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    82.
    发明专利
    未知

    公开(公告)号：AT516282T

    公开(公告)日：2011-07-15

    申请号：AT08804546

    申请日：2008-09-22

    Applicant: BASF SE

    Inventor： SIEGERT MARKUS ,  LANG NEVEN ,  SZARVAS LASZLO ,  SIGWART CHRISTOPH ,  WINDLIN FRANZ NIKLAUS ,  STROEFER ECKHARD

    IPC: C07D323/06 ,  B01D3/14

    Abstract: A process for separating trioxane from a feed stream I comprising formaldehyde, trioxane and water, in which a) a feed stream I comprising formaldehyde as main component and trioxane and water as secondary components is provided, b) the feed stream I, a recycle stream V and a recycle stream VII comprising formaldehyde as main component and water and trioxane as secondary components are fed into a first distillation stage and distilled at a pressure of from 0.1 to 2.5 bar to give a stream II comprising formaldehyde as main component and water as secondary component and a stream III comprising trioxane as main component and water and formaldehyde as secondary components and a stream X comprising water, trioxane and formaldehyde, c) the stream III is, if appropriate after removal of low boilers from the stream III in a low boiler removal stage, distilled in a second distillation stage at a pressure of from 0.2 to 17.5 bar, with the pressure in the second distillation stage being from 0.1 to 15 bar higher than the pressure in the first distillation stage, to give a stream IV consisting essentially of trioxane and the recycle stream V comprising trioxane as main component and water and formaldehyde as secondary components, c1) the stream IV is purified in at least one further trioxane distillation stage at a pressure at the top of from 0.5 to 2 bar to give purified trioxane as side offtake stream XII in the enrichment section of the column, d) the stream X and, if appropriate, a stream IX comprising water as main component are fed into a third distillation stage and distilled at a pressure of from 1 to 10 bar to give a stream VI consisting essentially of water and a recycle stream VII comprising formaldehyde as main component and water and trioxane as secondary components, is described.

    87.
    发明专利
    未知

    公开(公告)号：AT489376T

    公开(公告)日：2010-12-15

    申请号：AT06793286

    申请日：2006-09-06

    Applicant: BASF SE

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

    IPC: C07D317/12

    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.

    90.
    发明专利
    未知

    公开(公告)号：AT483676T

    公开(公告)日：2010-10-15

    申请号：AT04716587

    申请日：2004-03-03

    Applicant: BASF SE

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

    IPC: C07C45/83 ,  C07C45/00 ,  C07C45/82 ,  C07C47/04 ,  C07C47/058

    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.

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