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    51.
    发明专利
    未知

    公开(公告)号：DE502004008929D1

    公开(公告)日：2009-03-12

    申请号：DE502004008929

    申请日：2004-03-03

    Applicant: BASF SE

    Inventor： STROEFER ECKHARD ,  LANG NEVEN ,  LICHTFERS UTE ,  STEINBRENNER ULRICH ,  HASSE HANS

    IPC: B01D1/22 ,  B01D1/30 ,  C08G2/08

    Abstract: A method for separating a liquid mixture containing readily-volatile and sparingly-volatile components involves using a film evaporator with a heat-exchange surface which is coated with material which catalyses the formation of readily-volatile component(s) in the liquid film. A method for separating a liquid mixture containing (A) readily-volatile and (B) sparingly-volatile components in a film evaporator by (i) producing a continuous stream of a liquid starting mixture, (ii) producing a liquid film from the mixture and bringing it into contact with a heat-exchange surface of the evaporator, and (iii) partly evaporating the film to give two gas streams rich in (A) and (B) respectively. In this method, (iv) the heat-exchange surface is coated with a catalytic material and (v) a chemical reaction in which (A) is/are formed is catalysed in the liquid film. An independent claim is also included for a film evaporator with a heat-exchanger wall which is coated with catalytic material.

    52.
    发明专利
    未知

    公开(公告)号：AT417843T

    公开(公告)日：2009-01-15

    申请号：AT06778089

    申请日：2006-08-01

    Applicant: BASF SE

    Inventor： LANG NEVEN ,  STROEFER ECKHARD ,  STAMMER ACHIM ,  FRIESE THORSTEN ,  SIEGERT MARKUS ,  HASSE HANS ,  GRUETZNER THOMAS ,  BLAGOV SERGEJ

    IPC: C07D323/06

    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.

    53.
    发明专利
    未知

    公开(公告)号：DE502004008459D1

    公开(公告)日：2008-12-24

    申请号：DE502004008459

    申请日：2004-12-21

    Applicant: BASF SE

    Inventor： SIEGERT MARKUS ,  LANG NEVEN ,  STROEFER ECKHARD ,  STAMMER ACHIM ,  FRIESE THORSTEN ,  HASSE HANS

    IPC: C07D323/06

    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.

    PROCESS FOR PREPARING CYCLIC FORMALDEHYDE DERIVATIVES FROM POLYOXYDIALKYL ETHERS
    54.
    发明专利
    PROCESS FOR PREPARING CYCLIC FORMALDEHYDE DERIVATIVES FROM POLYOXYDIALKYL ETHERS 未知

    公开(公告)号：CA2673237A1

    公开(公告)日：2008-10-09

    申请号：CA2673237

    申请日：2008-03-27

    Applicant: BASF SE

    Inventor： STROEFER ECKHARD ,  LANG NEVEN ,  SIEGERT MARKUS ,  HASSE HANS

    IPC: C07D323/06

    Abstract: The invention relates to a method for producing trioxane from trioxymethy lene glycol dimethyl ether (POMD- MEn=3) by reacting trioxymethylene glycol dimethyl ether in the presence of an acidic catalyst and subsequently proces sing the reaction mixture by distillation. The method comprises the followin g steps: a) feeding trioxymethylene glycol dimethyl ether (POMDMEn=3) or a m ixture containing trioxymethylene glycol dimethyl ether to a reactor and rea cting the substance in the presence of an acidic catalyst to give a mixture (a) containing trioxane, formaldehyde, water, methylene glycol (MG), polyoxy methylene glycols (MGn>1), methanol, hemiformals (HF), methylal (POMDMEn= 1) and polyoxymethylene glycol dimethyl ether (POMDMEn>1); b) separating the reaction mixture (a) by distillation to give a low-boiling fraction (b1) containing trioxane, formaldehyde, water, methylene glycol, methanol, hemif ormal (HFn=1), methylal and dioxymethylene glycol dimethyl ether (POMDMEn=2) and a high-boiling fraction (b2) containing trioxane, polyoxymethylene glyc ols (MGn>1), hemiformals (HFn>1) and polyoxymethylene glycol dimethyl ether (POMDMEn>2); c) separating the high-boiling fraction (b2) by distil lation to give a low-boiling fraction (c1) containing trioxane and a high-bo iling fraction (c2) containing polyoxymethylene glycols (MGn>1), hemiform als (HFn>1) and polyoxymethylene glycol dimethyl ether (POMDMEn=2).

    Method for the production of dioxolane
    55.
    发明专利
    Method for the production of dioxolane 未知

    公开(公告)号：MX2008003115A

    公开(公告)日：2008-04-30

    申请号：MX2008003115

    申请日：2008-03-05

    Applicant: BASF SE

    Inventor： SIEGERT MARKUS ,  LANG NEVEN ,  STROEFER ECKHARD ,  STAMMER ACHIM

    Abstract: Processes comprising: providing a reactive distillation column having an upper region, a middle region and a lower region; feeding ethylene glycol and an aqueous formaldehyde solution into the reactive distillation column in the middle region of the reactive distillation column; reacting the ethylene glycol and the aqueous formaldehyde solution in the reactive distillation column in the presence of a catalyst to form dioxolane; removing a product stream comprising dioxolane in an amount of at least 75% by weight from the upper region of the reactive distillation column; and removing a bottom stream comprising one or more components having boiling points higher than dioxolane from the lower region of the reactive distillation column.

    56.
    发明专利
    未知

    公开(公告)号：DK1805162T3

    公开(公告)日：2008-03-31

    申请号：DK05798084

    申请日：2005-10-20

    Applicant: BASF SE

    Inventor： SIEGERT MARKUS ,  LANG NEVEN ,  STROEFER ECKHARD ,  STAMMER ACHIM ,  FRIESE THORSTEN

    IPC: C07D323/06

    Abstract: Processes are disclosed comprising: (a) reacting an aqueous formaldehyde solution in a reactor in the presence of a suitable catalyst to obtain a reaction product mixture comprising trioxane, formaldehyde and water; (b) distilling the reaction product mixture to form a top stream comprising crude trioxane; and (c) treating the top stream in one or more additional stages to form pure trioxane; wherein an aqueous sidestream is drawn off during the distilling of the reaction mixture.

    Method for production of polyoxymethylene homo- or co-polymers
    57.
    发明专利
    Method for production of polyoxymethylene homo- or co-polymers 未知

    公开(公告)号：AU2006283847A1

    公开(公告)日：2007-03-01

    申请号：AU2006283847

    申请日：2006-08-25

    Applicant: BASF SE

    Inventor： STAMMER ACHIM ,  LANG NEVEN ,  ZOLLNER KNUT ,  STOCKELMANN ELMAR

    IPC: C08G2/10 ,  C07D323/06 ,  C08G2/28

    Abstract: A process for preparing polyoxymethylene homopolymers or copolymers by homopolymerization or copolymerization of trioxane or additionally of suitable comonomers, in which trioxane which still comprises residual monomers is firstly prepared in a monomer plant and is degassed in one or more stages to give one or more vapor streams ( 13, 14 ) which are, if appropriate, fed to a condenser (K) in which the condensable fractions of these vapor streams are condensed to give a condensate ( 15 ) which is recycled to the polymerization reactor (P) and one or more gaseous, formaldehyde-comprising streams ( 16 ) and also a partially degassed polyoxymethylene homopolymer or copolymer ( 17 ) which is fed to an extruder (E) or kneader and is mixed with customary additives and processing aids in this to give a polymer melt ( 19 ) and extraction of a formaldehyde-comprising extruder or kneader offgas ( 18 ) from the extruder (E) or kneader, wherein the formaldehyde-comprising secondary streams ( 14, 16, 18 ) from the polymer plant are recycled directly without addition of auxiliaries to the monomer plant, is proposed

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