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    12.
    发明专利
    未知

    公开(公告)号：ES2140143T3

    公开(公告)日：2000-02-16

    申请号：ES96939035

    申请日：1996-11-14

    Applicant: DEGUSSA

    Inventor： SCHUTTE RUDIGER ,  BEWERSDORF MARTIN ,  KLASEN CLAAS-JURGEN

    IPC: C01B15/10 ,  C11D3/02 ,  C11D3/08 ,  C11D3/39 ,  C11D17/00

    Abstract: In order to increase active oxygen stability, sodium percarbonate is coated with single or multiple layers of various substances. Sodium percarbonate particles consist of a core of sodium percarbonate fluidized bed spray granulate and sodium sulphate, which may be partially hydrated, as the sole constituent of a single coating layer. The particles exhibit both elevated active oxygen stability and very good ensilability. The coating layer is applied by spraying an aqueous Na2SO4 solution onto the particles to be coated, which were themselves produced by fluidized bed spray granulation, in a fluidized bed and vaporizing water at a fluidized bed temperature of 35 to 100 DEG C.

    13.
    发明专利
    未知

    公开(公告)号：ES2113102T3

    公开(公告)日：1998-04-16

    申请号：ES94915106

    申请日：1994-04-23

    Applicant: DEGUSSA

    Inventor： BERTSCH-FRANK BIRGIT ,  BEWERSDORF MARTIN ,  KLASEN CLAAS-JURGEN ,  LIESER THOMAS ,  MULLER KLAUS ,  ROLLMANN JURGEN

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

    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.

    17.
    发明专利
    未知

    公开(公告)号：TR199701209T1

    公开(公告)日：1998-02-21

    申请号：TR9701209

    申请日：1996-04-03

    Applicant: DEGUSSA

    Inventor： SCHUTTE RUDIGER ,  KLASEN CLAAS-JURGEN ,  BEWERSDORF MARTIN ,  ALT HANS-CHRISTIAN

    IPC: B01D1/18 ,  B01J2/04 ,  B01J2/16 ,  C01B15/10 ,  C01D7/38

    Abstract: PCT No. PCT/EP96/01453 Sec. 371 Date Sep. 26, 1997 Sec. 102(e) Date Sep. 26, 1997 PCT Filed Apr. 3, 1996 PCT Pub. No. WO96/33009 PCT Pub. Date Oct. 24, 1996This invention relates to a process for the production of granulates by fluidized bed spray granulation and to a device for this purpose. Liquid starting materials may be converted into granulates by fluidized bed spray granulation. In order to ensure elevated material throughput, numerous nozzles, which are moreover susceptible to plugging and encrustation, must be installed. The disadvantages of known processes may be overcome according to the invention by arranging at least two spray nozzles at least partially directed towards each other in such a manner and the quantity of spray is adjusted in such a manner that their spray jets collide within the fluidized bed and substantially no liquid strike-through occurs onto a surface delimiting the fluidized bed or out of the fluidized bed. The spray jets of two spray nozzles directed towards each other collide frontally or enclose an angle of less than 180 DEG ; the angle is preferably between 150 DEG and 180 DEG . The device according to the invention comprises a flow channel (1) with laterally arranged spray nozzles (8), wherein in each case two exactly opposing or staggered spray nozzles are oriented in such a manner that the spray jets collide within the fluidized bed. Sodium percarbonate production is exemplfied.

    19.
    发明专利
    未知

    公开(公告)号：ES2106515T3

    公开(公告)日：1997-11-01

    申请号：ES94909085

    申请日：1994-02-28

    Applicant: DEGUSSA

    Inventor： BERTSCH-FRANK BIRGIT ,  KLASEN CLAAS-JURGEN ,  LIESER THOMAS ,  MULLER 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.

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