Fritsch Analysette

Dry sieving 63um-63mm Fritsch Analysette 3, (20pm-25mm)... 

Sedimentation in gravitational field 0.5pm-500pm Fritsch Analysette 20... 

This is a universally applicable instrument for determining particle-size distributions of all kinds of solids which can be analysed either in suspension in a measuring cell or dry by feeding through a solid particle feeder. In the Fritsch Analysette 22 laser diffraction apparatus the measured particle-size distribution is displayed on the monitor in various forms, either as a frequency distribution, as a summary curve or in tabular form and can be subsequently recorded on a plotter, stored on hard disk or transferred to a central computer via an interface. The time required for one measurement is approximately 2min. 

Loss on drying (Mettler LP 16/PM 480 Deltarange infrared balance) Sieve analysis (Fritsch Analysette laboratory sieving machine)... 

Figure 32. (a) Principle of wind sifting and sketch depicting the flow profile in a tube, (b) Principle of an improved counter-currently operating gravitational wind sifter (Fritsch Analysette 8)... 

Figure 33. Principle of an analytical centrifugal sifter (Fritsch Analysette 9)...

Schniirch and Stanetty have shown that synthesis of boionic add esters could be effectively carried out in ball mill (Scheme 4.49) [37]. Equimolar quantities of pinacol or 2,2-dimethylpropan-l,3-diol milled with boronic adds for Ih and washed up with organic solvent afford boronic esters 174 and 175 in excellent purity and high yields (Table 4.17). This ball-milling method is atom efficient and waste free, requiring only a small amounts of nontoxic solvents (ether, ethanol) for isolation. Reaction is much faster (1 h) than the classical methods (several hours or days) which also need removal of water by azeotropic distillation. The scale-up by factor 20 was performed on a Fritsch Analysette 3 PRO ball mill, with the same efficiency as in small-scale batches. 

Analytical Measuring Systems, London Road, Pampisford, Cambridge, Cambs. CB2 4EF, England (01223)836001 Analysette (see Fritsch)... 

The particle size distribution and mean particle size (dso) were determined by the laser diffraction method (FRITSCH Model ANALYSETTE 22, Idar-Obeistein, Germany). One gram of the sample was suspended with 10 ml bi-disdUed water, then the produced suspension (produced with hand shaking) was employed for measuring size analysis. The specific surface area (Sbet) as well as the pore volume of the powders was determined by BET method using a surface area analyzer (Autosoib-1, Quantachrome Instruments, USA). 

Laser particle sizer.Laser diffraction measurements were performed with a Laser Particle Sizer ANALYSETTE 22, 31 channels (FRITSCH GMBH, FRG-Idar-Oberstein) equipped with a liquid dispersion unit. 

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