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Spraying
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Powders and Granules
Free-flowing powders and granulates are needed for a variety of industrial processes. These, however, do not always meet the exacting standards which modern manufacturing demands of them due to their varying grain size distribution and odd shapes.
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Dispersion in liquids
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These properties are
detrimental to efficient processing and lead to agglomeration,
inexact dosage, abrading with loss of material or low
reproducibility of castings. Pharmaceutical applications
require highly reproducible dosage and the controlled release
of active agents and this can not be achieved with conventional
powders and granulates.
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BRACE Microspheres
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The solution to these Problems
The use of small and perfectly round
Microspheres with exactly the same size circumvents all of the
disadvantages that are encountered while using powders and
granulates. These Microspheres are free flowing and roll with
practically no friction, that means there is no abrasion
guaranteeing a dust free environment. Pharmaceuticals embedded
in the Microsphere matrix are released continuously and at a
constant rate.
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Production Unit
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Ultra Spherical Microspheres
Microspheres with
a monodisperse grain size distribution and the smallest divergence
are manufactured by BRACE:
- perfectly spherical Microspheres
- monodisperse grain size, narrow size distribution with diameters between 50µm and 5000µm
- non abrading therefore dust free
- free flowing, porous, large surface area, soft or rigid
- for embedding pharmaceuticals, bacteria, enzymes or other heterogeneous catalysts with or without coating
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The BRACE-Process
A liquid
is gently pumped through a vibrating nozzle system where upon
exiting the fluid stream breaks up into uniform droplets.
The surface tension of these droplets moulds them into perfect
spheres in which gelation is induced during a short period of
free fall. Solidification can be induced in a gaseous and/or
liquid medium through cooling, drying or chemical reaction.
There are no constraints on the type of liquid - i.e.
molten material, solutions, dispersions, sols or suspensions
can be used to manufacture perfectly spherical Microspheres.
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101fold Nozzle head
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Types of Production Facilities and Services
BRACE designs, constructs
and installs Microsphere production units from the laboratory
scale up to full size production plants. Throughput and exact
price of the production units vary with the size of the
Microspheres and the complexity involved in the solidification
process. Laboratory units as the desktop unit Spherisator 2002 are avilable
under 50,000 EUR. Pilot- and production unit with capacities
from a few kg/h to over 10,000 L/h are available, too.
Additionally BRACE also stocks a
series of standard Microspheres and is able to produce
Microspheres according to customer specifications.
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Reaction and washing of spheres
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Processing Characteristics
A monodispersive grain size distribution can
only be obtained with a constant laminar flow through the
nozzle. Amplitude and frequency of the nozzle oscillation are
held constant by a closed loop control circuit but both can be
varied to a degree to influence the grain size. Both must be
held constant during a production run. Microsphere
production units have a minimal space requirement (15 to
40sq.feet), their energy consumption is very low and they are
noiseless during operation. These units operate at atmospheric
pressure or slightly above and can be designed to be explosion
proof according to the GLP/ GMP guide lines. Microsphere
production units from BRACE need practically no
maintenance, therefor only a minimal staff is required. Units
with fully automated controls and remote monitoring can be
delivered as an option.
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Producttypes
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Types of Microspheres
There are very few restrictions on the types
of Microspheres than can be produced. Through the right
combination of liquid precursor, soldification process and
subsequent treatments a wide variety of Microspheres can be
produced.
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Dry
metal oxide Microspheres produced on the basis of a
sol (Al2O3, ZrO2, HfO2,
TiO2,
CeO4, SiO2, and mixed oxides) can be used
as highly sinteractive press-feed for the production of
high-tech ceramics. Through calcining the pore size and surface
area of the Microspheres can be tailored within the exacting
specifications. These Microspheres make excellent catalyst
carriers, homogenous catalysts or filtering materials. Unusually
effective and abrasion resistant Microspheres for grinding
other materials are made from sintered Al, Zr and Hf-oxides.
Microspheres
produced from molten materials (inorganic, organic, alloys and
polymers) can be used for dosing, proportioning, compounding,
colouring and light stabilization. Microspheres with dissolved
or embedded active agents, with or without coating, are used
for numerous pharmaceutical and cosmetic products.
Soluble
chemical compounds can be incorporated into Microspheres by
precipitation for use in agricultural, food, pharmaceutical
and cosmetics industries.
Suspensions are used to produce Microspheres with embedded enzymes or bacteria.
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Aktualisiert Montag, 29. Dezember 2008 |
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