中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

74 records (took 0.02 seconds)

    27.
    发明专利
    未知

    公开(公告)号：DE58901691D1

    公开(公告)日：1992-07-23

    申请号：DE58901691

    申请日：1989-09-04

    Applicant: DEGUSSA

    Inventor： PAULI INGO DR ,  KLEINSCHMIT PETER DR ,  SCHWARZ RUDOLF DR

    IPC: B01J21/04 ,  C01F7/02 ,  C01F7/30 ,  C09K3/14

    Abstract: Aluminium oxide which is amorphous according to X-ray diffraction, has an extremely high water content and has a specific surface area (BET) in accordance with DIN 66 131 of > 10 m /g, a mean particle size of >/= 0.1 mu m and a water content of > 10% gives, through calcination, an aluminium oxide which comprises >/= 90% by weight of alpha -aluminium oxide and has a specific surface area (BET) in accordance with DIN 66 131 of > 5 m /g and a mean particle size of >/= 0.1 mu m. … The aluminium oxide which is amorphous according to X-ray diffraction can be prepared by reacting steam and vapour-form aluminium trichloride in a molar ratio of 1.5 to 10:1, preferably 7 +/- 1 : 1 = H2O : AlCl3 at a temperature of 200 to 1000 DEG C, preferably 600 +/- 50 DEG C, and at a resonance time of > 1 second, preferably 3.5 +/- 1 second, and at a pressure of 100 +/- 10 mm water column.

    Pptd. silica prodn. by hydrolysis of silicon tetra:chloride - by dropwise addn. of water or silicon tetra:chloride to other reactant which is mixed or dissolved in organic solvent
    30.
    发明专利
    Pptd. silica prodn. by hydrolysis of silicon tetra:chloride - by dropwise addn. of water or silicon tetra:chloride to other reactant which is mixed or dissolved in organic solvent 未知

    公开(公告)号：DE3937394A1

    公开(公告)日：1990-05-23

    申请号：DE3937394

    申请日：1989-11-10

    Applicant: DEGUSSA

    Inventor： PAULI INGO DR ,  KLEINSCHMIT PETER DR ,  SCHWARZ RUDOLF DR

    IPC: C01B33/18

    Abstract: Silicic acids (I) are produced by hydrolysis of SiCl4 (II) with water in the presence of an organic solvent system (III), the novelty is that either (II) or the water is added dropwise, in pure form, to the other reactant (water or (II)) which is in the form of a mixt. or in soln. with (III). (III) is e.g. hydrocarbon, ether (e.g. THF), EtOAc, CHCl3, acetone, silicone oil, AcOH etc. or a mixt. thereof, pref. (II) is added to the aq. phase (esp. at 0-10 deg.C for prodn. of spherical (I)). USE/ADVANTAGE - The process enables the prodn. of hydrophobic pptd. silica in one step (if the solvent contains a siloxane or a silicone oil), with BET surface and particle size distribution tailored to requirements (by adjusting the process conditions), the prod. is pref. obtd. as compact 20-100 micron spheres, useful e.g. as a catalyst support, foam suppressant, matting agent, silicone rubber filler, etc.

Patent Agency Ranking