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Pneumatic separation of hulls and meats from cracked soybeans

Paper ID Volume ID Publish Year Pages File Format Full-Text
19421 43064 2009 10 PDF Available
Title
Pneumatic separation of hulls and meats from cracked soybeans
Abstract

The dehulling process of cracked soybeans was experimentally investigated in this work. The mean Sauter diameter (dv,s) of as-received material was 2.70 mm, with an average proportion of 95% meats and 5% hulls for a moisture content of 11.8%. The true densities of hulls and meats were 1090 and 1267 kg/m3, with dv,s of 2.11 and 2.74 mm, respectively. Hulls were mostly elutriated around 2.7–4.5 m/s and meats around 9.1–13.7 m/s. The overlap of terminal velocity profiles required a combination of pneumatic and sieving operations for optimized separation. The influence of particle concentration on continuous dehulling was investigated for three solid-to-air ratios (W/Q  ). The procedure that maximized particle separation was a sequence of pneumatic dehulling with vs=7.4–9.1 m/svs=7.4–9.1 m/s and W/Q = 1.05 kgsolids/m3air, followed by screening of lifted material with sieve ASTM no. 6 and a final pneumatic separation of small hulls and meats at vs=3.9−4.1 m/svs=3.9−4.1 m/s. An industrial scale pneumatic dehuller was built and tested for W = 6973 kg/h, vs=7.6–8.2 m/svs=7.6–8.2 m/s and W/Q = 0.97 kgsolids/m3air. The efficiency of the pneumatic device to remove hulls from the cracked soybean was very high, with the recovery of meats with purity around 99%.

Keywords
Soybean; Hulls; Pneumatic dehulling; Terminal velocity; Elutriation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Food and Bioproducts Processing - Volume 87, Issue 4, December 2009, Pages 237–246
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us