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Process Water Treatment II

Ion Exchange Systems & Products

  • Portables

  • Swift Plus

    Comprises a family of automatic twin-bed deionisers incorporating state-of-the-art counterflow ion exchange technology. Operation cycle of these rapid-regeneration, skid mounted and packaged units are controlled by volume throughout, which is pre-programmed into the PLC according to the type of feed water. The ion exchange resins are never fully exhausted ensuring optimum deionised water production at all times. Regeneration of cation and anion beds is simultaneous hence, effluent streams are largely self-neutralising, reducing waste disposal costs and environmental impact.

  • Layered Bed

  • Conventional

The dealkalisation process reduces the alkalinity in water. Along with alkalinity, it also reduces hardness and sodium associated with alkalinity. These reductions reflect in the content drop of dissolved minerals in water.

The condensate polishing unit removes 'crud' - mostly consisting of sodium, chloride, silica and carbon dioxide. Condensate polishing units are typically installed for super thermal power stations with the main objective of improving the boiler water quality. The benefits of condensate polishing are quicker start up and as a result full load conditions are reached early giving economic benefits. Orderly shutdown is possible in the case of condenser tube leak conditions.


The growing demand for ultrapure water by industries has paved way for systems that deliver superior quality water products. The EDI system is an effective design combining two well established and proven water purification technologies - electrodialysis and ion exchange resin deionisation. In other words, EDI is a continuous process for producing high purity water using ion exchange membranes, resins and electricity.

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We offer a complete range of INDION gel, isoporous and macroporous as well as cation and anion exchange resins for water and waste water treatment and a host of speciality applications – pharmaceutical excipients, food, catalytic, and nuclear grade resins, chelating resins for brine softening, resins for sugar purification and many more.

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  • Industrial Water Treatment

    INDION ion exchange resins used for conventional water treatment applications such as softening, deionisation and dealkalisation are manufactured in an automated ISO 9001 & 14001 certified facility. Lower rinse volumes, high capacity, superior life pattern and proven track record make INDION resins a preferred choice.

  • Potable Water Treatment

    We manufacture a variety of high purity ion exchange resins designed for the purification of potable water. These resins have very low organic impurities. The applications include softening, water disinfection and nitrate/arsenic/fluoride/iron removal.

  • Nuclear Grade Resins

    INDION nuclear grade resins have been developed after intensive research and have exceptionally high bead strength, low levels of metal, chloride and organic impurities. The resins are used for a number of applications in the nuclear power industry.

    • Applications

  • Catalyst Grade Resins

    INDION catalyst grade resins have superior particle integrity, high surface area, controlled porosity and lower moisture content. These unique properties make them an excellent choice as catalyst in a variety of chemical reactions.

  • Hydrometallurgy

    We manufacture various grades of chelating resins, strong and weak acid cation exchange resins for removing or recovering metal ions. The chelating resins having aminophosphonic, iminodiacetate, thiol and thiouronium functional groups are used for removing specific ions from a mixture of ions.

    • Applications

  • Food & Beverage

  • Sugar Decolourisation

    The ion exchange speciality INDION resins for decolourisation of sugar melt has synergistic effect with phosflotation and carbonation. It operates by passsing the pretreated sugar melt through a combination of speciality ion exchange resin columns.

  • Chemical & Special Process

    We have been catering to the needs of customers in India and abroad for various process applications such as deashing, colour removal, deacidification, decalcification of secondary brine, etc. INDION resins used in these applications have superior thermal and oxidative stability, excellent operating capacity and good bead strength.

    • Applications

  • biodiesel

  • Pharmaceutical Grade Resins

    The applications include taste masking, sustained release, tablet disintegration, drug stabilisation, treatment of Hyperkalaemia, etc. Some of the resins have been specifically developed for taste masking of high molecular weight drugs, like Azithromycin.

    • Applications

  • Aloe Vera Purification

    The ion exchange process is effectively used in the purification of aloe vera juice. Reduction of bitterness, polyphenols and aloin has been successfully done with our INDION adsorbent resin. The resin can be recharged and reused for a number of life cycles, hence the process is economical.

  • MEG Purification

  • N-Methyl Pyrolidone Purification

    N-Methyl 2 Pyrolidene (NMP) is a kind of organic compound and a colourless high boiling liquid. It is used as a medium for chemical reactions and as an industrial solvent. It is completely miscible with water, ether, alcohols, esters, ketones and chlorinated and aromatic hydrocarbons.

  • Fluoride Removal from Aluminium Industry

    Fluoride is a fairly common element, representing about 0.3 kg of Earth's crust. Much of the flouride enters biotic system through water but food, air and industrial exposure are also very important routes. Flouride forms insoluble salts with calcium, barium, strontium and lead and is a common substitute for hydroxyl group.

  • Recovery of Tartaric Acid

  • Deashing of Dextrose

    Presently the sugar juices and syrups are being softened (calcium removal), decolourised, deionised by means of ion exchange.

    Powdered activated carbon treatment before the processing of liquefied starch is carried out in the purification starch hydrolysate. This practice is beneficial in removing resin foulants thereby extending ion exchange resin life.

    The ion exchange system comprises of strong acid cation exchange resin and weak base anion exchange resin units. The process for the removal of the dissolved mineral impurities (ash) by ion exchange resins can be generalised as follows:
    Ion exchange process involves two stages of demineralisation.

    The first stage involves the removal of cationic impurities (decationisation) with the help of strong acid cation exchange resin.

    The second stage is removal of the anionic counterparts using weakly basic macroporous resin.

  • Gelatine Deashing

    These various grades of gelatine have applications in food, pharmaceuticals and photographic productions. Ion exchange process involves two stages of demineralisation for the removal of ash. The first stage is the removal of cationic impurities by the cation exchange process. The second stage is the removal of anions from the gelatine solution.

  • Conversion of Sodium Gluconate to Gluconic Acid

    The large scale production of gluconic acid from sodium gluconate is only possible by making use of ion exchange resin technology. The strong acid cation resin is used for converting sodium gluconate to gluconic acid. The product obtained after ion exchange column is in equivalance with sodium gluconate. The whole process of conversion becomes easy, trouble free and commercially viable.

  • Sugar Decolourisation

    Ion exchange sugar refining process is designed to decolourise sugar remelt after pretreatment methods like phosflotation or carbonation. It operates by passing the pretreated sugar melt through a combination of specially suited ion exchange resin columns. These resins have the capacity to absorb the colour precursors. The exhausted resin bed can be effectively regenerated using sodium chloride salt solution. On crystallisation the final colour of the sugar is in the range of 20 – 40 ICUMSA.

  • Biodiesel Purification & FFA Esterification

    Our ion exchange resin in esterification of FFA gives numerous advantages:
    • Conversion of FFA (>1% - < 5%) into fatty acid methyl ester or biodiesel and subsequent triglyceride transesterification into biodiesel increases the process yield by 5%
    • Complete conversion of FFA (> 85%) into biodiesel increases the process yield while eliminating the use of sulphuric acid. Other advantages are improved phase separation and reduction of organic waste in waste water. The ion exchange process for purification of raw biodiesel by removal of glycerine, soap, moisture etc. results in
    • Reduction of waste water (nearly zero emission)
    • No liquid/liquid phase separation/no centrifuges
    • Less water in biodiesel to be removed in the drying step
    • High purity of the end product. Further, if raw biodiesel contains residual low FFA content of 0.5 – 1.0%, this can be reduced using ion exchange resin to < 0.1%, ensuring compliance to ASTM standard.

  • Brine Softening for Chloralkali Industry

    Membrane cell technology is expected to find increasing use in future chlorine-caustic plants. Purification of the NaCl brine prior to electrolysis in these cells requires hardness removal to be below 200 ppb. Chelating ion exchange resins have proved effective for calcium and magnesium removal in this application. By reducing Ca and Mg in the brine to acceptable limits, our resin serves as an effective insurance against the fouling of expensive membrane cells.

  • Conversion of Sodium Silicate to Silica Solution

    Sodium silicate is passed through the strong acid cation exchanger which converts the salt to silicic acid; which then polymerises in the acid environment

  • Formaldehyde Purification

    Strong acid cation exchange resins followed by the weak base anion exchange resins are used in the formaldehyde purification for the removal of sodium and formic acid. These impurities are formed during the manufacturing process of formaldehyde.

  • Glue Deashing

    Glue is obtained by the hydrolysis of collagen. It is usually a more diverse, impure mixture of lower molecular weight and is often considered as containing gelatin. The cationic and anionic impurities are removed by using cation and anion exchange resins, followed by mixed bed unit if required for the higher purity purpose.

  • Glycerol Purification

    Ion exchange is used commercially for the production of refined glycerin from crude glycerin solutions. Both deionization and colour removal are important. The choice of ion exchange resins and systems will vary, depending upon the composition of the crude glycerin solution and the nature of the impurities to be removed. A strong acidic cation exchanger followed by a weak basic anion exchanger is used to remove the major impurities.

  • Glycol Purification

    A mixture of Mono Ethylene Glycol (MEG), Diethlyene Glycol (DEG) and Tri-ethylene glycol (TEG) is produced during the manufacturing of MEG. This crude glycol contains certain salts as impurities; hence demineralisation of the crude glycol is necessary prior to its distillation to separate MEG, DEG and TEG. A strong cation exchanger such as INDION 525 and weak base exchanger such as INDION 850 has been applied for this application. Also, use of SBA is recommended for the pH correction.

  • Glyoxal Purification

    A typical batch composition of crude glyoxal solution after controlled oxidation will have strong and weak acids as impurities. These impurities are removed by using weak base anion exchanger followed by strong acid cation exchanger.

  • Hydrochloric Acid Purification

    One of the earlier, rather unique, applications for metal ion removal is that of iron removal from concentrated hydrochloric acid. In concentrated hydrochloric acid, iron is known to be present as an anionic chloride complex, and strong base anionic resins have been used successfully to remove this complex. Since at low chloride concentration the anionic complex does not exist, the iron can be eluted from the resin by rinsing the bed with water.

  • Iron Removal from Chromic Acid

    Strong acid cation exchange resin in packed bed form has been used for the removal of heavy metal, viz., iron from the solution of chromic acid.

  • Mercury Removal from Chloralkali Industry

    In an ion exchange process, mercury from the waste water is removed by an ion exchange resin. The ion exchange resin should have strong polishing power in order to reduce mercury in the treated effluent down to a few ppbs. The performance should not be seriously influenced by fluctuations in pH, temperature and concentration of SO4, ClO3 and Cl ions. Further, in order to avoid secondary waste problems, it should be possible to regenerate the resin with a liquid that can be reintroduced into the eletrolysis process. The resin should be very specific for mercury in order to avoid introduction of impurities, which are detrimental to electrolysis process while recycling the regeneration solution with mercury.

  • Nickel Removal from Electroplating Industry

    Waste water containing soluble nickel, after pretreatment, can be recovered by using a cation exchange resin. The use of ion exchange resin has an advantage for removing only metallic constituents from waste water. Thus the outlet water can be reused or it can be used/discharged after treatment. Nickel which is on the resin can be eluted with sulphuric acid of about 10-20% solution and the nickel concentrate in the range of 50-100 mg/l can be obtained. Nickel is thus recovered as nickel sulfate and reused to load the plating baths.

  • Sorbitol Deashing

    The presence of nickel in sorbitol, obtained from contact with Raney nickel catalyst, has been found objectionable for subsequent synthesis of ascorbic acid. Removal of nickel by a strongly acidic cation exchanger in the hydrogen form has proven successful in several commercial installations. An anion exchange resin is used to remove the sulfuric acid and colour which are also found in this product.

  • Recovery of Vitamin C

  • Recovery of Zinc from Rayon Spin Bath

  • Chromic Acid Recovery

  • Recovery of Streptimycin

  • Purification of Glycerine

    Ion exchange is used commercially for the production of refined glycerin from crude glycerin solutions. Both deionisation and colour removal are important. The choice of ion exchange resins and systems will vary depending upon the composition of the crude glycerin solution and the nature of the impurities to be removed. A strong acidic cation exchanger followed by a weak basic anion exchanger is used to remove the major impurities.

  • Colour Removal from Textile Waste