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BOCHI 190

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The Mini Spray Dryer uses only 0.5 m2 of your laboratory bench.

With the BOCHI 190 Mini Spray Dryer you gain...

emtime

•

•• •money

The compact design and small dimensions of the apparatus make it possible for you to save a consider-able amount of time — compared to larger and pilot equipment. Thanks to the glass components the apparatus can be cleaned in a few minutes and is then ready for the next process.

Only 50-100 ml solution or suspension and the corresponding quantities of product suffice to obtain the first results! Expensive pilot runs need only

(Ste carried out when successful results have been obtained with the use of the Mini Spray Dryer.

•• • laboratory space

•• • a large range of

*applications

zw.41/444,t;e'

Spray drying and micronization Structural changes Microencapsulation Recovering synthetic and extraction products

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The operation principle The Mini Spray Dryer operates on the principle of nozzle spraying in parallel flow, i.e., the sprayed product and the drying air flow in the same direction (111s.1 and 2).

Flow of drying air

Flow diagram of product and • Spray nozzle

Operating elements

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1 Air intake 2 Heating 3 Flow stabilized entrance into the

drying chamber 4 Cyclone separates the product from

the air stream 5 Aspirator 6 Temperature sensor «air inlet».

This temperature is regulated by the heater.

7 Temperature sensor «air outlet». The optimum selection of the temperature difference between the «inlet» and «outlet» tempe-ratures is one of the most. important aspects of spray drying. The outlet temperature cannot be set as desired since it results from a combination between the inlet temperature — aspirator setting and product-feed pump performance.

8 Receiving vessel for the final product

A Solution, emulsion or dispersion of the product

B Peristaltic feed pump C Product channel D Connection for spray flow (pressurized

air or inert gas). E Connection for cooling water F Nozzle needle with twist channel

The needle can be used to clear the nozzle should it become clogged by the product. For difficult products, the nozzle needle can be operated auto-matically. This device is available as an accessory.

The clear placing of the switches and regulators makes the Mini Spray Dryer very easy to operate. The LED-indicators for «inlet» and «outlet» temperatures make the reading easy and accurate.

a Main on/off switch b Regulator and indicator for spray flow c Switch and regulator for feed pump d Switch and regulator for aspirator e Switch, indicator and regulator for

heating f Digital indicator — «inlet temperature» g Digital indicator «outlet» temperature h Connecting sockets for recorder

Application examples of the Mini Spray Dryer 1. Spray Drying Most of real or colloidal solutions, as well as emulsions and dispersions

can be spray dried, provided that the dried product has the characteristics of solid matter. Today the most frequently used method for drying aqueous extracts or solutions is freeze-drying (Iyophilization) which is rather time consuming. The result most of the time, is a «soft cake», which is usually ground to give a dry but very hygroscopic powder. When the Mini Spray Dryer is used, the dried powder is obtained within a few minutes in the form of a uniform powder. It is much less hygroscopic than a lyophilized product. Ingredients which are sensitive to heat, such as enzymes, antibiotics, etc., retain their entire activity.

Example: The spray drying and micronization of sodium sulphite Sodium sulphite crystals prior to dissolution. They often have a particle size more than 100 and are not easy to dissolve.

After being spray dried, the same product has an amorphous form with an average particle size of 4-8 [.t . This shows that the surface area of an active substance can be increased many times by micronization which increas'es its activity.

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2. Preparation of synthetic or extraction products

Today the usual process is to concentrate the extracted product and dry it under vacuum. Very often additional steps such as filtering, centrifuging, etc. are necessary, increasing the likelihood of contamination. In the Mini Spray Dryer the product is added in the liquid form and emerges as a fine, dry powder. Thermal shocks are avoided and contamination is minimized, since the receiving vessel is connected directly to the cyclone.

3. Spray Agglomeration

4. Microencapsulation

In the process of powder coating a fine product is «glued together» with the aid of a filmogen.

This method is used mainly for liquid products which are sensitive to:

moisture — the ambient atmosphere — oxidation

contact with other products in a powder form evaporation, i.e., aromas or perfumes

This process is used to obtain an improved flowability of some inorganic products.

Or if: liquids have to be added to a powder it is necessary to release a product or active ingredient under specific conditions, such as: — at a certain temperature — gastro-soluble or

gastro-resistant pharmaceutical products

A microencapsulation is obtained by homogenizing the liquid product with a solution of the filmogenic material (protecting material). By atomizing the emulsion in the Mini Spray Dryer, a final product is obtained in the form of hollow globules with a diameter of 10-20 11 consisting of a «matrix» mass in which the product is encapsuled.

Example: Microencapsulation of an aroma oil in a carrier substance (filmogen). The hypertrophy shows the homogenized emulsion. Carrier substance/aroma oil

•Ratio: 70% carrier (filmogen) 30% aroma oil

After spray drying Here one can recognize the embedded aroma oil droplets in the «matrix» mass. The diameter of the globules ranges from 10-201.1 in this particular case.

5. Englobe Englobing is carried out the same way as microencapsulation, a solid product instead of a liquid is used. A solution or dispersion is prepared from the product to be processed, a filmogen and a suitable solvent

Or(usually water) is spray dried. he final product emerges in the orm of small globules. Contrary to

the microencapsulation, the product is not 100% encapsulated and protected. For many applications it is advantageous for a small part of the product to be freely accessible on the surface.

Important fields of application for the Mini Spray Dryer Milk and egg products Cereals Plant and vegetable extracts Packaging - Processing Soaps and detergents Perfumes and flavors Bid on Equipmen Aromas

1-847-683-7720 Ceramic productswww.bid-on-equipment.com

Food and feed Pharmaceutical Plastics Polymers and resins Biochemicals Pigments and dyes Blood

Mini . -Spray Dryer BOCHI 190 Technical specifications and accessories •

Accessories

Main voltage Power consumption Current consumption Max.temperature/drying air Max. drying air flow Compressed air pressure Compressed air consumption Dimensions (width/depth/height) Weight Shipping Carton volume Shipping weight

220V/60Hz 2600W 14A 220° C ca. 60 m3/hr 5-8 bar max.1000NI/h 50 x 60 x 100 cm 57 kg approx. 0.8 m3 approx. 71 kg

Nozzle-Set for change to 00.7 mm (for viscous substances) with corresponding mixing needle 15 02 125-0

Automatic/Pneumatic nozzle cleaning unit for 200V/60Hz 15 02 128-4

Aspirator filter, complete 15 02 241-8

Mini Spray Dryer BUCHI 190

Standard version compl. with 1 Glass set, nozzle with 0 0.5 mm, manual nozzle needle, 2 m exhaust tube, supply air tubing, 220V, 60Hz 15 02 000-8

Equipped with aspirator filter 15 02 002-4

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.BRINKMANN Muality products for research and control.

95546 A4 5000 790 Subject to changes without notice Printed in Switzerland

Brinkmann Instruments, Inc. Cantiague Road Westbury, NY 11590 800-645-3050 In New York, 516-334-7500

In Canada: 50 Galaxy Blvd. Rexdale, Ont. M9W 4Y5 416-675-7911