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    4.
    发明专利
    未知

    公开(公告)号：DE1545491B1

    公开(公告)日：1969-09-18

    申请号：DE1545491

    申请日：1960-04-21

    Applicant: ETHYL CORP

    Inventor： ELDON COOK SHIRL ,  OLLOISE SISTRUNK THOMAS

    IPC: C07F7/24 ,  C10L1/14 ,  C10L1/16 ,  C10L1/20 ,  C10L1/30

    Abstract: An anti-knock concentrate comprises tetramethyllead and a hydrocarbon liquid having a boiling point at atmospheric pressure in the range of from 90 DEG to 150 DEG C. and selected from alkanes and mononuclear aromatics containing only aromatic unsaturation, especially toluene.ALSO:Tetramethyllead may be prepared by reacting a sodium-lead alloy and methyl chloride in the presence of a catalyst and a hydrocarbon liquid inert to the reactants under the reaction conditions. The catalysts specified include aluminium chloride, bromide and iodide, an alkyl compound of a Group II or III metal for example, dimethyl beryllium, diethyl zinc, triethyl gallium, triethyl aluminium, trimethyl aluminium, methyl aluminium sesquichloride or dimethyl aluminium chloride, a complex alumino hydride, an alkyl boron compound or phosphorus or arsenic. The hydrocarbon liquid has a boiling point between 90 DEG and 150 DEG C., and is preferably toluene. It is used in amount not greater than 25 parts by weight per 100 parts of lead in the alloy charged, and less than 50% by volume of the methyl chloride used. The methyl chloride is used in at least 5% excess, and there should also be sufficient methyl chloride present in addition to fill the reaction system with vapour. The amount of lead is 20-60 lbs. of lead per cubic foot of reaction zone space. The process may be carried out batchwise or continuously.

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