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OPTIMIZATION OF PIGEONPEA MILLING PROCESS

KrishiKosh

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Title OPTIMIZATION OF PIGEONPEA MILLING PROCESS
M.Sc.
 
Creator INDORE, NAVNATH SAKHARAM
 
Contributor J. P. Sinha
 
Subject husking, milling, pigeonpeas, productivity, grain, grain legumes, sampling, tillage equipment, inorganic acid salts, crop residues
 
Description T-8821
Pigeonpea (Cajanas cajan) is one of the important pulse crops of India,
contributing about 20% to the total production of all pulses. Pulses are also referred
to as a source of “Poor man’s Protein”. The hull of pigeonpea is tightly attached to
the cotyledons via a thin layer of gums, which makes it problematic for milling. The
present research was undertaken to study the milling characteristics of pigeonpea and
to optimize the pre-milling treatment for maximum dal recovery with IARI Mini Dal
Mill. The cleaned and graded lots of pigeonpea c.v P-992 of moisture content 10% ±
0.5 % were subjected to pre-milling treatment. The pre-milling treatments which
were undertaken for the study namely: heat and hydrothermal treatment considering
the conditions of rural area. Experiments were conducted for four levels of
temperature (Temp. 65, 85, 105, 125˚C) and residence time (2, 4, 6, 8 min) in heat
treatment. However, three levels of steam pressure (0.5, 1, 1.5 kg/cm2) and residence
time (5, 10, 15 min) were taken for the study for hydrothermal treatment. Dehulling
was done with emery plate chakki. Under hydrothermal treatment, steam pressure 0.5
kg/cm2 for 10 min yielded maximum hulling efficiency: 84.53 % and finished
product recovery: 52.07 %. However, heat treatment at temperature 85 ± 5˚C for 4
min resulted to the maximum hulling efficiency: 84.28 % and product recovery:
53.53 %. Milling by IARI Mini Dal Mill yielded finished product recovery: 72.83
% and hulling efficiency: 90.47 % with pre-milling heat treatment at 85 °C for 4
minute and hydrothermal treated lot resulted finished product recovery: 74.96% and
milling efficiency: 90.77 %. Further increase of product recovery and dehulling
efficiency was observed with scouring the kernel before treatment. Cost of
processing was found to be 1.25 Rs./kg and 1.60 Rs./kg for heat and hydrothermal
pre-milling treatment and milling by IARI Mini Dal Mill, respectively.
 
Date 2016-06-24T15:22:39Z
2016-06-24T15:22:39Z
2013
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/67978
 
Format application/pdf
 
Publisher IARI,DIVISION OF AGRICULTURAL ENGINEERING,NEW DEHLI