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103 records (took 0.024 seconds)

    32.
    发明专利
    未知

    公开(公告)号：ES2194355T3

    公开(公告)日：2003-11-16

    申请号：ES98951436

    申请日：1998-09-18

    Applicant: BASF AG

    Inventor： BAUMANN DIETER ,  PUTTER HERMANN ,  HANNEBAUM HEINZ

    IPC: C07D307/88 ,  C25B3/25

    Abstract: Phthalides in as-obtained phthalide synthesis reaction mixtures are recovered in pure form by(a) distilling compounds having a boiling point below the boiling point of the phthalide from the reaction mixture, provided such compounds are present in the reaction mixture, to obtain a crude phthalide as bottom product,(b) crystallizing the phthalide from a melt of the crude phthalide.

    Purification process of raw acrylic acid melts
    34.
    发明专利
    Purification process of raw acrylic acid melts 未知

    公开(公告)号：CZ20023376A3

    公开(公告)日：2003-05-14

    申请号：CZ20023376

    申请日：2001-04-04

    Applicant: BASF AG

    Inventor： ECK BERND ,  BAUMANN DIETER ,  HEILEK JORG ,  MULLER-ENGEL KLAUS JOACHIM

    IPC: C07C51/43 ,  C07C51/47 ,  C07C57/07

    Abstract: In a process for the purification of a crude acrylic acid melt, the crude acrylic acid melt is converted, under the action of low temperatures, into a crude acrylic acid suspension consisting of acrylic acid crystals and residual melt, and the acrylic acid crystals of the crude acrylic acid suspension are freed from remaining residual melt in a wash column, the production of the acrylic acid crystals of the crude acrylic acid suspension being carried out in the presence of water, the wash column being a wash column with forced transport of the acrylic acid crystals and the wash liquid used being the melt of acrylic acid crystals purified in the wash column.

    39.
    发明专利
    未知

    公开(公告)号：AT202075T

    公开(公告)日：2001-06-15

    申请号：AT97119147

    申请日：1997-11-03

    Applicant: BASF AG

    Inventor： SCHOENHERR MICHAEL DR ,  RAULS MATTHIAS DR ,  ASCHERL HERMANN ,  LETZELTER THOMAS ,  BAUMANN DIETER ,  POTTHOFF-KARL BIRGIT DR

    IPC: C11D1/04 ,  C07C227/42 ,  C07C229/16 ,  C07C229/24

    Abstract: A method for the preparation of a crystalline solid comprising a glycine-N,N-diacetic acid derivative of formula (I) with a very low hygroscopicity, comprises fixing the water content of the starting material containing (I) at 10-30 wt.% and then carrying out crystallisation: MOOC-CH(R)-N(CH2COOM)2 (I) R = 1-30C alkyl or 2-30C alkenyl (both optionally containing 1-5 OH, formyl, 1-4C alkoxy(carbonyl) or phenoxy groups and/or optionally containing up to 5 non-adjacent O atoms in the chain), alkoxylate groups of formula (II), phenyl-(1-20 C)-alkyl (optionally containing up to 3 1-4C alkyl, OH, carboxyl, sulpho or 1-4C alkoxycarbonyl ring substituents), 5- or 6-membered optionally benzalated heterocyclic ring containing up to 3 N, O or S atoms (optionally containing up to 3 1-4C alkyl, OH, carboxyl, sulpho or 1-4C alkoxycarbonyl substituents) or a group of formula (III): -(CH2)k-O-(A O)m-(A O)n-Y (II) -A-CH(COOM)-N(CH2COOM)2 (III) A , A = 2-4C 1,2-alkylene; Y = H, 1-12C alkyl, phenyl or 1-4C alkoxycarbonyl; k = 1-3; m, n = 0-50; A = 1-12C alkylene or single bond; and M = H, alkali(ne earth) metal or optionally substituted ammonium, with the provision that m+n = at least 4.

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