Sherwood Scientific Fluid Bed Dryer


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SHERWOOD SCIENTIFIC FLUID BED DRYER
LAB-SCALE, PROGRAMMABLE & ANALYTICAL WITH ALL THE ADVANTAGES OF FLUID BED DRYING FASTMILDNON-AGGLOMERATING REPRODUCIBLEHOMOGENEOUS
WITH A LARGE RANGE OF TUB ASSEMBLIES, CONSTRUCTION MATERIALS AND SOFTWARE THE MODEL 501 OFFERS A FLEXIBLE PLATFORM ABLE TO ASSIST WITH; · STUDIES OF MATERIAL DRYING BEHAVIOUR · THE OPTIMISING AND SCALE-UP OF DRYING PROCESSES · PREPARATION OF SMALL SAMPLE BATCHES FOR SUBSEQUENT MATERIAL STUDIES
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SHERWOOD SCIENTIFIC FLUID BED DRYER

WHAT IS FLUID BED DRYING?
By forcing enough gas (air) through a bed of particles, the bed may assume a fluid-like state (resembling a boiling liquid). Heating the incoming air and managing air flow rate through the Model 501 provides thorough mixing and maximum contact of solid with moving air.
The result; a process more even and much quicker than conventional drying methods.
FAST
Delivering up to 2.5m3 per minute of air, the model 501 can break up wet samples, and ensure vigorous mixing and rapid moisture removal.
5 kg of wet “ideal” sample (80% moisture) can be dried in 15 - 20 minutes (5 litre tub).
MILD

WHY USE THE SHERWOOD SCIENTIFIC FLUID BED DRYER?
PROGRAMMEABLE
The Model 501 can be programmed (via computer interface) to step through unlimited drying stages with the following parameters defined and controlled: Timer, Blower motor speed, Inlet air temperature. An optional pulse flow module is available for difficult to fluidise samples. Those parameters are monitored and recorded throughout the drying programme. Each programme step may be terminated manually or when a pre-set time is reached or when a selected outlet temperature or relative humidity has been achieved; whichever condition occurs first.
ANALYTICAL
Downstream air temperature and relative humidity information may be obtained using a probe within the tub assembly (above the sample bed) and fed to a PC. This allows observation of the drying process in real time. All data is logged via RS232 and may be stored for future reference and processing.

High air flow rate gives: · high moisture removal rates at relatively low temperatures · thorough mixing, so no wet spots requiring extra thermal energy to penetrate · an air cushion between particles to reduce abrasion and particle size alteration.
NON AGGLOMERATING
Air separated particles prevents lumps and caking, both of which make other drying processes much slower.
HOMOGENEITY OF SAMPLE
Static drying methods leave evaporation residues at the sample surface giving a heterogeneous sample. Fluid Bed Drying achieves the opposite mixing during drying gives homogeneous samples making an ideal method of representative sample preparation for subsequent material analyses.

REPRODUCIBLE
Microprocessor control of air flow, inlet air temperature and drying period coupled with fluid bed action gives highly reproducible experiments and finished samples. After preliminary experiments, a known moisture content in the final sample (ideal for tablet forming) or removal of external (surface) moisture only, may be achieved. Drying times to required moisture content may be optimised and drying patterns studied to aid scale-up and plant design.
Without a PC connected the Model 501 can run one stored programme of up to 16 steps (previously downloaded from a PC), or may be used as a conventional (manually controlled) FBD. Additional features of this advanced in-lab dryer technology include:
• Precise air flow feed-back control • Membrane sealed controls to prevent ingress of particles into
the instrument. • Reduced operating noise.

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SHERWOOD SCIENTIFIC FLUID BED DRYER
FLUID BED DRYERSPECIFYING PROCESS
The Sherwood Scientific Model 501 Fluid Bed Dryer is a Lab Scale (Bench Top) dryer with a maximum sample capacity of 5Kg. There is a wide variety of drying tubs (volume and material of construction), inlet & outlet filters, and other accessories available; both to handle as wide a range of sample types as possible and enhance the capability of the drying system. Therefore each system requires specifying in some detail to reflect individual customer requirements and sample characteristics in order to prepare an appropriate quotation.

Outlined below are prompts about the sample type and required process and hence implications for component selection:

SAMPLE TYPE
Sample quantity (weight and/or volume)

SYSTEM “REQUIREMENTS”
A wet sample should occupy about 1/3 of the tub assembly volume. As a sample dries and its density drops, its apparent volume will increase to about ½ the volume. Tubs should be purchased that are 3 x the volume of the sample size. The mini tubs are 250ml in capacity and can be used effectively on samples weighing from 5 to 50 grams per tub. Four tubs can be dried simultaneously.

Moisture content at start of drying process

The 501 is designed for damp materials not slurries with free water.

Flammable Solvents present

The 501 is not spark or explosion proof. It is not suitable for the removal of flammable solvents with low flash points.

Particle size—minimum to maximum (not just average)

You need to know the minimum particle size in the sample in order to choose a suitable mesh/pore size for inlet and outlet filters to prevent sample falling out the bottom of the tub or being blown out the top.

Tub made from glass or metal

Glass is ideal for developing drying processes; you can observe the material’s behaviour as it dries. The optimum flow rate is easy to select judging by the fluidised samples appearance. The operator may estimate the state of dryness, shape and particle size distribution by the appearance of the sample flowing in the tub. Stainless Steel could be useful in the food industry where regulations may not permit use of glass items within food production or preparation areas.

Sealed tub or filter bag

Samples with a wide or bi-modal particle distribution are difficult to fluidise without sample overflow into the bag. A sealed top cap is advisable for such samples and any sample with a particle size less than 40 microns. 3 micron polyester filters can be used for mini tubs, 2 and 5 litre tubs. These filters are effective for 5 to 25 micron particles but greatly reduce air flow rate through the sample. Drying times normally occurring between 10 to 30 minutes can take up to several hours. Many of the main advantages of fluid bed drying may be lost.

DRYING PROCESS
Simple dryer Multistep drying process In-time drying progress feedback
Data collection Data manipulation with drying curve generation. Add sample to dryer without removing outlet filter

None
Add software and RS232 cable
Add Moisture/Humidity Probe which means you have to select a tub with a GL32 side port. Only the 5 litre glass tub assemblies, 500 35 010 and 501 35 020 can have an inlet for the outlet humidity and temperature probe. Only these tubs can fully utilise all the features on the M501.
Add software and RS232 cable
Add software and RS232 cable
Specify DMA tub (501 35 020)

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SHERWOOD SCIENTIFIC FLUID BED DRYER

1] Model 501 shown with 5 litre glass tub 500 35 008 and large filter bag. Remember to specify tub inlet filter (mesh size and material type) and bag material required.

2] Model 501 shown with 5 litre glass tub with GL32 side port 500 35 010, temperature/humidity probes and large filter bag. Please specify tub inlet filter (mesh size and material type) and bag material required and remember to order the temperature humidity probe 501 86 500.

3] Model 501 shown with 5 litre glass DMA tub 501 35 020 with sealed top-cap assembly and GL32 side port and temperature/humidity probe plus side port for samples. Please specify tub inlet filter (mesh size and material type) and top cap filter (required mesh size and material type) and remember to order the temperature humidity probe.

4] Model 501 shown with multi tub unit 500 35 011 and glass minitubs with fixed top-caps and bags for drying of small batches of sample.

5] Model 501 shown with low density classifier 500 35 048 which allows for fractionation of samples with wide particle size/density distribution and collection of fractions within that range. It also allows separation of desirable sample elements from bulk samples, for example, removal of tree seed “wings” from the seeds.

1

2

3

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5

(Image 4 for illustration only -real systems should be all bag or all top-caps)
OTHER ACCESSORIES:
Pulse flow module helps to interrupt airflow and help breakup agglomerated “wet” samples e.g. “wet” tea. Can be used manually or controlled via software which offers a greater variety of pulse lengths and the option to reduce or switch off as the material being dried becomes more free-flowing. RS232 Cable for connection between PC and base unit. Software for control of variable functions, data monitoring and feedback and creation of multistep drying programmes design to dry samples in the most efficient manner and taking into account the changes in the material’s behaviour as its moisture content changes. Humidity/temperature probe for in-tub, above sample, real-time feedback of temperature and relative humidity
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SHERWOOD SCIENTIFIC FLUID BED DRYER

THE BASIC DESIGN
The basic Model 501 incorporates an air pump, heating coil, and temperature measurement (with control and timer). Air is drawn through an inlet filter, passed over a heating element and forced through a support filter (which holds the weight of the sample) and a Tub inlet filter (selected for pores smaller than the sample particle size). The air passes through the sample contained within a tub (glass or stainless), and finally through an Outlet filter which can be a Filter Bag. Bag material is selected to be chemically inert to emitted sample vapours. Alternately, “sealed” tub assemblies are available, where a filter plate (which has an outlet filter and support filter) seals onto a flanged tub with a silicon “0” ring and clamp (for particles less then 40 microns in size).

The user has to specify the tub together with the inlet and outlet filters required for their application as follows: Material of construction: Glass or Stainless Steel Tub Volume: 5 litre, 2 litre or Mini tub (for use with multi-tub base adapter) Tub Type: Ordinary (Bags), Sealed, Analytical (GL32 side port) DMA, Classifier, Mini, Custom Inlet Filter: Material type, pore size, Outlet Filter: Bag, Top Cap, Material type, pore size
ACCESSORIES ALSO TO BE SPECIFIED INCLUDE, • Pulse flow module (501 86 001) • Humidity/Temperature Probe (501 86 500) • RS232 cable (926 09 052) • Software (501 86 700)

BAG MATERIAL SELECTION (NYLON OR TERYLENE ARE NORMALLY CHOSEN) Nylon is resistant to alkali vapours Terylene shows greater resistance with acids Polypropylene is resistant to most chemicals but degrades more rapidly (than the other two) over 100oC Nomex is an alkali tolerant material suited to sustained high-temperature drying, e.g. ~200oC

Filter Bag Options

Tub Units

Sizes

Materials

2 Litre Tub and Base Unit

Glass 500 35 008 Stainless Steel 500 35 005

5 Litre Tub and Base Unit

Glass 500 35 009 Stainless Steel 500 35 008

Tub Assembly 5L with GL32 port supplied with screw fitted blank plate To fit Humidity Probe 501 86 500

Glass 500 35 010

Multi Tub Unit 500 35 011

Stainless Steel 4 x 500 35 012 Glass 4 x 500 35 013

5l Sealed Glass Tub & Base with Clamp 500 35 014
5L Moisture Analysis Tub Assembly has ports for sample and Humidity probe.(501 86 500). Both ports supplied with screw fitted blank plates with GL32 port supplied with screw fitted
blank plates Glass 501 35 020

Tub Assemblies Sealed Tub Options — (GLASS ONLY)
(includes Silicon “o”-ring & ground glass flange with clamp)

Low Density Classifier Assembly; Glass 500 35 049

Multi Tub Unit 500 35 011
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Glass 4 x 500 35 033

Inlet Filters

Outlet Filters

SS 60 Mesh Support Filter (500 35 113)
with 45 micron Nylon Inlet Filter (500 35 110) as standard Also available; SS 250 Mesh 500 35 114 SS 500 Mesh 500 35 115

Large Filter Bags Nomex 500 35 407 Nylon 500 35 400 Polypropylene 500 35 404 Terylene 500 35 402

SS 60 Mesh Support Filter 500 35 132 fitted as standard
45 Micron Nylon support filter (500 35 305) fitted as standard with

Small Filter Bags Nomex 500 35 408 Nylon 500 35 401 Polypropylene 500 35 404 Terylene 500 35 402

SS 60 Mesh Support Filter (500 35 113) with 45 micron Nylon Inlet Filter (500 35 110) as standard Also available: SS 250 Mesh 500 35 114 SS 500 Mesh 500 35 115 and
3 Micron Polyester filter for smallest particle size 500 35 120. Note; Max temp use is 100oC for this material
and achievable air flow-rates will be severely reduced. Both those factors mean longer drying
times if this material has to be used)

Top Cap with 45 Nylon Filter 500 35 020 Top Cap with 250 Mesh Filter 500 35 021 Top Cap with 500 Mesh Filter 500 35 022
Top Cap with Nylon Filter BAG 500 35 023
Top Cap & 3 micron Polyester Filter 500 35 024
500 35 020 fitted as standard to low density classifier

Sealed Mini Tub Inlet and Outlet Sets Mini Nylon Filter Set 500 35 310
Mini 3 Micron Polyester Filter Set 500 35 311 Mini 250 Mesh St. St. Filter Set 500 35 312 Mini 500 Mesh St. St. Filter Set 500 35 313
(St.St. Support Filter 60 mesh 500 35 309 and nylon bottom support 500 35 305 fitted as standard)

SHERWOOD SCIENTIFIC FLUID BED DRYER

APPLICATION OF SHERWOOD FLUID BED DRYERS:
Sherwood Fluid Bed Dryers have been used on hundreds of different sample drying applications, from 10 gms to 5 Kgs. In addition, they have been used to mix solids, form uniform coatings, determine drying parameters, analyse for moisture by weight loss, form fine granular particles from agglomerates, act as a chemical reactor, and classify (separate) particulates by density, size, and surface texture.

Food Products & Technology
Germinated barley Brewer’s yeast Cereals Coffee Grains Animal food Rice Tea Sodium Alginate

Minerals & Mining

Chemical & Biochemical

Plastics & Resins

Coal, Coke Copper Sulphate Feldspar Ferrous Sulphate Hydrous Limestone Magnesium Sulphate hydrate Peat Potassium Fluoride Sand

Chenodeoxycholic Acid General chemicals Drying Agents Ion exchange Resins Sephadex Mol. Sieve Dyes & Pigments Phosphors & fine silica

Diakon acrylic polymer Granular polymer (Nibs) Hydrophobic polymers Hydrophilic polymers Propylene-ethylene copolymers Spherical polymers

If your particular drying application is not listed please contact; [email protected]

Pharmaceuticals
Lithium carbonate Cystein chioralose Salicylic Acid Pancreatic Bile acid and salts 5 sulphosalicylic acid Plant extracts

Substances take up water in two ways

External moisture is on the surface of particles and evaporates just like liquid water

Internal moisture is absorbed into the matrix of the particles and takes more time and energy to be released

The Drying Curve
Generated by measuring weight loss over time while drying

Drying TeChnology
Drying occurs in two stages: firstly removal of surface water, which occurs at a constant rate and secondly loss of moisture from within a particle which is usually diffusion dependant
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ACTuAl Drying Curves
from a variety of Solid samples

SHERWOOD SCIENTIFIC FLUID BED DRYER
WHAT IS FLUID BED DRYING?
Drying curves were traditionally generated by sequential weighing over time periodically interrupting the drying process. Using all the features of the 501 fluid bed dryer i.e. in-tub temperature /humidity probe & software, all data can be logged and stored for future reference and subsequent manipulation. Raw data can be manipulated using software to produce drying curves.
Inlet air temperature, blower motor speed, in-tub temperature and relative humidity can all be recorded against time (using software and the temperature humidity probe).
Raw data logged can be manipulated using Sherwood software so this can be converted……

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…..to a Drying Curve without having to interrupt the drying process

INTRODUCTION AND HERITAGE

Based in Cambridge, a centre of Scientific Excellence in the UK, Sherwood Scientific Ltd is a manufacturing company with a history of successful innovations and developments designed to provide continual improvement and added value to its product range.
Sherwood Scientific Ltd produces a world renowned product range including CHROMA Colorimeters, Flame Photometers and Chloride Analysers; whose origins can be traced back to the 1950s, with continuous

developments since then by Corning prior to acquisition of all manufacturing and design rights by Sherwood in the 1990’s. Sherwood Scientific Ltd also manufactures the MICROWELDER gas generator based flame welding system used in jewellery, electronics and acrylic sign manufacturing; a programmable Laboratory Fluid Bed Dryer; and the world's most sensitive Magnetic Susceptibility Balance. These products have a history which can be traced back to the Johnson Matthey Instrument division.

SHERWOOD SCIENTIFIC PRODUCT RANGE

Flame Photometers We have a complete range of Flame Photometers; from single channel to multi-channel, analogue to digital, computer controlled and automated analysis packages for Sodium, Potassium, Lithium, Calcium, Barium, Cesium, Rubidium and Strontium analysis Clinical and Industrial Chloride analysers We also manufacture Clinical and Industrial Chloride analysers based on coulometric titration technology; offering the best available means of Chloride determination in food, pharmaceutical and industrial products etc. In addition clinical chloride measurement is also possible for example, with samples as small as 20ul of sweat as may be required for Cystic Fibrosis confirmations. CHROMA colorimeter range Our CHROMA colorimeter range has wide utility. These fully open, programmable units, with three absorption unit capability across the whole wavelength range may be utilised with any commercially

available test kits for water quality monitoring, clinical chemistry measurements and many other colorimetric determinations. Model 501 Fluid Bed Dryer The bench top, lab-scale, programmable Model 501 Fluid Bed Dryer offers a microprocessor controlled base unit with the widest range of tub materials and configurations; with inlet and outlet filters to match a broad variety of sample types and particle sizes. With in-tub temperature and humidity feedback capability coupled to a powerful software package providing real-time drying condition feedback and display; this unit allows rapid development of drying protocols and understanding of material drying behaviour. Magnetic Susceptibility Balances For those engaged in study of the magnetic properties of materials, our Magnetic Susceptibility Balances offer unsurpassed sensitivity and reliability. We truly are world leaders in this field of analytical chemistry

Sherwood Scientific is represented by a worldwide distributor network. Our distributors and their customers attend courses on existing and new products at Sherwood's facility in Cambridge. Sherwood can also be contacted via the Internet where news of products, applications and other information is available. For more information and a list of our distributors in your locality visit our website and/or send an email.
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Sherwood Scientific Fluid Bed Dryer