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    Set for producing illuminated zones of extremely clean atmosphere
    1.
    发明授权
    Set for producing illuminated zones of extremely clean atmosphere 失效
    用于生产超清洁大气的照明区域

    公开(公告)号：US3806720A

    公开(公告)日：1974-04-23

    申请号：US33953073

    申请日：1973-03-09

    Applicant: HOECHST AG

    Inventor： HORTIG H

    IPC: A61G10/00 ,  A61G13/00 ,  F21S8/00 ,  F21V7/00 ,  F21V33/00

    CPC classification number: A61G13/108 ,  F21V7/0008 ,  F21V33/0088 ,  F21W2131/205

    Abstract: A set for producing illuminated zones of extremely clean atmosphere is provided. The set comprises a laminar flow unit and illuminating equipment consisting of a source of light and a deviating system for the light, the source of light being installed outside and the deviating system inside the zone of extremely clean atmosphere.

    Abstract translation: 提供了一套用于生产非常干净的气氛的照明区域。 该组件包括层流单元和由光源组成的照明设备和用于光的偏离系统，光源安装在外部，偏离系统位于非常干净的气氛区域内。

    4.
    发明专利
    未知

    公开(公告)号：BR7403648D0

    公开(公告)日：1974-12-24

    申请号：BR364874

    申请日：1974-05-06

    Applicant: HOECHST AG

    Inventor： SEIPP H ,  HORTIG H ,  GILLER H ,  ACHSEL E

    IPC: C07C69/82 ,  B01D9/02 ,  B01D11/00 ,  C07C67/06 ,  C07C69/08

    Abstract: Crude DMT containing, as impurities mainly dimethyl isophthalate, dimethyl orthophthalate and p-toluic acid methyl ester, is purified with the use of solvents known to be useful for the recrystallization of DMT in such a manner that the crude DMT in molten state is introduced with agitation into the solvent, the temperature of which is maintained above the temperature of that eutectic mixture of DMT and the main impurities associated therewith which has the highest melting point. As soon as the solvent is saturated with DMT, pure DMT crystallizes. The process is preferably carried out continuously and in a special vertical counter-current washing column.

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