26.
    发明专利
    未知

    公开(公告)号:ES2048490T3

    公开(公告)日:1994-03-16

    申请号:ES90907000

    申请日:1990-05-05

    Abstract: In a process for manufacturing gas-tight aluminium tubes suitable for carrying out catalytic high-temperature reactions, powdered aluminium oxide is mixed with water, a binder and a plasticizer, and the mixture is deformed by drawing a hank into a cylindrical green body, which is then deformed in at least two places so that the circular cross-section of the tube becomes approximately ellipsoidal. The deformed green body is dried and sintered at 1740C. Excellent mixing of the gas in the tube is achieved as a result of the constrictions in the cross-section.

    29.
    发明专利
    未知

    公开(公告)号:NO892640L

    公开(公告)日:1990-02-05

    申请号:NO892640

    申请日:1989-06-26

    Applicant: DEGUSSA

    Abstract: Bitumen granules which contain 0.5 to 6 % by weight of a powdering and separating agent such as, for example, synthetic silica or carbon black, is produced by atomising hot liquid bitumen in a known spray mixer and simultaneously introducing the powdering and separating agent via the cold air stream into the spray mixer.

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