Drying_Technology.pdf

8/13/2019 Drying_Technology.pdf

1/8

Buss-SMS-Canzler

DryingTechnology

Specialist in thermal separationand membrane technology


2/82

Buss-SMS-Canzler Specialist inThermal Separation TechnologyBuss-SMS-Canzler is one of the leading internationalsuppliers of solutions for the thermal separation of mix-tures that are difficult to handle. We are the leadingsupplier of thin film evaporation technology in theworld. We develop and manufacture machines andplants for drying, evaporation, processing highly vis-cous materials, and membrane filtration. Our Test Cen-

tre in Pratteln is equipped with 20 pilot plants for test-ing all kinds of products. Our testing capabilities allowus to develop customer specific process solutions byapplying tailor made equipment and complete sys-tems.We work worldwide for renowned companies inindustries such as: plastics, fibre, polymers, specialtychemicals, agrochemicals, oleo- and petrochemicals,fine, basic and biochemicals, foods and phar-maceuticals, as well as companies working on envi-ronmental and energy problems.Buss-SMS-Canzler accompanies you as consultant,designer and manufacturer through all project stages:from process layout, engineering, mechanical design,

manufacturing, and documentation, to installation,start-up and after-sales service.For future product changes or changing processrequirements, we assist you with our expertise andinnovation, always keeping the costs in sight.

Drying Technologyat a glance

Heat transfer byOperation mode

Pressure on process sideProduct residence timeDryingHeating, CoolingMixingSublimationDesublimationMeltingSolidifyingReactionSuspension, SolutionThixotropic paste, pumpableSludge, hardly pumpableFilter cake

Wet powderGranular (mm)

Very coarse (cm)FibrousCrystallises readilyBreaks up in particlesPasty phaseSticky/viscous phaseCrust-formingTemperature-sensitiveCombustible, explosion riskToxic

Abrasive

VerticalThin Film

CD

C

V, A, Psec

HorizontalThin Film

CD

C

V, A, Pmin

ROVACTOR

CD

B, C

V, A, P(min), hrs

D

ryingbehaviour

Wetprod

uctform

Possible

processes

suitable; applicable fairly suitable, case-to-case evaluation not suitable; not used; not applicable

CD = ConductionC = Continuous operationB = Batch operation

V = VacuumA = AtmosphericP = Overpressure

Buss-SMS-Canzler drying techno-logy comprises various processsteps such as drying, cooling,heating, calcining, reacting, mix-ing, sublimation and sterilisation.The application range covers heat-ing temperatures of -20 C to400 C, process pressures of 0,01

bar to 30 bar and residence timesfrom seconds up to several hours.

Buss-SMS-Canzler offers a programof dryers using different operatingprinciples tailored to meet the indi-vidual process requirements whentreating products with particularcharacteristics and specific dryingbehaviour.

REACTOTHERM

CD

B, C

V, A, P(min), hrs


3/83

VerticalThin FilmDryer

Process Features

Continuous processing of liquid and pump-able products to get dry solids in one step

Gentle treatment of products thanks toshort residence time and if necessary operation under vacuum

Fully enclosed design to treat explosive,toxic and hazardous substances.

Complete recovery of solvents Contact drying to ensure optimal energy

utilization Self-cleaning of heating surface, hence a

constant high heat transfer

Applications Agrochemicals (Atrazine etc.) Waste water and spent liquors Chlorides, bromides, sulfates Silane recovery Benzosulfonic acid Chemical intermediates Solvent recovery from waste Carbonates, phosphates Silicon, silicon carbide Xanthates Dyes and pigments

Glycerine recovery from salt Sodium formiate Boron carbide, boron nitride Caffeine, condiments

Thin film dryers are characterised bya mechanically agitated thin productlayer. The film thickness is normally inthe range of less than one up to a fewmillimetres.In vertical thin film dryers the wetfeed is distributed over the heatedwall by a distributing ring and evenly

applied to it in a thin film by hingedpendulum blades. Running down-ward the product passes typicallythrough an evaporation zone, then aslurry or cristallisation zone and final-ly a powder zone. Most of the liquidis removed in the evaporation andslurry zone while in the powder zonethe surface moisture from the solid

Product inlet

Pendulum element

Rotor

Heated shell

Vapour

Product outlet

particles and some of the internalmoisture is driven off.The volatile components driven outof the product by heat pass upwardthrough the dryer counter-current tothe product flow and are con-densed in an external condenser.The powder obtained at the bottom is

discharged continuously via a suit-able gaslock system. The total resi-dence time of the product is bet-ween 30 and 60 seconds.

Principle vertical thin film dryer.

Combination of vertical- and horizontal thin film dryers.


4/84

HorizontalThin Film Dryer

Horizontal thin film dryers are con-tinously operated contact dryers fora broad range of applicationsunder vacuum, normal pressureand overpressure. They consist of ahorizontal, externally heated shell

with end covers, the inlet and outlet

nozzles for feed, vapour and finalproduct and a rotor with screwed-on elements supported in externalbearings. The wet product fedthrough the inlet nozzle is conveyedsteadily by the rotor elements alongthe heated dryer wall in a thin film.The film thickness is normally sever-al millimetres.

Applications DRYING of slurries, sludges, pastes, filter cakes, wet powders HEATING and COOLING of solids MELTING (Urea etc.)

REACTION MIXING of solids with liquids and subsequent thermal processes

Process Features Continuous, fully enclosed processing Short residence time, small product hold-up Low energy consumption Superior mixing efficiency Flexible through exchangeable rotor elements Self-cleaning of heating surface Easy access

Vapour

Product inlet

Product outlet

Heatingmediu

m

Horizontal thin film dryer for drying of sludges.

Vapours pass counter-currently to theproduct flow and leave the dryerclose to the feed nozzle. Moisturelevels of a few tenth of a percent upto 5 % and more can be achieved.The residence time of the product istypically between 5 and 15 minutes.

Heating

medium


5/85

REACTOTHERM

Process Features

Self-cleaning heating surfaces Constant heat transfer with fouling

products Intensive mixing and kneading effect Optimal heat/mass transfer with pasty

and sticky products Universal use for liquid, pasty and

solid products Several processes in one machine

Applications

DRYING: Polymers Intermediates for pharma

Fine chemicals Food Dyes, optical brighteners Antioxydants Phosphate salts Surfactants Paint and varnish sludges

REACTIONS: Resorcinol Salicylic acid Benzoic acid Sodium cyanate

RESIDUE TREATMENT: TDI-recovery Chemical waste with organic solvents Radioactive waste

The inside of the shell is cleaned bymixing bars avoiding the fouling ofheat exchange surfaces and the for-mation of agglomerates. Shell,shaft and discs can be heated or

cooled. Continuous or batch opera-tion under vacuum, atmospheric pres-sure and overpressure is possible.

Product inletVapour

Product outlet

Heating mediumRotor in/out

Mixing hook

Segment disc

Mixing bar

The REACTOTHERM is used forthermal processing of a wide va-riety of pasty, viscous, fouling andlumping products. It consists of acylindrical, horizontal shell and a

rotor with segmented discs and mix-ing bars. Stationary mixing hooksare attached to the inside of theshell. The close clearance betweenthe mixing hooks, the segmenteddiscs and the rotor results in a highmixing and kneading effect andlargely self-cleaning properties ofthe rotor.

REACTOTHERM for batch operation.

Rotor of a continuous REACTOTHERM.


6/86

ROVACTOR

The ROVACTOR is an efficientcontact processor with high localmixing effect for the treatment offilter cakes, powders and pellets.The ROVACTOR consists of a

cylindrical or trough shaped bodyand a hollow agitator shaft fittedwith special paddles in form ofsegmental discs.Heating or cooling is effected indi-rectly by means of steam or atransfer fluid via the segmentedrotor discs and the jacketed body.

Continuous and batch processesunder vacuum, atmospheric pres-

sure or overpressure are possible.Product residence times are bet-ween a few minutes and severalhours and can be adjusted in alarge range. The processor can beeasily protected against wear andtear.

Applications

CHEMICALS: Catalysts Carbon, carbon black Limestone Gypsum Sodium chloride Detergent additives Detergent intermediates

Uranium oxidePOLYMERS: Polypropylene Polyethylene Polyvinyloxide Terephthalic acid

FOOD: Cocoa Flour Sweets Pectin

ENVIRONMENT:

Industrial sludge Refinery sludge Oil drilling sludge Contaminated soil

Product inletVapour

Heatingmedium

Heatingmedium

Heatingmedium

Heatingmedium

Heatingmedium

Heatingmedium

Product outlet

Large ROVACTOR for solvent-wet polymers.

ROVACTOR in fine chemicals industry.

Process Features Continuous, enclosed processing of toxic,

inflammable and explosive products Uniform product temperature, processing of

heat-sensitive products Contact drying with low energy consumption Low rotor speed: minimum dust production,

minimal particle size reduction, suitablefor abrasive products

High heat transfer coefficient:high through-put rates per unit


7/87

CONTIVAC NDPProcessor for Pharmaceutical

ApplicationsThe CONTIVAC NDP processorwas developed by Buss-SMS-Can-zler for use in production process-es with special hygienic require-ments. This processor combinesthe advantages of continuous thinfilm drying with a special rotatingspray nozzle (patent pending) that

allows for CIP cleaning. The indi-vidually adjustable heating andcooling zones in the thin film dryeropens up new opportunities forthin film drying technology to beused in complex processes.The basic operations of mixing,reacting, flashing and drying canbe carried out in the same ma-chine, with several different sub-stance streams being fed into theprocessor simultaneously.

The CONTIVAC NDP processoroffers manufacturers in the phar-maceutical-, fine chemical indus-trys and in the food and pet foodindustries, with new possibilitiesfor process optimisation and quali-ty improvement, which are notavailable with conventional batchmachines.Batch-operated dryers have prob-

lems with products, which passthrough a sticky, viscous phaseduring drying.Such cases require very long resi-dence times which can causeunwanted side-reactions, thermaldamage to the product, and/orcolour changes. Experience hasproven that the residence time inthe CONTIVAC NDP processorcan be reduced up to 500 times.

Further advantages compared tobatch systems result from the lowinvestment and operating costs.

Process features

Combination of variousbasic operations in onemachine (no transport pro-blems, no contaminationof the product)

Very short residence times(minimum thermal stress ofproduct, high through-put)

Very low hold-up(minimum losses atproduct change)

Principle of Contivac NDP. Dryer with vapour filter.

Vapour

Feed 3

Dried product Feed 2 Feed 1

The design of the CONTIVACNDP processor complies with therelevant GMP requirements.Shaft sealing and bearings areconstructed compatible with phar-maceutical requirements (e.g. car-tridge construction).

Temperature zones and feed options.

Applications

Pharmaceuticalintermediates

Food

Pet Food


8/8

ww

w.werbeagentur-now.deGieen06

41-25

09433

05/06

Specialist in thermal separationand membrane technology

Head Office & WorkshopBuss-SMS-Canzler GmbHKaiserstrae 13-15D-35510 ButzbachTel: +49 60 33 - 85 - 0

Fax: +49 60 33 - 85 - 249

Branch Office & Test-CenterBuss-SMS- Canzler GmbHHohenrainstrae 10CH- 4133 Pratteln 1Tel : +41 61 - 8256 - 869

Fax: +41 61 - 8256 - 766

Email: [email protected]

Branch OfficeBuss-SMS- Canzler GmbH

Am Langen Graben 7D-52353 DrenTel: +49 24 21 - 705 -1

Fax: +49 24 21 - 705 - 80

CONTIVAC NDP Processor

Drying_Technology.pdf

Documents

Transcript of Drying_Technology.pdf