42.
    发明专利
    未知

    公开(公告)号:NO158516C

    公开(公告)日:1988-09-21

    申请号:NO820684

    申请日:1982-03-04

    Applicant: BASF AG

    Inventor: WISSEROTH KARL

    Abstract: A process for gaining access to the coal of very deep seams, and for extracting this coal with the aid of a conveying liquid, which is fed to the seams via boreholes and is thence brought back again to the surface with coal which has been detached, wherein agents for detaching and breaking up the coal are admixed to the liquid.

    Purification of olefines
    47.
    发明专利

    公开(公告)号:GB1006939A

    公开(公告)日:1965-10-06

    申请号:GB2774162

    申请日:1962-07-19

    Applicant: BASF AG

    Abstract: Ethylene, propylene, butene (1) or mixtures thereof are purified prior to polymerization by passage over beds of alumina or iron oxide at such a temperature in the range 50-200 DEG C. that between 0.0001 and 1% by weight is polymerized. The olefine may be passed from the top to the bottom of towers containing the catalyst, thus enabling the polymerized product and purified olefine to be separated at the bottom. The purified olefine may be partially recycled through the bed. Operating pressures of 1-300 atmospheres absolute are specified.

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