公开(公告)号：CA2427710C

公开(公告)日：2009-12-22

申请号：CA2427710

申请日：2001-10-04

Applicant: DEGUSSA

Inventor： CREUTZ MATTHIAS ,  MOLLER ROLF-DIETER ,  GLENNEBERG JURGEN ,  WAGNER RUDOLF ,  NORDHOFF STEFAN

IPC: B01D9/02 ,  C01B15/013

Abstract: The invention is directed towards a process for the concentration of aqueous hydrogen peroxide, comprising discontinuous crystallisation. According to th e invention, a cooling surface arranged in a crystallising vessel and first wetted with hydrogen peroxide is cooled at a high cooling rate, whereupon se ed crystals form. The cooling rate is at least 1 K/s, preferably from 10 to 30 K/s. When the vessel has been filled with H2O2 starting material, the latter crystallises, starting from the seed crystals, and forms a crystal layer. Wh en the mother liquor of lower H2O2 concentration has been discharged, there follows a sweating operation with a slow increase in temperature, as a resul t of which the H2O2 concentration in the crystal layer is increased further.

公开(公告)号：CA2427710A1

公开(公告)日：2002-05-10

申请号：CA2427710

申请日：2001-10-04

Applicant: DEGUSSA

Inventor： CREUTZ MATTHIAS ,  GLENNEBERG JURGEN ,  WAGNER RUDOLF ,  NORDHOFF STEFAN ,  MOLLER ROLF-DIETER

IPC: B01D9/02 ,  C01B15/013

Abstract: The invention is directed towards a process for the concentration of aqueous hydrogen peroxide, comprising discontinuous crystallisation. According to the invention, a cooling surface arranged in a crystallising vessel and first wetted with hydrogen peroxide is cooled at a high cooling rate, whereupon seed crystals form. The cooling rate is at least 1 K/s, preferably from 10 to 30 K/s. When the vessel has been filled with H2O2 starting material, the latter crystallises, starting from the seed crystals, and forms a crystal layer. When the mother liquor of lower H2O2 concentration has been discharged, there follows a sweating operation with a slow increase in temperature, as a result of which the H2O2 concentration in the crystal layer is increased further.

公开(公告)号：CA1102805A

公开(公告)日：1981-06-09

申请号：CA336964

申请日：1979-10-04

Applicant: DEGUSSA

Inventor： GOEDECKE RALF ,  KURANDT UWE ,  MOLLER ROLF-DIETER

IPC: C07D251/28

Abstract: The present invention provides a process for producing solid cyanuric chloride by spraying liquid cyanuric chloride in the presence of a coolant, in which liquid cyanuric chloride is sprayed into a separating chamber by a first spraying device while a liquid coolant is also sprayed simultaneously with the cyanuric chloride by a second spraying device separate from the first spraying device, the solidified cyanuric chloride is removed from the separating chamber and the coolant obtained which is now gaseous and contains cyanuric chloride is discharged from the lower end of the separating chamber.