公开(公告)号：JP2003135903A

公开(公告)日：2003-05-13

申请号：JP2002215214

申请日：2002-07-24

Applicant: BASF AG

Inventor： RAULS MATTHIAS ,  GELDER RICHARD VAN ,  WAGNER KATRIN ,  BERNARD HARALD

IPC: B01D9/02 ,  B01D9/00 ,  C07C403/00 ,  C07C403/08 ,  C07C403/14 ,  C07C403/20

Abstract: PROBLEM TO BE SOLVED: To provide a method for manufacturing crystals of small grain sizes and simultaneously a narrow grain size distribution. SOLUTION: The method for crystallizing the crystals below 100 μm in average grain size comprises performing crystallization by simultaneously using ultrasonic waves to be directly introduced by using a sonotrode into a solution or suspension of a compound to be crystallized and a specific proportional agitation driving power.

公开(公告)号：DE10137017A1

公开(公告)日：2003-02-20

申请号：DE10137017

申请日：2001-07-30

Applicant: BASF AG

Inventor： RAULS MATTHIAS ,  GELDER RICHARD VAN ,  WAGNER KATRIN ,  BERNARD HARALD

IPC: B01D9/02 ,  B01D9/00 ,  C07C403/00 ,  C07C403/08 ,  C07C403/14 ,  C07C403/20 ,  B01J19/10

Abstract: Production of crystals with an average particle size below 100 micro m comprises crystallizing a compound from a solution or suspension while exposing it to ultrasound directly applied through a sonotrode and while maintaining a specific stirring power.

公开(公告)号：DE10222163A1

公开(公告)日：2003-11-27

申请号：DE10222163

申请日：2002-05-17

Applicant: BASF AG

Inventor： WAGNER KATRIN ,  RAULS MATTHIAS ,  FREYHOF REINHARD ,  FRIESE THORSTEN ,  ARMBRUSTER HARALD ,  ZEINER HARTMUT ,  EGBERS GITTA ,  STROEFER ECKHARD ,  HECK LUDWIG E ,  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.