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    2.
    发明专利
    未知

    公开(公告)号：DE69902683D1

    公开(公告)日：2002-10-02

    申请号：DE69902683

    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.

    3.
    发明专利
    未知

    公开(公告)号：ES2183630T3

    公开(公告)日：2003-03-16

    申请号：ES99959273

    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：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.

    7.
    发明专利
    未知

    公开(公告)号：DE69902683T2

    公开(公告)日：2003-07-31

    申请号：DE69902683

    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.

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