Transcript Dr. Shyamal Purkayastha–President, Indian

PROCESSING OF GUAR
Dr. S. Purkayastha
PROCESS FLOW DIAGRAM
GUAR PLANT
GUAR PODS
GUAR SEED
GUAR HULL
(MEAL)
FOOD GRADE
ENDOSPERM
(SPLIT)
GUAR KERNEL
(KORMA)
INDUSTRIAL GRADE
GUAR CROP
 Drought tolerant legume primarily grown in Haryana, Rajasthan
& North Gujarat.
 Its beans are used as vegetables for humans in Asia and gaur
gum is used as a stiffener in soft ice cream, as stabilizer for
cheeses, instant pudding , whipped cream substitutes ,enhance
the oil recovery & used as binder/thickener in textile industry.
•
FLOW DIAGRAM OF GUAR SPLITTING UNIT
Guar Seed
Seed Cleaning Equipments
(Vibro seiver, dust remover)
Clean, sorted seed
Dust, stem and other foreign particles
Seed Splitting Equipment
Seivers
Seivers
Churi, korma
Undehusked Split
Heating tube
Dehusking Machines
Seivers
Dehusked Split
Polisher
Cooling
Silo
Packing
Churi dust
Guar is one of the polysaccharide with highest molecular weights of all
naturally occurring water soluble polymers. Recent studies with low
angle laser light scattering as well as size exclusion chromatography
indicate the average molecular weight to be in the range of 1000,000 –
2000,000.
INDUSTRY-WISE APPLICATIONS
INDUSTRY
APPLICATIONS
Food Processing Dairy and frozen foods, bakery products, sauces
and Healthcare
and salad dressings, beverages, canned food,
special dietetics and diabetic diets, soluble fibre
and various clinical nutrition recipes
Oil and Gas
Viscofier in fracturing operation in oil field (FHG,
HPG and CMHPG)
Textile
Thickeners for textile, fabric and carpet printing as
well as textile sizing and crisp finishing of clothes
Mining
Coal mining and coal slurry flowing aid, ores
concentration, flocculation and better recovery, as
gelling agent in aqueous stick explosives
Paper
Wet and dry end additives to improve strength and
burst factor, reducing drainage of fines
Building and Paint
Binding, setting and cement plaster
Pharmaceuticals
Tablet binding, viscosifying syrups, disintegrating
aids, suspending agents
PROCESSING OF GUAR FOR FOOD INDUSTRY
Important properties on food grade guar:
 PARTICLE SIZE: Product should be well
dispersed to produce uniform paste
 VISCOSITY: Viscosity of paste should remain
stable preferably more than 48hrs
 MICROBIOLOGICAL PROFILE: Must qualify the
International Standards
 Guar particle should be globular in shape, must undergo
thermo mechanical process, use of sterile water for
conditioning in order to avoid bacterial contamination,
continuous processing instead of batch-wise process,
proper pH adjustment. The product should be processed
under low shear.
 Usually guar is used in conjugation with other thickeners to
achieve the desired result on finished product. Hence
products with different range of viscosity from 50 cps to
6500cps are being used based on its application.
 The pseudo plastic behavior of guar can be modified by
controlled knocking off galactose unit from the
galactomannan guar. This change alters the suspending
properties of guar.
PROCESSING
INDUSTRY:
OF
GUAR
FOR
PAPER
While producing guar for paper application as wet end additives,
the main emphasis is to be given to make the product application
friendly. In order to achieve desired product one can control the
particle size. A little twist on pH may alter the hydration rate. Guar
in conjugation with starch shows better performance.
PROCESSING
OF
TEXTILE
THICKENERS FROM GUAR GUM :
PRINTING
 Raw material selection: It can be produced from either
highly purified guar split ( 98/99% DH splits) or preferably
300mesh Guar Gum Powder having good filterability thru
240# (63 micron ).
 All input materials such as chemicals in solution form are to
be filtered.
 Temp. & time of reaction is to be properly monitored.
 Premixing of chemicals with guar powder is also important
in order to obtain uniform substitution/ degradation.
 Granularity is also an important factor to be taken care of
FLOW DIAGRAM FOR PROCESSING OF FAST HYDRATING GUAR
PROCESSING PARAMETERS OF FAST HYDRATING
GUAR:
 Quality of raw material
 Processing technique
 Cleaning & Conditioning of splits
 Shearing force applied to separate guar molecules from each
other without reducing its molecular weight. (roll size,
shearing force, addback, regrinding etc)
 Grinding equipments
 Drying conditions
 Particle distribution
PROCESSING FAST HYDRATING HIGH VISCOSITY
DERIVATISED GUAR:
 Quality of split
 Reactor design
 Extensive washing of reacted splits
 Flaking of the washed splits
 Uniformity of reaction from batch to batch