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    2.
    发明专利
    未知

    公开(公告)号：DE59405647D1

    公开(公告)日：1998-05-14

    申请号：DE59405647

    申请日：1994-02-15

    Applicant: DEGUSSA

    Inventor： KLASEN CLAAS-JUERGEN ,  BERTSCH-FRANK BIRGIT ,  LIESER THOMAS ,  SCHUBERT PETER ,  MUELLER KLAUS

    IPC: B01D12/00 ,  C01B15/10 ,  C11D3/39 ,  C11D17/00

    Abstract: PCT No. PCT/EP94/00422 Sec. 371 Date Sep. 28, 1995 Sec. 102(e) Date Sep. 28, 1995 PCT Filed Feb. 15, 1994 PCT Pub. No. WO94/20413 PCT Pub. Date Sep. 15, 1994The invention relates to a method for increasing the storage stability of sodium percarbonate (2 Na2CO3.3 H2O2) by coating with a sodium perborate. According to the present invention wet sodium percarbonate salt, obtained by reacting sodium carbonate with hydrogen peroxide in aqueous phase and separating the salt from the aqueous phase, is treated with a solution or suspension containing sodium perborate in a solid-liquid separator by a kind of displacement wash. In contrast to previously known methods, according to the present invention a greater storage stability is attained with smaller quantities of perborate coating.

    4.
    发明专利
    未知

    公开(公告)号：DE59403562D1

    公开(公告)日：1997-09-04

    申请号：DE59403562

    申请日：1994-02-28

    Applicant: DEGUSSA

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

    IPC: C01B15/10 ,  C02F1/00 ,  C11D3/39 ,  C11D3/395 ,  C11D17/00

    Abstract: PCT No. PCT/EP94/00576 Sec. 371 Date Oct. 2, 1995 Sec. 102(e) Date Oct. 2, 1995 PCT Filed Feb. 28, 1994 PCT Pub. No. WO94/24044 PCT Pub. Date Oct. 27, 1994Sodium percarbonate is often used in the form of coated particles to increase its storage stability in detergents. Sodium percarbonate particles coated in accordance with the invention have a coating containing reaction products from the reaction of a dialkali metal tetraborate or alkali metal pentaborate with aqueous hydrogen peroxide. Preferred coating components are: perborax with the formula Na2B4O7xH2O2, where n =2 or 4. The coated sodium percarbonate particles are produced by coating the percarbonate particles using a solution containing the reaction products mentioned above. Detergent, bleaching and cleaning compositions containing sodium percarbonate particles coated in accordance with the invention are distinguished by very high stability in storage.

    5.
    发明专利
    未知

    公开(公告)号：DE59402931D1

    公开(公告)日：1997-07-03

    申请号：DE59402931

    申请日：1994-04-23

    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

    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.

    6.
    发明专利
    未知

    公开(公告)号：FI960208A

    公开(公告)日：1996-01-16

    申请号：FI960208

    申请日：1996-01-16

    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

    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.

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