Layout

Buss-SMS-Canzler is a leading inter- More than 500 dryers
national supplier of thermal separa- tion solutions for difficult products For more than 50 years we have sup- and mixtures.
plied different types of dryers, adap- We are the world's leading supplier ted to a large variety of applications of thin film evaporation technology, throughout the world, currently more this is due to the long-standing expe- than 500 dryers. Based on our long- rience of the three former companies standing experience and supported Luwa, SMS, Buss and Canzler. This by lab and pilot tests, the specialists long experience and expertise is now at Buss-SMS-Canzler select the most incorporated into Buss-SMS-Canzler.
suitable drying technology for your For our customers around the world application. Lab tests in our lab we develop and manufacture machi- equipment show general feasibility.
nes and plants for evaporation, pro- Tests in our pilot plants provide the cessing of highly viscous materials, basis for the design of our dryers.
membrane filtration and drying. Our These studies are not only carried out experience and our test centre allow upon our customers' request, but also us to develop customer specific pro- to investigate new applications on cess solutions by applying tailor-made our own development projects, as for equipment and complete systems. example the TDI recovery in the CFT Buss-SMS-Canzler partners you as dryer (page 12).
consultant, designer and manufactu-rer through all project stages: fromprocess layout, pilot tests, enginee-ring, mechanical design, manufactu-ring and documentation, to instal-lation, start up and after sales service.
CP dryer in outdoor test stand Four horizontal thin film dryers for a Chinese customer

Drying Technology
at a Glance
The Buss-SMS-Canzler range of dry- Buss-SMS-Canzler offers a program of Vertical and horizontal thin film dryersers carries out the following process dryers using different operating prin- with thin product layers on the heatsteps: drying, cooling, heating, calci- ciples tailored to meet the individual exchange surface, the ROVACTOR®ning, reacting, mixing, sublimation process requirements when treating with specific paddles to convey lumpyand sterilisation.
products with particular characteris- wet feed, the REACTOTHERM® with The product range covers heating tem- tics and specific drying behaviour. self-cleaning hooks for sticky products peratures of -20°C to 400°C, process as well as the CFT dryer with its me- pressures of 0,01 to 30 bar and resi- chanically agitated fluid bed are tech- dence times from seconds up to seve- nically mature solutions for a large variety of different drying applicati-ons.
CFT dryer
Heat transfer by
Pressure on process side
Product residence time
ce Mixing
p Desublimation
Suspension, Solution rm Thixotropic paste
Sludge, hardly pumpable ct fo
u Filter cake
d Wet powder
t p
e Very coarse (cm)
W Fibrous
r „Breaks up" in particles
io Pasty phase
a Sticky/viscous phase
e Crust forming
b Temperature sensitive
in Combustible, explosion risk
• suitable/applicable • fairy suitable/case-to-case evaluation C = Continuous operation – not suitable/not used/not applicable B = Batch operation

Vertical
Thin Film Dryers
Thin film dryers are characterised by duct passes typically through an eva- The volatile components driven out ofa mechanically agitated thin product poration zone, then a slurry or crystal- the product by heat, pass upwardlayer. The film thickness is normally in lisation zone and finally a powder through the dryer counter-current tothe range of less than one up to a few zone. Most of the liquid is removed in the product flow and are then conden-millimetres.
the evaporation and slurry zone while sed in an external condenser. The In vertical thin film dryers the wet feed in the powder zone the surface mois- powder obtained at the bottom isis distributed over the heated wall by ture from the solid particles and some discharged continuously via a suitablea distributing ring and evenly applied of the internal moisture is driven off.
gaslock system. The total residence to it in a thin film by hinged pendulum time of the product is between 30 and blades. Running downward the pro- Manufacturing of CP rotor • Agrochemicals (Atrozine etc.) • Continuous processing of liquid and • Waste water and spent liquors pumpable products to get dry solids in • Chlorides, bromides, sulfates • Silane recovery • Gentle treatment of products thanks to • Benzosulfonic acid short residence time and – if necessary • Chemical intermediates – operation under vacuum • Solvent recovery from waste • Fully enclosed design to treat explosive, • Carbonates, phosphates toxic and hazardous substances • Silicon, silicon carbide • Complete recovery of solvents • Contact drying to ensure optimal • Dyes and pigments energy utilization • Self-cleaning of heat exchange surface, • Sodium formiate hence a constant high heat transfer • Baron carbide, baron nitride• Caffeine, condiments Assembly of CP dryer Horizontal
Thin Film Dryers
Horizontal thin film dryers are continu- Vapours pass counter-currently to the ously operated contact dryers and product flow and leave the dryer close used for a broad range of applications to the feed nozzle. Entrained particles of slurries, sludges, pastes, filter cakes, under vacuum, atmospheric pressure are removed in the wet zone. • HEATING and COOLING of solids and overpressure. They consist of a ho- Moisture levels of a few tenth of a • MELTING (Urea etc.) rizontal externally heated shell with percent up to 5% and more can be end covers, the inlet and outlet nozzles achieved. The residence time of the for feed, vapour and final product, product is typically between 5 and of solids with liquids and subsequent thermal processes nozzles for the heating medium and a rotor with screwed on elements suppor-ted in external bearings. The wet pro-duct fed through the inlet nozzle is conveyed steadily by the rotor ele- • Continuous, fully enclosed processing ments along the heated dryer wal in • Short residence time, small product a thin film, al owing an optimum heat • Low energy consumption transfer and a high evaporation per- • Superior mixing efficiency • Flexible through exchangeable • Self-cleaning of heat exchange surface• Easy access Transport of thin film dryer for food industry • High heat transfer coefficient Thin Film Dryer with pulled rotor The Combi-Dryer from Buss-SMS- the high speed rotor. The pre-dried • Product loss is minimized due to theCanzler consists of a combination of a product falls from the drying zone of compact arrangement vertical dryer and a horizontal thin film the vertical dryer directly onto the • No intermediate storage or dryer. Special features of thin film con- rotor of the horizontal dryer. This rotor conveying device is required conveys the product in horizontal di- between first and second drying tact drying technology: rection to the product outlet on the op- • Gentle treatment of heat sensitive posite side of the dryer.
• Different heating media as well as products due to a short The vapours of both dryers flow in different temperature profiles can be counter-current direction to the pro- • Fully enclosed design to treat duct, and then through the vapour explosive, toxic and hazardous nozzle of the vertical dryer into the Applications
next process stage.
The dryers are widely used throughout • Continuous operation the process industries to convert li- • Small hold-up Advantages of the
quids, slurries and pastes to free flo- wing solids in continuous, single pass • Entrained fine particles from the The wet product is fed into the vertical horizontal dryer are removed in the dryer directly above the heating zone top wet zone of the vertical dryer The Combi-Dryer is applied for
and evenly spread as thin turbulent film on the heat exchange surface by • Dyes and pigments • Optical whitener • Polypropylene suspensions • Organic and inorganic salts • Polyethylene slurry Industrial use of Combi-Dryer The ROVACTOR® is an efficient con- tact processor which provides a high • Continuous enclosed processing of toxic, local mixing effect for the treatment of inflammable and explosive products filter cakes, powders and pellets. The • Uniform product temperature, processing • Carbon, carbon black ROVACTOR® consists of a cylindrical of heat sensitive products or trough shaped body and a hollow • Contact drying with low energy • Sodium chloride agitator shaft fitted with special • Low rotor speed: minimum dust • Detergent additives paddles in form of segmental discs. production, minimal particle size • Detergent intermediates Heating or cooling is provided indi- reduction, suitable for abrasive products • Uranium oxide rectly by means of steam or a transfer • High heat transfer coefficient: high throughput rates per unit fluid via the segmented rotor discs and the jacketed body.
• Polyvinyloxide Continuous or batch processes under • Terephthalic acid vacuum, atmospheric pressure or overpressure are possible. Product re- sidence times can be adjusted in a large range. The processor can be easily protected against wear and • Refinery sludge• Oil drilling sludge• Contaminated soil Rotor of a ROVACTOR® Large ROVACTOR®for drying solvent moist synthetics The REACTOTHERM® is used for ther-mal processing of a wide variety ofpasty, viscous, fouling and lumpingproducts. It consists of a cylindrical,horizontal shell and a rotor with seg-mented discs and mixing bars. Statio-nary mixing hooks are attached tothe inside of the shell. The close clea-rance between the mixing hooks, thesegmented discs and the rotor resultsin a high mixing and kneading effectand largely self-cleaning properties ofthe rotor.
The inside of the shell is cleaned bymixing bars avoiding the fouling of REACTOTHERM® for continuous operation heat exchange surfaces and the for-mation of agglomerates. Shell, shaft and discs can be heated or cooled.
• Self-cleaning heat exchange surfaces Continuous or batch operation under • Constant heat transfer with fouling vacuum, atmospheric pressure and overpressure is possible.
• Intensive mixing and kneading effect• Optimal heat/mass transfer with pasty and sticky products • Universal use for liquid, pasty and solid • Several process steps in one machine Applications
DRYING:
• Polymers
• Pharmaceutical intermediates
• Fine chemicals
• Food
• Dyes, optical brighteners
• Antioxidants
• Phosphate salts
• Surfactants
• Paint and varnish sludge
REACTIONS:
• Resorcinol
• Salicylic acid
• Benzoic acid
• Sodium cyanate
RESIDUE TREATMENT:
• Chemical waste with organic solvents
• Radioactive waste
Rotor of a REACTOTHERM® CFT – Combi Fluidization
Technology
The main component of the Combi This technology can be used for many Many of the slurries and sludges oc-Fluidization Technology is the CFT different applications, as various hea- curing in the field of environmentaldryer. This dryer is filled with dry pro- ting methods are available and tem- protection, as e. g. paint and varnishduct, which is fluidized by the rotor. peratures up to approx. 600°C can sludges, can be processed under at-The wet product is fed into the hot be reached. The CFT dryer can be mospheric pressure. fluid bed and due to the movement of operated under vacuum or overpres- The Combi Fluidization Technologythe bed it is evenly distributed throug- sure.
also offers a very interesting alterna- hout the dry product and dried effi- tive with regard to cost and energy demand compared to the spray dry- The formation of sticky/viscous pha- ing of products with sticky phases, if ses, the direct contact of the wet feed no specific properties and conditions with the heat exchange surface and of the dry product are required.
the consequential formation of crustsare avoided to a large extent.
The whole process is comparable toconventional drying with external re-flux system, but with the Combi Fluidi-zation Technology the externalmechanical work is no longer neces-sary. The vapour cleaning is integrated intothe drying room of the CFT dryer, sothat the vapours can be easily proces-sed in a condenser or rectifier.
CFT lab dryer Combi Fluidization Technology twin pack Salt Drying:
Efficiency by Combination
A very common drying application is The composition of salt mixtures may By combining dryers with different the drying of salts and salt mixtures, lead to operational malfunctions due operating principles, such salt soluti- to the formation of crusts. In particu- ons can be processed very efficiently, • in natural sources lar, if salt mixtures contain compo- e.g. a salty solution from the flue gas • in down gradients of chemical nents like sodium sulphate, hard scrubber can be largely dehydrated crusts may form on the heat ex- in a vertical CP dryer. The residual • as product from the neutralization change surface. At best these crusts moisture of the product from the first plant of the flue gas scrubber only reduce the performance of the step is removed in the CFT dryer, thus • as residue from membrane proces- dryer, but if the worst comes to the combining a dryer with a very high ses for drinking water abstraction worst the whole system may shut evaporation performance with a dryer, which safely avoids the forma-tion of crusts. This reduces the designsize and improves the operational re-liability.
CFT for salt drying Environmental Protection Worldwide:
Sludge Drying Process
Municipal sludge is increasingly ap- These are typical applications, where These advantages resulted in moreplied as valuable product, as the di- the Buss-SMS-Canzler drying process than 100 sludge drying installationsrect agricultural use will be more can show its advantages with an eva- worldwide, with some being in ope-restrictive in the future. Industrial slud- poration performance between 0.2 ration for more than 25 years.
ges have to be incinerated in most and 8 tons of water per hour. The thincases, so that the pre-drying or full film dryer is characterized by:drying of sludges from municipal as • Single pass operation over the well as industrial plants is a manda- sticky or pasty phase; hence tory process step in many cases. The no back mixing of dried product following drying degrees can be clas- • Low energy consumptionsified: • Self-cleaning heat exchange surface• Self-inertisation by evaporated • 35 to 50% dry solid content prior • Low operating and maintenance to incineration in fluidized bed Transport of sludge dryer • 65 to 75% dry solid content prior to composting or incineration with garbage Full drying to 85 to 95%
dry solid content
• prior to using as solid fuel for
cement kilns or coal fired power stations, for pyrolisis, gasification or other conversion processes • prior to composting, agricultural use and soil reclamation Sludge dryer with pulled rotor Sludge drying plant in USA TDI Recovery:
CFT Dryer for Economic Processes
Toluolene-2, 4-diisocyanate is the However, the realization of this reco- In the CFT dryer with its mechanicallybasis for a large variety of products very process is a demanding applica- agitated fluid bed the wet product islike glue, soft foams for upholstery tion. As soon as the content of free TDI evenly dispersed so that materials,and mattresses, shoe soles, varnishes in the residue reduces to approx. which pass viscous, pasty, sticky, crustfor the automotive industry, planes 17%, the concentrated residue beco- forming or crystallizing phases duringand trains. 90% of the worldwide pro- mes highly viscous and sticky and sud- drying, can be processed. The opera-duction of TDI is used in the pro- denly solidifies. Therefore a processor ting principle of the CFT dryer offersduction of polyurethane, a foamed used for the TDI recovery must avoid a simple and economic treatment ofsynthetics used in many applications. the blocking of the system with solids. the TDI residue, which could be de-During the TDI production process a Fluidized bed dryers, which disperse monstrated in our pilot test centre inlarge amount of distillation residue, the residue into the fluid bed or con- Pratteln, Switzerland. The treated re-which contains 30 to 70% free TDI, is tact dryers in robust design with high sidue was continuously dis- chargedgenerated. Therefore it is crucial for drive torque for the conveying ele- by gravitation into a cooler. The over-the overall profitability of the TDI pro- ments are possible solutions, but result all mass balance confirms – 100%duction process to recover the TDI in high operating and/or investment TDI recovery.
from this residue. As the TDI recovery costs. Therefore Buss-SMS-Canzleris a comparably complex process GmbH developed the TDI recovery instep, different processes have been the Combi Fluidization Technologydeveloped for the TDI recovery: (CFT) dryer.
• Chemical/physical separation with liquid-liquid extraction • Chemical transformation with reaction to toluene diamine • Thermal separation by evaporation The thermal separation by evapora-tion including drying allows a 100%recovery of the TDI from the residueand therefore is accepted as state-of-the-art technology.
Final product TDI recovery process Drying of Terephthalic Acid:
ROVACTOR® in Long-term Failure Free
Operation
Terephthalic acid is the feed product transparent, free flowing powder. Thisfor the manufacturing of PET, which is drying application is very demandingused in large quantities to produce for the process equipment, due to re-bottles, foils and textile fibres. The an- latively high process temperatures bet-nual production worldwide is more ween 180°C and 200°C and thethan 40 million tons of PET, produced large size of the processors. The highfrom the monomers ethylene glycol mechanical strain causes fatigueand terephthalic acid. This shows the cracks in the welding seams, whichimportance of PET as a material, are one of the main reasons for ope-which is used in large quantities for rational malfunctions. Based on a de- Rotor for terephthalic acid dryermany different applications.
tailed analysis of the causes for thedamages on terephthalic acid dryers, For the industrial production of tereph- Buss-SMS-Canzler adjusted the designthalic acid various processes have of its segmented disc dryer RO-been established. The different pro- VACTOR®, so that the welding seamscesses have in common that the reac- can permanently cope with suchtion to produce the terephthalic acid strain. As a result our dryers haveis realized in a solution, which means been in continuous operation for al-the terephthalic acid needs to be most ten years without any damage.
dried to obtain the final product, a Transport of ROVACTOR® for drying terephthalic acid
Pharmaceutical Industry:
CONTIVAC for Unchanged Product Quality
The CONTIVAC NDP processor was Batch operated dryers have problems developed by Buss-SMS-Canzler for with products, which pass through a sti- • Combination of different basic use in production processes with spe- cky, viscous phase during drying.
operations in one machine (no transport cial hygienic requirements. This proces- Such cases require very long residence problems, no contamination of product) sor combines the advantages of con- • Very short residence time times, which can cause unwanted side- tinuous thin film drying with a special (minimum thermal damage to product, reactions, thermal damage to the pro- high flow rates) rotating spray nozzle that al ows for duct, and/or colour changes. • Very low hold-up CIP cleaning. The individual y adjusta- Experience has proven that the resi- (little waste with product changes) ble heating and cooling zones in the dence time in the CONTIVAC NDP pro- thin film dryer open up new opportuni- cessor can be reduced up to 500 times.
ties for thin film drying technology to be Further advantages compared to batch used in complex processes.
systems result from the low investment The basic operations of mixing, re- and operating costs.
acting, flashing and drying can be car- • Pharmaceutical intermediates The design of the CONTIVAC NDP pro- ried out in the same machine, with cessor complies with the relevant GMP several different substance streams being fed into the processor simultane- Shaft sealing and bearings are con- structed compatible with pharmaceuti- The CONTIVAC NDP processor offers cal requirements (e.g. cartridge con- manufacturers in the pharmaceutical, fine chemical industries and in the foodand pet food industries new possibili-ties for improvement, which are notavailable with conventional batch ma-chines.
Rotor detail Assembly of CONTIVAC Low Risk Investment Decision:
Your test centre for new developments
Pilot tests are the best way
We make the process, instrumenta- We operate worldwide and are to find the right investment
tion and control design for plant sta- active in the most important markets.
ges and individual components as Your local contacts guarantee the fast In Pratteln, Switzerland, we operate well as the machine design for the handling of your inquiry and arrange a well equipped pilot plant. Process core components, which are mainly short-term competent advice.
conditions can be easily modified to reach optimized test results. With theparameters from the test results the Complete service quality
process and plant engineering can We take care of the delivery to the start, all under the responsibility of site of destination, the installation or one project manager.
the supervision of the installation on • Physical definition To find a suitable dryer for your ap- site as well as the final inspection.
• Ionic chemical analysis plication the following procedures Our process engineers plan and su- have proven their value: pervise start up, test run, optimization • General examination of drying of your plant as well as training of the behaviour of product operating personnel. We also offer • Liquid determination • Drying tests with small product service and maintenance contracts • Inorganic chemical samples in lab dryers to examine for preventive maintenance.
general feasibility of our dryers Spare parts are available on short • Drying tests in our pilot plants to call and are shipped once they have • Gas-liquid-reaction obtain engineering parameters passed our quality control.
• Chromatography These procedures provide the neces- We offer the automation, optimiza- sary information depending on the tion or modification of our equipment project stage.
and plants throughout their entireoperating life.
Our test report provides our
customers with:
• Documentation of the test • Description of the test results• Analysis of the product samples Professional project realization
from one source
We accompany and consult you from
the product idea to the optimized
quality production. We develop cus-
tomized process solutions for the ther-
mal separation or concentration of
substance mixtures.
entur-nogeaerbw •210 2 Head Office & Workshop
Branch Office & Test Center
Buss-SMS-Canzler GmbH Buss-SMS-Canzler GmbH Buss-SMS-Canzler GmbH Kaiserstraße 13-15 Hohenrainstraße 10 Am Langen Graben 7 CH-4133 Pratteln 1 Phone: +49 60 33 - 85 - 0 Phone: +41 61 82 - 56 - 869 Phone: +49 24 21 - 705 -1 Fax: +49 60 33 - 85 - 249 Fax: +49 24 21 - 705 - 80

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