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    Separation of olefin polymers
    1.
    发明授权
    Separation of olefin polymers 失效
    烯烃聚合物的分离

    公开(公告)号：US3816383A

    公开(公告)日：1974-06-11

    申请号：US24932872

    申请日：1972-05-01

    Applicant: NAT PETRO CHEM

    Inventor： STOTKO N

    IPC: C08F6/00 ,  B01J8/00 ,  B01J19/18 ,  C08F2/14 ,  C08F6/06 ,  C08F10/00 ,  C08F10/02 ,  C08F110/00 ,  C08F1/88 ,  C08F3/06

    CPC classification number: B01J19/1837 ,  B01J8/0055 ,  B01J19/1881 ,  C08F10/00 ,  C08F10/02 ,  C08F2/14

    Abstract: Process for the separation of olefin polymers from product slurries removed from a polymerization zone, in which the slurry is passed directly into a cyclone separator, a portion of the underflow from the separator being taken off for recovery of the solid polymer and the overflow therefrom being combined with the residual portion of the underflow and recycled to the polymerization reactor. A pressure differential is maintained between the take-off and recycle points in the polymerization reactor whereby to maintain continual fluid flow through the separator. Recycle of the diluent-rich overflow from the cyclone avoids blockage of the composite recycle stream.

    Preparation of silica gels
    3.
    发明授权
    Preparation of silica gels 失效

    公开(公告)号：US3794712A

    公开(公告)日：1974-02-26

    申请号：US3794712D

    申请日：1971-10-26

    Applicant: NAT PETRO CHEM

    Inventor： KIRCH W ,  ABOUTBOUL H ,  KREKELER J

    IPC: C01B33/154 ,  C01B33/16

    CPC classification number: C01B33/154 ,  C01B33/1543

    Abstract: SILICA GELS HAVING NARROW PORE DIAMETER DISTRIBUTION IN THE RANGE OF 300-600 A., SURFACE AREAS IN THE RANGE FROM 200-500 M.2/G., PORE VOLUMES OF FROM ABOUT 2.0 TO ABOUT 3.5 CM.3/G. AND THE PROCESS OF PREPARING SUCH SILICA GELS DIRECTLY FROM WATER, COMPRISING CRITICALLY CONTROLLED STEPS OF PRECIPITATION OF THE SILICA GEL, AGING THE PRECIPITATED SILICA HYDROGEL SLURRY, REDUCING THE ALKALINE IMPURITY LEVEL IN THE HYDROGEL BY WASHING THE AGED PRODUCT AND FREEZE DRYING THE HYDROGEL SO AS TO REMOVE SUBSTANTIALLY ALL OF THE WATER, I.E. VACUUM SUBLIMING THE WATER FROM THE GEL AFTER FREEZING SAID HYDROGEL PARTICLES AT A TEMPERATURE SUFFICIENT TO MAINTAIN THE WATER IN THE PORES IN THE FROZEN STATE.

    High shear mixing apparatus for making silica gels
    4.
    发明授权
    High shear mixing apparatus for making silica gels 失效
    用于制造二氧化硅凝胶的高剪切混合装置

    公开(公告)号：US3709664A

    公开(公告)日：1973-01-09

    申请号：US3709664D

    申请日：1970-08-14

    Applicant: NAT PETRO CHEM

    Inventor： KREKELER J ,  WEHR C ,  ABOUTBOUL H

    IPC: B01F7/18 ,  B01F15/06 ,  C01B33/154 ,  C01B33/16 ,  B01F7/20 ,  B01J1/04

    CPC classification number: B01F15/065 ,  B01F7/183 ,  C01B33/154 ,  Y10S516/93

    Abstract: Apparatus comprising a rotary agitator possessing movable sets of flat blades interspersed with stationary sets of flat blades, the pitch and clearances of the blades being such that high shear agitation is obtained. This apparatus is suitable for use in the carrying out of any process requiring high shear mixing. It has been found to be particularly useful in the preparation of silica gels of high quality.

    Abstract translation: 装置包括旋转搅拌器，该旋转搅拌器具有散布有固定组的平面叶片的可移动平板组，叶片的间距和间隙使得获得高剪切搅动。 该装置适用于进行需要高剪切混合的任何工艺。 已经发现在制备高质量硅胶的情况下特别有用。

    Preparation of silica gels
    5.
    发明授权
    Preparation of silica gels 失效

    公开(公告)号：US3819811A

    公开(公告)日：1974-06-25

    申请号：US23831372

    申请日：1972-03-27

    Applicant: NAT PETRO CHEM

    Inventor： ABOUTBOUL H ,  KREKELER J ,  KIRCH W

    IPC: B01J20/10 ,  B01J21/08 ,  B01J35/10 ,  C01B33/113 ,  C01B33/154 ,  C01B33/16

    CPC classification number: C01B33/16 ,  B01J20/103 ,  B01J21/08 ,  B01J35/10 ,  B01J35/1019 ,  B01J35/1047 ,  B01J35/1061 ,  B01J35/1085 ,  C01B33/113 ,  C01B33/154 ,  C01B33/1543

    Abstract: SILICA XEROGELS HAVING A NARROW PORE DIAMETER DISTRIBUTION IN THE RANGE OF 300-600A., SULFACE AREAS IN THE RANGE FROM 200 TO 500 M.2/G., AND PORE VOLUMES IN THE RANGE OF 2.0-3.5 CM.3/G. AND A PROCESS FOR PREPARING SUCH SILICA XEROGELS COMPRISING CRITICALLY CONTROLLED STEPS OF PRECIPITATION OF THE SILICA GEL, AGEING THE PRECIPITATED SILICA HYDROGEL SLURRY, WASHING THE AGED PRODUCT, AND REMOVING THE WATER FROM THE GEL WITH, WHERE NECESSARY, DURING THE GEL. THE WATER IS REMOVED IN SUCH A MANNER THAT THE SURFACE TENSION EXERTED UPON THE GEL, DURING DRYING, IS LESS THAN THAT SURFACE TENSION WHICH WOULD RESULT FROM THE DIRECT CONVERSION OF LIQUID WATER TO WATER VAPOR. TYPICAL TECHNIQUES WHICH MAY BE EMPLOYED ARE: (A) DISPLACING THE WATER IN GEL WITH AN ORGANIC LIQUID SUBSTANTIALLY COMPLETELY MISCIBLE WITH WATER AND THEN DRYING THE GEL; (B) VACUUM FREEZE-DRYING THE GEL; OR (C) ADDING A WATERIMMISCIBLE SOLVENT, WHICH FORMS AN AZEOTROPE WITH WATER WHEN DISTILLED, TO THE GEL, DISTILLING THE AZEOTROPE TO REMOVE SUBSTANTIALLY ALL OF THE WATER FROM HE GEL UNDER A SPECIFIC CONDITIONS AND DRYING THE GEL FROM ANY REMAINING SOLVENT.

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