Tetrasodium iminodisuccinate carries CAS number 144538-83-0. It belongs to the family of biodegradable chelators designed to replace EDTA, DTPA, and NTA. What sets it apart from other green chelators is its strong affinity for copper under acidic conditions and its exceptional stability with hydrogen peroxide.

The Copper Selectivity Advantage

Most chelating agents bind a broad spectrum of metal ions. EDTA grabs calcium, magnesium, iron, copper, and zinc with roughly equal strength. This non-selective approach works in some applications but creates problems in others.

IDS shows a marked preference for copper. At low pH, where many chelators lose their grip on metal ions, IDS maintains strong copper binding. This matters in several industrial processes that operate under acidic conditions.

In pulp bleaching, copper and iron ions catalyse the breakdown of peroxide bleaching agents. IDS selectively ties up these catalytic metals without interfering with other process chemicals. The result is higher bleaching efficiency and brighter pulp.

In textile dyeing, copper and iron traces in process water shift dye colours. IDS complexes these metals and prevents colour distortion. The dyed fabric comes out in the correct shade without the batch-to-batch variation that metal contamination causes.

Hydrogen Peroxide Stabilisation

Hydrogen peroxide (H2O2) is the workhorse bleaching agent in the textile, pulp, and paper industries. It is also inherently unstable. Trace metals, particularly copper and iron, catalyse its decomposition into water and oxygen. This decomposition wastes bleaching agent and produces gas bubbles that interfere with the process.

IDS stabilises hydrogen peroxide by chelating the metal ions that catalyse its breakdown. Unlike some stabilisers that simply slow decomposition, IDS targets the root cause. It binds the catalytic metals so they cannot react with the peroxide molecule. This is where an iminodisuccinate chelating agent outperforms generic stabilisers.

This stabilising effect works especially well under the high-temperature, alkaline conditions typical of peroxide bleaching processes. When IDS is mixed with sodium silicate, it also reduces silica scale formation on equipment. This combination addresses two problems at once: peroxide instability and equipment fouling.

Applications Across Industries

Pulp and Paper Bleaching

The pulp industry relies on hydrogen peroxide for brightening. IDS works as a peroxide stabiliser that complexes catalytic metal ions. It improves brightness values compared to traditional silicate-based stabilisers. It also reduces the silicate deposits that build up in bleaching towers and washing equipment, cutting maintenance downtime.

Textile Dyeing and Finishing

Metal ions in process water interfere with dyes in two ways. First, they form complexes with dye molecules, shifting the colour. Second, they catalyse oxidation of sensitive dye structures. IDS removes both threats by chelating the offending metals. It also functions as a soaping agent in post-dye washes, where it helps remove unfixed dye and improves colour brightness.

Cosmetics and Personal Care

Cosmetic formulations contain unsaturated fatty acids and oils that oxidise in the presence of metal ions. This oxidation causes rancidity, colour changes, and shortened shelf life. IDS chelates the metal catalysts and extends product stability. Its biodegradability profile also appeals to brands marketing natural or clean-beauty formulations.

Industrial and Institutional Cleaning

IDS works with surfactants to clean hard surfaces. In neutral pH cleaners, it removes iron sulphide and rust deposits from metal pipework. Natural gas pipeline cleaning is one specific application where IDS has proven effective. It dissolves iron-based deposits without the corrosion risk associated with acid cleaning.

Read more about hydrogen peroxide bleaching from this Wikipedia overview.

Agricultural Micronutrient Delivery

Trace elements like iron, zinc, copper, and manganese are essential for plant growth. In their free ionic form, these nutrients react with phosphate and other soil components, becoming unavailable to plants. IDS chelates these micronutrients, keeping them soluble and available for root uptake. IDS-chelated calcium, magnesium, zinc, copper, iron, and manganese products are used in foliar sprays, soil applications, and water-soluble fertiliser blends.

Product Specifications

IDS-Na4 is available in two forms. The liquid product is a colourless to pale yellow aqueous solution with 33 per cent minimum active content, 42 per cent minimum solid content, and pH above 7. The solid product is a white powder with 76 per cent minimum active content, 92 per cent minimum solid content, and bulk density of 0.3 kilograms per litre.

Both forms perform the same function. The liquid suits ready-to-use formulations where the water content is acceptable. The powder works well in solid detergent tablets, powder blends, and applications where shipping water adds unnecessary logistics cost.

Standard packaging includes 25-kilogram and 250-kilogram plastic drums for liquid, and kraft paper bags for powder. Store sealed in a cool place. Liquid products should be kept above 5 degrees Celsius to prevent separation.

Test Iminodisuccinate in Your Process

Every application has different demands. For bleaching processes, test peroxide stability at your operating temperature and pH. For dyeing, run colour-fastness trials with your specific dye set. For cleaning, compare descaling performance against your current formulation. For cosmetics, run oxidation stability tests with your oil phase.

Contact the application laboratory for free samples of 200 to 500 grams in liquid or powder form, the full technical data sheet, and safety documentation. Reach the team at [email protected] or call +86-537-3739818 to discuss your specific process requirements.