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TWO:In 1808 and 1809 Mme. Le Brun travelled in Switzerland, with which she was enraptured; after which she bought a country house at Louveciennes, [155] where in future she passed the greater part of the year, only spending the winter in Paris.

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:David turned pale, made his escape, and for a long time would not go to the house for fear of meeting her. [49] She was afterwards told by Gros that David would like to go and see her, but her silence expressed her refusal. Soon after the return of Mme. Le Brun, Napoleon sent M. Denon to order from her the portrait of his sister, Caroline Murat. She did not like to refuse, although the price given (1,800 francs) was less than half what she usually got, and Caroline Murat was so insufferable that it made the process a penance. She appeared with two maids, whom she wanted to do her hair while she was being painted. On being told that this was impossible, she consented to dismiss them, but she kept Mme. Le Brun at Paris all the summer by her intolerable behaviour. She was always changing her dress or coiffure, which had to be painted out and done over again. She was never punctual, and often did not come at all, when she had made the appointment; she was continually wanting alterations and giving so much trouble, that one day Mme. Le Brun remarked to M. Denon, loudly enough for her to hear
  • 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:

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

THREE:[333]
  • 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).