公开(公告)号：AT518574T

公开(公告)日：2011-08-15

申请号：AT08708109

申请日：2008-01-23

Applicant: BASF SE

Inventor： LANG NEVEN ,  THIEL JOACHIM ,  STROEFER ECKHARD ,  KIRSCHBAUM JULIA ,  SIEGERT MARKUS

IPC: B01D3/14 ,  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 which comprises formaldehyde as the main component and trioxane and water as the secondary components, b) feeding the use stream I, a recycle stream V and a recycle stream VII which comprises formaldehyde as the main component and water and trioxane as the secondary components into a first distillation stage and distilling to obtain a stream II a steam III and formaldehyde as the and a steam X c) distilling the stream III, in a second distillation stage the pressure in the second distillation stage being from 0.1 to 15 bar higher than the pressure in the first distillation stage, to obtain a stream IV and the recycle stream V as the secondary components, d) feeding the stream X and if appropriate a stream IX into a third distillation stage and distilling at a pressure of from 1 to 10 bar to obtain a stream VI which consists substantially of water and a recycle stream VII which comprises formaldehyde as the main component and water and trioxane as the secondary components.

公开(公告)号：BRPI0808459A2

公开(公告)日：2014-07-15

申请号：BRPI0808459

申请日：2008-01-23

Applicant: BASF SE

Inventor： LANG NEVEN ,  THIEL JOACHIM ,  STROEFER ECKHARD ,  KIRSCHBAUM JULIA ,  SIEGERT MARKUS

IPC: B01D3/14 ,  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 which comprises formaldehyde as the main component and trioxane and water as the secondary components, b) feeding the use stream I, a recycle stream V and a recycle stream VII which comprises formaldehyde as the main component and water and trioxane as the secondary components into a first distillation stage and distilling to obtain a stream II a steam III and formaldehyde as the and a steam X c) distilling the stream III, in a second distillation stage the pressure in the second distillation stage being from 0.1 to 15 bar higher than the pressure in the first distillation stage, to obtain a stream IV and the recycle stream V as the secondary components, d) feeding the stream X and if appropriate a stream IX into a third distillation stage and distilling at a pressure of from 1 to 10 bar to obtain a stream VI which consists substantially of water and a recycle stream VII which comprises formaldehyde as the main component and water and trioxane as the secondary components.

公开(公告)号：PL2114544T3

公开(公告)日：2011-12-30

申请号：PL08708109

申请日：2008-01-23

Applicant: BASF SE

Inventor： LANG NEVEN ,  THIEL JOACHIM ,  STROEFER ECKHARD ,  KIRSCHBAUM JULIA ,  SIEGERT MARKUS

IPC: B01D3/14 ,  C07D323/06

公开(公告)号：CA2673572A1

公开(公告)日：2008-07-31

申请号：CA2673572

申请日：2008-01-23

Applicant: BASF SE

Inventor： KIRSCHBAUM JULIA ,  STROEFER ECKHARD ,  SIEGERT MARKUS ,  THIEL JOACHIM ,  LANG NEVEN

IPC: B01D3/14 ,  C07D323/06

Abstract: The invention relates to a method for separating trioxane from an inlet f low (I) consisting of formaldehyde, trioxane and water. Said method consists in a) preparing an inlet flow (I), which contains formaldehyde as the main component and trioxane and water as auxiliary components, b) feeding the inl et flow (I), a return flow (V) and a return flow (VII), containing formaldeh yde as the main component and trioxane and water auxiliary components, into a first distillation step and distilling it at a pressure of between 0.1 to 2.5 bars, thus enabling a flow (II), which contains formaldehyde as the main component and water as the auxiliary component, and a flow (III), which con tains trioxane as the main component and water and formaldehyde as the auxil iary components, and a flow (X), which contains water, trioxane and formalde hyde to be obtained, c) distilling the flow (III), optionally after separati ng materials at a low-boiling point from the flow (III) in a low-boiling sep aration step and in a second distillation step at a pressure of between 0.2 to 17. 5 bars, whereby the pressure in the second distillation step is 0.1 t o 15 bars higher that the pressure in the first distillation step. A flow (I V) is obtained which is essentially made of trioxane, and also a return flow (V), which contains trioxane as the main component and water and formaldehy de as the auxiliary components, d) feeding the flow (X) and optionally a flo w (IX), which contains water as the main component, into a third distillatio n step and distilling it at a pressure of between 1 to 10 bars, whereby a fl ow (VI), which is essentially made of water, and a return flow (VII), which contains formaldehyde as the main component and water and trioxane as the au xiliary components, are obtained.