Patents Assigned to Rhodia Acetow Brasil LTDA
  • Use of surface-active agents in the impurity removal process from solutions containing acetic derivatives using nano-filtration with membranes, in a process to obtain cellulose acetate
    Patent number: 6673245
    Abstract: This invention refers to the use of surface-active agents as a treatment of effluents containing acetic derivatives by tangential filtration characterized from aqueous solutions containing between 20 and 35% in weight of acetic derivatives having been optionally decanted and filtered in a conventional manner in order to remove suspended impurities, which undergo the addition of one or more surface-active agents, while submitted to the tangential filtration process via polymer membranes, the cutting range of which may vary between 0.001 and 0.
    Type: Grant
    Filed: January 17, 2002
    Date of Patent: January 6, 2004
    Assignee: Rhodia Acetow Brasil LTDA
    Inventors: Roberto Nasser, Jr., Aires Iacovone
  • Use of surface-active agents in the impurity removal process from solutions containing acetic derivatives using nano-filtration with membrances, in a process to obtain cellulose acetate
    Publication number: 20020148768
    Abstract: This invention refers to the use of surface-active agents as a treatment of effluents containing acetic derivatives by tangential filtration characterized from aqueous solutions containing between 20 and 35% in weight of acetic derivatives having been optionally decanted and filtered in a conventional manner in order to remove suspended impurities, which undergo the addition of one or more surface-active agents, while submitted to the tangential filtration process via polymer membranes, the cutting range of which may vary between 0.001 and 0.
    Type: Application
    Filed: January 17, 2002
    Publication date: October 17, 2002
    Applicant: RHODIA ACETOW BRASIL LTDA
    Inventors: Roberto Nasser, Aires Iacovone