallest fish.They found a large establishment, like a foundry, on the bank of the river, and just outside the thickly settled portion of the city. A tall chimney was smoking vigorously, and gave signs of activity; and there was an air of neatness about the surroundings quite in keeping with what they had observed thus far in their journey through Japan. They were met at the entrance by the director of the mint, a Japanese gentleman who had spent a considerable time in Europe and America, and spoke English with fluency and precision. They were invited to seats in the office, and, after a brief delay, were escorted through the establishment.

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