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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:Away to the right was the Japanese part of Yokohama, while on the left was the foreign section. The latter included the row of buildings mentioned above; they stood on a level space which was only a few feet above the level of the bay. Back of this was a range of steep hills, which were covered nearly everywhere with a dense growth of trees and bushes, with little patches of gardens here and there. On the summits of the hills, and occasionally on their sides, were houses with wide verandas, and with great windows capable of affording liberal ventilation. Many of the merchants and other foreigners living in Yokohama had their residences in these houses, which were far more comfortable than the buildings near the water. Doctor Bronson explained that the lower part of Yokohama was called the "Bund," while the upper was known as the "Bluff." Business was transacted in the Bund, and many persons lived there; but the Bluff was the favorite place for a residence, and a great deal of money had been expended in beautifying it.
  • 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:"Where is she?"

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

THREE:"You are exactly right," was the reply."Nobody; some fall, you know, some plunge." I did not ask the cause of the plunge; the two little mules told me that. He would never have come, Gholson hurried on to say, had not Major Harper kindly suggested that a Sabbath spent with certain four ladies would be a timely preventive.
  • 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:"The typhoon blows in a circle, and may be briefly described as a rapidly revolving wind that has a diameter of from two to five hundred miles. It is a whirlwind on a large scale, and as furious as it is large. A curious fact about it is that it has a calm centre, where there is absolutely no wind at all, and this centre is sometimes forty or fifty miles across. Nearest the centre the wind has the greatest violence, and the farther you can get from it, the less severe is the gale. Mariners always try to sail away from the centre of a typhoon, and I have known a ship to turn at right angles from her course in order to get as far as possible from the centre of a coming tempest. There is a great difference of opinion among captains concerning these storms, some declaring that they have been in the middle point of a typhoon and escaped safely, while others aver that no ship that was ever built can withstand the fury of a storm centre. But I think the weight of evidence is in favor of the former rather than the latter, as I have known captains who have described their situation in such a way as to leave not the slightest doubt in my mind of the correctness of their statements.His face suddenly cleared, and all trace of the canine resemblance vanished as if by magic. He got up and took two or three jerk-like strides up and down the room. "Must keep goingwhen I feel like thiseither food or violent stimulusotherwise the confounded thing runs downand there you are."

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