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[starch]

we are manufacturers of tapioca starch.we presently dry the starch by sun drying. we are planning to install a drier to suit our needs.

wet starch is in the form of cake and tends to decompose at higher temperature.we dont want any decomposition of starch.

initial moisture content in starch is 25% after drying it should max 5%.

please help

[gvdlans]

This is not my area of expertise, but a quick search showed that usually pneumatic dryers (also called flash dryers) are used for this application. The starch is dispersed into an upward flowing stream of hot air by a suitable feeder. The dried starch is subsequently separated from the air stream by a cyclone.
See for example http://www.starch.dk...profile/dry.htm or figure 10.29 in Coulson and Richardson's Chemical Engineering, Volume 6, 2nd edition. Also Perry's Chemical Engineers' Handbook, section on Solids Drying Equipment, has a lot of useful information, drawings etc.

I did a Google search with following keywords "flash dryer" tapioca and got quite a number of interesting looking results...