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    1.
    发明专利
    未知

    公开(公告)号：AT327275T

    公开(公告)日：2006-06-15

    申请号：AT00972868

    申请日：2000-10-25

    Applicant: BASF AG

    Inventor： BERTOLA ALDO ,  CASSARINO SALVATORE ,  HOBE MYRIAM

    IPC: C08G65/26 ,  C08G65/20 ,  C08G65/30 ,  C08G65/331

    Abstract: A continuous process for converting by transesterification the diester of polytetramethylene ether (PTMEA) to the corresponding polytetramethylene ether glycol (PTMEG). The process is characterized by the fact that the feed, consisting of PTMEA along with an alkanol (preferably methanol) and with an alkali metal oxide, hydroxide or alkoxide catalyst (preferably sodium methaoxide) is made to react in two multistaged reactions in series. In the first reactant, including stages of retention in association with distillation trays of high efficiency, the bulk of conversion is achieved by stripping the alkanol ester formed in the transesterification with vapors of hot alkanol having a reduced content of alkanol ester. The transesterification is completed in the second reaction by stripping the effluent from the first reactor with vapors of hot alkanol almost free of alkanol ester. The PTMEG product is finally purified by neutralizing the alkaline catalyst with a mixture of phosphoric acid and sodium phosphate monobasic.

    3.
    发明专利
    未知

    公开(公告)号：AT222898T

    公开(公告)日：2002-09-15

    申请号：AT99959273

    申请日：1999-11-08

    Applicant: BASF AG

    Inventor： BERTOLA ALDO ,  CONSTANTINESCU TAKE ,  RAUCQ PHILIPPE ,  CASSARINO SALVATORE

    IPC: C07B61/00 ,  C07D307/08 ,  C07D307/33 ,  C07D315/00

    Abstract: A process for production of tetrahydrofuran and gamma butyrolactone by hydrogenation of maleic anhydride recovered from a process of conversion of a n-butane. The process consists essentially of the following steps: A) converting n-butane to maleic anhydride by catalytic vapor phase oxidation; B) recovering maleic anhydride from the effluent gases of butane oxidation by selective absorption in gamma butyrolactone, forming a maleic anhydride-gamma butyrolactone mixture; C) removing water from the maleic anhydride-gamma butyrolactone mixture in a stripper under the action of a gas and/or under vacuum conditions, producing a maleic anhydride-gamma butyrolactone mixture with minimum water and maleic acid content; D) recovering gamma butyrolactone contained in the exhaust gases leaving the maleic anhydride absorber, by absorption in water; E) dehydrating the recovered gamma butyrolactone and recycling it to the maleic anhydride absorber; F) hydrogenating the dewatered maleic anhydride-gamma butyrolactone mixture, over suitable catalyst (s), under conditions favouring the formation of tetrahydrofuran and gamma butyrolactone; G) separating by distillation tetrahydrofuran, gamma butyrolactone and the by-products from the resulting hydrogenation mixture; H) recycling a gamma butyrolactone rich stream to the selective absorption of maleic anhydride.

    5.
    发明专利
    未知

    公开(公告)号：DE69909921T2

    公开(公告)日：2004-04-22

    申请号：DE69909921

    申请日：1999-04-02

    Applicant: BASF AG

    Inventor： BERTOLA ALDO

    IPC: C07D207/26 ,  C07D207/267

    Abstract: A process for the production of N-methyl-pyrrolidone obtained by reaction of gammabutyrolactone and mononmethylamine; wherein the synthesis is carried out by a continuous non catalytic process in liquid phase, via three distinct reaction stages connected in series.

    6.
    发明专利
    未知

    公开(公告)号：DE69722262T2

    公开(公告)日：2004-03-25

    申请号：DE69722262

    申请日：1997-12-02

    Applicant: BASF AG

    Inventor： HOBE MYRIAM ,  BERTOLA ALDO

    IPC: C07B61/00 ,  C07C67/08 ,  C07C69/60 ,  C07C69/80

    Abstract: An improved process for the production of high quality unsaturated dimethylesters by reacting dicarboxylic anhydrides, typically maleic anhydride or phthalic anhydride, with methanol. The process is characterized by the fact that the esterification is performed in two steps, the step 1 consisting in a non catalytic reaction of formation of monomethylesters, and the step 2 consisting in the catalytic reaction of formation of dimethylesters from the monomethylester, the said catalytic reaction taking place in a reactor consisting of a multi-tray column where the liquid phase containing the mono and diester mixture flows downwards from each tray coming to contact with a progressively drier upflowing stream of vapors in countercurrent, which continuously removes the water formed in the reaction from the liquid phase. The process uses an alkylbenzene sulfonic acid with an alkyl radical containing from 10 to 13 carbon atoms as esterification catalyst.

    7.
    发明专利
    未知

    公开(公告)号：ES2200213T3

    公开(公告)日：2004-03-01

    申请号：ES97952854

    申请日：1997-12-02

    Applicant: BASF AG

    Inventor： HOBE MYRIAM ,  BERTOLA ALDO

    IPC: C07B61/00 ,  C07C67/08 ,  C07C69/60 ,  C07C69/80

    Abstract: An improved process for the production of high quality unsaturated dimethylesters by reacting dicarboxylic anhydrides, typically maleic anhydride or phthalic anhydride, with methanol. The process is characterized by the fact that the esterification is performed in two steps, the step 1 consisting in a non catalytic reaction of formation of monomethylesters, and the step 2 consisting in the catalytic reaction of formation of dimethylesters from the monomethylester, the said catalytic reaction taking place in a reactor consisting of a multi-tray column where the liquid phase containing the mono and diester mixture flows downwards from each tray coming to contact with a progressively drier upflowing stream of vapors in countercurrent, which continuously removes the water formed in the reaction from the liquid phase. The process uses an alkylbenzene sulfonic acid with an alkyl radical containing from 10 to 13 carbon atoms as esterification catalyst.

    8.
    发明专利
    未知

    公开(公告)号：DE69722262D1

    公开(公告)日：2003-06-26

    申请号：DE69722262

    申请日：1997-12-02

    Applicant: BASF AG

    Inventor： HOBE MYRIAM ,  BERTOLA ALDO

    IPC: C07B61/00 ,  C07C67/08 ,  C07C69/60 ,  C07C69/80

    Abstract: An improved process for the production of high quality unsaturated dimethylesters by reacting dicarboxylic anhydrides, typically maleic anhydride or phthalic anhydride, with methanol. The process is characterized by the fact that the esterification is performed in two steps, the step 1 consisting in a non catalytic reaction of formation of monomethylesters, and the step 2 consisting in the catalytic reaction of formation of dimethylesters from the monomethylester, the said catalytic reaction taking place in a reactor consisting of a multi-tray column where the liquid phase containing the mono and diester mixture flows downwards from each tray coming to contact with a progressively drier upflowing stream of vapors in countercurrent, which continuously removes the water formed in the reaction from the liquid phase. The process uses an alkylbenzene sulfonic acid with an alkyl radical containing from 10 to 13 carbon atoms as esterification catalyst.

    10.
    发明专利
    未知

    公开(公告)号：ES2175943T3

    公开(公告)日：2002-11-16

    申请号：ES99906098

    申请日：1999-01-05

    Applicant: BASF AG

    Inventor： BERTOLA ALDO

    IPC: B01J29/06 ,  C07D307/08 ,  C07D307/33 ,  C07D315/00 ,  C07D307/32

    Abstract: A two-stage process for producing tetrahydrofuran and gammabutyrolactone in varying proportions from maleic, succinic anhydride or fumaric acid esters, by vapor phase hydrogenation. The first stage occurs on a copper-based catalyst to produce a mixture of tetrahydrofuran, gammabutyrolactone and butanediol. The second stage occurs on an acidic silica rich silica-alumina type catalyst to convert butanediol to tetrahydrofuran.

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