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    12.
    发明专利
    未知

    公开(公告)号：DE19648745A1

    公开(公告)日：1998-05-28

    申请号：DE19648745

    申请日：1996-11-25

    Applicant: BASF AG

    Inventor： AICHINGER HEINRICH DR ,  FRIED MICHAEL DR ,  NESTLER GERHARD DR ,  DAMS ALBRECHT DR

    IPC: C07C67/08 ,  C07C67/58 ,  C07C69/54 ,  C07C67/48 ,  B01J38/48

    Abstract: The invention relates to a method for producing (meth)acrylic acid esters by reacting (meth)acrylic acid with C4-C12-alkanols in the presence of sulfuric acid or of a sulfuric acid mono-C4-C12-alkyl ester as a catalyst, wherein the catalyst is regenerated by extraction with water from the reaction mixture and the aqueous catalyst solution is reintroduced into the esterification. The concentration of non-reacted alkanol in the reaction mixture that is to be extracted amounts to a maximum of 5 wt.% in relation to said reaction mixture.

    13.
    发明专利
    未知

    公开(公告)号：DE19536178A1

    公开(公告)日：1997-04-03

    申请号：DE19536178

    申请日：1995-09-28

    Applicant: BASF AG

    Inventor： EXNER HERBERT DR ,  BAUR KARL GERHARD DR ,  DOCKNER TONI DR ,  POTTHOFF CHRISTIANE ,  DAMS ALBRECHT DR

    IPC: C07C67/08 ,  C07C67/54 ,  C07C69/54

    Abstract: The continuous prodn. of alkyl(meth)acrylates (I) by the reaction of (meth)acrylic acid (II) and 1-8C monohydric alcohols (III) in homogeneous liq. phase at elevated temp. in the absence of solvent and in presence of an acid esterification catalyst (IV). The process comprises (a) feeding (II), (III) and (IV) continuously into a reaction zone (RZ), (b) removing (I) after a residence time in the form of an azeotrope contg. water or water and (III) in addn. to (I) at the top of a rectifier column (RC) mounted over the RZ, (c) separating the distillate into an organic phase contg. (I) and aq. phase(s) contg. water, (d) recycling part of the organic phase via the top of the column and opt. returning water to the RZ, (e) separating (I) from the rest of the organic phase and removing part of the reaction mixt. continuously from the RZ. The RZ consists of a cascade of at least two reactors in series, and the outflow from one reactor provides the input flow for the next reactor. Also claimed is an appts. for this process.

    14.
    发明专利
    未知

    公开(公告)号：DE19509362A1

    公开(公告)日：1996-09-19

    申请号：DE19509362

    申请日：1995-03-15

    Applicant: BASF AG

    Inventor： SCHMIDT-RADDE MARTIN DR ,  HEIDER MARC DR ,  DAMS ALBRECHT DR ,  RUST HARALD

    IPC: C07D207/26 ,  C07D207/267 ,  C07D211/76 ,  C07D223/10 ,  C07B43/06

    Abstract: Prepn. of N-vinyl-lactams (I) of formula (A) (where R = CH=CH2; n=1-3) comprises reacting lactams (II) of formula (A) (where R = H; n = 1-3) with (a) 10-90 wt.% aq. alkali hydroxide soln. by distn. at 50-250 degrees C and 1-100 mbar with a residence time of 0.1-5 hrs. and then (b) C2H2 at 60-250 degrees C and 1-100 bar. Pref. reaction (a) is carried out in a column with at least 2 theoretical plates. (II) and aq. alkali hydroxide soln. are fed into the upper third of the column. A 30-60, esp. 45-55 wt.% soln., more esp. KOH soln., is used. Reaction is carried out at 70-180 degrees C and 1-30 mbar with a residence time of 0.5-2 hrs.

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