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- Spray_drying abstract "Spray drying is a method of producing a dry powder from a liquid or slurry by rapidly drying with a hot gas. This is the preferred method of drying of many thermally-sensitive materials such as foods and pharmaceuticals. A consistent particle size distribution is a reason for spray drying some industrial products such as catalysts. Air is the heated drying medium; however, if the liquid is a flammable solvent such as ethanol or the product is oxygen-sensitive then nitrogen is used.All spray dryers use some type of atomizer or spray nozzle to disperse the liquid or slurry into a controlled drop size spray. The most common of these are rotary disks and single-fluid high pressure swirl nozzles. Atomizer wheels are known to provide broader particle size distribution, but both methods allow for consistent distribution of particle size. Alternatively, for some applications two-fluid or ultrasonic nozzles are used. Depending on the process needs, drop sizes from 10 to 500 µm can be achieved with the appropriate choices. The most common applications are in the 100 to 200 µm diameter range. The dry powder is often free-flowing.The most common type of spray dryers are called single effect. There is a single source of drying air at the top of the chamber (see n°4 on the diagram). In most cases the air is blown in the same direction as the sprayed liquid (co-current). A fine powder is produced, but it can have poor flow and produce a lot of dust. To overcome the dust and poor flow of the powder, a new generation of spray dryers called multiple effect spray dryers have been produced. Instead of drying the liquid in one stage, drying is done through two steps: the first at the top (as per single effect) and the second with an integrated static bed at the bottom of the chamber. The bed provides a humid environment which causes smaller particles to clump, producing more uniform particle sizes, usually within the range of 100 to 300 µm. These powders are free-flowing due to the larger particle size.The fine powders generated by the first stage drying can be recycled in continuous flow either at the top of the chamber (around the sprayed liquid) or at the bottom, inside the integrated fluidized bed.The drying of the powder can be finalized on an external vibrating fluidized bed.The hot drying gas can be passed in as a co-current, same direction as sprayed liquid atomizer, or counter-current, where the hot air flows against the flow from the atomizer. With co-current flow, particles spend less time in the system and the particle separator (typically a cyclone device). With counter-current flow, particles spend more time in the system and is usually paired with a fluidized bed system. Co-current flow generally allows the system to operate more efficiently.Alternatives to spray dryers are:Freeze dryer: a more-expensive batch process for products that degrade in spray drying. Dry product is not free-flowing.Drum dryer: a less-expensive continuous process for low-value products; creates flakes instead of free-flowing powder.Pulse combustion dryer: A less-expensive continuous process that can handle higher viscosities and solids loading than a spray dryer, and that sometimes gives a freeze-dry quality powder that is free-flowing.↑ ↑ ↑ ↑".
- Spray_drying thumbnail Labspraydryer.svg?width=300.
- Spray_drying wikiPageExternalLink books?id=CYELHT3DQuEC&pg=PP1.
- Spray_drying wikiPageExternalLink All-downloads.654.0.html?&no_cache=1&no_cache=1&file=308&uid=880.
- Spray_drying wikiPageExternalLink SD-e.htm.
- Spray_drying wikiPageID "145023".
- Spray_drying wikiPageLength "10620".
- Spray_drying wikiPageOutDegree "34".
- Spray_drying wikiPageRevisionID "707465906".
- Spray_drying wikiPageWikiLink Amphiphile.
- Spray_drying wikiPageWikiLink Atomizer_nozzle.
- Spray_drying wikiPageWikiLink Category:Drying.
- Spray_drying wikiPageWikiLink Category:Flavor_technology.
- Spray_drying wikiPageWikiLink Category:Food_industry.
- Spray_drying wikiPageWikiLink Category:Industrial_processes.
- Spray_drying wikiPageWikiLink Category:Pharmaceutical_industry.
- Spray_drying wikiPageWikiLink Drink_mix.
- Spray_drying wikiPageWikiLink Drum_drying.
- Spray_drying wikiPageWikiLink Ethanol.
- Spray_drying wikiPageWikiLink Fluidized_bed.
- Spray_drying wikiPageWikiLink Freeze-drying.
- Spray_drying wikiPageWikiLink Fugacity.
- Spray_drying wikiPageWikiLink Homogenization_(chemistry).
- Spray_drying wikiPageWikiLink Hydrophile.
- Spray_drying wikiPageWikiLink Hydrophobe.
- Spray_drying wikiPageWikiLink Micelle.
- Spray_drying wikiPageWikiLink Micro-encapsulation.
- Spray_drying wikiPageWikiLink Micrometre.
- Spray_drying wikiPageWikiLink Modified_starch.
- Spray_drying wikiPageWikiLink Nano_spray_dryer.
- Spray_drying wikiPageWikiLink Nitrogen.
- Spray_drying wikiPageWikiLink Osmosis.
- Spray_drying wikiPageWikiLink Pharmaceutical_drug.
- Spray_drying wikiPageWikiLink Powdered_milk.
- Spray_drying wikiPageWikiLink Spray_nozzle.
- Spray_drying wikiPageWikiLink Surface_tension.
- Spray_drying wikiPageWikiLink Suspension_(chemistry).
- Spray_drying wikiPageWikiLink Thermal_decomposition.
- Spray_drying wikiPageWikiLink Ultrasonic_nozzle.
- Spray_drying wikiPageWikiLink Water.
- Spray_drying wikiPageWikiLink File:Labspraydryer.svg.
- Spray_drying wikiPageWikiLink File:SDXFamily1.JPG.
- Spray_drying wikiPageWikiLink File:Spray_Dryer.gif.
- Spray_drying wikiPageWikiLinkText "Spray drying".
- Spray_drying wikiPageWikiLinkText "Spray-dry".
- Spray_drying wikiPageWikiLinkText "Spray-drying".
- Spray_drying wikiPageWikiLinkText "Spray_drying".
- Spray_drying wikiPageWikiLinkText "spray dried".
- Spray_drying wikiPageWikiLinkText "spray drier".
- Spray_drying wikiPageWikiLinkText "spray dryer".
- Spray_drying wikiPageWikiLinkText "spray dryers".
- Spray_drying wikiPageWikiLinkText "spray drying".
- Spray_drying wikiPageWikiLinkText "spray".
- Spray_drying wikiPageWikiLinkText "spray-dried".
- Spray_drying wikiPageUsesTemplate Template:Citation_needed.
- Spray_drying wikiPageUsesTemplate Template:Cite_book.
- Spray_drying wikiPageUsesTemplate Template:Reflist.
- Spray_drying subject Category:Drying.
- Spray_drying subject Category:Flavor_technology.
- Spray_drying subject Category:Food_industry.
- Spray_drying subject Category:Industrial_processes.
- Spray_drying subject Category:Pharmaceutical_industry.
- Spray_drying hypernym Method.
- Spray_drying type Software.
- Spray_drying type Industry.
- Spray_drying type Pharmaceutic.
- Spray_drying type Process.
- Spray_drying type Redirect.
- Spray_drying type Science.
- Spray_drying comment "Spray drying is a method of producing a dry powder from a liquid or slurry by rapidly drying with a hot gas. This is the preferred method of drying of many thermally-sensitive materials such as foods and pharmaceuticals. A consistent particle size distribution is a reason for spray drying some industrial products such as catalysts.".
- Spray_drying label "Spray drying".
- Spray_drying sameAs Q1066303.
- Spray_drying sameAs تجفيف_بالرذاذ.
- Spray_drying sameAs Sprejové_sušení.
- Spray_drying sameAs Sprühtrocknung.
- Spray_drying sameAs Sumukuivaus.
- Spray_drying sameAs Atomisation_(agroalimentaire).
- Spray_drying sameAs ייבוש_בריסוס.
- Spray_drying sameAs Porlasztva_szárítás.
- Spray_drying sameAs Atomizzatore.
- Spray_drying sameAs 噴霧乾燥.
- Spray_drying sameAs Sproeidrogen.
- Spray_drying sameAs Suszenie_rozpyłowe.
- Spray_drying sameAs m.012dkv.
- Spray_drying sameAs Spraytorkning.
- Spray_drying sameAs Q1066303.
- Spray_drying wasDerivedFrom Spray_drying?oldid=707465906.
- Spray_drying depiction Labspraydryer.svg.
- Spray_drying isPrimaryTopicOf Spray_drying.