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    METHOD FOR PRODUCING HIGHLY PURE MONOETHYLENE GLYCOL
    14.
    发明专利
    METHOD FOR PRODUCING HIGHLY PURE MONOETHYLENE GLYCOL 未知

    公开(公告)号：PL195588B1

    公开(公告)日：2007-10-31

    申请号：PL34758099

    申请日：1999-09-21

    Applicant: BASF AG

    Inventor： THEIS GERHARD ,  ADRIAN TILL ,  BESSLING BERND ,  HASSE HANS ,  VANSANT FRANS

    IPC: C07C29/80 ,  C07C29/10 ,  C07C31/20

    Abstract: A process for the distillative recovery of high purity monoethylene glycol from the hydrolysis, product of ethylene oxide by pressure dewatering, preferably in a battery, vacuum dewatering and subsequent purifying distillation, wherein during the vacuum dewatering an aqueous stream is withdrawn which contains-monoethylene glycol in a concentration below 1% by weight, preferably below 0.1% by weight, medium boilers and low boilers. The withdrawn aqueous stream is, optionally after further workup, removed from the system.

    PROCESS FOR PREPARING POLYOXYMETHYLENE DIMETHYL ETHERS FROM METHANOL AND FORMALDEHYDE
    15.
    发明专利
    PROCESS FOR PREPARING POLYOXYMETHYLENE DIMETHYL ETHERS FROM METHANOL AND FORMALDEHYDE 未知

    公开(公告)号：CA2610895A1

    公开(公告)日：2007-05-10

    申请号：CA2610895

    申请日：2006-06-12

    Applicant: BASF AG

    Inventor： HASSE HANS ,  STROEFER ECKHARD ,  BLAGOV SERGEJ

    IPC: C08G65/00

    Abstract: A process for preparing tri- and tetraoxymethylene glycol dimethyl ether (POMDMEn=3,4) by reacting formaldehyde with methanol and subsequently workin g up the reaction mixture by distillation, comprising the steps of: a) feeding aqueous formaldehyde solution and methanol into a reactor and reacting to gi ve a mixture a comprising formaldehyde, water, methylene glycol (MG), polyoxymethylene glycols (MGn>1), methanol, hemiformals (HF), methylal (POMDMEn=1) and polyoxymethylene glycol dimethyl ethers (POMDMEn>1); b) feeding the reaction mixture a into a first distillation column and separati ng into a low boiler fraction b1 and a high boiler fraction b2 comprising formaldehyde, water, methanol, polyoxymethylene glycols, hemiformals and polyoxymethylene glycol dimethyl ethers (POMDMEn>1); c) feeding the high boiler fraction b2 into a second distillation column and separating into a l ow boiler fraction c1 comprising formaldehyde, water, methylene glycol, polyoxymethylene glycols, methanol, hemiformals, di-, tri- and tetraoxymethylene glycol dimethyl ether (POMDMEn=2,3,4) and a high boiler fraction c2; d) feeding the low boiler fraction c1 into a third distillation column and separating into a low boiler fraction d1 and a high boiler fracti on d2 substantially consisting of formaldehyde, water, methylene glycol, polyoxymethylene glycols, tri- and tetraoxymethylene glycol dimethyl ether (POMDMEn=3,4); e) feeding the high boiler fraction d2 into a phase separatio n apparatus and separating into an aqueous phase e1 substantially consisting o f formaldehyde, water, methylene glycol and polyoxymethylene glycols, and an organic phase e2 comprising tri- and tetraoxymethylene glycol dimethyl ether (POMDMEn=3,4); f) feeding the organic phase e2 into a fourth distillation column and separating into a low boiler fraction f1 substantially consisting of formaldehyde, water, methylene glycol and polyoxymethylene glycols, and a high boiler fraction f2 substantially consisting of tri- and tetraoxymethyle ne glycol dimethyl ether (POMDMEn=3,4).

    INTEGRATED METHOD FOR THE PRODUCTION OF TRIOXANE FROM FORMALDEHYDE
    16.
    发明专利
    INTEGRATED METHOD FOR THE PRODUCTION OF TRIOXANE FROM FORMALDEHYDE 未知

    公开(公告)号：CA2623573A1

    公开(公告)日：2007-02-15

    申请号：CA2623573

    申请日：2006-08-01

    Applicant: BASF AG

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

    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.

    19.
    发明专利
    未知

    公开(公告)号：DE59907884D1

    公开(公告)日：2004-01-08

    申请号：DE59907884

    申请日：1999-09-21

    Applicant: BASF AG

    Inventor： THEIS GERHARD ,  ADRIAN TILL ,  BESSLING BERND ,  HASSE HANS ,  VANSANT FRANS

    IPC: C07C29/10 ,  C07C29/80 ,  C07C31/20

    Abstract: A process for the distillative recovery of high purity monoethylene glycol from the hydrolysis, product of ethylene oxide by pressure dewatering, preferably in a battery, vacuum dewatering and subsequent purifying distillation, wherein during the vacuum dewatering an aqueous stream is withdrawn which contains-monoethylene glycol in a concentration below 1% by weight, preferably below 0.1% by weight, medium boilers and low boilers. The withdrawn aqueous stream is, optionally after further workup, removed from the system.

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