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84 records (took 0.023 seconds)

    61.
    发明专利
    未知

    公开(公告)号：ID16044A

    公开(公告)日：1997-08-28

    申请号：ID970559

    申请日：1997-02-24

    Applicant: BASF AG

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

    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.

    Zpusob výroby kyseliny akrylové a kyseliny metakrylové
    65.
    发明专利
    Zpusob výroby kyseliny akrylové a kyseliny metakrylové 未知

    公开(公告)号：CZ298792B6

    公开(公告)日：2008-01-30

    申请号：CZ2000885

    申请日：1998-09-09

    Applicant: BASF AG

    Inventor： ECK BERND ,  MACHHAMMER OTTO ,  PROLL THEO ,  SCHLIEPHAKE VOLKER ,  THIEL JOACHIM ,  BROELLOS KLAUS

    IPC: C07C51/43 ,  C07C51/44 ,  C07C57/07

    Abstract: Zpusob výroby kyseliny akrylové nebo metakrylové výrobou plynné smesi produktu, která má v podstatesložení reakcní smesi z katalytické oxidace v plynné fázi alkanu, alkenu, alkanolu a/nebo alkanalu se 3 nebo 4 uhlíkovými atomy a/nebo jejich predstupnu na kyselinu akrylovou, prípadne kyselinu metakrylovou. Oddelení kyseliny akrylové nebo metakrylové z plynné smesi produktu se pritom provádí zpusobem, který obsahuje následující kroky: a) kondenzace plynné smesi produktu, b) krystalizace kyseliny akrylové nebo kyseliny metakrylové z roztoku získaného ve stupni a), c) oddelení získaných krystalu z matecného louhu stupne b) a d) zpetné uvedení nejméne cásti matecného louhu ze stupne c) do stupne a).

    67.
    发明专利
    未知

    公开(公告)号：ES2175794T3

    公开(公告)日：2002-11-16

    申请号：ES98948948

    申请日：1998-09-09

    Applicant: BASF AG

    Inventor： ECK BERND ,  MACHHAMMER OTTO ,  PROLL THEO ,  SCHLIEPHAKE VOLKER ,  THIEL JOACHIM ,  BROLLOS KLAUS

    IPC: C07C51/43 ,  C07C51/44 ,  C07C57/07

    Abstract: A process for preparing acrylic acid or methacrylic acid comprises preparing a gaseous product mixture having essentially the composition of a reaction mixture of the catalytic gas phase oxidation of C3-/C4-alkanes, -alkenes, -alkanols and/or -alkanals and/or precursors thereof to form acrylic acid or methacrylic acid. The product is removed from the gaseous product mixture by a process comprising the following steps:(a) condensing said gaseous product mixture,(b) crystallizing acrylic acid or methacrylic acid from the solution obtained in step (a),(c) removing the resulting crystals from the mother liquor, and(d) recycling at least a portion of said mother liquor from step (c) into step (a).

    69.
    发明专利
    未知

    公开(公告)号：ID27390A

    公开(公告)日：2001-04-05

    申请号：ID20010163

    申请日：1999-07-21

    Applicant: BASF AG

    Inventor： ECK BERND ,  HEILEK JORG ,  SCHLEIPHAKE VOLKER ,  PROLL THEO ,  BROLLOS KLAUS ,  THIEL JOACHIM ,  MACHHAMMER OTTO

    IPC: C07C51/225 ,  C07C51/43 ,  C07C57/05 ,  C07C57/07

    Abstract: A process for the preparation of acrylic acid by:(a) preparation of a gaseous product mixture which essentially has the composition of a reaction mixture of catalytic gas-phase oxidation of C3-alkanes, C3-alkenes, C3-alkanols and/or C3-alkanals and/or intermediates thereof to acrylic acid, which comprises(b) condensation of the gaseous product mixture,(c) crystallization of the acrylic acid from the solution obtained in stage (b), with partial evaporation of the solution under reduced pressure,(d) isolation of the resulting crystals from the mother liquor,(e) recycling of at least a part of the mother liquor from stage (d) to stage (b) and(f) recycling of at least a part of the evaporated solution from stage (c) to stage (b).

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