3.
    发明专利
    未知

    公开(公告)号:DE3412844A1

    公开(公告)日:1985-10-17

    申请号:DE3412844

    申请日:1984-04-05

    Applicant: HOECHST AG

    Abstract: Process for the removal of the residual sulfuric acid from the reaction mixture which has been obtained in the reaction of paraffin with sulfur dioxide, oxygen and water under irradiation by UV light and which has been freed from sulfur dioxide by degassing at an elevated temperature and from which the bulk of the sulfuric acid has been removed by concentration, by warming this concentrated product and adding as much of an alkali metal carbonate, peroxide, hydroxide, sulfate or sulfonate as is required to convert the residual sulfuric acid into an alkali metal bisulfate.

    4.
    发明专利
    未知

    公开(公告)号:DE3048059A1

    公开(公告)日:1982-07-29

    申请号:DE3048059

    申请日:1980-12-19

    Applicant: HOECHST AG

    Abstract: The invention relates to a process and device for the production of highly concentrated spinning solutions from acrylonitrile polymers, where the dissolving is carried out in one step in a stirred mixing vessel, which has a disc-shaped stirrer rotating in a horizontal plane, the polymeric material to be dissolved and the solvent are metered in separately at room temperature into the stirring vortex which is formed, and the temperature of the solution being formed is maintained at a constant preset value in the range from 60 DEG to 120 DEG C. by controlling the peripheral velocity of the stirrer.

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