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Process for obtaining a ccellulosic wet sheet and a membrane, the equipment used to obtain the membrane and the membrane obtained

  • US 20060134758A1
  • Filed: 11/26/2003
  • Published: 06/22/2006
  • Est. Priority Date: 12/05/2002
  • Status: Abandoned Application
First Claim
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1. “

  • Process used to obtain cellulosic wet sheet”

    characterized by the following steps;

    a) heating a solution containing 0.2 to 12% of glucose mass and 0.1 to 7% of yeast extract in water that was filtered through sand and activated charcoal, in a sanitary stainless steel mixer with a steam heated jacket, at a temperature of 125°

    C. for 15 minutes, for sterilization purposes;

    b) cooling the solution till it reaches a temperature between 5 and 30°

    C.;

    c) adding 0.5 to 5% of ethanol and of 2 to 50% of the inoculum Acetobacter xylinum, followed by agitation of the solution until it is homogenized;

    d) transferring the solution to covered fermentation trays where it must rest for 16 to 240 hours, at a temperature between 5 and 30°

    C.;

    e) collecting the cellulose wet sheets that are thus formed, varying from 0.25 to 200 mm in thickness;

    f) forwarding the wet sheets to the whirlpool tank, where they are purified and whitened, according to the following sequence;

    rinsing, washing with sodium hydroxide 1 to 5%, rinsing, washing with 1 to 5% sodium lauryl sulfate and final rinsing;

    g). packaging the wet sheets for shipping.

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