Classifications

• • C—CHEMISTRY; METALLURGY
  • C01—INORGANIC CHEMISTRY
  • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
  • C01B15/00—Peroxides; Peroxyhydrates; Peroxyacids or salts thereof; Superoxides; Ozonides
  • C01B15/04—Metal peroxides or peroxyhydrates thereof; Metal superoxides; Metal ozonides; Peroxyhydrates thereof
  • C01B15/043—Metal peroxides or peroxyhydrates thereof; Metal superoxides; Metal ozonides; Peroxyhydrates thereof of alkali metals, alkaline earth metals or magnesium or beryllium or aluminium
• • C—CHEMISTRY; METALLURGY
  • C05—FERTILISERS; MANUFACTURE THEREOF
  • C05D—INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE
  • C05D3/00—Calcareous fertilisers

Definitions

• the invention relates to homogeneous boron-doped alkaline earth peroxides, their preparation and use.
• alkaline earth peroxides such as B. calcium or magnesium peroxide as an oxygen source in aerobic processes such as in the treatment of biowaste, in soil remediation ("in situ bioremediation") or in wastewater treatment. Furthermore, the use of calcium peroxide for agricultural purposes, in particular for direct sowing, is known.
• a calcium / magnesium peroxide improves the cultivation performance with regard to germination, seedling formation and the initial growth of the plants.
• the seeds are usually aces with a Pilier, which in addition to the oxygen supply means such.
• B. contains active ingredients, nutrients, bentonite, etc. treated. The individual components of this mixture are mixed together and then the seeds are mixed with this mixture.
• Sodium perborate is usually described as the oxygen supply agent, which, as a water-soluble compound, can provide both oxygen and, in addition, the boron essential for plant growth.
• sodium perborate should be the suitable oxygen supply agent because of this bifunctionality (oxygen release and boron content)
• considerable problems can be expected from a process engineering point of view when using sodium perborate in the pilating process: due to the high water solubility of sodium perborate, there is a risk that the hydrogen peroxide released in the piliering process will easily Oxidizable components from the pilier mass react, whereby on the one hand the available oxygen is restricted and on the other hand the desired effectiveness of the pilier mass is reduced.
• the object is achieved by the provision of homogeneous boron-doped alkaline earth peroxides or mixed peroxides, in particular boron-doped calcium peroxide, as well as their simple preparation and the appropriate use.
• the homogeneous boron-doped alkaline earth peroxide according to the invention with a peroxide content of greater than 80%, preferably approx. 75% calculated from the active oxygen content, can be produced in a simple manner by adding a suitable boron source as a further starting material in conventional processes for the production of alkaline earth peroxide or by using the appropriate alkaline earth peroxide suspension with the Boron source.
• Metaborate lye or boric acid in particular is used as a suitable boron source.
• the invention also relates to a method for producing homogeneous boron-doped alkaline earth mixed peroxides, in particular homogeneous boron-doped calcium / magnesium peroxides.
• homogeneous calcium / magnesium peroxide is brought into contact with a boron source.
• the homogeneous calcium / magnesium peroxide is produced by the process according to DE 196 50 686, in which an aqueous solution or a suspension of calcium hydroxide and magnesium oxide and / or magnesium hydroxide is reacted with an aqueous hydrogen peroxide solution at a temperature below 60 ° C.
• This calcium / magnesium peroxide suspension is brought into contact with the boron source. It is also within the scope of the invention to first obtain the calcium / magnesium mixed peroxide as a solid reaction product and then to produce a calcium / magnesium peroxide suspension in which the boron compound is then introduced.
• the invention also relates to a process for producing the homogeneous boron-doped calcium peroxide, which is characterized in that a calcium peroxide suspension is mixed with stirring with metaborate lye or boric acid and a 30 to 70% by weight aqueous hydrogen peroxide solution.
• an aqueous suspension of calcium hydroxide and metaborate liquor is reacted with an aqueous hydrogen peroxide solution.
• Calcium peroxide suspensions with a solids content of 250 to 400 g / l are preferably used and sodium metaborate lye or aqueous, saturated boric acid solution are added with stirring.
• the boron solution addition amounts depend on the boron content that the end product should have.
• the boron-doped calcium peroxide is dried in a spray dryer at an exhaust air temperature of 120 ° C and can be packaged in the desired manner or formulated with the usual components for seed treatment.
• the homogeneous boron-doped calcium peroxide produced according to the invention is distinguished by a boron content of 0.5 to 5% by weight of boron and has a calcium peroxide content of ⁇ 75% (calculated from the active oxygen content).
• the boron-doped calcium peroxide can contain small amounts of additives and / or stabilizers customary for per compounds.
• additives are e.g. B. water glass or active oxygen stabilizers such as phosphonic acids and their salts.
• the product according to the invention has advantageous stability properties compared to sodium perborate.
• the loss of dry stability (2 h at 105 ° C, see regulation 1) is below 10% and the loss of wet stability (20 min. At 90 ° C, see regulation 2) is below 10%.
• the homogeneous boron-doped calcium peroxide according to the invention is notable for a number of advantages.
• a boron-doped calcium peroxide is provided in the form of the very finely divided target product (grain diameter ⁇ 50 ⁇ m), in which the boron component is almost ideally and homogeneously distributed due to the process. When used later in the piling process, segregation of the boron and calcium peroxide components is therefore ruled out.
• the boron-doped calcium peroxide also fulfills the function of the required boron source.
• a calcium peroxide suspension of the following composition is placed in a reaction container:
• the amount of sodium metaborate added depends on the desired boron content in the end product.
• the amount of hydrogen peroxide added is chosen so that more than 1 mole of hydrogen peroxide is added per mole of boron.
• the reaction product is dried in a spray dryer at 17,000 rpm, 400 ° C supply air temperature, 120 ° C exhaust air temperature.
• the amount of boron required for the target product in the form of a saturated boric acid solution is added to the calcium peroxide suspension according to the example above.
• the boron-doped calcium peroxide is worked up in a known manner.
• the stability of the homogeneous boron-doped peroxides at elevated temperature is determined by the loss of active oxygen. Both the wet stability and the dry stability of the boron-doped peroxides were determined.
• the loss in stability in% is the recovered active oxygen content based on the original oxygen content.

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• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Inorganic Chemistry (AREA)
• Life Sciences & Earth Sciences (AREA)
• General Life Sciences & Earth Sciences (AREA)
• Geology (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Agricultural Chemicals And Associated Chemicals (AREA)
• Oxygen, Ozone, And Oxides In General (AREA)

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• 2001
  • 2001-08-21 DE DE10140858A patent/DE10140858A1/de not_active Withdrawn
• 2002
  • 2002-07-03 WO PCT/EP2002/007334 patent/WO2003018470A1/de not_active Application Discontinuation
  • 2002-07-03 EP EP02767168A patent/EP1421027A1/de not_active Withdrawn
  • 2002-07-03 BR BRPI0211893-9A patent/BR0211893B1/pt not_active IP Right Cessation
  • 2002-07-03 CA CA2457884A patent/CA2457884C/en not_active Expired - Fee Related
• 2004
  • 2004-02-20 US US10/781,855 patent/US7425228B2/en not_active Expired - Fee Related

Non-Patent Citations (1)

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