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    12.
    发明专利
    未知

    公开(公告)号：DE1208494B

    公开(公告)日：1966-01-05

    申请号：DEB0063794

    申请日：1961-08-26

    Applicant: BASF AG

    Inventor： EILBRACHT DR HANS ,  ROTZOLL DR RUDI-HEINZ ,  TRIESCHMANN DR HANS-GEORG ,  URBAN DR FRIEDRICH

    IPC: C07C7/11 ,  C08F10/00

    Abstract: Recycle ethylene in the high pressure polymerization of ethylene is purified by washing at least 25% of the ethylene, after any polyethylene having a molecular weight of more than 20,000 has been separated, with liquid ethylene at below 50.9 atmospheres. After the polythylene has been separated, a portion, e.g. 5-20%, of the recycle ethylene may be liquefied and the remainder of the recycle ethylene is washed with the liquefied ethylene. The washing may be carried out in a wash column with the liquid ethylene in counter-current to the gas at 25-40 atmospheres and -25 to 0 DEG C. The polyethylene may be used to form sheets.ALSO:Recycle ethylene in the high pressure polymerization of ethylene is purified by washing at least 25% of the ethylene, after any polyethylene having a molecular weight of more than 20,000 has been separated, with liquid ethylene at below 50.9 atm. After the polyethylene has been separated, a portion, e.g. 5-20% of the recycle ethylene may be liquefied and the remainder of the recycle ethylene is washed with the liquefied ethylene. The washing may be carried out in a wash column with the liquid ethylene in counter current to the gas at 25-40 atm. and - 25 DEG to 0 DEG C. The polyethylene may be used to form sheets.

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