公开(公告)号：ZA9405218B

公开(公告)日：1995-02-27

申请号：ZA9405218

申请日：1994-07-15

Applicant: DEGUSSA

Inventor： BERTSCH-FRANK BIRGIT ,  BEWERSDORF MARTIN ,  KLASEN CLAAS-JUERGEN ,  LIESER THOMAS ,  MUELLER KLAUS ,  ROLLMANN JUERGEN

IPC: C01B15/10 ,  C11D3/39 ,  C11D3/395 ,  C11D7/54 ,  C11D17/00 ,  C01B ,  C11D ,  D06L

CPC classification number: C01B15/106 ,  C11D3/3942 ,  C11D17/0039

公开(公告)号：CA2166281A1

公开(公告)日：1995-01-26

申请号：CA2166281

申请日：1994-04-23

Applicant: DEGUSSA

Inventor： ROLLMANN JUERGEN ,  KLASEN CLAAS-JUERGEN ,  BEWERSDORF MARTIN ,  LIESER THOMAS ,  BERTSCH-FRANK BIRGIT ,  MUELLER KLAUS

IPC: C01B15/10 ,  C11D3/39 ,  C11D3/395 ,  C11D7/54 ,  C11D17/00 ,  C01B15/00 ,  D06L3/00

Abstract: In the prior art, sodium percarbonate is coated with compounds which produce a stabilizing action in order to increase the shelf life. There is a need for an improved, boron-free, coating for sodium percarbonate. Proposed by the invention is a particle coating containing sodium carbonate plus one or more optionally partly hydrated magnesium compounds, preferably magnesium sulphate, in a single coat or in separate coats. The coating preferably contains two coats. The particles are produced by spraying aqueous solutions containing the coating compounds on to sodium percarbonate in a fluidized bed and at the same time evaporating off the water. Their long shelf life makes particles coated in this way suitable for use in washing, bleaching and cleaning agents.

公开(公告)号：IL110819D0

公开(公告)日：1994-11-11

申请号：IL11081994

申请日：1994-08-30

Applicant: DEGUSSA

Inventor： BEWERSDORF MARTIN ,  KLASEN CLAAS-JUERGEN ,  LOOK-HERBER PETRA ,  BERTSCH-FRANK BIRGIT ,  LIESER THOMAS ,  MUELLER KLAUS

IPC: B01D1/20 ,  B01J2/04 ,  B01J2/16 ,  B05B7/06 ,  C01B15/10 ,  C01B

Abstract: Sodium percarbonate of the formula 2 Na2CO3 3 H2O2 can be produced by fluidised-bed spray granulation by spraying an aqueous solution of sodium carbonate and a hydrogen peroxide solution on sodium percarbonate seeds and evaporating water. The previously necessary use of phosphorus-containing crystallisation inhibitor to prevent blockages and incrustations in and on the nozzle can be avoided by the invention if the solutions are sprayed using a single three-substance pulverisation nozzle with the external mixing of the solutions.