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    Improvements in or relating to the recovery or separation of aromatic hydrocarbons
    54.
    发明专利
    Improvements in or relating to the recovery or separation of aromatic hydrocarbons 未知

    公开(公告)号：GB860842A

    公开(公告)日：1961-02-08

    申请号：GB3966059

    申请日：1959-11-23

    Applicant: STANDARD OIL CO

    Inventor： MCCAULAY DAVID A ,  LIEN ARTHUR P

    IPC: C07C7/156

    Abstract: Aromatic hydrocarbons are separated from non-aromatic hydrocarbons or different aromatic hydrocarbons by complex formation with hydrogen fluoride and a copper fluoride under anhydrous conditions. Aromatic hydrocarbons form the complex and non-aromatics do not; one molecule of cuprous fluoride complexes two hydrocarbon molecules while one molecule of cupric fluoride complexes one hydrocarbon molecule, and the complex dissolves in the hydrogen fluoride. In separating aromatics from non-aromatics preferably at least sufficient copper fluoride is used to complex all the aromatic hydrocarbon and 3-15 mols. of hydrogen fluoride are used per mol. of hydrocarbon (30-150 volume per cent based on hydrocarbon). Temperatures of -40 DEG to 150 DEG C. are used under sufficient pressure to maintain the liquid phase. The feed is preferably free of olefinic hydrocarbons and sulphur compounds. The resulting mixture may be distilled without separation; the non-aromatic hydrocarbons, possibly with hydrogen fluoride, are recovered first followed by the aromatic hydrocarbons and hydrogen fluoride at a higher temperature. Solid copper fluoride remains. The separation of ethylbenzene and xylenes may also be effected, several stages being necessary to effect complete separation. The "extract" phase containing the complex contains a higher proportion of xylenes and the "raffinate" a higher proportion of ethyl benzene. Cuprous fluoride is added in amounts of 0.1-0.6 mol. per mol. of xylene and cupric fluoride in amounts of 0.2-1.2 mol. per mol. Hydrogen fluoride is used in amounts of 3-30 mols. per mol. of aromatic hydrocarbon. Non-aromatic hydrocarbons may be present but olefinic and sulphur compounds are preferably excluded. In a multi-stage operation the "extract" phase may be contacted with a xylene "reflux". Continuous operation may be effected by passing the mixed feed and complexing agents to a distillation zone maintained at a temperature which will distil off the uncomplexed material while maintaining the hydrogen fluoride in a liquid condition, the complex being recovered at the base of the column.

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