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.

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.

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.

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.

公开(公告)号：ES2293583T3

公开(公告)日：2008-03-16

申请号：ES05750544

申请日：2005-05-17

Applicant: BASF SE

Inventor： SCHWITTAY CLAUDIUS ,  STOCKELMANN ELMAR ,  HEINEMANN JOHANNES ,  ZOLLNER KNUT ,  STAMMER ACHIM

IPC: C08G2/10 ,  C08G2/08 ,  C08J11/02 ,  C08L59/00

Abstract: Procedimiento para la extracción de monómeros residuales no reaccionados de homo- o copolímeros de polioximetileno con los siguientes pasos procedimentales: a) en un dispositivo de desgasificación los monómeros residuales se extraen de los polímeros en forma gaseosa como vapor a una temperatura de 70 a 300°C y una presión de 0, 005 a 50 bares, b) los vapores de monómeros residuales se extraen a través de una línea de vapor, manteniéndose la temperatura del vapor por encima del punto de ebullición, c) los monómeros residuales gaseosos se condensan a partir del vapor en un dispositivo de condensación, caracterizado porque en el paso c) se hace operar al dispositivo de condensación a una presión de 1, 09 a 102, 4 bar y una temperatura de 102 a 230°C, no quedando por debajo de la temperatura mínima de 102°C en ningún punto del dispositivo de condensación, y porque las superficies del dispositivo de condensación, que entran en contacto con el vapor, están recubiertas por una película líquida, que contiene monómeros residuales condensados.

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