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    12.
    发明专利
    未知

    公开(公告)号：ES2216902T3

    公开(公告)日：2004-11-01

    申请号：ES00938781

    申请日：2000-06-09

    Applicant: BASF AG

    Inventor： SUTORIS HEINZ FRIEDRICH ,  MITULLA KONRAD

    IPC: B01J19/00 ,  C07B63/04 ,  C07C7/05 ,  C07C7/20 ,  C07C15/46 ,  C08F2/38 ,  C08F2/40 ,  C08F12/00

    Abstract: A process for preventing undesired polymerization is conducted by maintaining an effective concentration of a stabilizer which comprises N-oxyl radicals in a mixture containing ethylenically unsaturated compounds, wherein(i) an electronic signal which correlates with the concentration of the N-oxyl radicals in the mixture is obtained periodically or continuously,(ii) the electronic signal is compared with a reference value, and(iii) addition of a stabilizer to the mixture is controlled according to the comparison (ii).The signal is preferably obtained by ESR measurement. The process permits efficient use of the stabilizer.

    13.
    发明专利
    未知

    公开(公告)号：DE50005600D1

    公开(公告)日：2004-04-15

    申请号：DE50005600

    申请日：2000-06-09

    Applicant: BASF AG

    Inventor： SUTORIS FRIEDRICH ,  MITULLA KONRAD

    IPC: B01J19/00 ,  C07B63/04 ,  C07C7/05 ,  C07C7/20 ,  C07C15/46 ,  C08F2/38 ,  C08F2/40 ,  C08F12/00

    Abstract: A process for preventing undesired polymerization is conducted by maintaining an effective concentration of a stabilizer which comprises N-oxyl radicals in a mixture containing ethylenically unsaturated compounds, wherein(i) an electronic signal which correlates with the concentration of the N-oxyl radicals in the mixture is obtained periodically or continuously,(ii) the electronic signal is compared with a reference value, and(iii) addition of a stabilizer to the mixture is controlled according to the comparison (ii).The signal is preferably obtained by ESR measurement. The process permits efficient use of the stabilizer.

    14.
    发明专利
    未知

    公开(公告)号：AT249407T

    公开(公告)日：2003-09-15

    申请号：AT00916873

    申请日：2000-02-25

    Applicant: BASF AG

    Inventor： MITULLA KONRAD ,  SUTORIS HEINZ FRIEDRICH

    IPC: B01D3/32 ,  C07B63/04 ,  C07C7/05 ,  C07C7/20 ,  C07C15/46

    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.

    15.
    发明专利
    未知

    公开(公告)号：ES2171659T3

    公开(公告)日：2002-09-16

    申请号：ES96908047

    申请日：1996-03-15

    Applicant: BASF AG

    Inventor： KOCH ANDREAS ,  AUMULLER ALEXANDER ,  MITULLA KONRAD ,  TREMMEL GREGOR ,  HERBST HOLGER

    IPC: C07D211/58 ,  C07B63/04 ,  C07D211/94 ,  C07F9/59 ,  C09K15/22 ,  C09K15/30

    Abstract: PCT No. PCT/EP96/01122 Sec. 371 Date Sep. 22, 1997 Sec. 102(e) Date Sep. 22, 1997 PCT Filed Mar. 15, 1996 PCT Pub. No. WO96/29311 PCT Pub. Date Sep. 26, 19964-Acylaminopiperidine N-oxides IaA1B1(Ia)where A1 is hydrogen or an organic radical and B1 is a radical IIa where R1-R4 are each C1-C4-alkyl and R1 and R2, on the one hand, and R3 and R4, on the other hand, may furthermore be bonded to form a 5-membered or 6-membered ring, R5 is H or C114 C4-alkyl and R6 is H or C1-C18-alkyl, are used for stabilizing organic materials against the harmful effect of free radicals, particularly in the distillation of monomers which undergo free radical polymerization, especially styrene.

    16.
    发明专利
    未知

    公开(公告)号：DE19926758A1

    公开(公告)日：2000-12-14

    申请号：DE19926758

    申请日：1999-06-11

    Applicant: BASF AG

    Inventor： SUTORIS HEINZ FRIEDRICH ,  MITULLA KONRAD

    IPC: B01J19/00 ,  C07B63/04 ,  C07C7/05 ,  C07C7/20 ,  C07C15/46 ,  C08F2/38 ,  C08F2/40 ,  C08F12/00 ,  C09K15/20 ,  C09K15/30 ,  B01D3/42 ,  B01D3/34

    Abstract: The invention relates to a method for preventing undesired polymerisation in a mixture of substances containing ethylenically unsaturated compounds, by maintaining an active concentration of a stabiliser system which contains N-oxyl radicals. According to said method, (i) an electronic signal is obtained periodically or continuously which is in correlation with the concentration of the N-oxyl radicals (ii) the electronic signal is compared with a default value and (iii) the addition of the stabiliser system is controlled, in accordance with this comparison. The signal is preferably obtained by an ESR measurement. The method permits the effective use of the stabiliser system.

    MIXTURE OF SUBSTANCES CONTAINING COMPOUNDS OF VINYL GROUPS AND STABILIZERS
    17.
    发明专利
    MIXTURE OF SUBSTANCES CONTAINING COMPOUNDS OF VINYL GROUPS AND STABILIZERS 未知

    公开(公告)号：BG103970A

    公开(公告)日：2000-11-30

    申请号：BG10397099

    申请日：1999-12-08

    Applicant: BASF AG

    Inventor： SUTORIS HEINZ F ,  MITULLA KONRAD ,  DUPUIS JACQUES ,  KALIBA CLAUS

    IPC: C07B63/04 ,  C07C7/20 ,  C07C15/46 ,  C09K15/20 ,  C09K15/30 ,  C09K15/32

    Abstract: The invention relates to a mixture of substances including one or more compounds with vinyl groups as component (A), and as component (B) - stabilizer containing one or more easily volatile nitroxyl compounds as component (b1), one or more not easily volatile nitroxyl compounds as component (b2), optionally one or more aromatic nitrocompounds as component (b3), optionally one or more iron compounds as component (b4). The invention also relates to stabilizers (B) containing the components (b1) & (b2), (b1), (b2) and (b3), (b1) (B2), (b4) and (b1),(b2), (b3) and (b4), and to a method for the inhibition of the premature polymerization of compounds containing vinyl groups during their refining or distillation by the addition of either stabilizer (B) or components from it as individual substances or at least as two groups of components. 10 claims

    MIXTURE CONTAINING VINYL COMPOUNDS AND STABILISING AGENTS
    18.
    发明专利
    MIXTURE CONTAINING VINYL COMPOUNDS AND STABILISING AGENTS 未知

    公开(公告)号：PL337673A1

    公开(公告)日：2000-08-28

    申请号：PL33767398

    申请日：1998-06-04

    Applicant: BASF AG

    Inventor： SUTORIS HEINZ FRIEDRICH ,  MITULLA KONRAD ,  DUPUIS JACQUES ,  KALIBA CLAUS

    IPC: C07B63/04 ,  C07C7/20 ,  C07C15/46 ,  C09K15/20 ,  C09K15/30 ,  C09K15/32

    Abstract: A mixture contains one or more vinyl-containing compounds as component (A) and, as a further component, a stabilizer (B) which contains one or more readily volatile nitroxyl compounds as component (b1), one or more sparingly volatile nitroxyl compounds as component (b2), if required one or more aromatic nitro compounds as component (b3) and, if required, one or more iron compounds as component (b4).Stabilizers (B) contain the components (b1) and (b2), (b1) and (b2) and (b3), (b1) and (b2) and (b4), and (b1), (b2), (b3) and (b4), and the premature polymerization of vinyl-containing compounds during their purification or distillation is inhibited by a process in which a stabilizer (B) is added or the components of stabilizer (B) are added as individual substances or in at least two groups of the components.

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