KONTINUIERLICHES VERFAHREN ZUR HERSTELLUNG VON NATRIUMPERBORAT-GRANULATEN
Spray-drying of a solution containing hydrogen peroxide and sodium metaborate is known per se; these products are very fine and amorphous, and they show an unsatisfactory storage stability. According to the invention, these disadvantages are eliminated, if the primary particles obtained by spray-dry...
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| creator | BERTSCH-FRANK, BIRGIT MUELLER, KLAUS LIESER, THOMAS |
| description | Spray-drying of a solution containing hydrogen peroxide and sodium metaborate is known per se; these products are very fine and amorphous, and they show an unsatisfactory storage stability.
According to the invention, these disadvantages are eliminated, if the primary particles obtained by spray-drying are, immediately after they have left the drying zone, fed to a granulator device and granulated in the presence of free water and/or water of crystallisation of the perborate and, if necessary, the granules are dried. The generally amorphous primary particles are converted into granules having an at least partially crystalline structure and a significantly improved storage stability. Advantageously, the process is carried out in a spray drier with integrated fluidised bed or in a compacting granulator device. The process is suitable for producing perborate granules with more than 10 % by weight, especially perborate monohydrate granules with 14 - 16 % by weight, of active oxygen. |
| format | Patent |
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According to the invention, these disadvantages are eliminated, if the primary particles obtained by spray-drying are, immediately after they have left the drying zone, fed to a granulator device and granulated in the presence of free water and/or water of crystallisation of the perborate and, if necessary, the granules are dried. The generally amorphous primary particles are converted into granules having an at least partially crystalline structure and a significantly improved storage stability. Advantageously, the process is carried out in a spray drier with integrated fluidised bed or in a compacting granulator device. The process is suitable for producing perborate granules with more than 10 % by weight, especially perborate monohydrate granules with 14 - 16 % by weight, of active oxygen.</description><edition>5</edition><language>ger</language><subject>CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY ; CHEMISTRY ; COMPOUNDS THEREOF ; INORGANIC CHEMISTRY ; METALLURGY ; NON-METALLIC ELEMENTS ; PERFORMING OPERATIONS ; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL ; THEIR RELEVANT APPARATUS ; TRANSPORTING</subject><creationdate>1991</creationdate><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=19910815&DB=EPODOC&CC=AT&NR=E65940T1$$EHTML$$P50$$Gepo$$Hfree_for_read</linktohtml><link.rule.ids>230,309,781,886,25568,76551</link.rule.ids><linktorsrc>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=19910815&DB=EPODOC&CC=AT&NR=E65940T1$$EView_record_in_European_Patent_Office$$FView_record_in_$$GEuropean_Patent_Office$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>BERTSCH-FRANK, BIRGIT</creatorcontrib><creatorcontrib>MUELLER, KLAUS</creatorcontrib><creatorcontrib>LIESER, THOMAS</creatorcontrib><title>KONTINUIERLICHES VERFAHREN ZUR HERSTELLUNG VON NATRIUMPERBORAT-GRANULATEN</title><description>Spray-drying of a solution containing hydrogen peroxide and sodium metaborate is known per se; these products are very fine and amorphous, and they show an unsatisfactory storage stability.
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According to the invention, these disadvantages are eliminated, if the primary particles obtained by spray-drying are, immediately after they have left the drying zone, fed to a granulator device and granulated in the presence of free water and/or water of crystallisation of the perborate and, if necessary, the granules are dried. The generally amorphous primary particles are converted into granules having an at least partially crystalline structure and a significantly improved storage stability. Advantageously, the process is carried out in a spray drier with integrated fluidised bed or in a compacting granulator device. The process is suitable for producing perborate granules with more than 10 % by weight, especially perborate monohydrate granules with 14 - 16 % by weight, of active oxygen.</abstract><edition>5</edition><oa>free_for_read</oa></addata></record> |
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| subjects | CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY CHEMISTRY COMPOUNDS THEREOF INORGANIC CHEMISTRY METALLURGY NON-METALLIC ELEMENTS PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL THEIR RELEVANT APPARATUS TRANSPORTING |
| title | KONTINUIERLICHES VERFAHREN ZUR HERSTELLUNG VON NATRIUMPERBORAT-GRANULATEN |
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