中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

112 records (took 0.025 seconds)

    41.
    发明专利
    未知

    公开(公告)号：MX226058B

    公开(公告)日：2005-02-03

    申请号：MXPA02006394

    申请日：2000-12-21

    Applicant: BASF AG

    Inventor： DERNBACH MATTHIAS ,  KRATZ DETLEF ,  STAMMER ACHIM ,  RUST HARALD ,  SCHULZ GERHARD

    IPC: C07B61/00 ,  C07C29/80 ,  C07C31/22

    Abstract: A process is disclosed for the purification, by distillation, of trimethylolpropane originating from the hydrogenation of 2,2-dimethylolbutanal, said process including the following steps:(a) reaction of n-butyraldehyde with formaldehyde in the presence of catalytic amounts of a tertiary amine, and hydrogenation of the resulting mixture to give a mixture containing trimethylolpropane;(b) separation of water, methanol, trialkylamine and/or trialkylammonium formate by distillation;(c) heating of the residue obtained in (b) under reduced pressure to a temperature at which TMP is volatile and compounds boiling above TMP are cleaved, in order to separate off, by distillation, TMP and compounds more volatile than TMP;(d) distillation of the distillate obtained in (c) in order to separate off the more volatile compounds and recover pure TMP; and(e) optional distillation of the TMP obtained in (d) in order to recover TMP with a low APHA color index.A process is also disclosed in which trialkylammonium formate is distilled under mild conditions from crude mixtures of polyhydric alcohols, predominantly trimethylolpropane.

    42.
    发明专利
    未知

    公开(公告)号：AT269288T

    公开(公告)日：2004-07-15

    申请号：AT00987467

    申请日：2000-12-28

    Applicant: BASF AG

    Inventor： DERNBACH MATTHIAS ,  KRATZ DETLEF ,  STAMMER ACHIM ,  SCHULZ GERHARD

    IPC: C07C29/88 ,  C07C29/141 ,  C07C29/80 ,  C07C31/22

    Abstract: A process is provided for increasing the yield in the preparation of polyhydric alcohols obtained from methylolated alkanals by hydrogenation, wherein derivatives of these alcohols are decomposed by adding 5 ppm to 1% by weight, preferably 100 to 1000 ppm, of a suitable acid to an anhydrous mixture containing these derivatives, heating the mixture to temperatures of 100 to 300° C. and then separating off the polyhydric alcohol by distillation. This process makes it possible simply and efficiently to decompose compounds which boil above the polyhydric alcohol and are unwanted by-products of its synthesis.

    45.
    发明专利
    未知

    公开(公告)号：ES2184146T3

    公开(公告)日：2003-04-01

    申请号：ES97952875

    申请日：1997-12-04

    Applicant: BASF AG

    Inventor： KRATZ DETLEF ,  STAMMER ACHIM ,  SCHULZ GERHARD ,  VOIT GUIDO

    IPC: C07B61/00 ,  C07C29/141 ,  C07C29/80 ,  C07C31/22 ,  C07C45/75 ,  C07C47/19

    Abstract: Methylolalkanal of the formula II(R=CH2OH, C1-C22-alkyl, aryl or C6-C22-aralkyl) is prepared spe-wise bya) reacting a C2-C24-aldehyde with formaldehyde in the presence of a tertiary amine,b) separating the reaction mixturei) into a bottom fraction comprising the compound of formula II and an incompletely methylolated compound of the formula IIIand a distillate stream comprising unconverted or partially converted starting materials, orii) into an aqueous phase and an organic phase, and recycling the distillate stream or the organic phase to a), andc) subjecting the bottom fraction or the aqueous phasei) to a catalytic or thermal reaction to convert the compound of formula III to the compound of formula II and to a corresponding methylene compound of formula IV(R'=H or R) andii) separating the reaction product into an overhead stream comprising the compound of formula IV and unconverted formaldehyde which is recycled to a), and a bottom fraction comprising the compound of formula II.

    47.
    发明专利
    未知

    公开(公告)号：BR0016807A

    公开(公告)日：2002-09-10

    申请号：BR0016807

    申请日：2000-12-27

    Applicant: BASF AG

    Inventor： DERNBACH MATTHIAS ,  KRATZ DETLEF ,  STAMMER ACHIM ,  SCHULZ GERHARD

    IPC: C07B61/00 ,  C07C29/14 ,  C07C31/22 ,  C07C45/75 ,  C07C45/82 ,  C07C45/83 ,  C07C45/86 ,  C07C47/058 ,  C07C47/19 ,  C07C45/80

    Abstract: Formaldehyde is removed by distillation from reaction solutions containing a methlolated alkanal which was obtained from the reaction of formaldehyde with an alkanal which has at least one acidic hydrogen atom alpha to the carbonyl function or from the reaction of a 2-alkylacrolein or acrolein with water and formaldehyde, by a process in which this reaction was carried out in the presence of catalytic amounts of organic amine. The process permits the improved removal of formaldehyde from the reaction mixture and furthermore facilitates the hydrogenation of the alkanals thus obtained to give polyols.

Patent Agency Ranking