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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:Off next morning to the Khyber Pass. The road lay across the vast monotonous plain, richly productive all the way from Peshawur to the foot of the hills. At one end of a field some men had spread a net and were beating the field towards the corners with a heavy rope that broke down the tall oats; before long the birds were seen struggling under the meshes, but they were soon caught and carried away in cages.
  • 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:Along the line were hedges of glaucous aloes, of[Pg 106] gynerium all plumed with white, and over every plant an inextricable tangle of baja, its pink flowers hanging in bunches.

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:A large building of red and white stone, with spacious arcades and a central dome, as vast as a cathedral, stands at the angle of two avenuesthe[Pg 6] railway terminus; and a great market of iron and glassCrawford Market. Here are mountains of fruit, greenery, and vegetables of every colour and every shade of lustre; and a flower garden divides the various market sheds, where little bronze coolies, in white, scarcely clad, sell oranges and limes.At a station where we stopped, a man with a broad, jolly, smiling face got into the carriage. He was a juggler and a magician, could do whatever he would, and at the time when the line was opened[Pg 90] he threatened that if he were not allowed to travel free he would break the trains into splinters. The officials had a panic, and the authorities were so nervous that they gave way; so he is always travelling from one station to another, living in the carriages.

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