21.
    发明专利
    未知

    公开(公告)号:DE10006900A1

    公开(公告)日:2001-08-23

    申请号:DE10006900

    申请日:2000-02-16

    Abstract: The invention relates to a method for polymerizing or copolymerizing ethylenically unsaturated monomers in the presence of radically decomposing polymerization initiators in a continuously operating polymerization device. Said polymerization device is composed of a fresh gas supply, a pre-compressor, a post-compressor, a reactor, a pressure maintaining valve, of a high-pressure circuit, which is provided with a high-pressure product separator and with a high-pressure circuit gas return, and of a product valve and a low-pressure circuit, which is provided with a low-pressure product separator and with a low-pressure circuit gas return. The inventive method is characterized in that nitrogen monoxide or oxygen is added in a dosed manner as an inhibitor into the high-pressure circuit, into the low-pressure circuit and/or into the pre-compressor.

    Method for the continuous recovery of styrene from a mixture containing same

    公开(公告)号:AU3806900A

    公开(公告)日:2000-09-14

    申请号:AU3806900

    申请日:2000-02-25

    Applicant: BASF AG

    Abstract: The invention relates to a method for the continuous recovery of styrene from a mixture containing same, by distillation of the mixture in a cascade of n distillation columns. According to said method, (i) an inflow containing a stabilizer system is fed into the first column and/or is placed into at least one of the distillation columns positioned upstream of the nth distillation column, whereby said stabilizer system comprises N-oxyl radicals; (ii) in the bottom of the nth distillation column a high-boiling fraction containing the stabilizer system and boiling at a higher temperature than styrene is concentrated; (iii) a partial flow of the high-boiling fraction is recycled and placed into at least one distillation column positioned upstream of the nth distillation column; and (iv) the remainder of the high-boiling fraction is withdrawn from the process.

    CONTINUOUS RECOVERY OF STYRENE FROM A STYRENE-CONTAINING MIXTURE

    公开(公告)号:CA2364265A1

    公开(公告)日:2000-08-31

    申请号:CA2364265

    申请日:2000-02-25

    Applicant: BASF AG

    Abstract: The invention relates to a method for the continuous recovery of styrene fro m a mixture containing same, by distillation of the mixture in a cascade of n distillation columns. According to said method, (i) an inflow containing a stabilizer system is fed into the first column and/or is placed into at leas t one of the distillation columns positioned upstream of the nth distillation column, whereby said stabilizer system comprises N-oxyl radicals; (ii) in th e bottom of the nth distillation column a high-boiling fraction containing the stabilizer system and boiling at a higher temperature than styrene is concentrated; (iii) a partial flow of the high-boiling fraction is recycled and placed into at least one distillation column positioned upstream of the nth distillation column; and (iv) the remainder of the high-boiling fraction is withdrawn from the process.

    28.
    发明专利
    未知

    公开(公告)号:DE19859391A1

    公开(公告)日:2000-06-29

    申请号:DE19859391

    申请日:1998-12-22

    Applicant: BASF AG

    Abstract: A process for the compression of ethylenically unsaturated monomers at a pressure of 200-5,000 bar in the absence of a polymerization initiator is carried out in the presence of a nitroxyl compound (I). A process for the condensation of ethylenically unsaturated monomers at a pressure of 200-5,000 bar in the absence of a polymerization initiator is carried out in the presence of a nitroxyl compound of formula (I). Independent claims are included for: (i) a process for the production of copolymers by condensation of the comonomer, optionally as a mixture in the presence of (I) followed by polymerization at 50-350 degrees C by addition of a polymerization initiator; (ii) the resulting copolymer product. R , R = 1-4C alkyl or R and R together with the C atom they are bonded to form a 5 or 6 C saturated hydrocarbon ring; R = 1-4C alkyl; R = H or 1-12C alkyl.

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