Three-Stage Spray Drying: New Process Involving Instant Controlled Pressure Drop

The goal of this article is to define a new industrial operation called three-stage spray drying that can increase the specific surface area of powder while reducing the amount of fine dust. Because of their compact structure, spray-dried granules have an exchange surface limited to their surface ar...

Full description

Saved in:
Bibliographic Details
Published in:Drying technology 2008-03, Vol.26 (4), p.452-463
Main Authors: Mounir, Sabah, Allaf, Karim
Format: Article
Language:English
Subjects:
DIC
Size particle distribution
Specific surface area
Spray drying
Texture
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The goal of this article is to define a new industrial operation called three-stage spray drying that can increase the specific surface area of powder while reducing the amount of fine dust. Because of their compact structure, spray-dried granules have an exchange surface limited to their surface area. We performed experiments inserting the instant controlled pressure drop (DIC®) treatment between the atomization (first stage of spray drying) and the final drying stage. As a high-temperature, short time (HTST) process, DIC treatment expanded granule texture at a rate depending on pore distribution, mesopore volume, and the mean porosity thus generated; the cumulative specific surface area thus induced evolved as a function of the DIC treatment conditions: the higher the DIC steam pressure, the higher the expansion rate. Both specific surface area and mean particle diameter may then simultaneously increase. Technological properties were investigated in order to compare DIC textured powders and conventional spray-dried powders and optimize the treatment; such an optimization can include the rate of decontamination thus generated.
ISSN:0737-3937
1532-2300
DOI:10.1080/07373930801929334