PURIFICACION DE ACIDO ACRILICO Y ACIDO METACRILICO.

    公开(公告)号:MX9701227A

    公开(公告)日:1997-08-30

    申请号:MX9701227

    申请日:1997-02-18

    Applicant: BASF AG

    Abstract: El ácido acrílico o el ácido metacrílico se purifica mediante (a) sometiendo una mezcla que comprende el ácido acrílico o el ácido metacrílico a un proceso de separacion definido con precision, esencialmente en ausencia de un solvente orgánico, con la composicion de la fase en la cual se acumula el ácido acrílico o el ácido metacrílico permaneciendo esencialmente constante cuando cambia la composicion de las otras fases que participan en la transferencia de masa, extrayendo esta fase, y (b) sometiendo por lo menos una parte de la fase restante de la etapa (a) a un proceso de separacion definido con menor precision, y (c) alimentar una de las fases formadas en la etapa (b) al proceso de separacion definido con precision en la etapa (a). Además, la invencion proporciona un proceso para preparar ácido acrílico o ácido metacrílico que incluye el proceso de purificacion mencionado anteriormente.

    PURIFICATION OF ACRYLIC ACID AND METHACRYLIC ACID

    公开(公告)号:CA2198142A1

    公开(公告)日:1997-08-24

    申请号:CA2198142

    申请日:1997-02-20

    Applicant: BASF AG

    Abstract: Acrylic acid or methacrylic acid is purified by (a) subjecting a mixture comprising the acrylic acid or methacrylic acid to a sharply defined separation process essentially in the absence of an organic solvent, with the composition of the phase in which the acrylic acid or methacrylic acid accumulates remaining essentially constant when the composition of the other phases participating in the mass transfer changes, then taking off this phase and (b) subjecting at least a part of the remaining phase from stage(a) to a less sharply defined separation process and (c) feeding one of the phases formed in stage (b) to the sharply defined separation process in stage (a). In addition, the invention provides a process for preparing acrylic acid or methacrylic acid which includes the abovementioned purification process.

    Zpusob prípravy kyseliny (meth)akrylové

    公开(公告)号:CZ298267B6

    公开(公告)日:2007-08-08

    申请号:CZ43697

    申请日:1997-02-12

    Applicant: BASF AG

    Abstract: Postup prípravy kyseliny (meth)akrylové zahrnující následující stupne: (I) katalytickou oxidaci propenu nebo izobutenu a/nebo akroleinu nebo methakroleinu v plynné fázi na kyselinu (meth)akrylovou zavzniku plynného reakcního produktu obsahujícího kyselinu (meth)akrylovou; (II) absorpci tohoto reakcního produktu za použití vysokovroucího rozpouštedla; (III) rozdelení rozpouštedla s absorbovaným produktem ze stupne (I), které se získá ve stupni (II), na rozpouštedlo a surovou (meth)akrylovou kyselinu pomocí destilace; (IV) vycištení surové (meth)akrylové kyseliny ze stupne (III) krystalizací za vzniku (meth)akrylové kyseliny; a (V) recirkulaci prinejmenším cásti výsledného matecného louhu dostupne (II) a/nebo stupne (III).

    46.
    发明专利
    未知

    公开(公告)号:DE50108001D1

    公开(公告)日:2005-12-15

    申请号:DE50108001

    申请日:2001-04-04

    Applicant: BASF AG

    Abstract: In a process for the purification of a crude acrylic acid melt, the crude acrylic acid melt is converted, under the action of low temperatures, into a crude acrylic acid suspension consisting of acrylic acid crystals and residual melt, and the acrylic acid crystals of the crude acrylic acid suspension are freed from remaining residual melt in a wash column, the production of the acrylic acid crystals of the crude acrylic acid suspension being carried out in the presence of water, the wash column being a wash column with forced transport of the acrylic acid crystals and the wash liquid used being the melt of acrylic acid crystals purified in the wash column.

    Purification process of raw acrylic acid melts

    公开(公告)号:CZ20023376A3

    公开(公告)日:2003-05-14

    申请号:CZ20023376

    申请日:2001-04-04

    Applicant: BASF AG

    Abstract: In a process for the purification of a crude acrylic acid melt, the crude acrylic acid melt is converted, under the action of low temperatures, into a crude acrylic acid suspension consisting of acrylic acid crystals and residual melt, and the acrylic acid crystals of the crude acrylic acid suspension are freed from remaining residual melt in a wash column, the production of the acrylic acid crystals of the crude acrylic acid suspension being carried out in the presence of water, the wash column being a wash column with forced transport of the acrylic acid crystals and the wash liquid used being the melt of acrylic acid crystals purified in the wash column.

    50.
    发明专利
    未知

    公开(公告)号:DE59707380D1

    公开(公告)日:2002-07-11

    申请号:DE59707380

    申请日:1997-02-20

    Applicant: BASF AG

    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.

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