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    11.
    发明专利
    未知

    公开(公告)号：BRPI0417859A

    公开(公告)日：2007-04-27

    申请号：BRPI0417859

    申请日：2004-12-21

    Applicant: BASF AG

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

    IPC: B01D3/36 ,  B01D3/14 ,  C07D323/06

    Abstract: A process for removing trioxane from a mixture I of formaldehyde, trioxane and water, by a) distilling the mixture I in a first distillation stage at a pressure of from 0.1 to 2 bar to obtain a stream II which comprises formaldehyde and a stream III which comprises predominantly trioxane and additionally water and formaldehyde, b) mixing the stream III with a recycle stream VII which comprises predominantly trioxane and additionally water and formaldehyde to obtain a stream IIIa which comprises predominantly trioxane and additionally water and formaldehyde, c) distilling the stream IIIa, if appropriate after removing low boilers from the stream III or IIIa in a further distillation stage, in a second distillation stage at a pressure of from 0.2 to 10 bar, the pressure in the second distillation stage being at least 0.1 bar higher than the pressure in the first distillation stage, to obtain a stream IV of trioxane and a stream V which comprises predominantly trioxane and additionally water and formaldehyde, d) distilling the stream V in a third distillation stage at a pressure of from 0.1 to 4 bar to obtain a stream VI which comprises predominantly water and additionally formaldehyde, and the recycle stream VII which comprises predominantly trioxane and additionally water and formaldehyde, e) if appropriate, distilling the stream VI in a fourth distillation stage to obtain a stream VIII which comprises predominantly water, and a stream IX which comprises predominantly formaldehyde.

    12.
    发明专利
    未知

    公开(公告)号：DE102005036544A1

    公开(公告)日：2007-02-15

    申请号：DE102005036544

    申请日：2005-08-03

    Applicant: BASF AG

    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, comprising the steps of: a) 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 and allowed to react to obtain a product stream A 2 comprising trioxane, water and formaldehyde; b) stream A 2 is fed to a first low-pressure distillation column and distilled at a pressure of from 0.1 to 2.5 bar to obtain a stream B 1 enriched in trioxane and additionally comprising water and formaldehyde, and the recycle stream B 2 consisting substantially of formaldehyde and water; c) stream B 1 and a recycle stream D 1 comprising trioxane, water and formaldehyde are fed to a second low-pressure distillation column and distilled at a pressure of from 0.1 to 2.5 bar to obtain a stream C 1 comprising predominantly trioxane and additionally formaldehyde and water, and a stream C 2 consisting substantially of formaldehyde and water; d) stream C 1 is fed to a high-pressure distillation column and distilled at a pressure of from 0.2 to 17.5 bar to obtain the recycle stream D 1 and a product stream D 2 consisting substantially of trioxane, in which a removal of the low boilers present in streams B 1 or C 1 may be undertaken between steps b) and c) or c) and d).

    14.
    发明专利
    未知

    公开(公告)号：DE10361518A1

    公开(公告)日：2005-07-28

    申请号：DE10361518

    申请日：2003-12-23

    Applicant: BASF AG

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

    IPC: B01D3/14 ,  B01D3/36 ,  C07D323/06

    Abstract: A process for removing trioxane from a mixture I of formaldehyde, trioxane and water, by a) distilling the mixture I in a first distillation stage at a pressure of from 0.1 to 2 bar to obtain a stream II which comprises formaldehyde and a stream III which comprises predominantly trioxane and additionally water and formaldehyde, b) mixing the stream III with a recycle stream VII which comprises predominantly trioxane and additionally water and formaldehyde to obtain a stream IIIa which comprises predominantly trioxane and additionally water and formaldehyde, c) distilling the stream IIIa, if appropriate after removing low boilers from the stream III or IIIa in a further distillation stage, in a second distillation stage at a pressure of from 0.2 to 10 bar, the pressure in the second distillation stage being at least 0.1 bar higher than the pressure in the first distillation stage, to obtain a stream IV of trioxane and a stream V which comprises predominantly trioxane and additionally water and formaldehyde, d) distilling the stream V in a third distillation stage at a pressure of from 0.1 to 4 bar to obtain a stream VI which comprises predominantly water and additionally formaldehyde, and the recycle stream VII which comprises predominantly trioxane and additionally water and formaldehyde, e) if appropriate, distilling the stream VI in a fourth distillation stage to obtain a stream VIII which comprises predominantly water, and a stream IX which comprises predominantly formaldehyde.

    15.
    发明专利
    未知

    公开(公告)号：DE10309288A1

    公开(公告)日：2004-09-16

    申请号：DE10309288

    申请日：2003-03-04

    Applicant: BASF AG

    Inventor： STROEFER ECKHARD ,  LANG NEVEN ,  STEINBRENNER ULRICH ,  HASSE HANS ,  OTT MICHAEL ,  GRUETZNER THOMAS

    IPC: C07C45/00 ,  C07C45/82 ,  C07C47/058 ,  C02F1/08

    Abstract: Process for preparing high-concentration gaseous formaldehyde having a molar CH 2 O:H 2 O ratio of >=0.6 from an aqueous formaldehyde solution by evaporation of at least part of the solution, in which the aqueous formaldehyde solution is heated to a vaporization temperature T and the gas phase formed is taken off, wherein the evaporation temperature T obeys the relationship: T[° C.]>=T' min [° C.] where T' min (c)=A+Bx(c/100)+Cx(c/100) 2 +Dx(c/100) 3 and A=+68.759, B=+124.77, C=-12.851, D=-10.095, where c is the instantaneous CH 2 O content of the aqueous formaldehyde solution during the evaporation in percent by weight and is from 20 to 99% by weight.

    17.
    发明专利
    未知

    公开(公告)号：NO20080303L

    公开(公告)日：2008-02-29

    申请号：NO20080303

    申请日：2008-01-16

    Applicant: BASF AG

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

    IPC: C07D323/06

    Abstract: The invention relates to an integrated process for preparing trioxane from formaldehyde in which a stream A1 comprising water and formaldehyde and a recycle stream B2 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 A2 comprising trioxane, water and formaldehyde; stream A2 is 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 B1 enriched in trioxane, and the stream B2 consisting substantially of water and formaldehyde; stream B1 and a recycle stream D1 comprising trioxane, water and formaldehyde are 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 C2 consisting substantially of trioxane, and a stream C1 comprising trioxane, water and formaldehyde; stream C1 is fed to a third distillation column and distilled at a pressure in the range from 0.1 to 2.5 bar to obtain the recycle stream D1 comprising trioxane, water and formaldehyde, and a stream D2 consisting substantially of water and formaldehyde.

    19.
    发明专利
    未知

    公开(公告)号：NO20080315L

    公开(公告)日：2008-02-27

    申请号：NO20080315

    申请日：2008-01-18

    Applicant: BASF AG

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

    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.

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