PROCESSING OF GUAR

Dr. S. Purkayastha

PROCESS FLOW DIAGRAM  GUAR PLANT  

  GUAR PODS   

GUAR SEED   

GUAR HULL ENDOSPERM GUAR KERNEL (MEAL) (SPLIT) (KORMA)    

FOOD GRADE 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.

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FLOW DIAGRAM OF GUAR SPLITTING UNIT 

Guar Seed

Seed Cleaning Equipments (Vibro seiver, dust remover)

Seed Splitting Equipment

Clean, sorted seed Dust, stem and other foreign particles

Seivers

Seivers

Undehusked Split

Heating tube

Dehusking Machines

Seivers

Churi dustDehusked Split

Polisher

Cooling

Silo

Packing

Churi, korma

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 and Healthcare

Dairy and frozen foods, bakery products, sauces 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

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.

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.

PROCESSING OF GUAR FOR PAPER INDUSTRY:

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 PRINTING THICKENERS FROM GUAR GUM :

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