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.

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.

公开(公告)号：DE10295499D2

公开(公告)日：2004-10-28

申请号：DE10295499

申请日：2002-11-28

Applicant: BASF AG

Inventor： STROEFER ECKHARD ,  ARMBRUSTER HARALD ,  EGBERS GITTA ,  FREYHOF REINHARD ,  FRIESE THORSTEN ,  HECK LUDWIG E ,  HILDENBRAND PETER ,  ZEINER HARTMUT ,  SCHOLL STEPHAN ,  GOERTZ HANS-HELMUT

IPC: C08G2/08 ,  C08G4/00

公开(公告)号：AU2003232760A1

公开(公告)日：2003-12-02

申请号：AU2003232760

申请日：2003-05-13

Applicant: BASF AG

Inventor： FRIESE KATRIN ,  RAULS MATTHIAS ,  FREYHOF REINHARD ,  FRIESE THORSTEN ,  ARMBRUSTER HARALD ,  ZEINER HARTMUT ,  EGBERS GITTA ,  STROFER ECKHARD ,  HECK LUDWIG ,  HILDENBRAND PETER

IPC: C07D323/06

Abstract: Production of trioxane by trimerization of formaldehyde in aqueous acid solution followed by separation of trioxane from a crude trioxane product mixture of trioxane, water and formaldehyde comprises: distillation of the crude trioxane; crystallization of the trioxane and; separation from the mother liquor followed by melting and distillation of other byproducts. A process for the production of trioxane by trimerization of formaldehyde in aqueous acid solution followed by separation of trioxane from a crude trioxane product mixture of trioxane, water and formaldehyde comprises: (a) distillation of the crude trioxane; (b) crystallization of the trioxane and; (c) separation from the mother liquor followed by; (d) melting and; (e) distillation of other byproducts.

公开(公告)号：DE10158813A1

公开(公告)日：2003-06-12

申请号：DE10158813

申请日：2001-11-30

Applicant: BASF AG

Inventor： STROEFER ECKHARD ,  ARMBRUSTER HARALD ,  EGBERS GITTA ,  FREYHOF REINHARD ,  FRIESE THORSTEN ,  HECK LUDWIG E ,  HILDENBRAND PETER ,  ZEINER HARTMUT ,  SCHOLL STEPHAN ,  GOERTZ HANS-HELMUT

IPC: C08G2/08 ,  C08G4/00 ,  C08G2/10

Abstract: According to the invention, the production of oxymethylene homo- or co-polymers from an aqueous solution of formaldehyde and polyoxymethylene glycols is achieved, whereby 1) in a separation stage, water and formaldehyde are at least partly separated out from the aqueous solution, such that a phase containing polyoxymethylene glycols is obtained, in which the molar ratio of polyoxymethylene glycols to formaldehyde is greater than 1:0.6 and 2) the polyoxymethylene glycols obtained in stage 1) are reacted in the presence of polycondensation catalysts with abstraction of water to give oxymethylene homo- or co-polymers.