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    61.
    发明专利
    未知

    公开(公告)号：NO20054345L

    公开(公告)日：2005-09-26

    申请号：NO20054345

    申请日：2005-09-20

    Applicant: BASF AG

    Inventor： HASSE HANS ,  STROEFER ECKHARD ,  GRUETZNER THOMAS

    IPC: C07C45/78 ,  C07C45/82 ,  C07C47/058

    Abstract: Method of stabilizing high-concentration formaldehyde solutions having a CH 2 O content of >70% by weight against precipitation of solids, which comprises heating the high-concentration formaldehyde solution at a heating rate of at least 5° C./min to a temperature of from 80° C. to 200° C. immediately after it has been prepared and storing it at a temperature in this range.

    62.
    发明专利
    未知

    公开(公告)号：DE102004001456A1

    公开(公告)日：2005-08-11

    申请号：DE102004001456

    申请日：2004-01-08

    Applicant: BASF AG

    Inventor： KNOESCHE CARSTEN ,  SOHN MARTIN ,  PENZEL ULRICH ,  PALLASCH HANS-JUERGEN ,  GEORGI GUNTER ,  MACKENROTH WOLFGANG ,  SCHWARZ HANS VOLKMAR ,  MAIXNER STEFAN ,  MOLZ GERALD ,  STROEFER ECKHARD

    IPC: C07C209/84 ,  C07C211/50

    Abstract: The invention relates to a process for distillatively preparing TDA from a reactant stream comprising TDA, high boilers and low boilers in a dividing wall column in which a dividing wall is disposed in the longitudinal direction of the column to form an upper combined column region ( 2 ), a lower combined column region ( 3 ), a feed section ( 4 ) having a rectifying section ( 5 ) and stripping section ( 6 ), and also a withdrawal section ( 7 ) having a rectifying section ( 9 ) and stripping section ( 8 ), which comprises the following steps: a. feeding the reactant stream ( 13 ) into the feed section ( 4 ) of the dividing wall column ( 1 ); b. drawing off a low boiler fraction via the top of the column ( 11 ); c. drawing off TDA via a side draw ( 14 ) in the withdrawal section ( 7 ) of the dividing wall column ( 1 ); d. drawing off a low boiler fraction via the bottom of the column ( 12 ).

    63.
    发明专利
    未知

    公开(公告)号：DE10361516A1

    公开(公告)日：2005-07-28

    申请号：DE10361516

    申请日：2003-12-23

    Applicant: BASF AG

    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.

    Method for separating trioxane from a mixture containing trioxane, formaldehyde and water
    64.
    发明专利
    Method for separating trioxane from a mixture containing trioxane, formaldehyde and water 未知

    公开(公告)号：AU2004308627A1

    公开(公告)日：2005-07-14

    申请号：AU2004308627

    申请日：2004-12-21

    Applicant: BASF AG

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

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

    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.

    68.
    发明专利
    未知

    公开(公告)号：DE10309289A1

    公开(公告)日：2004-09-16

    申请号：DE10309289

    申请日：2003-03-04

    Applicant: BASF AG

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

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

    Abstract: Process for preparing high-concentration formaldehyde solutions having a CH 2 O content of >=50% by weight from an aqueous formaldehyde solution having a lower CH 2 O content by evaporation of part of this solution (partial evaporation), in which the aqueous formaldehyde solution is heated to an evaporation temperature T at which the gas phase becomes enriched in water relative to the liquid phase and the gas phase formed is taken off continuously or discontinuously, wherein the evaporation temperature T obeys the relationship: T[° C.] max [° C.] where T max (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.

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