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    4.
    发明专利
    未知

    公开(公告)号：DE19627847A1

    公开(公告)日：1998-01-15

    申请号：DE19627847

    申请日：1996-07-10

    Applicant: BASF AG

    Inventor： ECK BERND ,  MACHHAMMER OTTO DR ,  PROLL THEO DR ,  SCHLIEPHAKE VOLKER DR

    IPC: C07C57/04 ,  C07C51/21 ,  C07C51/43 ,  C07C57/05 ,  C07C57/07

    Abstract: Disclosed is a method of preparing acrylic acid or methacrylic acid by: (a) preparing a gaseous product mixture having essentially the composition of a reaction mixture of catalytic gas-phase oxidation of C3/C4 alkanes, alkenes, alkanols and/or alkanals and/or precursors thereof to form acrylic acid or methacrylic acid, characterized by (b) condensation of the product mixture, (c) crystallization of the acrylic acid or methacrylic acid from the solution obtained in stage (b), and (d) extraction of the resulting crystals from the mother liquor.

    5.
    发明专利
    未知

    公开(公告)号：AT119064T

    公开(公告)日：1995-03-15

    申请号：AT91104120

    申请日：1991-03-16

    Applicant: BASF AG

    Inventor： HABERMANN WOLFGANG ,  BOCHNITSCHEK WERNER DR ,  FRITZMANN JOHANN DR ,  HAMMES PETER DR ,  PROLL THEO DR ,  WEISBRODT WALTER DR

    IPC: C25B1/16 ,  B01D61/44 ,  B01D61/52 ,  C25B1/10 ,  C25B1/22 ,  C25B13/04

    Abstract: A process is described for the electrochemical cleavage of alkali metal sulphates into relatively highly concentrated solutions of alkali metal hydroxide and sulphuric acid by means of the use of a 3-compartment electrodialysis cell at temperatures of >/= 70 to equipped with an anion exchanger membrane, the polymeric ion exchanger matrix of which is composed of a styrene/divinylbenzene copolymer, having very highly basic quaternary ammonium groups, and a hydronium ion blocker, on the side of which facing the central chamber is located an anion exchanger layer or anion exchanger membrane having tertiary or secondary amino groups.

    6.
    发明专利
    未知

    公开(公告)号：DE3867451D1

    公开(公告)日：1992-02-13

    申请号：DE3867451

    申请日：1988-12-03

    Applicant: BASF AG

    Inventor： HOHMANN ANDREAS DR ,  REUTHER WOLFGANG DR ,  FIKENTSCHER ROLF DR ,  PROLL THEO DR

    IPC: C07D277/04 ,  C07C319/02 ,  C07C319/06 ,  C07C323/25 ,  C07C323/58 ,  C07D277/60

    Abstract: Prodn. of cysteamine acid-addn. salts HS(CH2)2NH2.Hx (I) is effected by (a) reacting aziridine (II) and a ketone of formula R1COR2 (III) with a hydrosulphide of formula MHS (IV) at -10 to +100 deg.C with addn. or a medium to strong acid (V) to maintain a pH of at least 8.5; and (b) hydrolysing the thiazolidine intermediate of formula (VI) in the presence of an acid: In formula R1 and R2=1-6C alkyl, or R1+R2=4-6C alkylene; M=NH4 or metal; X is an acid anion.

    8.
    发明专利
    未知

    公开(公告)号：DE19606877A1

    公开(公告)日：1997-08-28

    申请号：DE19606877

    申请日：1996-02-23

    Applicant: BASF AG

    Inventor： MACHHAMMER OTTO DR ,  DAMS ALBRECHT DR ,  ECK BERND ,  PROLL THEO DR

    IPC: C07C57/04 ,  C07C51/43 ,  C07C57/05 ,  C07C57/07

    Abstract: A process for purifying (meth)acrylic acid by phase separation techniques comprises the following steps: (a) a mixture containing (meth)acrylic acid is separated into distinct phases in the presence of an organic solvent, with the composition of the (meth)acrylic acid-rich phase remaining essentially unchanged, and this acid-rich phase is separated; (b) the remaining phase from step (a) is separated into indistinct phases; and (c) one of the phases from step (b) is returned to step (a). Also claimed is preparation of (meth)acrylic acid. Preferably in step (c) the acid-rich phase is returned to step (a). 1-100 (100) wt.% of the phase remaining from step (a) is used in step (b). Pure end product is added to steps (a) and (b). Step (a) involves crystallisation, freezing or sublimation, preferably static and/or dynamic crystallisation, and most preferably a combined static and dynamic crystallisation in which the residue from the dynamic crystallisation is added to the static crystallisation step and the crystallised product from the static crystallisation is returned to the dynamic crystallisation.

    Preparation of aziridine(s) for use as paper production processing aids
    9.
    发明专利
    Preparation of aziridine(s) for use as paper production processing aids 未知

    公开(公告)号：DE19548317A1

    公开(公告)日：1997-06-26

    申请号：DE19548317

    申请日：1995-12-22

    Applicant: BASF AG

    Inventor： STEUERLE ULRICH DR ,  PROLL THEO DR ,  HUELTENSCHMIDT WILFRIED

    IPC: C07D203/02

    Abstract: Preparation of aziridines involves reacting compounds of formula (I) X-C(R )(R )-C(R )(R )-NHR (I),where R - R = H, 1-8C alkyl or aryl ; R = R , benzyl, 1-8C hydroxyalkyl or 1-8C aminoalkyl ; X = -OSO3H, -OSO2-R, halogen or -O-CO-R ;R = alkyl or aryl; and R = H or 1-8C alkyl, with aqueous alkali(ne earth) metal bases at 80 - 280 deg C and up to 100 bar. The reaction is carried out in at least two reactors located one after the other in a cascade, so that the conversion rate of (I) in each reactor is 20 - 90 % and the aziridines are removed from the reaction mixture downstream of each reactor.

    10.
    发明专利
    未知

    公开(公告)号：DE59104734D1

    公开(公告)日：1995-04-06

    申请号：DE59104734

    申请日：1991-03-16

    Applicant: BASF AG

    Inventor： HABERMANN WOLFGANG ,  BOCHNITSCHEK WERNER DR ,  FRITZMANN JOHANN DR ,  HAMMES PETER DR ,  PROLL THEO DR ,  WEISBRODT WALTER DR

    IPC: C25B1/16 ,  B01D61/44 ,  B01D61/52 ,  C25B1/10 ,  C25B1/22 ,  C25B13/04

    Abstract: A process is described for the electrochemical cleavage of alkali metal sulphates into relatively highly concentrated solutions of alkali metal hydroxide and sulphuric acid by means of the use of a 3-compartment electrodialysis cell at temperatures of >/= 70 to equipped with an anion exchanger membrane, the polymeric ion exchanger matrix of which is composed of a styrene/divinylbenzene copolymer, having very highly basic quaternary ammonium groups, and a hydronium ion blocker, on the side of which facing the central chamber is located an anion exchanger layer or anion exchanger membrane having tertiary or secondary amino groups.

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