12.
    发明专利
    未知

    公开(公告)号:DE50306511D1

    公开(公告)日:2007-03-29

    申请号:DE50306511

    申请日:2003-05-13

    Applicant: BASF AG

    Abstract: Production of trioxane by trimerization of formaldehyde in aqueous acid solution followed by separation of trioxane from a crude trioxane product mixture of trioxane, water and formaldehyde comprises: distillation of the crude trioxane; crystallization of the trioxane and; separation from the mother liquor followed by melting and distillation of other byproducts. A process for the production of trioxane by trimerization of formaldehyde in aqueous acid solution followed by separation of trioxane from a crude trioxane product mixture of trioxane, water and formaldehyde comprises: (a) distillation of the crude trioxane; (b) crystallization of the trioxane and; (c) separation from the mother liquor followed by; (d) melting and; (e) distillation of other byproducts.

    13.
    发明专利
    未知

    公开(公告)号:AT353883T

    公开(公告)日:2007-03-15

    申请号:AT03752664

    申请日:2003-05-13

    Applicant: BASF AG

    Abstract: Production of trioxane by trimerization of formaldehyde in aqueous acid solution followed by separation of trioxane from a crude trioxane product mixture of trioxane, water and formaldehyde comprises: distillation of the crude trioxane; crystallization of the trioxane and; separation from the mother liquor followed by melting and distillation of other byproducts. A process for the production of trioxane by trimerization of formaldehyde in aqueous acid solution followed by separation of trioxane from a crude trioxane product mixture of trioxane, water and formaldehyde comprises: (a) distillation of the crude trioxane; (b) crystallization of the trioxane and; (c) separation from the mother liquor followed by; (d) melting and; (e) distillation of other byproducts.

    14.
    发明专利
    未知

    公开(公告)号:DE102005037294A1

    公开(公告)日:2007-02-15

    申请号:DE102005037294

    申请日:2005-08-08

    Applicant: BASF AG

    Abstract: The invention relates to an integrated process for preparing trioxane from formaldehyde in which, in a first step, a stream A 1 comprising water and formaldehyde and a recycle stream B 2 consisting substantially of water and formaldehyde are fed to a trioxane synthesis reactor in which the formaldehyde is converted to trioxane to obtain a product stream A 2 comprising trioxane, water and formaldehyde. Stream A 2 and a recycle stream D 1 comprising trioxane, water and formaldehyde are fed to a first distillation column and distilled at a pressure in the range from 0.1 to 2.5 bar to obtain a stream B 1 enriched in trioxane, and the stream B 2 consisting substantially of water and formaldehyde. Stream B 1 is fed to a second distillation column and distilled at a pressure in the range from 0.2 to 17.5 bar to obtain a product stream C 2 consisting substantially of trioxane, and a stream C 1 comprising trioxane, water and formaldehyde. Stream C 1 is fed to a third distillation column and distilled at a pressure in the range from 1 to 10 bar to obtain the recycle stream D 1 comprising trioxane, water and formaldehyde, and a stream D 2 consisting substantially of water.

    Preparing alkyl ester of (meth)acrylic acid comprises supplying (meth)acrylic acid, alkanol and catalyst to reaction zone, adding discharged mixture to rectification unit, supplying a partial flow of sump stream and isolating streams

    公开(公告)号:DE102005010587A1

    公开(公告)日:2006-06-08

    申请号:DE102005010587

    申请日:2005-03-08

    Applicant: BASF AG

    Abstract: Continuous preparation of alkyl ester of (meth)acrylic acid (A) comprises supplying (meth)acrylic acid, 1-5C alkanol and acid esterifying catalyst (a) to a reaction zone (5,6); adding the discharged reaction mixture to a rectification unit (I); isolating the alkyl ester of (meth)acrylic acid containing in main stream (23) and a sump stream (22); supplying a partial flow of the sump stream; and isolating the separated sump stream (40). Continuous preparation of alkyl ester of (meth)acrylic acid (A) comprises reacting (meth)acrylic acid and 1-5C alkanol in homogeneous, liquid, solvent-free phase with increased temperature and in presence of a acid esterifying catalyst, where (meth)acrylic acid, alkanol and acid esterified catalyst are supplied to a reaction zone (5,6) (that water formed during a retention time are separated rectificative as a component of a alkanol comprising mixture in one of the reaction zone mounted rectification unit (III), in which obtained distillate is isolated in a alkanol containing organic and a water containing aqueous phase, the organic phase is led back into (III) and the aqueous phase is removed, and a reaction mixture (21) is discharged from the reaction zone); initiating the mixture into a rectification unit (I) and the alkyl ester of (meth)acrylic acid containing in main stream (23) and a sump stream (22) are isolated under addition of water; supplying a partial flow of the sump stream (22) from (I) of a residue column unit (IV) comprising a column boiler (61) and recycling into a main stream (29) in (I) and isolating the separated sump stream (40); where (IV) comprises a rectification column (62) in addition to the column boiler, and the ascending vapors from the column boiler are initiated into the rectification column, and resulting liquid at the lowest stage of the rectifying column is led into the column boiler, where the rectification column is operated in a manner, such that the water content of the resulting liquid at the lowest stage is smaller than 0.1 wt.%.

    METHOD FOR PRODUCING PURE TRIOXANE
    16.
    发明专利

    公开(公告)号:PL374560A1

    公开(公告)日:2005-10-31

    申请号:PL37456003

    申请日:2003-05-13

    Applicant: BASF AG

    Abstract: Production of trioxane by trimerization of formaldehyde in aqueous acid solution followed by separation of trioxane from a crude trioxane product mixture of trioxane, water and formaldehyde comprises: distillation of the crude trioxane; crystallization of the trioxane and; separation from the mother liquor followed by melting and distillation of other byproducts. A process for the production of trioxane by trimerization of formaldehyde in aqueous acid solution followed by separation of trioxane from a crude trioxane product mixture of trioxane, water and formaldehyde comprises: (a) distillation of the crude trioxane; (b) crystallization of the trioxane and; (c) separation from the mother liquor followed by; (d) melting and; (e) distillation of other byproducts.

    Method for separating trioxane from a trioxane/formaldehyde/water mixture by means of pressure change rectification

    公开(公告)号:AU2004309046A1

    公开(公告)日:2005-07-14

    申请号:AU2004309046

    申请日:2004-12-21

    Applicant: BASF AG

    Abstract: A process for removing trioxane from a use stream I of formaldehyde, trioxane and water, by a) providing a use stream I of formaldehyde as the main component and trioxane and water as the secondary components, b) mixing the use stream I with a recycle stream VII to obtain a feed stream Ia, c) distilling the use stream Ia in a first distillation stage to obtain a stream II of formaldehyde as the main component and water as the secondary component, and a stream III of trioxane as the main component and water and formaldehyde as the secondary components, d) distilling the stream III in a second distillation stage having a pressure higher than in the first distillation stage, to obtain a stream IV of trioxane and a stream V of trioxane as the main component and water and formaldehyde as the secondary components, e) distilling the stream V in a third distillation stage to obtain a stream VI of water and the recycle stream VII of trioxane as the main component and water and formaldehyde as the secondary components.

    Method for producing pure trioxane
    18.
    发明专利

    公开(公告)号:AU2003232760A8

    公开(公告)日:2003-12-02

    申请号:AU2003232760

    申请日:2003-05-13

    Applicant: BASF AG

    Abstract: Production of trioxane by trimerization of formaldehyde in aqueous acid solution followed by separation of trioxane from a crude trioxane product mixture of trioxane, water and formaldehyde comprises: distillation of the crude trioxane; crystallization of the trioxane and; separation from the mother liquor followed by melting and distillation of other byproducts. A process for the production of trioxane by trimerization of formaldehyde in aqueous acid solution followed by separation of trioxane from a crude trioxane product mixture of trioxane, water and formaldehyde comprises: (a) distillation of the crude trioxane; (b) crystallization of the trioxane and; (c) separation from the mother liquor followed by; (d) melting and; (e) distillation of other byproducts.

    METODO INTEGRADO PARA PRODUCIR TRIOXANO DE FORMALDEHIDO.

    公开(公告)号:MX2008001005A

    公开(公告)日:2008-03-25

    申请号:MX2008001005

    申请日:2006-08-04

    Applicant: BASF AG

    Abstract: La invencion se relaciona con un proceso integrado para prepara trioxano de formaldehido en el que una corriente A1 que comprende agua y formaldehido y una corriente B2 de reciclado que consiste substancialmente de agua y formaldehido se alimentan a un reactor de sintesis de trioxano en el que el formaldehido se convierte en trioxano para obtener una corriente A2 de producto que comprende trioxano, agua y formaldehido; la corriente A2 se alimenta a una primera columna de destilacion y se destila a una presion en la escala de 0.1 a 2.5 bar para obtener una corriente B1 enriquecida en trioxano, y la corriente B2 que consiste substancialmente de agua y formaldehido; la corriente B1 y la corriente D1 de reciclado que comprende trioxano, agua y formaldehido se alimentan a una segunda columna de destilacion y se destilan a una presion en la escala de 0.2 a 17.5 bar para obtener una corriente C2 de producto que consiste substancialmente detrioxano, y una corriente C1 que comprende trioxano, agua y formaldehido; la corriente C1 se alimenta a una tercera columna de destilacion y se destila a una presion en la escala de 0.1 a 2.5 bar para obtener la corriente D1 de reciclado que comprende trioxano, agua y formaldehido, y una corriente D2 que consiste substancialmente de agua y formaldehido. (Figura 1).

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